This chapter covers the following functions:

• Create Forecast
• Create Affected Area
• Import Affected Area
• Edit Forecast
• Publish Forecast
• Delete Forecast

Create Forecast

From the Forecast List section of the EVITA Forecast window, click on the Create Forecast button:

Provide high level detail and click on the Save button:

The Forecast is now added to the Forecast List, and you can resume the creation process, and create the Affected Area(s.) 
Note that the status is set to Draft in both the State column in the Forecast List, and in the info banner in the Forecast Details:

Create Affected Area

Click on the Create Affected Area button...

 ... and start editing from the currently empty Affected Area Details section:

1.  Select the Concentration Level from the pull-down menu (this will also determine the color in which the area will be plotted on the Map):

2. Click on the Save button

3.  The newly created Affected Area is now present in the Forecast Details section corresponding to the Validity Period selected in the Forecast List:

The Area table features 6 columns:

• Delete Icon: enabled, in Edit mode, to a selected row
• Seq: the sequence number
• Colour: the Concentration Level color as defined at he Create Affected Area step
• Text: displays the Concentration Level label
• FL Range: the Flight Level ranges covered
• # P: the number of prisms defining the area

4.  The next typical step would be to create a Prism to spatially define the selected area - so click on the Create Prism button:

5. Specify the Lower Limit and Upper Limit for the area
   
6. Enter the coordinates forming the Prism. Two methods are available:
   
   1. Copy the coordinates from another source
      The easiest way to achieve this is via the EVITA Interactive Map:
      
      i. Use the Area drawing tool to draw the shape of the polygon, and copy the coordinates set to the clipboard:
      
      
      
      ii. Paste the coordinates set in the Free Text area:
      
      
      
      iii. Click on the To Table button to convert the data:
      
      
      
      iv. Consider using the Validate Polygon function:
      
      
      
      v. Save the data
      
      vi. You may at this point either create additional Prism(s) with the same Create Prism function (an Affected Area may be composed of several prisms), or have it displayed on the Map with the Plot Prism button:
      
      
      
      
   2. Manual entry in the form of a Table:
      Under certain circumstances, you may wish to type in the individual Latitude and Longitude of the polygon/shape by clicking under the Lat tab and then enter the first coordinates, then click on the keyboard Tab or Enter key to go to the next coordinate field, and repeat the process until the area is completed.
      
       
      
      
      Note: The polygon must be closed by repeating the first coordinates. Clicking on the Close Polygon button will automatically close the polygon.
7. Repeat the steps described above to complete the graphical description of the Forecast for the selected Validity:
   
   
   1. Create all necessary Concentration Levels required - and associated Prisms:
      
      
   2. Check the result by means of the Plot Forecast button:
      
      

Import Affected Area

Use the Import Affected Area button to import a .CSV file:

Edit Forecast

Listed Forecasts may be modified by their respective authors/owners - simply click in a given table row to load the corresponding data in the Forecast Details editor.

Next click on the Edit button to unlock the item and make the necessary changes and modifications.

When the modifications are done, you can click on the Apply button to update the Draft document - or the Save button to update the Draft document and quit the edit mode.

And click on the Cancel button to discard any changes and leave the Edit mode...

Publish Forecast

Click on the Publish button to have the Forecast visible to other EVITA users:

In the Forecast List section, the State is now set to Published, as well as in the info banner in the Forecast Details:

The reverse operation is achieved by means of the Unpublish button:

Delete Forecast

You can only delete Forecasts in Draft mode (that is, not yet published).

To do so, click on the red cross at the beginning of the concerned table row: