From the main menu bar, select WeatherElement->MatrixLoad.

1. Using the Sources menu, select Fcst
2. Using the Element Name menu, select T, Td, Wind, and Wx. Note that all of the combinations of Fcst and the weather elements you selected now appear in the lower portion of the dialog.
3. Select Load (in the lower left corner.)

Note that the combination of sources (databases) and weather elements listed in the lower portion of the dialog were loaded and are now available for viewing and editing in the GFE.

Repeat this operation, but this time deselect Wind and Wx in the lower portion of the dialog by clicking with MB1. Note that when parameters are deselected, they are UNLOADED from the GFE.

Continue to load and unload more parameters until you understand how this dialog behaves and how it affects the set of parameters available for viewing and editing in the GFE.

Press and drag MB2 over any time period of your choice inside one of the weather element panes of the Grid Manager.

As you drag the mouse cursor you should see blue hatched shading appear inside the weather element pane. This is how you identify a time period/weather element to which you will later apply an edit operation. Later, you will encounter exercises that show you how this selected time period/weather element is used in Grid Manager edit operations.

You can also identify a time period in a slightly different way using the Time Scale (located just below the Grid Manager). After identifying a time period in the Time Scale, MB1 click in the small box located in the upper-left of each Grid manager pane. Note that the time period for that pane now becomes selected. Using this method, you can select the same time period for many different weather elements. The main menu bar function Edit->Deselect All will deselect all time periods and weather elements.

Select a time period and one or more weather elements using the technique described in Exercise 11.2.2 above.

1. Select from the main menu Bar: Edit->Copy From...
2. Select one of the model sources listed in the dialog.
3. Select OK

You should see new grids appear in your forecast. If not, make sure that you have selected a time period that matches at least a portion of the time period of the model you desire and repeat until new grids have been copied into your forecast.

Note that there are gaps in your forecast. Because models provide snapshots of the state of the atmosphere, the system (arbitrarily) assigns a one-hour duration to each grid. Click MB1 on one of the grids in the Grid Manager. The grid should appear in the Spatial Editor.

Using the technique you learned in exercise, select any time period/weather element that contains gaps in the forecast (except Wx).

1. From the main menu bar, select Services->Interpolate->By Gaps.

You should see new grids that appear and fill in the gaps that you identified in step 1. If you visualize these grids in sequence by stepping through them using an MB1 click (or the animator), you will notice that the values at each grid point progressively change in time to provide a smooth transition from one original grid to the next.

Interpolating By Gaps uses all grids in the selected time range to calculate new grids to fill the gaps. The other method of interpolation uses only the grids that you modified to calculate the new grids and replaces those grid you did not modify with interpolated grid. For example, if you edit two of three grids copied from a model, select these grids in the Grid manager and choose Services->Interpolate->Based on Edited Data, new interpolated grids will fill the gaps, the unedited model grid will be replaced by an interpolated grid, and the edited grids will remain unmodified.

Use the Grid Block Size slider to change the Grid Block size to the value 3 or 4 (so you'll be able to more easily perform this operation.)

1. Make sure there is a weather element with at least one grid block and one gap visible.
2. Press the Shift key with one hand and MB1 press over the grid block you wish to copy with the other hand.
3. Still holding the Shift key and MB1 down, drag the selected grid block to a new time period and release MB1.

While you drag the grid block, you should see a white outline that identifies the target time period. When you release MB1, you should see a new grid appear. This grid is identical to the source grid in every way except the time period over which it is valid.

Load T and Td into the GFE (if they are not already). Repeat this exercise using one of the T grids as the source and Td as the destination. Note that as you're dragging the grid block over other weather elements, the white outline does not appear. This means that these weather elements are not eligible as copy destinations because their units are different than the units of T (degrees F).

Make sure the Grid Block Size is set to 3 or 4 as in Exercise 11.1.5.

1. Press and hold MB1 over a grid block that is adjacent to a gap.
2. While holding down MB1, drag the cursor to the left or right until you see the grid block stretch.
3. Release MB1.

As you drag MB1 left and right, you should notice that you are extending the end time of the grid forward in time (right) or extending the start time backwards in time (left). Note that there is no way to shrink a grid block in time.

Repeat this exercise, but this time stretch the grid block into one or more existing grid blocks. Note that any grid blocks that were stretched over other grids (or portions thereof) were deleted from the inventory. This one way to shorten the time over which a grid block is valid. Another way to shorten valid grid times utilizes the Delete function which is discussed in the section titled Delete Grids

Press and hold MB3 over a gap within an editable weather element.

