983
FXUS61 KPBZ 020808
AFDPBZ
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PITTSBURGH PA
308 AM EST TUE DEC 2 2008
SYNOPSIS
LIGHT SNOW SHOWERS WILL QUICKLY MOVE EAST THIS MORNING BEFORE WEAK
HIGH PRESSURE BUILDS IN TO DRY OUT CONDITIONS. A COLD FRONT PASSING
THROUGH WEDNESDAY EVENING AND THURSDAY MORNING WILL BRING ANOTHER
ROUND OF PRECIPITATION TO THE AREA.
NEAR TERM /THROUGH TONIGHT/
UPPER LEVEL WAVE HAS PASSED THROUGH THE AREA...AND ONLY EXPECT TO
SEE TRACE ACCUMULATIONS EAST OF PITTSBURGH THIS MORNING. WITH LOW
LEVEL MOISTURE REMAINING THROUGHOUT THE DAY...TEMPERATURES WILL RISE
LITTLE AND CLOUDS WILL REMAIN PREVALENT. LOW LEVEL MOISTURE PUSHES
TO THE NORTHEAST DURING THE EVENING...AND SKIES SHOULD CLEAR OUT
OVERNIGHT. UNDERCUT MODEL GUIDANCE BY A FEW DEGREES FOR THE
OVERNIGHT LOWS AS MODEL GUIDANCE WAS SHOWING SIMILAR LOWS TO LAST
NIGHT EVEN WITH THE CLEARING SKIES.
SHORT TERM /WEDNESDAY THROUGH FRIDAY/
EXPECT PARTLY SUNNY SKIES ON WEDNESDAY IN ADVANCE OF THE APPROACHING
COLD FRONT. MODELS ARE IN VERY GOOD AGREEMENT WITH THE TIMING OF THE
FRONT CLEARING THE RIDGES BY SUNRISE ON THURSDAY...WITH
PRECIPITATION ENDING BY THURSDAY AFTERNOON. WITH A SLIGHTLY FASTER
COLD FRONT PASSAGE...PRECIPITATION WILL START AS RAIN AND EVENTUALLY
TURN OVER TO SNOW. EXPECT MOST LOCATIONS TO RECEIVE ABOUT A QUARTER
INCH OF LIQUID EQUIVALENT. TEMPERATURES WILL LIKELY FALL THROUGHOUT
THE DAY ON THURSDAY AS THE FRONT MOVES THROUGH. IN ADDITION...WINDS
WILL VEER TO THE WEST AND 850MB TEMPS WILL DROP...ALLOWING LAKE
EFFECT SNOWS TO BEGIN AGAIN ALONG THE LAKE ERIE SHORELINE. USUAL
LOCATIONS NORTH OF I-80 AND ON THE RIDGES COULD SEE LIGHT SNOW
ACCUMULATIONS THURSDAY NIGHT AND FRIDAY.
LONG TERM /FRIDAY NIGHT THROUGH MONDAY/
MAINLY DRY BUT COLD CONDITIONS WILL PREVAIL FRIDAY NIGHT INTO
SATURDAY...WITH ANOTHER SYSTEM PROGGED TO BRING SNOW FOR SATURDAY
NIGHT/SUNDAY. MAINLY DRY BUT COLD CONDITIONS WILL PREVAIL NEXT
MONDAY.
AVIATION /08Z TUESDAY THROUGH SATURDAY/
GENERALLY MVFR CEILINGS WITH LIGHT SNOW SHOWERS/FLURRIES WILL
CONTINUE THROUGH THE PREDAWN HOURS AS UPPER TROUGH CROSSES THE
UPPER OHIO VALLEY. SUBSIDENCE UNDER SHORTWAVE RIDGE AND SLIGHTLY
DRIER AIR ADVECTING OVER AREA PORTS IS SUFFICIENT TO SUPPORT A
VFR FORECAST FOR AREA PORTS BY MIDDAY. LOW PRESSURE OVER EASTERN
CANADA WILL CONTINUE TO FILL AND MODERATE WIND GUSTS AS THE
MORNING PROGRESSES; HOWEVER, THAT SITUATION LOOKS TO BE BRIEF WITH
ANOTHER LOW PROGGED TO DIG OVER THE GREAT LAKES WITH SOUTHERLY
SURFACE WIND AGAIN INCREASING ON TUESDAY NIGHT.
EAST COAST HIGH PRESSURE IS EXPECTED TO HOLD THAT SYSTEM IN CHECK
UNTIL THE SYSTEMS COLD FRONT INVADES THE REGION LATE
WEDNESDAY/EARLY THURSDAY. WITH THAT FEATURE WILL COME THE NEXT
CHANCE FOR PRECIPITATION AND FLIGHT RESTRICTIONS. VFR CONDITIONS
ARE PROGGED UNDER BUILDING HIGH PRESSURE TO CLOSE THE WEEK.
PBZ WATCHES/WARNINGS/ADVISORIES
MD...NONE.
OH...NONE.
PA...NONE.
WV...NONE.
15/33
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