Increasing Risk for Flash and River Flooding Through the Weekend

A storm system will track across the central U.S. and set the stage for severe thunderstorms and widespread heavy rainfall through the weekend. There will be a threat for flash and river flooding for portions of the Southern Plains into the Upper Midwest.
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Last Update: 837 AM CDT FRI APR 28 2017

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Chicago, IL Local Forecast Office

22NM NE Evanston IL

Marine Zone Forecast

WAVES ARE PROVIDED AS A RANGE OF SIGNIFICANT WAVE HEIGHTS, WHICH IS THE AVERAGE OF THE HIGHEST 1/3 OF THE WAVE, ALONG WITH THE AVERAGE HEIGHT OF THE HIGHEST 10% OF THE WAVES WHICH WILL OCCASIONALLY BE ENCOUNTERED.

SHEBOYGAN WI TO PENTWATER MI SOUTH
Synopsis: LOW PRESSURE OF 29.3 INCHES OVER JAMES BAY WILL HOLD STATIONARY TODAY WHILE WEAK HIGH PRESSURE OF 29.9 INCHES ACROSS SOUTHERN LAKE MICHIGAN INCHES NORTHWARD. LARGER HIGH PRESSURE WILL THEN DEVELOP AND MOVE ACROSS ONTARIO SATURDAY WHILE LOW PRESSURE OF 29.5 INCHES DEVELOPS OVER THE SOUTHERN PLAINS. THIS LOW WILL DEEPEN TO 29.3 INCHES AS IT LIFTS INTO IOWA SUNDAY NIGHT...AND TO 29.2 INCHES AS IT MOVES TO THE WESTERN GREAT LAKES ON MONDAY. A TRAILING COLD FRONT WILL MOVE ACROSS THE LAKE MONDAY NIGHT WHILE THE LOW MOVES TO QUEBEC TUESDAY.

Rest Of Today
West winds 10 to 15 kt backing to northeast by mid afternoon. Chance of rain showers this afternoon. Waves 2 to 4 ft subsiding to 1 to 3 ft.
Tonight
Northeast winds 10 to 15 kt gradually increasing to 30 kt by the predawn hours. Chance of rain showers...mainly in the evening. Waves building to 4 to 6 ft occasionally to 8 ft.
Saturday
Northeast winds to 30 kt. Chance of rain showers. Waves 6 to 9 ft occasionally to 11 ft.
Saturday Night
Northeast winds to 30 kt. Occasional gales to 35 kt. Rain showers likely in the evening...then rain showers overnight. Waves 6 to 9 ft occasionally to 11 ft.
Sunday
East winds to 30 kt becoming northeast. Rain showers with a chance of thunderstorms in the morning...then rain showers in the afternoon. Waves 5 to 8 ft occasionally to 10 ft.
Sunday Night
East winds to 30 kt becoming southeast 15 to 25 kt. Rain showers. Waves 4 to 7 ft occasionally to 9 ft.
Monday
South winds to 30 kt. Chance of rain showers. Waves 4 to 6 ft occasionally to 8 ft.
Tuesday
West gales to 35 kt. Waves 6 to 9 ft occasionally to 11 ft.
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ABOUT THIS FORECAST

Last Update: 837 AM CDT FRI APR 28 2017
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