Area Forecast Discussion
Issued by NWS Mt. Holly, NJ
Issued by NWS Mt. Holly, NJ
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430 FXUS61 KPHI 152351 AFDPHI Area Forecast Discussion National Weather Service Mount Holly NJ 751 PM EDT Wed May 15 2024 .SYNOPSIS... An area of low pressure will remain offshore of the Mid Atlantic coast through Friday, before drifting out to sea. High pressure tries to build down into the area from the northeast over the weekend, but never fully makes it into the area before another area of low pressure moves across the central Appalachians and offshore of the North Carolina coast later Sunday into Sunday night. Weak high pressure may finally build across the area early next week, before a cold front moves across the east coast by mid week. && .NEAR TERM /THROUGH THURSDAY/... As of 6:10PM...Occluding surface low pressure remains centered just offshore of Delmarva and southern NJ. Light rain and drizzle continues for areas across the region along with some light patchy fog. The occluding surface low pressure just offshore of the region this evening will stall through tonight and into Thursday. Chances for precipitation will diminish slightly with time tonight as the low nudges just a little to the east/northeast, but overall things will basically stay the same. Expect overcast skies tonight with areas in NJ and near the coast seeing continued drizzle or light rain. Some areas may see some patchy fog into Thursday morning, but any widespread dense fog is not expected. For Thursday, not a lot of change is expected as the low will be drifting out to sea but only very slowly. This will keep it mainly cloudy with breezy north to northeast winds and some spotty light rain and showers around, once again, especially in NJ and near the coast. Western parts of the forecast area from around Berks County northward into the Lehigh Valley should see a mostly dry day. Expect highs mostly in the 60s (near 60 at the coast) except some low 70s possible in our western zones from Chester and north through Berks Counties and then into parts of the Lehigh Valley. && .SHORT TERM /THURSDAY NIGHT THROUGH FRIDAY/... Low pressure remains pinwheeling offshore of the Mid Atlantic coast Thursday night through Friday, before finally moving out to sea Friday night. There might be a few lingering showers near the New Jersey coast early Thursday night, but the forecast dries out for Friday as high pressure tries to begin nosing down into the area from the northeast. Most of Friday night should remain dry as well, except possibly late in the overnight showers may begin to move in from the west. && .LONG TERM /FRIDAY NIGHT THROUGH WEDNESDAY/... Unsettled weather can be expected for portions of the area this weekend, especially for the southern third of the area from southern New Jersey, Delaware, and eastern Maryland. As an area of low pressure will move across the central Appalachians, then offshore of the North Carolina coast Saturday into Sunday, a warm front will lift northward, but remain south of the area. However, there will be enough moisture and lift across the area for periods of showers to develop across the southern areas. High pressure tries to build down from the north, but never fully sets in, but it may have enough effect on the area to keep the weather mostly dry for the northern portions area; however, there will remain a chance of showers even for northern areas given the proximity of the low and front to the south. By early next week, the low pressure to the south will begin to drift out to sea, while high pressure briefly affects the Mid Atlantic region. Dry weather is expected Monday into Tuesday. As we move into next Wednesday, a cold front is forecast to move into the eastern seaboard, bringing an increase in shower chances. && .AVIATION /00Z THURSDAY THROUGH MONDAY/... The following discussion is for KPHL, KPNE, KTTN, KABE, KRDG, KILG, KMIV, KACY and surrounding areas... Tonight...Mostly MVFR expected for sites, though periods of IFR likely for KACY/KMIV. KRDG/KABE will likely flirt with VFR conditions at times. Some lingering spotty light rain, drizzle and mist/fog for I-95 sites and eastward, especially for KACY. NE winds 10-15 kts backing N during the first half of the period. Low confidence. Thursday....Mainly MVFR cigs throughout the day. N to NE winds 10-15 kts with some gusts to around 20 kts. Moderate confidence. Outlook... Thursday night...IFR then MVFR conditions expected with a chance of showers. Friday-Saturday...VFR conditions expected. Saturday night...VFR conditions early, then MVFR or IFR ceilings overnight with a chance of showers. Sunday-Sunday night...MVFR or IFR conditions with a chance of showers. Monday...Conditions improving to VFR. && .MARINE... North to northeast winds will remain fairly strong over the waters into this evening before starting to come down somewhat by later tonight into Thursday. Remaining Gale conditions off the coast of NJ (Gale Warnings in effect) should diminish to SCA levels from south to north through tonight. Small Craft Advisory levels conditions over the Delaware Bay diminishing this evening. Seas 6 to 10 feet through most of tonight diminishing to 5 to 7 feet by later Thursday. Outlook... Thursday night...Small Craft Advisory level seas likely continue through the night, but winds diminish below advisory levels during the overnight. Friday...Small Craft Advisory levels seas may continue into Friday. Friday night-Saturday night...Conditions remain below advisory levels. Sunday-Monday...Small Craft Advisory conditions possible, mainly due to seas although winds could gust around 20 knots. && .PHI WATCHES/WARNINGS/ADVISORIES... PA...None. NJ...None. DE...None. MD...None. MARINE...Small Craft Advisory until 10 PM EDT this evening for ANZ430- 431. Gale Warning until 4 AM EDT Thursday for ANZ450. Gale Warning until 10 PM EDT this evening for ANZ451. Small Craft Advisory until 6 AM EDT Friday for ANZ452>455. && $$ SYNOPSIS...Robertson NEAR TERM...Fitzsimmons/Wunderlin SHORT TERM...Robertson LONG TERM...Robertson AVIATION...Fitzsimmons/Robertson/Wunderlin MARINE...Fitzsimmons/Robertson/Wunderlin