National Weather Service United States Department of Commerce

Snowy, Very Cold and Windy from the Northern Plains to Great Lakes; Critical Fire Weather in South Texas

Moderate to heavy lake effect snow is expected downwind of the Great Lakes, with the Chicago metro potentially receiving 6 to 12 inches of snowfall. A frigid airmass will bring very cold temperatures to the Central U.S. and Mississippi Valley today, migrating into the Eastern U.S. on Monday. Dry and windy weather will bring critical fire weather conditions to South Texas today. Read More >

12-hour helicity forecast

 

Figure 5: ETA 12 Hour Forecast of 300 K isentropic surface,
wind and relative humidity valid 1200 UTC May 12, 1997.

 

18-hour helicity forecast

 

Figure 6: ETA 18 Hour Forecast of 300 K isentropic surface,
wind and relative humidity valid 1800 UTC May 12, 1997.