Area Forecast Discussion
Issued by NWS Mt. Holly, NJ

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000 FXUS61 KPHI 232121 AFDPHI AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE MOUNT HOLLY NJ 421 PM EST FRI JAN 23 2015 .SYNOPSIS...
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LOW PRESSURE DEVELOPING DEVELOPING ALONG THE NORTHERN GULF COAST THIS AFTERNOON WILL TRACK NORTHEASTWARD AND INSTENSIFY TONIGHT THROUGH SATURDAY. THE LOW WILL BRING A MIX OF WINTRY WEATHER TO OUR AREA AS IT PASSES BY A LITTLE TO OUR SOUTH AND EAST ON SATURDAY. A SECOND LOW PRESSURE MOVING SOUTHEAST OUT OF CANADA WILL BRING A CHANCE FOR SNOW SUNDAY NIGHT INTO MONDAY. COLD HIGH PRESSURE WILL MOVE OVER THE AREA FOR THE MIDDLE OF NEXT WEEK.
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&& .NEAR TERM /UNTIL 6 AM SATURDAY MORNING/...
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WE WILL NOT BE MAKING A GREAT DEAL OF CHANGE TO THE OVERALL FORECAST. WE WILL BE ADJUSTING A FEW DETAILS. IT CONTINUES TO APPEAR AS THOUGH THE LEADING EDGE OF THE PRECIPITATION WILL BE UP TO ABOUT DELAWARE BAY AT 700 PM. THE PRECIPITATION SHOULD OVERSPREAD THE REMAINDER OF OUR FORECAST AREA BY ABOUT MIDNIGHT. IT SHOULD BEGIN AS A MIX OF RAIN AND SNOW IN OUR FAR SOUTH AND THE EVENT WILL LIKELY BEGIN AS ALL SNOW IN THE REMAINDER OF OUR FORECAST AREA BASED ON THE FORECAST SOUNDINGS. THE BEST PERIOD OF LIFT SHOULD PROGRESS FROM SOUTH TO NORTH OVER OUR FORECAST AREA BETWEEN ABOUT MIDNIGHT AND DAYBREAK. THE BEST SNOW GROWTH WILL OCCUR AT THAT TIME. HOWEVER, WARMER AIR WILL CONTINUE TO BUILD OVER OUR REGION, AS WELL, WITH NO BLOCKING HIGH TO OUR NORTH AND NORTHEAST. A TRANSITION THROUGH SNOW TO SLEET TO RAIN IS ANTICIPATED FOR MOST LOCATIONS TO THE SOUTHEAST OF THE INTERSTATE 95 CORRIDOR OVERNIGHT. THE SAME TRANSITION IS EXPECTED ALONG THE INTERSTATE 95 CORRIDOR LATE TONIGHT BUT THERE MAY BE SOME FREEZING RAIN, AS WELL. IT SHOULD BE MAINLY A SNOW EVENT FOR OUR NORTHERN COUNTIES WITH PERHAPS SOME SLEET MIXED WITH THE SNOW, ESPECIALLY SOUTH OF INTERSTATE 78. IT APPEARS AS THOUGH OUR NORTHERN COUNTIES WILL RECEIVE BETWEEN 3 AND 6 INCHES OF SNOW. THE MIX WILL KEEP SNOWFALL AMOUNTS TO 1 TO 3 INCHES IN THE INTERSTATE 95 CORRIDOR AND AN INCH OR LESS TO THE SOUTHEAST. BASED ON THE LATEST FORECAST, WE HAVE REMOVED THE MARYLAND COUNTIES OF QUEEN ANNE`S, TALBOT AND CAROLINE FROM THE WINTER WEATHER ADVISORY. ALSO, WE HAVE REMOVED KENT COUNTY, DELAWARE AND CAPE MAY COUNTY, NEW JERSEY. THOSE LOCATIONS WILL START AS A BRIEF MIX OF RAIN AND SNOW BEFORE GOING TO ALL RAIN WITH LITTLE SNOW ACCUMULATION ANTICIPATED. THE HEAVIEST LIQUID EQUIVALENT AMOUNTS ARE FORECAST TO BE ACROSS OUR SOUTHEASTERN COUNTIES WHERE SOME LOCATIONS COULD RECEIVE CLOSE TO AN INCH OF RAINFALL. THE SURFACE LOW IS ANTICIPATED TO BE OVER GEORGIA THIS EVENING AND OFF THE VIRGINIA COAST AROUND DAYBREAK.
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&& .SHORT TERM /6 AM SATURDAY MORNING THROUGH 6 PM SATURDAY/...
