Area Forecast Discussion
Issued by NWS Mt. Holly, NJ

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000 FXUS61 KPHI 221624 AFDPHI Area Forecast Discussion National Weather Service Mount Holly NJ 1224 PM EDT SUN MAY 22 2016 .SYNOPSIS... Low pressure well off the New Jersey coast this morning will continue to track out to sea today. It will be followed by another low Monday and Monday night. A ridge will build over our region for Tuesday and Wednesday. The ridge will remain to the east of the area into the weekend while a few weak disturbances will affect the Middle Atlantic region. && .NEAR TERM /UNTIL 6 PM THIS EVENING/...
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The model guidance continues to highlight areas just to our west and south with the best chance for shower activity during the course of the afternoon. This is due to the presence of the trough axis and lower heights along with steepening mid level lapse rates. The main short wave that will allow the trough to become closed off by late in the day is forecast to track to our south. As this occurs, some drying may try to work in from the north. This all spells for a tricky forecast regarding the details as our western and southern zones may be very close to the pop gradient. We used a model blend to try and capture this a bit better, which results in the highest pops around the edges of the CWA during the day. Recent radar trends have shown a decrease in shower activity, so pops have been reduced for the next couple of hours. If enough breaks in the cloud cover can develop then perhaps additional shower activity or even some low topped convection can occur. This looks like a higher chance to our west and south. Therefore we will continue with no thunder mention. As for the high temperatures, we have seen a quick rise in temperatures over the hour or so as breaks in the cloud cover begin to form across the region. This gives a good portion of Central NJ and Southeast PA a chance to reach 70. Clouds and showers across Northern NJ and the Delmarva will keep highs in the 60`s.
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&& .SHORT TERM /6 PM THIS EVENING THROUGH 6 AM MONDAY/... The persistent upper-level trough becomes more closed off as the synoptic pattern is of an omega block. The closed off portion of this trough is forecast to track to our south tonight. This should take the bulk of the forcing with it with lingering showers across the western and then the far southern areas waning during the evening hours. We are still expecting a decent amount of cloud cover although the ceilings may rise some from north to south. The extent of any clearing though will determine if some fog can develop given the moist ground and light winds. As of now, any fog that may form overnight looks to be localized and therefore a mention was not included at this time. As for the low temperatures, we used mainly a MOS/continuity blend. The temperatures may be slow to fall especially where cloud cover is more notable for awhile. && .LONG TERM /MONDAY THROUGH SATURDAY/... The H5 heights across the east will be at their lowest at the beginning of the long term with a cut-off low across the VA cape region. The first sfc low from the near term will have moved off into the Atlantic while a second low will be deepening well offshore and moving northward well east of the area. The continuation of low level moisture and cooler temps aloft will keep the area unsettled with sct showers and afternoon tstms for mon and into tue. pops are generally in the chc range. temperatures will be below normal Monday and close to normal Tuesday. There will likely be more sunshine on Tue with dryer air beginning to arrive across the area. The Tue night thru Thu period will be mostly dry with sfc and upper high pressure affecting the area. We have continued with a small chc for an afternoon TSTM across the far n/w areas Thu afternoon. Temperatures will be above normal thru the period with highs reaching the low 80s in many areas Wed and then low and mid 80s for Thu. Humidity levels will be mostly comfortable thru the period...however a trend toward higher dew points will be under way. It could be muggy across the Delmarva by Thu afternoon. The mild temperatures will continue for the end of the ween and into the weekend. Highs will mostly be in the 80s each day except across the Srn. Poconos and along the shore. Chc for showers and Tstms exist for both Fri and Sat...although the activity will be sct and will be more of the typical summer-time variety. && .AVIATION /16Z SUNDAY THROUGH THURSDAY/...
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The following discussion is for KPHL, KPNE, KTTN, KABE, KRDG, KILG, KMIV, KACY and surrounding areas. This afternoon: VFR with some ceilings becoming broken. Isolated showers can`t be ruled out. variable winds under 10 knots. Tonight...VFR ceilings, possibile window from 09-13z Monday for some patchy fog with lower ceilings and VSBYS, highest chances at KRDG and KMIV. Outlook... Monday thru Tuesday...vfr or mvfr with sct showers/tstms mostly during the afternoons. fog possible mon night. Tue night thru Thu...Mostly vfr. Sct tstms n/w thu afternoon. some fog possible during the overnight periods.
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&& .MARINE... Low pressure will continue to move farther out to sea today, allowing the pressure gradient to relax. The winds have already diminished across much of the area already. As the wind diminishes through the day the direction will become variable across the waters. The seas however remain elevated across much of the Atlantic coastal waters, however they continue to be slow in building passed 3 feet across the far north. We will continue the Small Craft Advisory as is (through at least tonight) mainly for elevated seas. The conditions are expected to remain below advisory criteria on Delaware Bay through tonight. RIP CURRENTS...There is a moderate risk of rip currents today. Northerly winds will be less and also become variable this afternoon, however a higher swell height into most beaches should lead to an elevated risk for the formation of dangerous rip currents. outlook...The last of the SCA conditions across the srn coastal waters Monday. near SCA seas possible Tue across the ocean with the second low out to sea. Mostly sub-sca Tue night-Thu. && .PHI WATCHES/WARNINGS/ADVISORIES... PA...None. NJ...None. DE...None. MD...None. MARINE...Small Craft Advisory until 6 PM EDT Monday for ANZ452>455. Small Craft Advisory until 6 AM EDT Monday for ANZ450-451. && $$ Synopsis...O`Hara Near Term...Gaines/Gorse Short Term...Gorse Long Term...O`Hara Aviation...Gaines/O`Hara Marine...Gorse/O`Hara

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