A forecast run is the set of model alternatives that run sequentially during a forecast. As the with model alternatives, forecast runs exist independent of time. Therefore, you can use a forecast run for any forecast time window.

You create a forecast run by selecting a model alternative for each CWMS program. There are seven standard programs in CWMS, a typical forecast run will include a combination of the six model alternatives. When you execute a forecast, CWMS executes the programs in sequential order.

The table shows three suggested forecast runs. The codes are the names CWMS automatically assigns to each forecast run based on the one-character Model Alternative Keys you have assigned to the model alternatives. This coding is program order dependent.

Example Forecast Run


Name

Code

No future precip

NNNNN

QPF

QNNNN

Two times QPF

SWRBE

In the following example, the forecast alternative named Two times QPF has the code SWRBE. Each character in this code is the ID of a specific model alternative for each of the six standard programs in CWMS. The code translates as follows:

Creating Forecast Run

Before this step can be done, you must have created model alternatives.

Creating forecast runs: 

  1. From the Models menu in the Setup Module, click Forecast Runs, and the Forecast Run Editor (Figure 1) opens.
  2. Click New, enter a new forecast run name in the Name field (required), a description in the Description field (optional).
    Figure 1 Forecast Run Editor
  3. Select program order from the Program Order drop-down list. See Program Order for more information.
  4. From each program listed below the Program Order, select the model alternatives for the forecast run.
  5. From the File menu, click Save. The new forecast alternative appears in the table on the Forecast Run Editor (Figure 1).
  6. Click OK, and the Forecast Run Editor closes.
  7. Save your watershed.

Delete a Forecast Run

Delete a forecast run: 

  1. From the Models menu in the Setup Module, click Forecast Runs, and the Forecast Run Editor (Figure 1) opens.
  2. From the table, select the forecast run you want to delete.
  3. From the File menu, click Delete and a delete confirmation dialog opens.
  4. Click Yes, and the forecast run will be removed from the table on the Forecast Run Editor.
  5. Click OK and the Forecast Run Editor closes.
  6. Save your watershed.