Dangerous Heat Building in the West; Severe Storms in the Upper Midwest

A long duration heat wave will build across the Southwest, California, and Pacific Northwest. Dangerous heat is also forecast for the Great Basin and South Plains. Severe storms in the Upper Midwest may have locally heavy rain, damaging winds, and very large hail. Heavy rain and flooding will also be possible in the Deep South and Appalachians.
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Last Update: 101 AM EDT Fri Aug 14 2020

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Philadelphia, PA Local Forecast Office

15NM E Lewes DE

Marine Zone Forecast


Synopsis: A front over the area will slowly sag southward through Saturday as high pressure builds in from the north and west. Several waves of low pressure will develop along this boundary and pass south and east of New Jersey through the weekend. High pressure tries to establish itself over the area early in the new week. The old frontal boundary then lifts north as several areas of low pressure develop on it and approach from the south late next week.

Rest Of Tonight
NE winds 5 to 10 kt. Seas 2 ft or less. A slight chance of showers. Swell mainly from the SE with a dominant period of 9 seconds.
Fri
NE winds around 10 kt, increasing to around 15 kt with gusts up to 20 kt in the late morning and afternoon. Seas around 3 ft. A chance of showers in the morning, then a chance of tstms in the afternoon. Swell mainly from the SE with a dominant period of 9 seconds, becoming mainly from the NE with a dominant period of 5 seconds in the afternoon.
Fri Night
NE winds 10 to 15 kt. Gusts up to 20 kt early in the evening. Seas 3 to 4 ft. A chance of tstms early in the evening. Swell mainly from the NE with a dominant period of 5 seconds.
Sat
NE winds around 15 kt with gusts up to 20 kt. Seas 3 to 5 ft. A chance of tstms. Swell mainly from the NE with a dominant period of 6 seconds.
Sat Night
E winds around 15 kt with gusts up to 20 kt. Seas 4 to 6 ft. A chance of tstms in the evening, then tstms likely after midnight.
Sun
E winds 10 to 15 kt with gusts up to 20 kt. Seas 4 to 6 ft. Tstms likely.
Sun Night
E winds around 10 kt with gusts up to 20 kt, becoming N after midnight. Seas 3 to 5 ft. Tstms likely, mainly in the evening.
Mon
NW winds 5 to 10 kt. Seas 3 to 4 ft. A chance of tstms.
Mon Night
W winds around 5 kt. Seas 3 to 4 ft. A chance of tstms in the evening.
Tue
W winds 5 to 10 kt. Seas around 3 ft.
Tue Night
SW winds around 5 kt, becoming NW after midnight. Seas around 3 ft. winds and seas higher in and near tstms.

Winds and seas higher in and near tstms.
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ABOUT THIS FORECAST

Last Update: 101 AM EDT Fri Aug 14 2020
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