Severe Thunderstorms Possible for the Great Lakes into Ohio Valley; Heavy to Excessive Rainfall Over the Southern Plains

Severe thunderstorms will race along a cold front from the Upper Mississippi Valley into the Great Lakes and Ohio Valley with the main threat being damaging winds. The tail end of this front will possibly produce heavy to excessive rainfall across the southern Plains into the Lower Mississippi Valley through Saturday. Finally, Major-to-record river flooding continues across the Carolinas.
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Coastal Waters Forecast for Northerly Island to Calumet Harbor IL (LMZ742) (Text-Only)
NWS Forecast for: Northerly Island to Calumet Harbor IL (LMZ742)
Issued by: National Weather Service Chicago, IL
Last Update: 313 AM CDT Fri Sep 21 2018
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Today: Southwest winds to 30 kt becoming northwest in the afternoon. Mostly cloudy. Waves 2 to 4 ft building to 3 to 5 ft.

Tonight: North winds 20 to 25 kt becoming northeast 10 to 20 kt after midnight. Mostly cloudy. Waves 4 to 6 ft occasionally to 8 ft then 3 to 6 ft occasionally to 8 ft after midnight.

Saturday: East winds 10 to 15 kt. Mostly sunny. Waves 3 to 6 ft occasionally to 8 ft subsiding to 2 to 4 ft.

Saturday Night: Southeast winds 5 to 10 kt becoming south after midnight. Mostly clear. Waves 1 to 3 ft subsiding to 1 ft or less after midnight.



Zone Forecast: Northerly Island to Calumet Harbor IL (LMZ742)

Visit your local NWS office at: http://www.crh.noaa.gov/lot