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Area Forecast Discussion
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000
FXUS61 KPBZ 221055
AFDPBZ

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PITTSBURGH PA
655 AM EDT WED OCT 22 2014

.SYNOPSIS...
SHOWER POTENTIAL WILL CONTINUE TO DIMINISH AS UPPER LOW PRESSURE
EXITS EASTWARD. A STRENGTHENING HIGH WILL DRY AND WARM THE UPPER
OHIO VALLEY REGION INTO NEXT WEEK.

&&

.NEAR TERM /THROUGH TONIGHT/...
MINOR TWEAKS TO THE NR TERM GRIDS BASED ON OBS AND RADAR FOR THE
PRE DAWN UPDT.

PREVIOUS DISC...MATURATION OF LOW PRES IS STILL MDL PROGGED OVR
THE COAST BY DAYS END AND OVRALL SBSDNC WL GRADUALLY SUPPRESS
CONVECTIVE POTENTIAL OVR MOST OF THE UPR OH VALLEY AREA...ALTHOUGH
SLGT SHWR CHCS MAY LINGER INTO EVE OVR THE RIDGES WITH THE SHARPER
UPSLOPE ASSISTANCE.

COLD TEMPS WL LINGER THOUGH AS COLD...TO NEUTRAL ADVCTN CONTS ON
THE REAR FLANK OF THE EXITING LOW. TEMPS ABOUT 10 DEGREES UNDR THE
AVGS WERE MASSAGED USING SREF MEANS AND BIAS CORRECTED GFS MOS.

&&

.SHORT TERM /THURSDAY THROUGH SATURDAY/...
SHRTWV RIDGING IS FORECAST TO SUPPRESS RMNG PCPN CHCS TNGT...AND
INTO FRIDAY.

THEREAFTER...NAM...GFS...AND ECMWF HAVE CONSISTENTLY DEPICTED THE
APCH...AND PASSAGE OF A WEAK SHRTWV IN NW FLOW ON FRIDAY. GIVEN
DEPICTIONS OF A LTD MID LVL MSTR FIELD...CAPPED LOW LVLS AFTR MID
LVL WARMING...AND AN ABSENT PCPN SPPRTG OMEGA FIELD...HAVE DECIDED
TO ELIMINATE THE ALREADY SLGT POP FORECAST IN FAVOR A STRENGTHENING
DRY TREND.

ANOTHER SUCH DISTURBANCE IS PROJECTED FOR A SATURDAY CROSSING...BUT
THE RAIN POTENTIAL LKS EQUALLY SLIM GIVEN SIMILIAR LIMITATIONS AS
FRIDAY AS WELL AS A MORE NWD TRACK OF THE LOW CNTR.

SHORT TERM TEMPS FEATURE MODERATION TWD THE SEASONAL AVGS...FORECAST
FOR WAS TWEAKED AGAIN USING BIAS CORRECTED GFS MOS AND SREF MEANS.

&&

.LONG TERM /SATURDAY NIGHT THROUGH TUESDAY/...
RIDGING ACRS THE CNTRL CONUS WL MOVE TO THE ERN CONUS THRU ERLY
NXT WK KEEPING DRY WEA IN THE FCST. A WKNG TROF IS PROGGED FOR A
MID WK PASSAGE AS THE RIDGE SHIFTS E. SEASONALLY COOL WKEND TEMPS
ARE EXP TO INCR TO ABV AVG LVLS BY ERLY NXT WK.

&&

.AVIATION /12Z WEDNESDAY THROUGH SUNDAY/...
WDSPRD MVFR CONDS ARE EXPD INTO TNGT WITH LLVL MOISTURE IN PLACE
UNDER AN UPR LOW ACRS THE RGN. ENOUGH DRY AIR SHOULD MOVE IN THIS
EVE TO ALLOW SOME CLRG W AT ZZV...AND OVRNGT ACRS AREAS FM PIT W.
CLRG AT ZZV MAY BE ERLY ENOUGH TO ALLOW FOR SOME MVFR FG TO DVLP
LT TNGT. 

.AVIATION /THURSDAY THROUGH SUNDAY/...
RSTRNS ARE EXPD INTO THU MRNG BEFORE THE UPR LOW EXITS THE RGN.

&&

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

&&

$$

15/07





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