Area Forecast Discussion
Issued by NWS Mt. Holly, NJ

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000 FXUS61 KPHI 230348 AFDPHI Area Forecast Discussion National Weather Service Mount Holly NJ 1148 PM EDT Wed Mar 22 2017 .SYNOPSIS... Large high pressure across the upper Great Lakes region this evening will slide southeast and crest over our region on Thursday. A warm front will lift to our northwest Friday, while a backdoor cold front pushes through the area Saturday. This front is forecast to stall near the southern portions of the area or just to our south into early next week. A couple of low pressure systems may form along the boundary and move eastward as well. && .NEAR TERM /UNTIL 6 AM THURSDAY MORNING/... Clear skies on tap as high pressure builds in from the west. Winds continue to diminish through the overnight. No significant changes to forecast, but will make some tweaks based on latest surface obs. Strong radiational cooling conditions likely late in the overnight which could result in temps possibly a few degrees colder than forecast. We could get close to record lows (see climate section below). && .SHORT TERM /6 AM THURSDAY MORNING THROUGH 6 PM THURSDAY/... High will pass almost directly overhead leading to light and variable winds for much of the region. Despite the sunny conditions, temperatures will remain 10 to 15 degrees below normal as the continental Polar air mass will be entrenched over the region. && .LONG TERM /THURSDAY NIGHT THROUGH WEDNESDAY/... High pressure will have moved east of the area by Thursday night. A warm front will inch towards the area from the west causing clouds to increase over the region. Rains and some mixed precipitation will arrive across the far N/W Friday morning. The models seem to be a bit slower with the arrival time, and this could make the difference in p-type with even a few hours later favoring more rain over mixed. We will continue with a mention of some sleet/freezing rain attm. Other than that, mostly rain N/W with low likely pops by afternoon over the srn Poconos. Limited clouds/precip S/E with temperatures near 60 degrees by afternoon. The weekend looks to be a split with Sat being the better weather day and Sunday looking rather wet. The front will remain to the north Sat with only small chc or slgt chc pops across the far north. The front then sags southward Sunday while low pressure moves along it and approaches from the West. We will carry low likely pops in most areas Sunday. Temperatures well above normal Saturday with 60s north and low 70s South/east. Readings closer to normal Sunday. Unsettled conditions early next week with an upper low and sfc front lingering across the area. We will carry chc pops for both Monday ad Tuesday with this fcst. The north/west counties will be favored for the better chcs for measurable rain. Temperatures early next week should remain a little above normal for late March. && .AVIATION /04Z THURSDAY THROUGH MONDAY/... The following discussion is for KPHL, KPNE, KTTN, KABE, KRDG, KILG, KMIV, KACY and surrounding areas. VFR through the TAF period with unlimited CIGs/VSBYs. NW winds less than 10 KT in most locations, but winds will diminish to less than 10 KT where winds are still 15-20 KT with gusts to 25 KT. OUTLOOK... Thu night...In general VFR. Low clouds psbl far NW late. Fri...VFR most areas but restrictions psbl with rain and a chance for sleet and freezing rain far N/W Fri morning. Fri night and Sat...mostly VFR. Sat night thru Monday...Showers. restrictions for CIG and VSBY psbl. && .MARINE... SCA conditions on S DE Bay, DE ocean waters, and NJ ocean waters through Thursday morning. There is a chance for light freezing spray through Thursday morning. Still considerable uncertainty as by the time the air temperature gets cold enough to support freezing spray, winds will be dropping off. OUTLOOK... Thursday night...sub-SCA conditions expected. Fri-Fri night...SCA conditions likely on the ocean. Sub-SCA on Del. Bay. Showers mostly north. Sat-Sat night...Conditions diminishing below SCA conditions. Sun-Mon...SCA expected on the Ocean. Sub- SCA on Del Bay. Showers. && .CLIMATE... One or 2 of the following are vulnerable record equaling lows Thursday morning March 23, primarily ABE. Others are listed for reference ACY-13 1875 PHL-14 1885, 1875 ILG-14 1934 ABE-13 1934 TTN-13 1934 GED-16 1959 RDG-14 1906 MPO- minus 8 1912 && .PHI WATCHES/WARNINGS/ADVISORIES... PA...None. NJ...None. DE...None. MD...None. MARINE...Small Craft Advisory until 6 AM EDT Thursday for ANZ450>453. Small Craft Advisory until 4 AM EDT Thursday for ANZ431-454- 455. && $$ Synopsis...Drag/O`Hara Near Term...Drag/Johnson/MPS Short Term...Johnson Long Term...O`Hara Aviation...Drag/Johnson/O`Hara Marine...Drag/Johnson/O`Hara Climate... is the U.S. government's official web portal to all federal, state and local government web resources and services.