Area Forecast Discussion
Issued by NWS Mt. Holly, NJ

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059 FXUS61 KPHI 271328 AFDPHI Area Forecast Discussion National Weather Service Mount Holly NJ 928 AM EDT FRI MAY 27 2016 .SYNOPSIS... High pressure off the middle Atlantic coast will settle over our region through the weekend, gradually giving way to a cold front, that is expected to move through our area Tuesday. Canadian high pressure is expected to settle over our region by mid week, while a persistent area of low pressure lurks off the southeast coast. && .NEAR TERM /UNTIL 6 PM THIS EVENING/...
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High pressure off the coast will continue to influence our weather today. The circulation around the high will keep our region in a southerly flow of very warm and humid air. We are expecting a good deal of sunshine for today even with the development of afternoon cumulus. Maximum temperatures around 90 degrees are anticipated except in the elevated terrain and along the coast. The focus for the greatest instability in our vicinity is forecast to develop from around Lancaster County and Berks County up into the Poconos during the afternoon. Mixed layer CAPE values may rise into the 1500 to 2000 J/kg range there. As a result, we anticipate that any convective development this afternoon will be in that area. The potential for rain will decrease to less than 15 percent toward the coast. Dew point readings will remain in the 60s for this afternoon. Precipitable water values should be around 1.6 to 1.7 inches. The steering winds will be relatively light so any thunderstorms that develop should be slow moving leading to the potential for locally heavy rainfall.
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&& .SHORT TERM /6 PM THIS EVENING THROUGH 6 AM SATURDAY/... Any late day convection should diminish and end by midnight. Otherwise fair and mild. Looks like haze and/or patchy fog early tomorrow morning with the fog in your typical spots...northwest NJ and also vcnty KRDG and KMIV. Min temps about 10 to 15F above normal. Forecast basis: a 50 50 blend of the 00z/27 GFS/NAM MOS. && .LONG TERM /SATURDAY THROUGH THURSDAY/...
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The main story will continue to be above average temperatures thru Sunday with high temperatures near 90 degrees, as well as uncomfortable humidity levels into early next week. Temps will remain above average into the middle of next week The main uncertainty will be the interaction between an approaching cold front early next week and an early season tropical/sub-tropical system modeled to develop in the Bahamas. The models continue the trend of drawing a plume of moisture northward along the east coast, with PW values nearing 2.00 inches, or 2 to 3 Standard Deviations above normal by Monday. With the approach of a cool front and weak steering currents aloft, there is the potential for heavy downpours on Monday. Otherwise, there is a chance of diurnally driven showers and thundershowers Saturday and Sunday. For Saturday, this activity should be focused northwest of I-95, while Delmarva may see an increase in activity by late Sunday. A cold frontal passage is anticipated Tuesday, with a drying trend for Wednesday and Thursday. But with low pressure off the southeast US coast, this front may get hung up close to our region, which would lead to a more pessimistic forecast.
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&& .AVIATION /13Z FRIDAY THROUGH TUESDAY/...
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The following discussion is for KPHL, KPNE, KTTN, KABE, KRDG, KILG, KMIV, KACY and surrounding areas. Today...VFR with sct-bkn aoa 5000 ft. South to southwest wind gusting around 15-18 kt during the afternoon. Chance of a shower or tstm but not in the TAFS till more convinced of nearby passage of any convection. For now we have prob30 of a mdt afternoon shower in KRDG and KABE. Tonight...VFR to start . Any evening convection diminishes and ends early and am thinking mostly north of our TAF sites. Patchy IFR conditions in stratus/fog anticipated near 09z/28 vcnty KABE/KRDG, otherwise a bit hazy early Saturday morning. Light south to southwest wind. OUTLOOK... Predominantly VFR during the day through the period, with MVFR possible Sunday night thru Monday night.
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&& .MARINE...
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No marine headlines through tonight. Southerly flow persists...at times gusty to 15 or 20 kt. Seas generally 1-3 ft. More conservative NWPS wave heights were used for this 330AM forecast. OUTLOOK... Winds and seas are expected to remain below SCA criteria during the Saturday thru Tuesday time frame. Some maritime fog is possible Sunday night. RIP CURRENTS: Issued low risk for the formation of dangerous rip currents except for Monmouth County - moderate. Gusty southerly winds to around 20 mph late in the day may enhance the rip current risk elsewhere along the NJ coast. Warmer than normal temperatures, appears to be one part of the recipe for heightened surf zone danger. Another part: unguarded beaches. Be smart and safe. Unless you`re an accomplished swimmer... unguarded beach swimming is ill advised. The water temperatures were still only in the lower 60s southern NJ and Delaware Atlantic coasts, and the upper 50s along much of the northern NJ coast.
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&& .CLIMATE... The record maximum temperature today at allentown is 91, set in 1991 and 1965. It should be near record this afternoon. All other record maximum temperatures in our county warning area (CWA) for May 27 appear out of reach. && .PHI WATCHES/WARNINGS/ADVISORIES... PA...None. NJ...None. DE...None. MD...None. MARINE...None. && $$ Synopsis...Franck Near Term...Iovino Short Term...Drag Long Term...Franck Aviation...Drag/Franck Marine...Drag/Franck Climate...Drag

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