1. Select Create From Scratch.

A new grid should appear over the gap block that you selected. This new grid has the minimum time period allowed for that parameter, but it can always be stretched or moved to a new time period. The value of this grid varies by parameter, but is usually the minimum value allowed (e.g., temperature, value = -50F). Generally the next step is to define the values of the grid points using the Paint tool of the Define Grid tool. These tools will be discussed in some detail later.

Select a time period for any weather element that contains some grid blocks. (See Exercise 11.1.2 for details on selecting time period/weather elements.)

1. From the main menu bar select Edit->Delete.

Note that the grids you identified were removed from that weather element's inventory. Let's try a variation on the previous exercise.

Find a grid block and stretch it until its duration is many hours long.

1. Select a time period that corresponds to a portion of that same time block
2. From the main menu bar select Edit->Delete.

This time, since you only selected a portion of the grid block, only that portion was deleted. This is another way that you can shorten the time period over which a grid is valid.

Find the Data Selector located to the right of the main Spatial Editor Display.

1. Locate one of the grid labels in the lower portion of the Data Selector and MB2 click on the label.

Note that the grid's parameter label jumped to the top list indicating that grid is now active. If the label contains the words <NoData>, there is no grid that corresponds to the time that you previously selected in the Grid Manager. If there is no grid, go to the Grid Manager and Create From Scratch at the time indicated by the dotted yellow line. That will create a new grid and you should see it displayed in the Spatial Editor.

1. Click MB2 over the same (active) grid label again.

You should have noticed that the grid label jumped to the bottom (inactive) list. This exercise illustrates that clicking MB2 on a Data Selector label will toggle the active state for that grid.

•  
• Purpose: Make a grid visible so it can be seen
• References: User Guide - p. 104

The number of parameters in the GFE can be so large that you cannot usefully view them all at once. The Data Selector allows you to easily toggle the visibility of any grid.

Locate one of the grids in the Data Selector and click MB1 on the label.

If the grid was visible, it should be invisible now. If it was previously invisible, you should now be able to see it. This exercise illustrates that clicking MB1 on a Data Selector label will toggle the visible state for that grid.

• Purpose: Display a grid as an image so it can be better visualized
• References: User Guide - p. 101

All gridded data may be viewed as an image, a set of contours or both. By default all grids are displayed as contours only. However, if you want to see a grid as an image, the Data Selector allows you this option.

Make a grid visible in the Spatial Editor.

1. MB1 click on the small box located in the label of that same grid.

If the grid was visible, you should have seen it change from a contour visualization to an image. Also, a legend appeared below the Data Selector illustrating the relationship between color and value, more commonly referred to as the color table.

1. MB1 click on the small image button again.

Note the grid toggled back to the contours only visualization. This exercise illustrates that the small button located in each label toggles the image state of that grid.

In summary, the Data Selector controls the three independent states that any grid may have: active, visible, and image. Clicking MB2 on the label toggles the active state. Clicking MB1 on the label toggles the visible state. Clicking MB1 in the small box inside the label toggles the image state.

Configure the GFE so that a grid is visible and displayed as an image in the Spatial Editor.

1. Move the mouse cursor over the Paint tool and MB1 click to select it.
2. Use Freehand Edit Size slider to set the edit size to 0.5
3. Move the mouse cursor over the legend (located just below the Data Selector) and MB2 click over any value to pick up the paint value.
4. Move the mouse cursor over the Spatial Editor display and MB1 press and drag.

As you're dragging the cursor over the Spatial Editor display, you should see the values of the grid points inside the white box change to the value that you picked up in the legend. For better performance, MB3 button over the grid's label in the Data Selector and select Display Attributes.... When the dialog appears, turn off the box labeled Contour under the Image Visual Type column. Then select OK. That will turn off the contours and give you much better performance.

Play around with the paint tool a bit before you move on to the next tool. Note that clicking MB1 will paint the grid points inside the white edit box as well. Also note that any grid point touching the white edit box will be edited. Change the Freehand Edit Size and try the tool again.

Configure the GFE so that a grid is visible and displayed as an image in the Spatial Editor.

1. Move the cursor over the Freehand Adjust tool located just to the left of the Paint tool and MB1 click to select it.
2. Adjust the Freehand Edit Size to 0.5.
3. Move the Delta slider to someplace near the middle.
4. Move the mouse cursor over the Spatial Editor display, press and hold MB1 and drag.