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MOST OF THE PRECIPITATION SHOULD BE OVER BY MID MORNING ON SATURDAY WITH THE EXCEPTION OF A FINAL LOBE OF LIGHT SNOW AND RAIN WHICH SHOULD PASS FROM WEST TO EAST ACROSS OUR REGION FROM LATE MORNING THROUGH MID AFTERNOON. A MID LEVEL TROUGH AXIS IS FORECAST TO SWEEP ACROSS OUR REGION FROM THE WEST DURING THE MID AFTERNOON HOURS, BRINGING AND END TO THE PRECIPITATION. THE SURFACE LOW IS EXPECTED TO MOVE FROM THE WATERS OFF THE DELMARVA IN THE MORNING TO WELL EAST OF CAPE COD LATE IN THE DAY. THE SYSTEM WILL STRENGTHEN AND WE SHOULD EXPERIENCE AN INCREASING NORTH TO NORTHWEST WIND. MAXIMUM TEMPERATURES ARE FORECAST TO BE MAINLY IN THE 30S, EXCEPT ACROSS OUR FAR SOUTH WHERE THEY COULD GET INTO THE LOWER 40S.
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&& .LONG TERM /SATURDAY NIGHT THROUGH FRIDAY/...
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THE LONG TERM PERIOD WILL BE CHARACTERIZED BY CONTINUED TROUGHINESS OVER THE EASTERN US AND MOSTLY BELOW NORMAL TEMPS. SEVERAL SHORTWV TROFS WILL BE MOVG ACROSS THE AREA AS WELL. THE FIRST WILL BE EXITING THE EAST COAST AT THE BEGINNING OF THE PERIOD ON SAT EVENING. ANOTHER WILL FOLLOW SUNDAY NIGHT INTO MONDAY AND IS FCST TO DEEPEN OF THE EAST COAST THROUGH MID WEEK. A THIRD SYSTEM WILL MOVE THROUGH TOWARDS THE END OF THE WEEK. THE SFC LOW ASSOCD WITH THE FIRST SYSTEM SHOULD BE EAST OF CAPE COD AT 00Z SUN AND DEEPENING RAPIDLY AS IT MOVES AWAY TOWARD NOVA SCOTIA. THIS LEAVES OUR AREA IN NW FLOW AND COLD ADVCTN FOR SUNDAY WITH A COLD FRONT MOVING THROUGH ON SUNDAY. THUS SMWHT COLDER AIR WILL BE IN PLACE AHEAD OF THE NEXT SYSTEM. PRECIP...MOSTLY IN THE FORM OF SNOW...SHOULD BEGIN TO OVERSPREAD THE AREA SUNDAY EVENING. PRECIP COULD BEGIN OVER NRN DELMARVA AS A MIX OF RAIN AND SNOW BUT SHOULD CHANGE TO ALL SNOW OVERNIGHT AS THE PRECIP RATE INCREASES AND SOME NOCTURNAL COOLING TAKES PLACE. PERIODS OF SNOW SHOULD CONTINUE INTO MONDAY AS LOW PRESSURE MOVES BY TO OUR SOUTH AND THEN BEGINS TO DEEPEN OFF THE MID-ATLANTIC COAST. THE MOST SIGNIFICANT SNOW COULD OCCUR MONDAY MORNING... ALTO OVERALL AMOUNTS SHOULD BE FAIRLY LIGHT WITH THIS RELATIVELY FAST MOVG SYSTEM...POSSIBLY 2 TO 4 INCHES OVER NRN DELMARVA WITH AMOUNTS DECREASING NWD INTO NJ AND PA. MOST OF THE MODEL GUIDANCE IS SHOWING SNOW AS THE DOMINANT P-TYPE THROUGH THE EVENT...HWVR SRN DE COULD SEE SOME MIXING WITH RAIN. AFTER PRECIP ENDS MONDAY EVE...HIGH PRES AND DRIER AIR WILL GRADUALL MOVE IN FOR MID WEEK. TEMPS WILL BE WELL BELOW NORMAL FOR MID WEEK BUT SHOULD MOVE BACK TOWARD NORMAL FOR THE END OF THE WEEK. ANOTHER SHRTWV AND ASSOCD FRONTAL SYSTEM COULD BRING SOME LIGHT PRECIP THU NIGHT OR FRE BUT FOR NOW THIS IS QUITE UNCERTAIN AND NOT REFLECTED IN THE FCST GRIDS.
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&& .AVIATION /21Z FRIDAY THROUGH WEDNESDAY/...
