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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Last Update: 228 PM PDT Thu Sep 20 2018

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Portland, OR Local Forecast Office

39NM W Newport OR

Marine Zone Forecast


Synopsis: A 1009 mb surface low near about 250 nm west of Vancouver Island early this afternoon will weaken tonight. A deeper low pressure area reaches Vancouver Island Friday evening. High pressure rebuilds over the waters late Saturday and will persist through at least the first half of next week.

Tonight
NW wind to 10 kt. Wind waves NW 1 ft at 4 seconds. NW swell 2 ft at 9 seconds.
Fri
SW wind less than 10 kt, becoming S 10 to 15 kt in the afternoon. Wind waves SW 2 ft at 4 seconds. NW swell 4 ft at 8 seconds.
Fri Night
SW wind 10 to 15 kt. Gusts to 20 kt early in the evening. Wind waves SW 3 ft at 4 seconds. NW swell 5 ft at 8 seconds. Rain likely.
Sat
W wind to 10 kt. Gusts to 15 kt in the afternoon. Wind waves W 2 ft at 4 seconds. NW swell 7 ft at 9 seconds.
Sat Night
NW wind to 10 kt with gusts to 15 kt. Wind waves NW 3 ft at 4 seconds. NW swell 4 ft at 8 seconds.
Sun
N wind 10 to 15 kt with gusts to 20 kt. Wind waves 3 ft. NW swell 4 ft.
Sun Night
N wind 15 to 20 kt with gusts to 25 kt. Wind waves 5 ft. W swell 2 ft.
Mon
N wind 20 to 25 kt. Gusts to 30 kt. Wind waves 7 ft. W swell 2 ft.
Tue
N wind 20 to 25 kt. Gusts to 30 kt. Wind waves 7 ft. NW swell 3 ft.


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ABOUT THIS FORECAST

Last Update: 228 PM PDT Thu Sep 20 2018
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