Use the forms below to enter parameters for the analog forecast application    (YouTube Video Instructions 7:40)

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):
Number of Analogs to use for the analogs forecast (1-5):

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):        Use Pearson's R (0 = No/Default RMS, 1 = Yes/Pearson):

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.
Note 4: Using the Pearson's R option automatically disables the Auto Weight. Weight values from boxes will be used. Use carefully.
Override Selection Criteria and Manually Choose 5 Match Years:

Manual Override (0 = No, 1 = Yes):       Year 1    Year 2    Year 3    Year 4    Year 5

Note 1: Make sure that your match year is not for a month that is in the future!
Note 2: All weightings will be ignored.
Note 3: Make sure that all years are different.

   (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 link below.