You should notice that while you drag the cursor across the display, the grid values are increasing by the amount you defined in the Delta slider.

1. Move the cursor over the Spatial Editor again, but this time press and hold MB2 and drag. Try to do this over the same area as in Step 5.

Now the grid values are decreasing as you move the cursor across the spatial display. If you applied the decrement operation exactly over the same area as the increment operation, you should see your original grid with little or no changes.

Use the Freehand Adjust tool again but this time click MB1 instead. Note that all grid points inside and touching the white edit box increase in value. Change the Freehand Edit Size and try the tool again.

Configure the GFE so that a grid is visible and displayed as an image in the Spatial Editor.

1. Move the cursor over the Freehand Smooth tool located just to the right of the Paint tool and MB1 click to select it.
2. Adjust the Freehand Edit Size to 0.5.
3. Move the mouse cursor over the Spatial Editor display, press and hold MB1 and drag.

Note that as you move the cursor across the display the data inside and touching the white edit box are being smoothed. This might be difficult to detect if your data is reasonably smooth already. If you can't tell if the tool is working, select the Paint tool and pick a large value from the legend. Then use the tool to set some grid points to this high value. Reselect the Freehand Smooth tool and apply it to the large gradient that you just created with the paint tool. If the spatial editor is displaying contours along with the image, you should see the contours spread out with each smooth operation.

Pick the Select Points tool by clicking MB1 on the Select Points icon, located in the lower right corner of the Spatial Editor tool palette.

1. Move the cursor over the Spatial Editor display, press and hold MB1 and drag the cursor to form a large circle over your forecast area
2. Release MB1.

When you released the mouse button, you should see a large region filled with small `x's that correspond to your large circle. You have now defined what is called a Reference Set. If you use any of the grid point tools, this is the area that will be modified when you perform the edit operation.

1. With the Select Points tool still selected, press MB2 and drag another circle inside the area you defined in Step 2.
2. Release MB2.

You should now see a donut-shaped area. The Select Points tool allows you to select an area with MB1 drags and deselect an area with MB2 drags.

1. In the controller area, click MB1 on Clear RefSet. This will clear the reference set from the Spatial Editor Display
2. Make sure that the Freehand Edit Size is 0.4 or greater.
3. Move the cursor into the Spatial Editor display, press the SHIFT key, press and hold MB1 and drag. You should see reference set appear instantly and grow as you move the cursor.
4. Release MB1 and repeat Step 8, but this time use MB2 while holding down the shift key. You should be erasing your reference set.

Practice using the Select Points tool. Load a county or zone map and try to make a reference set that defines a single county.

1. Define a reference of your choice using the Select Points tool.
2. Click on the area using MB2.

Your reference set should have been erased. MB2 clicks will erase a reference set region. Try defining several separate areas and delete them individually using MB2 clicks.

Now that you've mastered making reference sets, you're ready for the Grid Point tools.

The six tools found on the middle row of the edit tool palette are Grid Point tools. They all, in general, behave the same way in that you first define an area or areas to edit, select the tool, and apply the operation. How the grid values are modified, of course, is different from tool to tool.

Select the Paint grid point tool (second row).

1. Use MB1 drag operation to define two separate areas for you reference set.
2. Pickup the paint value by clicking with MB2 anywhere in the Spatial Editor display or clicking MB2 somewhere in the legend.
3. Move the cursor over one of the areas of your reference set and click MB1.
4. Pickup an new paint values by repeating Step 3.
5. Move the cursor to the other area and click MB1 to paint it.
6. Pickup another paint value by repeating Step 3.
7. Move the cursor outside of both areas in your reference set and click MB1.

Each time you clicked MB1, you set those grid points to the pickup value. This exercise shows that if the cursor is inside a separate area, only that area will be paint. However if the cursor is not over any selected grid points, all selected points will be assigned the pickup value. All grid point tools behave this way. Notice that as you move your cursor in and out of the separate areas, the areas highlight to let you know what set of grid points are about to be edited.

Select the Adjust tool (second row).

1. Adjust the Delta slider to somewhere near the middle.
2. Use the MB1 drag operation to select several areas for your reference set.
3. Move the cursor over one of the areas and click MB1. See how the values have increased.
4. Click again in the same area with MB2. Note that your previous operation has been nullified.
5. Move the cursor outside all of the areas and click MB1. Note that all of the areas are now greater by the delta amount.

