FXUS61 KPBZ 260745
AFDPBZ
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PITTSBURGH PA
245 AM EST THU NOV 26 2009
.SYNOPSIS...
AN APPROACHING COLD FRONT WILL BRING A CHANCE OF SHOWERS TODAY. SNOW
SHOWERS MAY BE EXPECTED TONIGHT AND FRIDAY AS MUCH COLDER AIR
MOVES OVER THE REGION BEHIND THE COLD FRONT.
&&
.NEAR TERM /THROUGH TONIGHT/...
A SLOW MOVING COLD FRONT WILL PUSH ACROSS THE DISTRICT TODAY BRINGING
A CHANCE OF SHOWERS AND CLOUDY SKIES. MUCH COLDER AIR WILL PUSH IN
BEHIND THE FRONT TONIGHT WITH RAIN SHOWERS CHANGING TO SNOW
SHOWERS. NORTHWEST FLOW SETTING UP BEHIND THE FRONT WILL BRING
LAKE EFFECT SNOWS SHOWERS TONIGHT THAT MAY BRING SIGNIFICANT
SNOW ACCUMULATION TO THE RIDGES AND LAKE EFFECT COUNTIES TO
THE NORTH. A SNOW ADVISORY WILL LIKELY BE ISSUED LATER TODAY
FOR THESE REGIONS FOR LATE TONIGHT INTO FRIDAY.
&&
.SHORT TERM /FRIDAY THROUGH FRIDAY NIGHT/...
THE GREATEST RISK FOR SNOW ACCUMULATION WILL BE CENTERED OVER
COUNTIES IN LEE OF THE LAKES AND ESPECIALLY OVER RIDGE ZONES WHERE
UPSLOPE ENHANCEMENT AND MID LEVEL COLD POOL SHOULD SUPPORT
ACCUMULATING SNOW AND POSSIBLE ADVISORIES FOR FRIDAY. SNOW SHOWERS
WILL CONTINUE INTO FRIDAY NIGHT WITH TEMPERATURES REMAINING BELOW
NORMAL.
&&
.LONG TERM /SATURDAY THROUGH WEDNESDAY/...
BY SATURDAY HIGH PRESSURE BUILDING INTO THE DISTRICT WILL WEAKEN
THE NORTHWEST FLOW AND BRING AN END TO THE SNOW SHOWERS. HIGH
PRESSURE PUSHING EAST WILL BRING DRY WEATHER FOR SATURDAY NIGHT
INTO SUNDAY. A LOW PRESSURE SYSTEM WILL COME FROM THE LOWER
MISSISSIPPI VALLEY AND SPREAD RAIN SHOWERS ACROSS THE UPPER VALLEY
MONDAY AND TUESDAY...WHICH SHOULD BE EXITING WEDNESDAY.
EXPECT TEMPERATURES NEAR NORMAL THIS PERIOD BASED ON HPC AND GFS
MOS GUIDANCE.
&&
.AVIATION /08Z THURSDAY THROUGH MONDAY/...
EXPECT PREDOMINATELY VFR CONDITIONS THROUGH 06Z FRIDAY WITH CEILINGS
BETWEEN 3000 AND 5000 FEET...BUT MVFR RESTRICTIONS ARE POSSIBLE IN
SCATTERED SHOWERS THROUGH EARLY TONIGHT.
AS COLDER AIR BEHIND A COLD FRONT MOVES INTO THE REGION TONIGHT...
SCATTERED RAIN SHOWERS WILL CHANGE OVER TO SNOW SHOWERS AND
CONDITIONS WILL GENERALLY LOWER TO MVFR. GREATEST COVERAGE OF SNOW
SHOWERS SHOULD BE ACROSS THE NORTH AT KDUJ AND KFKL....WHERE BRIEF
IFR PERIODS ARE POSSIBLE IN HEAVIER SNOW SHOWERS LATE THURSDAY NIGHT
THROUGH FRIDAY NIGHT.
HIGH PRESSURE WILL PROVIDE PREVAILING VFR CONDITIONS FOR SATURDAY
AND SUNDAY. REDUCED CONDITIONS WILL AGAIN BE POSSIBLE SUNDAY NIGHT
AND MONDAY AS ANOTHER LOW PRESSURE SYSTEM AFFECTS THE AREA.
&&
.PBZ WATCHES/WARNINGS/ADVISORIES...
MD...NONE.
OH...NONE.
PA...NONE.
WV...NONE.
&&
$$
