Use the forms below to enter parameters for the analog forecast application

Look for Analog Matches in This Box

North Lat West Lon
South Lat East Lon

Remember that longitude runs from 0 to 360 (no E-W).
Click HERE for a blank map with labelled grid lines.
Forecast is for This Box

North Lat West Lon
South Lat East Lon
Last month to start evaluation (e.g., 4 for April):
Number of Months (up to 12) to evaluate for analog matches (e.g., 2 for Mar-Apr):
Year of last month to start evaluation:
Months Ahead (up to 12) to generate forecast (e.g., 2 for Jun forecast from Mar-Apr analogs):

For example, to evaluate Mar-Apr, 2010, data to forecast Jun 2010, choose 4, 2, 2010, 2 (from top to bottom).
Theme to Forecast: 1 = SLP, 2 = Pressure level height (enter below), 3 = 2-Meter Temps, and 4 = Pressure level temperature (enter below) Choose Variable (1-4):
Pressure Levels: 0 = 1000mb, 1 = 925mb, 2 = 850mb, 3 = 700mb, 4 = 600mb, 5 = 500mb, 6 = 400mb, 7 = 300mb, 8 = 250mb, 9 = 200mb, 10 = 150mb, 11 = 100mb, 12 = 70mb, 13 = 50mb, 14 = 30mb, 15 = 20mb, 16 = 10mb
Enter Pressure Level for Height Analysis: (see above)         Enter Pressure Level for Temp Analysis: (see above)  
Weighting for Analog Selections (-100 to 100):

SLP Pressure Height T2M Pressure Temp SST PDO NPM SOI

Auto Weight (0 = No, 1 = Yes):        Detrend Data (0 = No, 1 = Yes):

Note 1: If the analysis OR forecast box is entirely over land, program might crash due to no SST data.
Note 2: Weights must be whole numbers. Total need not add to 100.
Note 3: Auto weighting uses a multiple linear regression to find the best historical correlations. Manual weights are ignored.

   (to reset form, select "Theme to Forecast" 0 and press button)


Once it starts, DO NOT HIT REFRESH.
The program takes up to 1 minutes to run,
Wait for completion message and URL links below.