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GFS Forecasting

This page displays different GFS maps (Global Forecast System). These forecasts are generated and uploaded 3-4 times per day when data is availible. Please note that the forecast maps are shown in UTC or Zulu time. New forecast maps are availible!

Choose type of map to show:

Note: These calculated forecast maps can depart significantly from actual weather.

WEATHER TRIVIA -  Weather TermsFlash Flood Warning - Flash flooding is occurring, imminent or highly likely. A flash flood is a flood that occurs within 6 hours of excessive rainfall and that poses a threat to life and/or property. Ice jams and dam failures can also cause flash floods. These warnings are issued on a county by county basis by the local Weather Forecast Office in Chicago/Romeoville and are generally in effect for up to 6 hours.