Select the Taper tool (second row).

1. Adjust the Delta slider to somewhere near the middle.
2. Use the MB1 drag operation to select one large area for your reference set.
3. Move the cursor to the left side of your area and click MB1. See how the values have increased. Note also that the grid points near the edge of the area have not been increased as much. This is the only difference between the Adjust and Taper tools. The Taper tool smooths the edges in an attempt to remove the gradient introduced by increasing the grid values.
4. Now move the cursor to the right side of your area and click MB1. Note that the grid points near the cursor were incremented by the delta amount. But the grid points further away from cursor were incremented by a lesser amount.

The Taper and Adjust tools are very similar except that the Adjust tool applies the delta amount uniformly over the entire area, while the Taper tool varies the amount applied to each grid point depending on the distance from the cursor and distance from the edge of the area.

Feel free to repeat the last two exercises until you understand the difference in behavior between the Adjust and Taper tools

Select the Smooth tool (second row).

1. Use the MB1 drag operation to define one or more areas of your reference set. You may want to include some areas that contain a sharp gradient to better illustrate how the Smooth tool works.
2. Click MB1 on any of the areas that you defined.

If any of the areas you selected contained strong gradients, you probably noticed that the gradients were relaxed a bit each time you performed the smooth operation.

Load the Wind weather element into the GFE, find a valid wind grid, and make it visible in the Spatial Editor.

1. Find the Vector edit mode button located just below the delta slider and change the value to Vector: Mag & Dir.
2. Select the Select Points tool and define two separate areas for your reference set.
3. Select the Vector tool.
4. Move the cursor over one of your selected areas.
5. Press and hold MB1 and drag the cursor in any direction. As you do this note how the wind values are changing. As you move further away from the point you pressed, the wind magnitude increases. As you move around the point you pressed, the wind direction changes.
6. While still holding MB1 move the cursor so that the new wind vector is due West at 30 knots (ddff = 2730).
7. Move your cursor over the other selected area, repeat Step 5 and set the value of these to South at 25 knots (ddff = 1825).

You may find the Vector tool a bit awkward at first, but with a little practice you'll be able to define vector values easily and quickly.

Find a feature that you would like to copy.

1. Pick the Select Points tool and make a reference set that identifies your feature.
2. Pick the Move/Copy tool by clicking MB1 on the Move/Copy tool icon.
3. Move the cursor over the selected area, press and hold MB1, drag the feature to some other location, and release the mouse button.

Note that the feature you selected has been copied to a new location. The original feature (at least the part that did not overlap the copied area) was left untouched.

1. Press MB3 anywhere in the Spatial Editor display and select Undo Last Edit.
2. Move the cursor over area that you selected in Step 2.
3. Press and hold MB2, drag the feature to some other location, and release the mouse button.

This time the original selected area did not remain unchanged. When you released MB2, an interpolation algorithm filled in the original area with new values.

Use MB1 when you want to copy an area of data and move it to a new location. Use MB2 if you want to move some feature and fill in the original area with background values.

From the Grid Manager, MB3 press and hold in the temperature (T) pane and select Create From Scratch.

1. Configure your Spatial Editor so that this newly created grid is active and visible as an image. The entire grid should be set to the value -50 F.
2. In the Data Selector, use the MB3 pop-up menu, select Display Attributes, and turn off the contour visual, if it's not already off.
3. Select the Define Grid tool located in the upper row of the edit tool palette.
4. Pickup a paint value from the Spatial Editor legend by clicking MB2 on any value you like.
5. Now move your cursor to the Spatial Editor display, press MB1 and drag. You should notice that you are "painting" new values into your grid.
6. Pickup a new value from the legend and paint another contour. Add a few more contours until there are enough to describe the pattern you're drawing.
7. Press and hold MB3 and select Define New Grid.

After a few seconds you should see a grid appear that conforms to the contours you defined. If you defined just a few contours, it's likely that the algorithm took more than a few seconds and the results were less than desirable. If this is the case, start over and try the tool again from Step 1. Remember that the more contours you define the faster and better the results.

Make sure the grid you created in the previous exercise is active and visible in the Spatial Editor.

1. Select the Pencil tool located in the top row of the edit tool palette.
2. If you like, make the contours visible again by clicking MB3 over the T (temperature) label in the Data Selector and selecting Display Attributes....
3. Move the cursor over a contour, press and hold MB1 and draw a new position for the contour.
4. Release MB1.

