Enhanced Risk for Severe Thunderstorms Across the Upper Midwest; Flash Flooding Possible from the Upper Midwest to Southern Plains and Desert Southwest Through Friday

Portions of the Upper Midwest will see an increased threat for severe thunderstorms through this evening, with a few strong tornadoes possible. The same region remains on alert for additional flash flood concerns. Heavy rainfall may lead to flash flooding across the Desert Southwest today, and Southern Plains by Friday. Finally, Major-to-record river flooding continues across the Carolinas.
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Last Update: 1008 AM EDT Thu Sep 20 2018

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Detroit/Pontiac, MI Local Forecast Office

12NM N Port Sanilac MI

Marine Zone Forecast

...SMALL CRAFT ADVISORY IN EFFECT FROM FRIDAY AFTERNOON THROUGH SATURDAY MORNING...
Rest Of Today
South winds 10 to 15 knots becoming southeast 15 to 20 knots in the afternoon. Light showers and a chance of thunderstorms. Waves 1 to 3 feet building to 3 to 5 feet late in the afternoon. Waves occasionally around 7 feet.
Tonight
South winds 15 to 20 knots. Mostly cloudy early in the evening becoming partly cloudy. Light showers likely and a chance of thunderstorms early in the evening...then a chance of light showers and a slight chance of thunderstorms in the late evening and overnight. Waves 3 to 5 feet. Waves occasionally around 7 feet.
Friday
Southwest winds 15 to 20 knots increasing to 20 to 25 knots with gusts to 30 knots in the late morning and afternoon. Partly cloudy. A chance of light showers and a slight chance of thunderstorms. Waves 3 to 5 feet. Waves occasionally around 7 feet.
Friday Night
West winds to 30 knots becoming northwest 20 to 25 knots with gusts to 30 knots in the late evening and overnight. Partly cloudy with a chance of light showers early in the evening...then partly cloudy in the late evening and overnight. Waves 4 to 6 feet building to 6 to 9 feet after midnight. Waves occasionally around 12 feet. small craft advisory conditions are expected to continue beyond the forecast period. Please refer to the open lakes forecast for more information. see lake huron open lake forecast for days 3 through 5.
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Last Update: 1008 AM EDT Thu Sep 20 2018
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