Skip Navigation Linkswww.nws.noaa.gov 
NOAA logo - Click to go to the NOAA homepage National Weather Service Forecast Office   NWS logo - Click to go to the NWS homepage
Pittsburgh, PA banner image
 
 

Area Forecast Discussion
Latest Versions  [Current][-1][-2][-3][-4][-5][-6][-7][-8][-9]



000
FXUS61 KPBZ 172343 AAB
AFDPBZ

AREA FORECAST DISCUSSION...UPDATED
NATIONAL WEATHER SERVICE PITTSBURGH PA
643 PM EST WED DEC 17 2014

.SYNOPSIS...
IT WILL BE CLOUDY WITH NEAR SEASONAL TEMPERATURES THROUGH THE END
OF THE WEEK.

&&

.NEAR TERM /THROUGH THURSDAY/...
COLD ADVECTION IS WELL UNDERWAY ACROSS THE CWA...AND AS FLOW
TRENDS MORE TOWARD THE NORTHWEST OVERNIGHT WITH THE LOW LEVEL
UNSTABLE MOIST LAYER BEGINNING TO INTERSECT THE LOWER PORTION OF
THE DENDRITIC GROWTH ZONE...SNOW SHOWERS AND FLURRIES SHOULD START
TO BECOME A BIT MORE COMMON TOWARD MIDNIGHT. THIS WILL BE
PARTICULARLY TRUE ALONG AND NORTH OF I-80 AS WELL AS IN THE RIDGES
AS THE NORTHWESTERLY FLOW BECOMES MORE FAVORABLE FOR SUCH
DEVELOPMENT. FLURRIES WILL BE POSSIBLE ANYWHERE IN THE CWA OWING
TO THE AIR MASS CHANGE AND STILL STRONG ADVECTION WITH UNSTABLE
BOUNDARY LAYER...HOWEVER THE BEST CHANCES WILL BE UP NORTH AND IN
THE RIDGES. ACCUMULATIONS ANYWHERE SHOULD BE FAIRLY MINIMAL AS
SHALLOW MOISTURE AND POOR LIFT ALONG WITH SOME DEGREE OF RIMING
SHOULD YIELD POOR QPF AND NO BETTER THAN CLIMO SNOW TO LIQUID
RATIOS. AS A RESULT...EVEN IN THE FAVORED AREAS...REALLY ONLY
ABOVE A HALF AN INCH OF SNOW IS EXPECTED OVERNIGHT. FRIES

&&

.SHORT TERM /THURSDAY NIGHT THROUGH SATURDAY/...
FAST MOVING SHORTWAVE WILL KEEP CLOUDS AND A FEW SNOW SHOWERS
MAINLY ACROSS THE NORTH THURSDAY NIGHT...ENDING EARLY FRIDAY AS
SURFACE RIDGE NOSES INTO THE REGION. WEAK SOUTHERN STREAM SYSTEM
WILL APPROACH LATE SATURDAY WITH CHC POPS ACROSS THE FAR SOUTH FOR
LIGHT SNOW. BULK OF MOISTURE WITH THIS SYSTEM WILL REMAIN WELL
SOUTH OF THE REGION AS IT QUICKLY SHIFTS EAST BY EARLY SUNDAY.

&&

.LONG TERM /SATURDAY NIGHT THROUGH WEDNESDAY/...
THE LONG TERM PD IS PROGGED TO FEATURE REDVLPMNT OF HIGHER
AMPLITUDE FLOW OVR THE CONUS AS A TROF DIGS OVR THE PLNS AND
DEEPENS EWD. INITIAL SEASONAL TEMPS FOR THE UPR OH REGION ARE THUS
EXPECTED TO MODERATE AS WARM ADVCTN INTENSIFIES ON THE ERN FLANK
OF THAT SYSTEM. LATE PD POP TRENDS WL BE DEPENDANT ON PLACEMENT
AND PROGRESS OF THE MID/UPR LOW CNTR...VERY QNABLE GIVEN THE
CUTOFF CURRENTLY FORECAST BY MODEL WORLD. IN GENL...WPC GUIDANCE
WAS USED WITH TWEAKS FOR COLLABORATIVE THRESHOLDS.

&&

.AVIATION /00Z THURSDAY THROUGH MONDAY/...
GENL MVFR...AND PERIODIC IFR FOR NRN PORTS...CAN BE EXPECTED FOR
THE TAF PD AS STRATOCU BLANKET IS MAINTAINED OVR THE UPR OH REGION
VIA COLD ADVCTN AT THE TOP OF THE BNDRY LYR. ANOTHER SHOT OF COLD
AIR TONIGHT WILL ALSO BRING THE THREAT FOR SNOW SHOWERS/FLURRIES...
PARTICULARLY AT NORTHERN PORTS. 


OUTLOOK.../TUESDAY NIGHT THROUGH SUNDAY/... PERIODIC CIG
RESTRICTIONS ARE EXPECTED UNTIL BNDRY LYR FLOW BACKS ON SATURDAY
IN ADVN OF LOW PRES. THAT SYSTEM IS FORECAST TO INTIATE ANOTHER
ROUND OF GENL RESTRICTIONS BY SATURDAY NGT.

&&

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

&&

$$






National Weather Service
Disclaimer Privacy Policy