FXUS61 KPBZ 281540
AFDPBZ
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PITTSBURGH PA
1040 AM EST SAT NOV 28 2009
.SYNOPSIS...
HIGH PRESSURE BUILDING IN TODAY WILL BRING DRY WEATHER THROUGH
THE WEEKEND. A COLD FRONT PASSING ACROSS THE DISTRICT MONDAY
WILL BRING A CHANCE OF SHOWERS.
&&
.NEAR TERM /THROUGH TONIGHT/...
15Z 500MB RUC ANALYSIS INDICATES A BROAD RIDGE EXTENDING ACROSS
MUCH OF THE CNTRL CONUS...WITH THE LOCAL AREA ON ITS ERN
PERIPHERY. AT THE SURFACE...A 976 MB LOW IS EXITING THE NORTHEAST
OFF THE COAST OF MAINE. A 1022 MB HIGH IS LOCATED ACROSS SOUTHEAST
ALABAMA...WITH A RIDGE OF HIGH PRESSURE EXTENDING NEWD INTO WRN
PA. A DEEP LAYER OF DRY OF DRY AIR IS ADVECTING INTO THE AREA FROM
THE WEST. THIS IS ALLOWING FOR CLEARING SKIES BEHIND A STRATOCU
DECK EXITING THE CWA.
THIS AFTERNOON AND TONIGHT...THE DEEP LAYER OF DRY AIR WILL SET
INTO THE AREA AS HIGH PRESSURE CONTINUES TO BE THE DOMINANT
FEATURE ACROSS THE AREA. THIS WILL ALLOW FOR CLEAR SKIES
THROUGH THE MAJORITY OF THIS PERIOD. WITH THE PRESSURE GRADIENT
WEAKENING ACROSS THE AREA...WINDS WILL BE LIGHT AND SRLY. LOWS
OVERNIGHT WERE LOWERED A FEW DEGREES FURTHER...AROUND 5-7 DEGREES
BELOW MAV/MET GUIDANCE TONIGHT...WITH THE INFLUENCE OF FROM UPSTREAM
OVERNIGHT LOWS AND THE CORE OF COOLER TDS ADVECTING EWD ACROSS THE
AREA OVERNIGHT.
&&
.SHORT TERM /SUNDAY THROUGH SUNDAY NIGHT/...
HIGH PRESSURE WILL BRING DRY WEATHER FOR SUNDAY ALONG WITH MODERATING
TEMPERATURES. A COLD FRONT PUSHING INTO THE OHIO VALLEY SUNDAY NIGHT
WILL BRING SOME INCREASING CLOUDINESS.
&&
.LONG TERM /MONDAY THROUGH FRIDAY/...
A COLD FRONT WILL PUSH ACROSS THE DISTRICT MONDAY MORNING AND BRING
A CHANCE OF SHOWERS. COLDER TEMPERATURES CAN BE EXPECTED BEHIND THE
FRONT MONDAY NIGHT INTO TUESDAY. ANOTHER SHORT WAVE MOVING INTO
THE DISTRICT LATE WEDNESDAY WILL SPREAD RAIN ACROSS REGION
WEDNESDAY NIGHT INTO THURSDAY WITH A STRONG COLD FRONT SWEEPING THROUGH
THE DISTRICT BY THURSDAY EVENING. COLD AIR MOVES INTO REGION THURSDAY
NIGHT INTO FRIDAY WITH RAIN SHOWERS CHANGING TO SNOW SHOWERS.
&&
.AVIATION /15Z SATURDAY THROUGH WEDNESDAY/...
PREVAILING MVFR CIGS WILL CONTINUE OVERNIGHT. AS HIGH PRESSURE
BEGINS TO BUILD IN THIS MORNING...CIGS WILL GRADUALLY LIFT TO VFR FROM WEST
TO EAST THIS MORNING INTO EARLY AFTERNOON.
VFR CONDITIONS ARE EXPECTED TO THEN CONTINUE INTO SUNDAY. A COLD
FRONT WILL CROSS THE REGION MONDAY MORNING BRINGING THE NEXT CHANCE FOR
REDUCED CONDITIONS INTO MONDAY. VFR IS THEN EXPECTED AGAIN FOR
MONDAY NIGHT INTO TUESDAY. A SYSTEM MOVING NORTHEAST UP THE COAST
WILL BRING THE NEXT POTENTIAL FOR REDUCED CONDITIONS WEDNESDAY.
&&
.PBZ WATCHES/WARNINGS/ADVISORIES...
MD...NONE.
OH...NONE.
PA...NONE.
WV...NONE.
&&
$$
