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-- Discussion containing changed information from previous version are highlighted. --
000
FXUS61 KPBZ 231038
AFDPBZ

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PITTSBURGH PA
638 AM EDT THU MAY 23 2013

.SYNOPSIS...
SHOWER AND THUNDERSTORM CHANCES WILL CONTINUE UNTIL A FRONT CROSSES
THE REGION THIS EVENING. MUCH COOLER WEATHER CAN BE EXPECTED FOR
THE WEEKEND.

&&

.NEAR TERM /UNTIL 6 PM THIS EVENING/...
CONVECTIVE THRESHOLDS WL BE CONSIDERABLY LOWER TDA AS THE UPR
TROF SLIDES EWD. WITH CONVECTIVE TEMPS PROGGED IN THE MID TO UPR
60S...AND WITH OVRALL ASCENT INCRSG...SCT MRNG SHWRS ARE EXPECTED
TO BECOME MORE NMBRS...HENCE POPS WERE INCRSD TO LIKELY NMBRS AND
TSTM MENTION WAS MAINTAINED.

DESPITE A RELATIVELY STRONG WIND FIELD...SEVERE POTENTIAL IS LOW
GIVEN THE OVRALL INSTABILITY LIMITATIONS.

NR TERM TEMPS WERE FORECAST USING TWEAKED LAMP GUIDANCE.

&&

.SHORT TERM /6 PM THIS EVENING THROUGH SATURDAY/...
-- Changed Discussion --
THE CDFNT WL COMPLETE A SWEEP OF THE REGION TNGT...BUT CHC POPS
WERE MAINTAINED INTO FRIDAY GIVEN THE PRESENCE OF THE MID/UPR
TROF. BLDG HIGH PRES SHOULD SUPPRESS THOSE RESIDUAL CHCS BY FRIDAY
AFTN.

ISSUE THEREAFTER IS OF TEMPS AS DVLPMNT OF A HIGH AMPLITUDE ERN
CONUS TROF SPPRTS STRNG COLD ADVCTN. SHOULD SFC WIND DIMINISH
SUFFICIENTLY...PTCHY FROST IS PSBL BY DAYBREAK SATURDAY.

SHORT TERM TEMPS WERE FORECAST USING A BLEND OF PERSISTENCE AND
SREF MEANS.
-- End Changed Discussion --

&&

.LONG TERM /SATURDAY NIGHT THROUGH WEDNESDAY/...
DRY WEA IS EXPD THRU THE PERIOD WITH HIGH PRESSURE IN CONTROL. A
WRMFNT MAY APRCH BY MID WEEK BUT TOO MUCH UNCERTAINTY TO INCLUDE
ANY PCPN MENTION ATTM. TEMPS WL START OUT BLO AVG OVR THE
WEEKEND...THEN MODERATE TO SEASONAL LVLS AS HIGH PRESSURE SHIFTS E
OF THE AREA AND FLOW TURNS SRLY.

&&

.AVIATION /12Z THURSDAY THROUGH MONDAY/...
-- Changed Discussion --
MVFR CIGS ARE POSSIBLE FOR A BRIEF TIME THIS MORNING BEFORE
LIFTING TO VFR AT ALL PORTS. SHOWERS WILL DEVELOP AGAIN THIS
AFTERNOON...WITH A CHANCE OF THUNDERSTORMS AS WELL. CONFIDENCE IN
TSTMS IS NOT HIGH ENOUGH TO INCLUDE IN TAFS. AS A COLD FRONT
APPROACHES THE AREA THIS EVENING...WIND GUSTS ARE EXPECTED TO PICK
UP AS WELL AS THE ARRIVAL OF MVFR CIGS. WINDS WILL VEER TO THE
NORTHWEST BEHIND THE FRONT...AND WIDESPREAD IFR CONDITIONS ARE
EXPECTED AFTER MIDNIGHT.

.OUTLOOK.../FRIDAY THROUGH MONDAY/...
RESTRNS ARE LIKELY WITH REMAINING SHWRS INTO FRIDAY...BUT BLDG
HIGH PRES WL QUICKLY RTN VFR TO AREA PORTS BY AFTN. GENL VFR WL
THEN PERSIST INTO EARLY NEXT WEEK.
-- End Changed Discussion --

&&

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

&&

$$