Heavy rain and flash flooding possible in portions of the Southwest this weekend

An upper-level low in the Southwest U.S. will act as a trigger for thunderstorms this weekend. The area of greatest concern is in New Mexico, southeast Utah and portions of southern Colorado. Storms will be slow moving and could bring several rounds of rain to the same areas. Rainfall amounts may exceed 3 inches in localized areas. Flash Flood Watches are in effect.
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Last Update: 1228 PM EDT Sun Aug 20 2017

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Philadelphia, PA Local Forecast Office

14NM SSE Lewes DE

Marine Zone Forecast


Synopsis: High pressure will build in from the Ohio Valley today and then move offshore on Monday. A cold front will approach from the Midwest on Tuesday while high pressure remains anchored off the eastern seaboard. The front is expected to move through the area on Wednesday. Canadian high pressure builds into the region late in the week.

This Afternoon
N winds 5 to 10 kt with gusts up to 15 kt. Seas 2 ft or less. Mainly in SE swell with a dominant period of 8 seconds.
Tonight
N winds 5 to 10 kt, becoming S in the late evening and early morning, then becoming NW late. Seas 2 ft or less. Mainly in SE swell with a dominant period of 8 seconds.
Mon
Wind variable less than 5 kt, becoming S around 5 kt late in the morning, then increasing to 5 to 10 kt with gusts up to 15 kt early in the afternoon, increasing to 10 to 15 kt late. Seas 2 ft or less. Mainly in SE swell with a dominant period of 9 seconds.
Mon Night
S winds 10 to 15 kt with gusts up to 20 kt. Seas 2 ft or less. Mainly in SE swell with a dominant period of 10 seconds.
Tue
SW winds 10 to 15 kt, becoming S 15 to 20 kt in the afternoon. Seas 3 to 4 ft.
Tue Night
SW winds 15 to 20 kt with gusts up to 25 kt. Seas 3 to 5 ft.
Wed
SW winds 10 to 15 kt, becoming W 5 to 10 kt in the afternoon. Seas 3 to 4 ft. A chance of tstms. A chance of showers in the morning, then showers likely in the afternoon.
Wed Night
NW winds 10 to 15 kt. Seas around 3 ft. A chance of showers in the evening.
Thu
N winds 5 to 10 kt. Seas around 3 ft.
Thu Night
NE winds around 5 kt, becoming N after midnight. Seas 2 ft or less. 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: 1228 PM EDT Sun Aug 20 2017
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