As you drag the cursor with MB1 pressed, you'll see a white line that defines the new position for this contour. When you release MB1, the grid values will be modified such that the new contour will be drawn very near the line you identified.

1. Redraw several more contours using the Pencil tool and get familiar with how it works. Note that you can cross contours and the algorithm behaves as you would expect, more or less.

Select the Zoom tool by clicking MB1 on the Zoom tool icon located in the bottom row of the edit tool palette.

1. Move the cursor over the Spatial Editor display and click MB2. With each MB2 click the display zooms in by a factor of 1.5.
2. With the mouse cursor in the display, click MB1. With each MB1 click, the display zooms out by the same factor of 1.5.
3. Again with the mouse inside the Spatial Editor display, press MB1 and drag. You should see a white rectangle appear and grow as you move the mouse further away from the original press location.
4. Release MB1.

When you MB1 drag with the zoom tool, you can instantly zoom to the area as outlined by the white rectangle.

1. With the mouse inside the display, press and hold MB3 and select Full View.

Now your display should be zoomed out completely.

Make sure that you have at least one weather element active in the Spatial Editor. (see Make Grid Active, Visible, Image )

1. Select the Spatial Sample tool located directly next to the Zoom tool.
2. Move the cursor into the display. Press and hold MB1 and drag the cursor around. You should see a text representation of the value under the cursor.
3. Release MB1.
4. Make a second weather element active in the Spatial Editor.
5. Press and drag MB1 again in the spatial display. You should see both grid values under the cursor displayed.
6. Release MB1.
7. Click MB1 anywhere in the display. You have just added a sample. This will remain until you delete it. Add more samples by clicking MB1 in several other locations.
8. Position your cursor directly under one of the "+" symbols located below one of your samples. If the background is light, it may be difficult to find them.
9. Click MB2 directly on the "+" symbol. Your sample should have disappeared.
10. Press and hold MB3 and select Clear Samples. All of your samples should have been removed.

Make sure that there is a grid visible and active in the Spatial Editor.

1. Find that same weather element in the Temporal Editor. You may have to scroll to make it visible. Expand the vertical size of the temporal pane, so you can view the data more easily.
2. Select the Temporal Sample tool located just to the left of the Select Points tool.
3. Click MB1 anywhere in the spatial display. You should see the temporal editor display a time series. Repeat at a new location to display a time series at that point.
4. Press and hold MB1 in the spatial display. While holding MB1, drag the cursor around and watch the temporal editor. You should see the time series update as you move the sample point within the Spatial Editor.
5. Release MB1.

The Temporal Sample tool is used primarily to view time series displays at a point. It's a good technique to use if you want to scan the forecast temporally, such as viewing the highs and lows for a specific weather element.

Make or find a temperature grid and display it as an image in the spatial editor.

1. Clear the reference set by clicking MB1 on the Clear RefSet button.
2. Use the Select Points tool to define a reference set the size of a few counties.
3. Find the T (temperature) weather element in the temporal editor. Vertically stretch the size of the temporal editor pane so that there's plenty of room to see the time series display.
4. In the temporal scale, located to the left of the time series display, click MB2 to zoom in until the minimum and maximum values are about 20 degrees F apart.
5. Find the data point in the time series that represents the grid displayed in the spatial editor. This point is identified by the dotted yellow line.
6. Click MB1 about 10 degrees F above the data point. Note the change in the spatial editor display. All the points you identified in the spatial editor have been assigned the value you selected in the temporal editor.
7. Initialize about 12 hours worth of temperature data from you favorite model. Use the interpolation facility (Services->Interpolation->By Gaps) to fill in the gaps and get a smooth time-series curve.
8. Back in the temporal editor pane, move the cursor to somewhere near left side of the time-series display. Press and hold MB1 and slowly drag horizontally to define a new temperature curve. As you move the cursor to the next data point, it should snap to your cursor position. Each time this happens, you are modifying data in a different grid.
9. Release MB1.
10. Step through your newly-modified grids using the Grid Manager or the Animator to see that you modified a series of grids with one edit operation.

Repeat this exercise until you are comfortable using the Adjust Scalar temporal tool. This and all the temporal tools are capable of modifying a large quantity of data with only a few edit operations. Used properly, these tools can save you lots of time.

