-- Discussion containing changed information from previous version are highlighted. --
000
FXUS61 KPBZ 161449
AFDPBZ

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PITTSBURGH PA
1049 AM EDT THU MAY 16 2013

.SYNOPSIS...
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A COLD FRONT SOUTH OF INTERSTATE 70 WILL PUSH SLOWLY SOUTH THIS
AFTERNOON. THIS BOUNDARY WILL BECOME STATIONARY FRIDAY THEN WAVER OVER
PORTIONS OF THE UPPER OHIO VALLEY INTO THE WEEKEND.
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&&

.NEAR TERM /UNTIL 6 PM THIS EVENING/...
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NEXT BATCH OF SHOWERS MOVING ALONG BOUNDARY ALONG THE MASON DIXON
LINE WILL MAINLY EFFECT PRESTON...GARRETT AND TUCKER COUNTIES AS A
SHORTWAVE PUSHES FRONT A BIT FATHER SOUTH THIS AFTERNOON AND
EVENING. NO MAJOR CHANGES TO GRIDS FROM PREVIOUS EARLY MORNING
UPDATE EXCEPT TOP ADD CLOUDS UP ACROSS PITTSBURGH REGION AS MID
DECK ACROSS OHIO IS RACING EAST OVER TOP OF FRONT. EARLIER
DISCUSSIONS FOLLOW...

SHOWER AND THUNDERSTORM ACTIVITY IS BEGINNING TO DIMINISH AS THE
UPPER LEVEL WAVE MOVES EASTWARD THIS MORNING. MADE ONLY SLIGHT
ADJUSTMENTS TO THE NEAR TERM TO BETTER REFLECT CURRENT RADAR AND
SURFACE OBSERVATIONS. ALSO LOWERED HIGH TEMPERATURES A FEW DEGREES
IN THE SOUTH WITH AMPLE CLOUD COVER AND RAINFALL THIS MORNING.

PREVIOUS DISCUSSION FOLLOWS...
ACTIVITY SHOULD RE-FIRE LATER TODAY IN THE PERIPHERY OF THE
SURFACE BOUNDARY WITH DAYTIME HEATING. NORTH OF THE FRONT...
ATMOSPHERE IS STABLE...WHILE ALONG AND SOUTH OF THE FRONT...
ATMOSPHERE AGAIN BECOMES UNSTABLE WITH SURFACE CAPE VALUES OF 1000
TO 2000 J/KG. BECAUSE OF THIS WILL KEEP POPS CONFINED TO THE SOUTH
TODAY. WOULD ALSO EXPECT MOST OF THE CLOUD COVER ACROSS THE
SOUTH...WITH THE FAR NORTH SEEING PLENTY OF SUNSHINE TODAY.

TEMPS WILL BE WARM TODAY WITH HIGHS IN THE MID TO UPPER 70S.
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&&

.SHORT TERM /6 PM THIS EVENING THROUGH SATURDAY/...
THE FRONT WILL GET A BIT OF A PUSH SOUTH TONIGHT AND FRIDAY WITH
DRY AIR ENCOMPASSING MUCH OF THE REGION. SCATTERED SHOWERS STILL
POSSIBLE ACROSS THE FAR SOUTH. FOR LATER FRIDAY INTO SATURDAY
MODELS AGAIN HAVE SOME DIFFICULTY WITH SHORTWAVE TIMING AND
MOVEMENT BACK NORTHWARD OF THE FRONT ACROSS REGION. WITH
UNCERTAINTY AND LOW CONFIDENCE...FELT IT BEST TO ONLY MAKE MINOR
CHANGES TO THIS PERIOD AND KEEP POPS IN THE CHC TO SCHC RANGE.

&&

.LONG TERM /SATURDAY NIGHT THROUGH WEDNESDAY/...
A SERIES OF DISTURBANCES WILL MOVE TOWARDS THE OHIO VALLEY
THROUGH THE WEEKEND FOLLOWED BY AN APPROACHING TROUGH BY THE END
OF THE LONG TERM PERIOD. MODELS ARE IN AGREEMENT WITH OVERALL
PATTERN BUT DIFFER IN LOCATION OF BOUNDARY ON THE WEEKEND.
SOUTHERN COUNTIES IN THE FORECAST AREA WILL HAVE BEST CHANCE OF
PRECIPITATION. TEMPERATURES WILL GRADUALLY RISE THROUGH THE LONG
TERM PERIOD.

&&

.AVIATION /15Z THURSDAY THROUGH MONDAY/...
SHOWERS AND DISSIPATING THUNDERSTORMS CONTINUE TO SLOWLY SAG
SOUTHEASTWARD NOW GENERALLY SOUTH OF KZZV TO A KLBE LINE AND
SHOULD END AT ALL SITES WITHIN THE MORNING HOURS. CLEARING SKIES
WITH GENERALLY WESTERLY FLOW WILL PREVAIL THROUGH THE DAY BEFORE
WINDS TURN MORE NORTHWEST THIS EVENING. THIS SHOULD BRING IN DRIER
AIR AND PRECLUDE MUCH FOG DEVELOPMENT TONIGHT. FRIES

.OUTLOOK.../THURSDAY NIGHT THROUGH MONDAY/...
RESTRICTIONS ARE EXPECTED WITH SHWRS AND TSTMS ON SUNDAY AND MONDAY.

&&

.PBZ WATCHES/WARNINGS/ADVISORIES...
MD...NONE.
OH...NONE.
PA...NONE.
WV...NONE.

&&

$$