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CONDITIONS WERE VFR THIS AFTERNOON. MVFR CEILINGS MAY DEVELOP OVER OUR REGION DURING THE EVENING HOURS BEFORE THE PRECIPITATION ARRIVES. THE SNOW IS FORECAST TO GET TO KILG AND KMIV BY 0200Z, TO KPHL/KPNE/KRDG/KACY BY 0300Z, AND TO KABE AND KTTN BY 0400Z. CONDITIONS WILL QUICKLY DROP TO IFR/LIFR WITH THE ARRIVAL OF THE PRECIPITATION. WE ARE ANTICIPATING MAINLY SNOW AT KRDG AND KABE WITH A LITTLE SLEET. IT SHOULD BE A TRANSITION FROM SNOW TO SLEET AND FREEZING RAIN THEN TO RAIN AT KILG, KPHL, KPNE AND KTTN. THE EVENT MAY START AS A BRIEF PERIOD OF SNOW AT KMIV AND KACY BEFORE GOING OVER TO ALL RAIN. A TOTAL OF 3 TO 5 INCHES OF SNOW MAY FALL ON THE AIRFIELDS AT KRDG AND KABE. GENERALLY AN INCH OR TWO OF SNOW IS EXPECTED FOR KILG/KPHL/KPNE/KTTN WITH SOME ICE POSSIBLE, AS WELL. AN INCH OR LESS IS FORECAST TO FALL AT KMIV AND KACY. LINGERING LIGHT PRECIPITATION IS ANTICIPATED FROM MID MORNING SATURDAY INTO THE AFTERNOON HOURS. CONDITIONS SHOULD STAY MOSTLY IN THE IFR RANGE. THE WIND SHOULD BE VARIABLE AT LESS THAN 8 KNOTS UNTIL LATE TONIGHT WHEN A NORTHEAST WIND WILL LIKELY DEVELOP. SPEEDS ARE FORECAST TO INCREASE TO 10 TO 15 KNOTS WITH GUSTS NEAR 20 KNOTS AS THE WIND BACKS TO THE NORTH THEN TO THE NORTHWEST ON SATURDAY. OUTLOOK... SAT NIGHT/SUN...IMPROVING CONDITIONS SAT NIGHT. VFR SUNDAY. SUN NIGHT...CONDITIONS DIMINISHING WITH IFR POSSIBLE AND SNOW BY EARLY MORNING. MON...MVFR/IFR WITH LOWER CIGS/VSBYS IN SNOW. MON NIGHT - CONDITIONS SLOWLY IMPROVING TO MVFR...POSSIBLY VFR LATE. TUE - WED...MOSTLY VFR.
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&& .MARINE...
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WE WILL CONTINUE THE SMALL CRAFT ADVISORY AND WE WILL EXPAND IT TO INCLUDE UPPER DELAWARE BAY. THE ADVISORY WILL BEGIN AT 400 AM SATURDAY AS LOW PRESSURE STARTS TO PASS OFF THE COAST NEAR THE VIRGINIA CAPES. THE LOW IS EXPECTED TO PASS TO THE SOUTHEAST AND EAST OF THE COASTAL WATERS OF DELAWARE AND NEW JERSEY. THE SYSTEM WILL STRENGTHEN AND WIND GUSTS AROUND 30 KNOTS ARE LIKELY. WAVE HEIGHTS ON OUR OCEAN WATERS SHOULD BUILD TO 6 TO 9 FEET. OUTLOOK... STRONG SMALL CRAFT ADVISORY CONDS ARE EXPECTED TO DEVELOP EARLY MONDAY MORNING AND MAY CONTINUE THROUGH WEDNESDAY. SEAS COULD REACH 8 TO 10 FEET IN PERSISTENT NE FLOW.
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&& .PHI WATCHES/WARNINGS/ADVISORIES...
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PA...WINTER WEATHER ADVISORY FROM 10 PM THIS EVENING TO 1 PM EST SATURDAY FOR PAZ054-055-060>062-105. WINTER WEATHER ADVISORY FROM 7 PM THIS EVENING TO 8 AM EST SATURDAY FOR PAZ070-071-101>104-106. NJ...WINTER WEATHER ADVISORY FROM 10 PM THIS EVENING TO 1 PM EST SATURDAY FOR NJZ001-007>010. WINTER WEATHER ADVISORY FROM 7 PM THIS EVENING TO 5 AM EST SATURDAY FOR NJZ016>019. WINTER WEATHER ADVISORY FROM 7 PM THIS EVENING TO 2 AM EST SATURDAY FOR NJZ020>022-027. WINTER WEATHER ADVISORY FROM 7 PM THIS EVENING TO 8 AM EST SATURDAY FOR NJZ012-013-015. DE...WINTER WEATHER ADVISORY FROM 7 PM THIS EVENING TO 5 AM EST SATURDAY FOR DEZ001. MD...WINTER WEATHER ADVISORY FROM 7 PM THIS EVENING TO 5 AM EST SATURDAY FOR MDZ008-012. MARINE...SMALL CRAFT ADVISORY FROM 4 AM SATURDAY TO 10 AM EST SUNDAY FOR ANZ450>455. SMALL CRAFT ADVISORY FROM 4 AM SATURDAY TO 6 AM EST SUNDAY FOR ANZ430-431.
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&& $$ SYNOPSIS...AMC NEAR TERM...IOVINO SHORT TERM...IOVINO LONG TERM...AMC AVIATION...AMC/IOVINO MARINE...AMC/DRAG/IOVINO

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