FXUS61 KPBZ 011606
AFDPBZ
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PITTSBURGH PA
1106 AM EST TUE DEC 1 2009
.SYNOPSIS...
CLOUDS MAINLY NORTH OF PITTSBURGH WILL DECREASE THIS AFTERNOON AND
SURFACE HIGH PRESSURE MOVES EAST. A LOW PRESSURE SYSTEM WILL THEN
BRING RAIN FOR WEDNESDAY AFTERNOON INTO THURSDAY WITH COLDER
TEMPERATURES FOR THE WEEKEND.
&&
.NEAR TERM /THROUGH TONIGHT/...
CLEARING LINE IS ACROSS NORTHERN ALLEGHENY COUNTY WITH CLOUDS
NORTH AND EAST IN MEAN NORTHWEST FLOW THROUGH 700MB. MEAN FLOW
WILL BECOME MORE WEST TO SOUTHWEST BY LATE DAY WITH CLOUDS
DISSIPATING IN THE NORTH BY LATE DAY. CLEAR AND DRY TONIGHT UNDER
SURFACE RIDGE. TEMPERATURES NOT TOO FAR FROM NORMAL.
&&
.SHORT TERM /WEDNESDAY THROUGH THURSDAY/...
CLOUDS WILL BE ON THE INCREASE THROUGHOUT THE MORNING WEDNESDAY AS
SURFACE LOW TRACKS NORTH FROM THE GULF COAST UP THE TN VALLEY
WEDNESDAY AND THEN ACROSS OHIO THURSDAY. DEEPEST MOISTURE TO
SUPPORT PRECIP HOLDING OFF UNTIL WEDNESDAY AFTERNOON EXCEPT IN
THE FAR SOUTH. WITH THE PROJECTED TRACK OF THE LOW...PRECIP SHOULD
BE ALL RAIN WEDNESDAY THROUGH THURSDAY. WITH GOOD WAA WEDNESDAY
AHEAD OF THE RAINFALL...EXPECT MAXES TO BE 5 TO 10 DEGREES ABOVE
AVERAGE.
&&
.LONG TERM /THURSDAY NIGHT THROUGH MONDAY/...
DEEP DIGGING CLOSED LOW WILL MOVE FROM NORTHERN PLAINS TO GREAT
LAKES THROUGH PERIOD BRINGING COLDEST AIR OF SEASON WITH OFF AND
ON SNOW SHOWERS DUE TO LAKE EFFECT AND DISTURBANCES MOVING UNDER
CLOSED LOW. NOT MUCH TO ARGUE WITH FROM HPC PROGS AND FOLLOWED.
&&
.AVIATION /16Z TUESDAY THROUGH SATURDAY/...
WEST/NORTHWEST FLOW IMMEDIATLY ABOVE THE BOUNDARY LAYER CONTINUES
TO FLOW ACROSS THE GREAT LAKES TO FUEL THE BLANKET OF MVFR
STRATOCUMULUS WHICH HAS PERSISTED THROUGH THE MORNING ACROSS AREAS
TO THE NORTH OF A BVI, TO PIT, TO LBE LINE. EXPECT THIS AREA OF
CLOUDINESS TO PERSIST WELL INTO THE AFTERNOON BEFORE BACKING WIND
AND WARM ADVECTION IN THE LAYER ABOVE 900 MB ERODES IT.
OTHERWISE, SOUTHWEST WIND ON THE SURFACE AT APPOXIMATELY 10 KT
WILL PREVAIL FOR MOST OF TODAY...WITH A FEW GUSTS TO 18-20KT CONTINUING.
HIGH PRESSURE WILL BUILD OVER THE REGION FOR THE OVERNIGHT WITH
VFR CONDITIONS AND LIGHT SOUTHERLY WIND.
MID LEVEL CLOUDINESS WILL BE INCREASING ON WEDNESDAY AS LOW
PRESSURE EMERGES FROM THE DEEP SOUTH. THAT SYSTEM IS PROGGED TO
CROSS THE UPPER OHIO ON WEDNESDAY, BRINGING RESTRICTIONS IN RAIN.
REDUCED CONDITIONS MAY BE EXPECTED INTO THE WEEKEND AS COLD
ADVECTION IN THE WAKE OF THAT SYSTEM SUPPORTS POTENTIAL SNOW
SHOWERS AND STRATOCUMULUS.
&&
.PBZ WATCHES/WARNINGS/ADVISORIES...
MD...NONE.
OH...NONE.
PA...NONE.
WV...NONE.
&&
$$
