Area Forecast Discussion
Issued by NWS Mt. Holly, NJ

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471 FXUS61 KPHI 180336 AFDPHI Area Forecast Discussion National Weather Service Mount Holly NJ 1136 PM EDT Tue Oct 17 2017 .SYNOPSIS...
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High pressure centered over the mid-Atlantic region will dominate the weather pattern through the upcoming weekend. The only interruption will be a weak frontal boundary approaching from the north Wednesday night into early Thursday. As the high moves off the coast this weekend, a strong southerly flow will bring much warmer- than-normal temperatures to the region through Monday. A series of cold fronts will usher in rain...and colder temperatures...during the first half of next week.
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&& .NEAR TERM /UNTIL 6 AM WEDNESDAY MORNING/...
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Clear and cold through the overnight as high pressure dominates the East Coast. Frost Advisory in effect for NJ Pine Barrens. Patchy frost otherwise across Delmarva, Lehigh Valley, and northern and central NJ. Lows tonight in the low/mid 30s over rural NJ and upper 30s to low 40s elsewhere.
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&& .SHORT TERM /6 AM WEDNESDAY MORNING THROUGH 6 PM WEDNESDAY/...
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High pressure continues across the region. Another sunny day is expected area-wide. Temperatures will moderate back to a couple degrees above normal levels with highs in the upper 60s to low 70s. Winds will be light mostly from the SW.
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&& .LONG TERM /WEDNESDAY NIGHT THROUGH TUESDAY/...
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The mid-level pattern associated with the long term period begins with a low-amplitude ridge across the eastern section of the country Wednesday night. A weak trough moves through early Thursday before another mid-level ridge sets up shop over the east coast by Friday, with the amplitude of this ridge increasing through the weekend. A deep mid-level trough then approaches from the west late Tuesday, signifying major changes next week. At the surface, high pressure centered over the central Applachians Wednesday morning will drift south Wednesday night and Thursday as a weak boundary slides in from the north. No precipitation is expected with this boundary, so its only noticeable effect may be a slight shift in wind direction and a slight drop in relative humidity. Then as the surface high begins to push back north, the nice weather will continue. With the amplitude of mid-level ridging increasing into early next week, and a southerly flow at the surface, temperatures will continue to rise too, maxing out 10 to 15 degrees above normal on Saturday, Sunday, and Monday. A cold front will begin to cool temperatures down Monday night, with a stronger cold front on Tuesday bringing with it the coldest temperatures of the autumn season so far by the middle of next week.
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&& .AVIATION /04Z WEDNESDAY THROUGH SUNDAY/...
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The following discussion is for KPHL, KPNE, KTTN, KABE, KRDG, KILG, KMIV, KACY and surrounding areas. VFR through Wednesday night. Light winds through daybreak, and then light SW winds on Wednesday. Outlook... Wednesday Night through Sunday...VFR.
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&& .MARINE... Light winds and fair weather through Wednesday. Outlook... Wednesday Night through Sunday...No marine headlines expected. && .PHI WATCHES/WARNINGS/ADVISORIES...
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PA...None. NJ...Frost Advisory until 9 AM EDT Wednesday for NJZ020>022-027. DE...None. MD...None. MARINE...None.
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&& $$ Synopsis...Miketta Near Term...MPS Short Term...O`Hara Long Term...Miketta Aviation...Meola/Miketta/MPS/O`Hara Marine...Miketta/MPS/O`Hara

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