Widespread Summer Heat; Multiple Spots For Severe Weather

A large ridge of high pressure continues to deliver summer heat w/ humidity in several sections of the country. Excessive heat warnings and heat advisories are in effect across the Desert Southwest, south-central Plains, Mid to Lower Mississippi Valley and a small part of the Mid-Atlantic. Meanwhile, severe thunderstorms are possible from the Mid-Atlantic to the Ohio Valley and central Plains.
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Hazardous Weather Conditions

Last Update: 648 PM EDT Tue Aug 20 2019

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Philadelphia, PA Local Forecast Office

15NM E Lewes DE

Marine Zone Forecast


Synopsis: A nearby front will lift slowly northward into New York and New England tonight and on Wednesday. A slow moving cold front is forecast to approach from the northwest on Wednesday night and Thursday. The boundary is expected to pass through our region on Thursday night. High pressure is anticipated to follow for the coming weekend and for the early part of next week.

Tonight
S winds 5 to 10 kt. Seas 2 ft or less. Swell mainly from the SE with a dominant period of 10 seconds. a slight chance of showers and tstms this evening. A slight chance of showers and tstms late. Patchy fog late this evening and early morning.
Wed
SW winds 5 to 10 kt, becoming S 15 to 20 kt. Seas 2 ft or less, then 3 to 4 ft in the afternoon. Swell mainly from the SE with a dominant period of 10 seconds.
Wed Night
SW winds 15 to 20 kt, diminishing to 10 to 15 kt after midnight. Seas 3 to 4 ft. Swell mainly from the S with a dominant period of 8 seconds. a chance of showers and tstms until early morning.
Thu
SW winds around 10 kt. Seas 3 to 4 ft. Swell mainly from the S with a dominant period of 7 seconds. a chance of showers and tstms in the afternoon.
Thu Night
SW winds around 10 kt, becoming W after midnight. Seas 3 to 4 ft. Showers likely with a chance of tstms.
Fri
N winds 5 to 10 kt. Seas 3 to 4 ft. A chance of showers and tstms.
Fri Night
N winds 5 to 10 kt. Seas around 3 ft. A chance of showers and tstms.
Sat
NE winds 10 to 15 kt. Seas around 3 ft. A chance of showers in the morning.
Sat Night
NE winds 5 to 10 kt. Seas 2 ft or less, then around 3 ft after midnight.
Sun
NE winds 10 to 15 kt. Seas 3 to 4 ft.
Sun Night
E winds around 15 kt with gusts up to 20 kt. Seas 3 to 5 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: 648 PM EDT Tue Aug 20 2019
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