Area Forecast Discussion
Issued by NWS Mt. Holly, NJ

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000 FXUS61 KPHI 221351 AFDPHI Area Forecast Discussion National Weather Service Mount Holly NJ 951 AM EDT MON AUG 22 2016 .SYNOPSIS... High pressure centered over the lower Ohio River Valley early this morning will build to the east. The center of the high is forecast to pass over our region on Tuesday before moving off the coast and drifting out to sea. A cold front approaching from the northwest is expected to arrive on Friday. Another area of high pressure is anticipated to build from the Great Lakes to New England and southeastern Canada over the weekend. && .NEAR TERM /UNTIL 6 PM THIS EVENING/...
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Wonderful late summer weather across the northern middle atlantic region today with high pressure building in. Dew points and temperatures are much lower than they have been the last few weeks. Northwest winds will remain light to moderate with gusts up to 20 mph at times. Highs will be near normal with low to mid 80s expected in most areas.
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&& .SHORT TERM /6 PM THIS EVENING THROUGH 6 AM TUESDAY/... A quiet and cool night ahead across the area tonight as high pressure builds across the east coast. Light winds and clear skies will allow for good radiational cooling to take place. With low dewpoints, temperatures will be able to fall several degrees below normal across the region. && .LONG TERM /TUESDAY THROUGH SUNDAY/... High pressure is forecast to be located over our region on Tuesday. We are anticipating a mostly clear sky and low humidity for Tuesday and Tuesday night. Maximum temperatures should favor the middle and upper 70s in the north and the lower and middle 80s elsewhere. Overnight low are expected to be mainly in the middle and upper 50s except in urban areas and along the coast where minimum readings will likely be in the 60s. A clear sky and light wind may allow for the development of late night river valley fog across parts of eastern Pennsylvania and northern New Jersey. The center of the high is forecast to pass off the coast and begin moving out to sea on Wednesday. Our region should then be in the southerly return flow on the back side of the high late in the week with a gradual increase in both heat and humidity anticipated. Maximum temperatures should again be around 90 degrees in our central on southern counties on Friday. No precipitation is expected for Wednesday and Thursday. The model guidance continues to bring a cold front from the northwest into our region on Friday. The guidance has been trending toward lessening the precipitation with the front, so we will mention only a slight chance of showers and thunderstorms for that time period. High pressure is expected to build down from the northwest and north for the weekend and we will continue the dry forecast. Highs on Saturday and Sunday should favor the 80s. && .AVIATION /14Z MONDAY THROUGH FRIDAY/...
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The following discussion is for KPHL, KPNE, KTTN, KABE, KRDG, KILG, KMIV, KACY and surrounding areas. Mostly VFR conditions are expected across the TAF sites through the period. The only exceptions would be if any fog develops around or shortly before daybreak Tuesday. Otherwise, mostly clear skies are expected today and tonight with only some high level clouds. Winds will increase out of the northwest today and gust around 20 knots through the day. The gusts will drop off around or just before sunset, and eventually become light and variable/calm overnight as high pressure builds across the area. OUTLOOK... Tuesday through Friday...Mainly VFR.
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&& .MARINE... A Small Craft Advisory remains in place across the waters as winds are expected to gust around 25 knots behind the cold front that is offshore now and the secondary frontal boundary moving across the area later today. The gusts are expected to drop off this evening as winds lighten while high pressure builds across the area overnight. OUTLOOK... Tuesday through Friday...No marine headlines are anticipated. RIP CURRENTS... There is a low risk for the development of dangerous rip currents today due to the offshore flow. The probable risk for the development of dangerous rip currents on Tuesday is low. && .PHI WATCHES/WARNINGS/ADVISORIES... PA...None. NJ...None. DE...None. MD...None. MARINE...Small Craft Advisory until 6 PM EDT this evening for ANZ430- 431-450>455. && $$ Synopsis...Iovino Near Term...Robertson/Po Short Term...Robertson Long Term...Iovino Aviation...Iovino/Robertson/Po Marine...Iovino/Robertson

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