• Purpose: Modify a vector grid values using the temporal editor
• References: User Guide - p. 305-310

Before you begin: Set up your GFE so that the spatial and temporal editors are visible. Load Wind via the Weather Element->Matrix Load... dialog. Make sure that the TE Relative Edit button located in the controller area is still off.

Make or find a Wind grid and display it as an image in the spatial editor.

1. Set the Vector edit state located just below the Delta slider to Mag & Dir.
2. Use the Select Points tool to define a reference set the size of a few counties.
3. Find the Wind weather element in the temporal editor. Vertically stretch the size of the temporal editor pane so that there's plenty of room to see the time series display.
4. In the temporal scale, located to the left of the time series display, click MB2 to zoom in until the minimum and maximum values are about 20 knots F apart. Clicking MB1 zooms out. Dragging MB1 pans the scale.
5. Find the data point in the time series that represents the grid displayed in the spatial editor. This point is identified by the dotted yellow line.
6. Click MB1 about 10 knots above the data point. Note the change in the spatial editor display. All the points you identified in the spatial editor have been assigned the value you selected in the temporal editor.
7. Release MB1.
8. Press and hold MB1 and move the cursor up or down to adjust the vector data point again. Note how the wind barb updates as you adjust the magnitude.
9. Release MB1.

If you're editing wind magnitude only, the vector adjust tool works just like the scalar adjust tool. It's when you edit the direction that things get interesting.

1. Press and hold down the Shift key on your keyboard.
2. Move the cursor over any wind data point, press and hold MB1 and adjust. Note that the wind direction is changing while the magnitude remains constant.
3. Release MB1.

This exercise demonstrates that with the Shift button up, the temporal adjust vector tool changes the magnitude. With the Shift button down, the tool changes the wind direction.

• Purpose: Modify a weather grid values using the temporal editor
• References: User Guide - p. 311-316

Before you begin: Set up your GFE so that the spatial and temporal editors are visible. Load Wx via the Weather Element->Matrix Load... dialog. Make sure that the TE Relative Edit button located in the controller area is still off.

Make or find a Wx grid and display it as an image in the spatial editor.

1. Use the Select Points tool to define a reference set the size of a few counties.
2. Find the Wx weather element in the temporal editor. Vertically stretch the size of the temporal editor pane so that there's plenty of room to see the time series display.
3. In the Spatial Editor legend, select a pickup value by clicking MB2. You may need to invoke the set value dialog to add additional weather types.
4. Find the data point in the time series that represents the grid displayed in the spatial editor. This point is identified by the dotted yellow line.
5. Click MB1 on this data point in the Wx pane of the temporal editor. You should see the temporal editor paint the same color/pattern as you selected in the spatial editor legend. The spatial editor will show you that the area that you selected in Step 2 has been set to this new value.

The temporal Set Value tool does not support drag operations as with the scalar and vector tools. Only MB1 clicks will modify data in the Wx pane.

• Purpose: Modify scalar grid values in Relative Edit mode
• References: User Guide - p. 46, p. 300

The previous temporal editor exercises demonstrated how TE Absolute mode works. Every time you make a change to the temporal value, that value is assigned to the entire area you selected in the spatial editor. TE Relative mode works differently in that the relative change is applied to the selected area. For example, if you made a +5 degree change to your temperature time-series, 5 degrees is added to every point in the selected area. This preserves the relative gradients in the area which is sometimes very desirable.

Before you begin: Set up your GFE so that the spatial and temporal editors are visible. Load T (temperature) via the Weather Element->Matrix Load... dialog if T is not loaded already.

Turn on TE Relative mode located in the controller area.

1. Make or find a temperature grid and display it as an image in the spatial editor.
2. Use the Select Points tool to define a reference set the size of a few counties. Try to select an area where there is a temperature gradient.
3. Find the T (temperature) weather element in the temporal editor. Vertically stretch the size of the temporal editor pane so that there's plenty of room to see the time series display.
4. In the temporal scale, located to the left of the time series display, click MB2 to zoom in until the minimum and maximum values are about 20 degrees F apart.
5. Find the data point in the time series that represents the grid displayed in the spatial editor. This point is identified by the dotted yellow line.
6. Adjust this data point about 5 to 10 degrees higher. Note the change in the spatial editor display. The 5-10 degree change you applied to the time-series point has been applied to all of the points inside the selected area. The gradient that was present before the temporal edit should still exist.
7. Use the MB1 drag operation in the temporal editor to modify several grids with the same operation. Step through these edited grids to verify that the data were modified inside the selected area.