These 5-day forecasts come from the National Weather Service's GFS (previously AVN)
forecast model. The 5-day forecasts are updated twice a day (early morning, and around noon) and are at 12 hour intervals, with valid times
around 7 a.m. and 7 p.m. The 12-hourly interval forecast fields include:
(1) Surface Pressure & Precipitation Amounts (seen above);
(2) Near-Surface (1000 mb) Temperature & Wind;
(3) 850 mb Temperatures, which provides a good measure of the air mass temperature;
(4) 850 to 500 mb Relative Humidity, which shows areas of disturbed weather (high humidity);
and (5) 300 mb Winds, which gives winds at the jet stream level. Move your mouse over the blue bar to change forecast times.