Area Forecast Discussion
Issued by NWS State College, PA

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000 FXUS61 KCTP 242008 AFDCTP AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE STATE COLLEGE PA 308 PM EST SAT JAN 24 2015 .SYNOPSIS... ANOTHER WEAK UPPER TROF WILL BRING COLDER AIR TO CENTRAL PA TONIGHT...ALONG WITH SNOW SHOWERS FOR WESTERN AND NORTHERN SECTIONS. AN ALBERTA CLIPPER WILL TRACK JUST SOUTH OF PENNSYLVANIA SUNDAY NIGHT WITH ANOTHER WEAKER CLIPPER TAKING THE SAME PATH MONDAY NIGHT AND EARLY TUESDAY. HIGH PRESSURE WILL BUILD OVER THE REGION MID WEEK...FOLLOWED BY ANOTHER CLIPPER LATE THURSDAY. && .NEAR TERM /UNTIL 6 AM SUNDAY MORNING/... A PARADE OF NORTHERN STREAM SHORTWAVES WILL MAINTAIN AN ACTIVE WINTRY PATTERN OVER CENTRAL PA FOR THE FORESEEABLE FUTURE. AS OUR EARLY WEEKEND STORM CONTINUES TO SCOOT OFFSHORE...A WEAKER UPPER LEVEL TROF WILL SPREAD ADDITIONAL SNOW SHOWERS AND LIGHT ACCUMS INTO THE WEST TONIGHT...GENERALLY ALONG AND WEST OF THE ALLEGHENY FRONT. THE 5H SHEAR AXIS ASSOCIATED THIS THIS UPPER TROF WILL BE ALIGNED FROM NORTHWEST TO SOUTHEAST FROM LAKE SUPERIOR TO THE DEL MARVA PENINSULA BY 12Z SUNDAY...WHILE A VIGOROUS UPPER TROF DROPS THROUGH THE UPPER MIDWEST TO THE MID MISSISSIPPI VALLEY. PASSAGE OF SHORTWAVE THIS EVENING SHOULD PRODUCE -SHSN ACROSS THE ALLEGHENY PLATEAU WITH A SMALL ACCUM OF AN INCH OR LESS. LATE TONIGHT...SHORTWAVE PASSES EAST OF THE STATE...CAUSING -SHSN TO TAPER OFF OVR THE NW MTNS. HOWEVER...RESIDUAL UPSLOPE FLOW INTO THE LAURELS WILL KEEP THE -SHSN GOING DOWN THERE. A DOWNSLOPING WEST WIND SHOULD RESULT IN NOTHING MORE THAN FLURRIES EAST OF THE MTNS TONIGHT. WIDESPREAD STRATOCU SHOULD HOLD READINGS UP TONIGHT WITH LOWS IN THE 20S. && .SHORT TERM /6 AM SUNDAY MORNING THROUGH 6 PM SUNDAY/... LITTLE CHANGE FROM PREVIOUS EXPECTED ON SUNDAY. SOME LIGHT OROGRAPHIC SNOW MAY BE ONGOING SUNDAY MORNING ACROSS THE LAUREL HIGHLANDS. WILL CONTINUE TO FOCUS ON THE APPROACHING POTENT CLIPPER WHICH PROMISES TO BRING ANOTHER LIGHT TO LOCALLY MODERATE SNOW ACCUMULATION. THIS TIME IT`S THE LAURELS MOST SHARPLY FOCUSED IN ITS CROSS HAIRS FOR SUNDAY NIGHT INTO MONDAY. && .LONG TERM /SUNDAY NIGHT THROUGH SATURDAY/...
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CLIPPER WILL BRING SOME SNOW TO THE AREA LATE SUNDAY AFT INTO MONDAY MORNING. ENERGY WILL QUICKLY TRANSFER TO THE COASTAL LOW DURING THE DAY ON MONDAY. EXPECT THE HEAVIEST SNOW ACROSS THE SOUTH CENTRAL PART OF THE STATE...GIVEN NW TO SE WARM FRONT. THUS LAUREL HIGHLANS WILL LIKELY SEE HIGHEST AMTS. DID EDGE POPS AND AMTS UP A LITTLE ACROSS THE SE...TO FIT IN BETTER WITH LWX. ALSO DID UP POPS ON TUESDAY. CONCERN IS THAT INVERTED TROUGH COULD KEEP SNOW ACROSS THE WEST INTO TUE...AND COASTAL STORM THAT DEEPENS EXTREMELY FAST MAY WRAP SNOW AROUND TO THE WEST SIDE...A CONCERN FOR THE EAST AND SE. BLOCKING HIGH TO THE NORTH. STILL A LITTLE EARLY FOR AN ADVISORY ACROSS THE SOUTH. TIGHT TEMP GRAIDENT BETWEEN NY AND MD...SOME ADJUSTMENTS TO TEMPS MONDAY INTO TUE. WED STILL LOOKS LIKE A DRY DAY. ANOTHER FRONTAL SYSTEM FOR LATE THU.
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&& .AVIATION /20Z SATURDAY THROUGH THURSDAY/...
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LOW PRESSURE NEAR THE DELMARVA PENINSULA THIS MORNING WILL TRACK QUICKLY NORTHEAST TODAY. AN ALBERTA CLIPPER WILL TRACK JUST SOUTH OF PENNSYLVANIA SUNDAY NIGHT WITH ANOTHER WEAKER CLIPPER TAKING THE SAME PATH MONDAY NIGHT AND EARLY TUESDAY. STRONGER LOW LEVEL WESTERLY FLOW WILL KEEP WINDS UP AROUND 10-15 MPH IN THE WESTERN HIGHER TERRAIN TONIGHT...WITH 850MB WINDS INCREASING TO 35-45 KTS OVER THE SW HALF OF CWA...SO ADDED MENTION OF LLWS THERE. THIS IS ASSOCIATED WITH A WEAK SHORTWAVE THAT WILL ALSO SPAWN LIGHT SNOW SHOWERS WITH VSBY REDUCTIONS TONIGHT IN SAME AREA. COULD BE AN OCCASIONAL ENCROACHMENT INTO THE CENTRAL MTNS OF MVFR CIGS...WHILE SOUTHEAST REMAINS VFR. A PROLONGED PERIOD OF RESTRICTIONS LIKELY SUNDAY NIGHT INTO MON NIGHT AS ANOTHER CLIPPER LOW MOVES THROUGH. OUTLOOK... SUN...VFR INTO THE AFTERNOON...THEN SNOW DEVELOPING ACROSS THE WEST IN THE AFTERNOON OR EVENING...AND OVERSPREADING ALL OF CENTRAL PENN AND THE SUSQ VALLEY AT NIGHT. MON...AM SNOW WITH WIDESPREAD MVFR TO IFR LIKELY. TUE...SOME SNOW LIKELY TO LINGER...ESPECIALLY ACROSS THE WEST AND EAST. WED...NO SIG WEATHER EXPECTED. THU...MORE SNOW EXPECTED WITH NEXT FRONT.
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&& .CTP WATCHES/WARNINGS/ADVISORIES... NONE. && $$ SYNOPSIS...DEVOIR NEAR TERM...DEVOIR SHORT TERM...DEVOIR LONG TERM...MARTIN AVIATION...DEVOIR/MARTIN/RXR

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