Heavy Rain and Potential for Flash Flooding for Mid-Atlantic

A strong storm system will bring heavy rain to the Mid-Atlantic and central Appalachians into Saturday. Flash flooding and widespread lowland flooding are possible during this period. Meanwhile, monsoon moisture will continue to produce heavy rain with the possibility of localized flash flooding in the Desert Southwest through the southern/central Rockies and High Plains.
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Last Update: 620 AM EDT Sat Jul 29 2017

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Gray/Portland, ME Local Forecast Office

20NM ENE Portsmouth NH

Marine Zone Forecast


...SMALL CRAFT ADVISORY IN EFFECT THROUGH THIS EVENING...
Synopsis: ANZ100-300030- 620 AM EDT Sat Jul 29 2017 .Synopsis for Stonington ME to Merrimack River MA out to 25 NM... High pressure builds south out of Quebec through the weekend while low pressure moves east just south of Cape Cod. High pressure moves offshore on Monday with a cold front dropping into the Gulf of Maine from the northwest on Tuesday. $$

Today
NE winds 20 to 25 kt. Seas 2 to 4 ft.
Tonight
NE winds 10 to 20 kt with gusts up to 25 kt. Seas 2 to 4 ft.
Sun
N winds 10 to 20 kt with gusts up to 25 kt, becoming NE 5 to 10 kt in the afternoon. Seas 3 to 5 ft.
Sun Night
SE winds around 5 kt, becoming N around 5 kt after midnight. Seas around 3 ft. Patchy fog after midnight with vsby 1 to 3 nm.
Mon
NE winds around 5 kt, becoming SE in the afternoon. Seas around 3 ft. Patchy fog in the morning with vsby 1 to 3 nm.
Mon Night
S winds 5 to 10 kt, becoming W after midnight. Seas around 3 ft.
Tue
NE winds around 5 kt. Seas 2 to 3 ft.
Tue Night
SW winds around 5 kt. Seas around 2 ft.
Wed
SW winds 5 to 10 kt. Seas 2 to 4 ft. A chance of showers and tstms.
Wed Night
SW winds 5 to 10 kt with gusts up to 20 kt. Seas 3 to 5 ft. A chance of showers. 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: 620 AM EDT Sat Jul 29 2017
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