Area Forecast Discussion
Issued by NWS Mt. Holly, NJ

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033 FXUS61 KPHI 291925 AFDPHI Area Forecast Discussion National Weather Service Mount Holly NJ 325 PM EDT FRI JUL 29 2016 .SYNOPSIS...
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Scattered showers and thunderstorms with locally heavy rainfall will re-develop Saturday afternoon and linger into Monday with a frontal boundary hung up across the mid Atlantic States. High pressure will then bring mainly dry and less humid weather for the remainder of the next work week.
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&& .NEAR TERM /UNTIL 6 AM SATURDAY MORNING/...
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Any isolated showers and thunderstorms this afternoon should dissipate quickly after sunset with the loss of day time heating. The region should stay dry overnight as we remain in between two systems; the off shore low responsible for the Friday morning rain continues to lift further away from the region, while the next upper level short wave trough remains well west of the region (at least through the overnight hours). Winds will be continuing to diminish and shift to southerly late tonight. This, combined with the recent heavy rainfall across portions of the region means we could see patchy fog especially across the axis of heaviest precip in northern Delmarva and the Pine Barrens.
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&& .SHORT TERM /6 AM SATURDAY MORNING THROUGH 6 PM SATURDAY/...
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The upper level trough becomes more defined as it moves closer to the region. As a result, should see an area of precipitation move into the region (exact timing is uncertain by the higher chances look to be in the afternoon). As far as hazards, the primary hazard appears to be heavy rain. Precipitable water values are well above normal, and storm motions look to be quite slow (<15 kts) as the flow is weak. However, with limited focus for surface convergence (at least over our immediate area), not confident that there will be a widespread flooding threat. Thus, not planning to issue a flash flood watch at this time.
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&& .LONG TERM /SATURDAY NIGHT THROUGH FRIDAY/...
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Highlights... * Scattered showers and thunderstorms Saturday night/Sunday with the potential for heavy rainfall and a very localized flood threat * Scattered showers/thunderstorms linger Monday, otherwise much of the next work week will be dry and less humid Details... Saturday night and Sunday... A couple of additional shortwaves will move across our region along with a frontal boundary in the vicinity. The result will be periods of scattered showers and thunderstorms Saturday night into Sunday. Specific timing is uncertain at this point, but Pwats of 2+ inches will bring the potential for locally heavy rainfall. While any flood threat looks very localized, weak low level wind fields may result in slow movement and back building of any thunderstorms, so that will need to be watched. Weak wind fields will also result in a low overall risk for severe weather, but a few strong storms can not be ruled out. Monday... Guidance has trended a bit slower over the past 24 hours. Frontal boundary will still be across our region along with another piece of shortwave energy moving in on Monday. The result will be the continued chance for scattered showers and thunderstorms. Tuesday Through Friday... Large high pressure will be building across the mid Atlantic States. While we can not rule out a few lingering showers Tuesday, mainly dry and less humid weather is expected through Friday. High temps will mainly be in the 80s for much of the next work week.
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&& .AVIATION /19Z FRIDAY THROUGH WEDNESDAY/...
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The following discussion is for KPHL, KPNE, KTTN, KABE, KRDG, KILG, KMIV, KACY and surrounding areas. Through 06Z, mostly VFR conditions are expected with the following exceptions: There is a small chance (20%) that storms could develop near or over the TAF sites through 00Z. Brief MVFR conditions and lightning will be possible with this afternoon`s storms. Also, lower clouds between 2000 and 3000 ft AGL have persisted at TTN, but should scatter out shortly. Between 06 and 12Z: Patchy light fog is possible, generally for TAF sites outside of the Philly metro. MVFR visibilities are possible. After 12Z: rain showers with embedded thunderstorms are expected to move towards the region from west to east. Precip could begin to move into the western TAF sites (KABE, KRDG) after 15Z and Delaware Valley TAF sites (KPHL, KPNE, KILG, and KTTN) after 18Z. Winds will be light through the period, but the direction will shift from north and northeasterly currently, to southerly and southeasterly by mid day tomorrow. Outlook... Saturday night through Monday...Moderate to high confidence. VFR dominates but periods of lower conditions expected in scattered showers and thunderstorms. Tuesday and Wednesday...Moderate to high confidence in mainly VFR conditions.
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&& .MARINE...
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Winds and seas should remain below SCA criteria tonight and tomorrow. Earlier gusts above 20 kts have subsided and will continue to subside through the evening hours. Outlook...Saturday night through Wednesday...A wave of low pressure may result in a brief period of marginal small craft advisory seas across our northern waters Sunday afternoon/early evening. Otherwise, weak pressure gradient should keep winds/seas mainly below small craft advisory thresholds through Wednesday. Main concern for mariners will be the threat of scattered thunderstorms Saturday night through Monday. Rip Currents...The probably risk for the development of dangerous rip currents on Saturday is low.
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&& .CLIMATE... GED: a record daily rainfall of 2.80 inches occurred for the 28th. PHL: heading for top 10 warmest July on record. July avg temp for PHL will be about 80.9F, 8th warmest July in the period of record since 1874. ACY: already is at least 7th wettest July on record with its monthly record of 13.09 set in 1959. The por is back to 1874. Total for the month as of the 28th: 8.35". && .PHI WATCHES/WARNINGS/ADVISORIES... PA...None. NJ...None. DE...None. MD...None. MARINE...None. && $$ Synopsis...Frank Near Term...Johnson Short Term...Johnson Long Term...Frank Aviation...Johnson/Frank Marine...Johnson/Frank Climate...

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