000
FXUS61 KPBZ 130013
AFDPBZ

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PITTSBURGH PA
813 PM EDT MON MAY 12 2008

.SYNOPSIS...
HIGH PRESSURE WILL BRING DRY CONDITIONS FOR LATE TONIGHT INTO TUESDAY.
A COLD FRONT WILL CROSS THE THE REGION ON WEDNESDAY WITH A GOOD
CHANCE OF SHOWERS AND THUNDERSTORMS. RAIN CHANCES WILL LINGER
THROUGH THE LATTER HALF OF THE WEEK AS A SERIES OF DISTURBANCES
CROSS THE UPPER OHIO VALLEY.

&&

.NEAR TERM /THROUGH TUESDAY/...
HIGH PRESSURE WILL BUILD IN THE WAKE OF EXITING LOW PRESSURE WITH
DRYING AIR BY DAYBREAK TUESDAY BRINGING CLEARING SKIES AND
CONTINUED BELOW NORMAL TEMPERATURES.

&&

.SHORT TERM /TUESDAY NIGHT THROUGH THURSDAY/...
DRY HIGH PRESSURE TO REMAIN IN CONTROL OF AREA WEATHER INTO
WEDNESDAY MORNING WITH WARMING TEMPERATURES. LOW PRESSURE WILL
CROSS CANADA ON WEDNESDAY WITH THE CENTER PROGGED NEAR THE JAMES
BAY. THAT SYSTEM WILL PULL A COLD FRONT ACROSS THE UPPER OHIO
VALLEY, THUS, SHOWERS AND POSSIBLY SOME THUNDERSTORMS MAY BE
EXPECTED WITH THE FRONT.

SOUTHWARD PROGRESS OF THE FRONT IS IN DOUBT WITH MODEL-WORLD
PROJECTING ANOTHER SHORTWAVE ON THURSDAY. WILL ALLOW FOR A BREAK
IN PRECIP ON WEDNESDAY NIGHT, BUT WILL REINTRO CHANCE POPS ON
THURSDAY WITH BETTER NUMBERS OVER THE SOUTHERN ZONES NEAR THE
PROJECTED FRONTAL POSITION.

&&

.LONG TERM /THURSDAY NIGHT THROUGH MONDAY/...
THIS PERIOD OF UNSETTLED WEATHER WILL CONTINUE THROUGH THE WEEKEND.
A WAVE OF LOW PRESSURE WILL EXIT TO THE EAST EARLY FRIDAY...WITH 
WEAK HIGH PRESSURE BUILDING IN FOR FRIDAY NIGHT INTO SATURDAY. 
ANOTHER LOW PRESSURE SYSTEM WILL SLIDE THROUGH SATURDAY EVENING. YET 
ANOTHER WILL QUICKLY FOLLOW BEHIND SUNDAY INTO MONDAY.

TEMPERATURES WILL RANGE ABOUT 5 TO 10 DEGREES BELOW CLIMO FOR THE 
PERIOD.

&&

.AVIATION /00Z TUESDAY THROUGH SATURDAY/...
DEEPER MOISTURE ASSOCIATED WITH EXITING LOW PRESSURE SYSTEM WILL
DIMINISH THIS EVENING...WITH MVFR CONDITIONS GIVING WAY 
BY DAYBREAK TUESDAY TO VFR. WITH LOW LEVEL MOISTURE LINGERING
OVERNIGHT...SOME PATCY MVFR FOG IS POSSIBLE AROUND DAYBREAK,
ESPECIALLY IN THE RIVER VALLEYS. BUILDING HIGH PRESSURE RIDGE
TUESDAY WILL PROVIDE FOR VFR CONDITIONS TUESDAY THROUGH WEDNESDAY
MORNING. THERE WILL BE A CHANCE FOR IFR TO MVFR WEDNESDAY
AFTERNOON THROUGH WEDNESDAY NIGHT AS A COLD FRONT CROSSES THE
REGION. WEAK HIGH PRESSURE WILL PROVIDE FOR GENERALLY VFR
THURSDAY...WITH A WAVE OF LOW PRESSURE PRESENTING THE CHANCE FOR
IFR CONDITIONS AGAIN THURSDAY NIGHT INTO FRIDAY.

&&

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

&&

$$