Surface Prog Chart Help

Surface Prog Charts

Prog Charts are forecasts for surface conditions. These are generated by WPC and rendered for the web site. WPC provides an analysis updated every three hours plus 12 and 24 hour forecasts updated four times a day and a 36 and 48 hour forecast updated twice a day. In addition, medium range forecasts every day from three to seven days are also provided. These are valid for the contiguous United States.

Product Frequency Times
Current Analysis 3 hours every 3 hours about 90 minutes after valid time
12 hour Forecast 4 times daily ~0200 (valid 12Z), 0400 (18Z), 1400 (00Z), and 1630 (06Z)
24 hour Forecast 4 times daily ~0430 (valid 00Z), 0700 (06Z), 1630 (12Z), and 1930 (18Z)
36 hour Forecast Twice daily ~0730 (valid 12Z), 1930 (00Z)
48 hour Forecast Twice daily ~0730 (valid 00Z), 1930 (12Z)
3, 4, 5, 6 and 7 day Forecasts Once daily ~0300 (valid 12Z). The 3 day forecast is actually a 3 1/2 day forecast

Plot Legend

See WPC Product Page for plot description and legend


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