Special Weather Statement, NWS Pittsburgh, PA

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PITTSBURGH PA
343 PM EDT THU OCT 18 2012

.SYNOPSIS...
A COLD FRONT WILL MOVE EAST OF THE REGION LATER THIS EVENING
BRINGING COOLER CONDITIONS. IT WILL BE COOLER WITH A CHANCE OF
SHOWERS INTO THE WEEKEND.

&&

.NEAR TERM /THROUGH FRIDAY/...
FRONTAL BOUNDARY HAS CROSSED KPIT AT 19Z AND IS GRADUALLY WORKING
ACROSS THE REGION. MODEL RUNS ARE DEVELOPING A WAVE ALONG THE FRONT
WITH AN UPPER LEVEL SHORTWAVE MOVING NORTHEAST UP THE
APPALACHIANS ON THE FRONT SIDE OF DIGGING CLOSED LOW OVER THE
WESTERN GREAT LAKES.

THIS WILL SLOW THE FRONT THIS EVENING EVENING AS IT APPROACHES
THE RIDGES AND ALLOW FOR A MORE WIDESPREAD AREA OF SHOWERS TO
DEVELOP WITH A FEW THUNDERSTORMS ESPECIALLY ACROSS THE SOUTHEAST RIDGES.

WIND GUSTS HAVE BEEN CLOSE TO 35 MPH WITH FROPA AND EXPECT THIS
TO CONTINUE AS SYSTEM PASSES EAST. A FEW HIGHER GUSTS TO POSSIBLE
IN ANY THUNDERSTORM.

FRONT AND SHOWERS WILL MOVE EAST OF THE RIDGES THIS EVENING.
BEHIND THE FRONT...A LARGE DRY SLOT IS FORECASTED TO DEVELOP WHICH
WOULD ALLOW FOR A DECREASE IN CLOUDS ACROSS REGION WITH COOLER
TEMPERATURES FOR TONIGHT. WINDS WILL DIMINISH QUICKLY THIS
EVENING.

ON FRIDAY DRY SLOT WILL BEGIN TO ERODE AS CLOSED LOW APPROACHES
AND SPREADS CLOUDS AND SHOWERS INTO EASTERN OHIO BY MIDDAY AND THE
REST OF THE REGION BY SUNSET. TEMPERATURES WILL BE A BIT COOLER
THAN TODAY BUT NOT FAR FROM NORMAL.

&&

.SHORT TERM /FRIDAY NIGHT THROUGH SUNDAY/...
LARGE UPPER LEVEL CLOSED LOW WILL ROLL ACROSS THE OHIO VALLEY
THROUGH THE WEEKEND WITH COOL TEMPERATURES AND SHOWERS. FRIDAY
NIGHT COLD ADVECTION AND INCREASING MOISTURE WILL ARRIVE FOR THE
ENTIRE CWA AND CONTINUE INTO SATURDAY NIGHT. SATURDAY WILL BE A
RAW DAY AND FORECAST HIGH TEMPS MAY BE HARD TO REACH. BY SUNDAY
UPPER LEVEL SYSTEM WILL BEGIN TO ROTATE INTO NEW ENGLAND WITH A
DRY DAY BUT STILL ON THE COOL SIDE.

&&

.LONG TERM /SUNDAY NIGHT THROUGH THURSDAY/...
THERE IS ECWMF/GFSE AGREEMENT THAT THE UPPER OHIO VALLEY WILL BE IN
A NORTHWESTERLY MID-LEVEL FLOW TO BEGIN THE PERIOD. A MID-LEVEL
RIDGE WILL THEN BUILD INTO THE AREA FOR MONDAY AND KEEP THE AREA
DRY.

UNCERTAINTY ENTERS THE FORECAST ON TUESDAY AS ALTHOUGH BOTH THE
GFS/ECMWF INDICATE A WEAK LOW PRESSURE SYSTEM MOVING ACROSS THE
GREAT LAKES REGION...THEY VARY ON HOW FAR SOUTH A FRONTAL BOUNDARY
AND ASSOCIATED PRECIPITATION WILL EXTEND. FORECAST LEANS CLOSEST TO
THE ECMWF...WITH CHANCE POPS NORTH OF THE PITTSBURGH METRO AND SCHC
POPS SOUTHWARD FOR TUESDAY AND WEDNESDAY. A SCHC OF SHOWERS
CONTINUES ON THURSDAY WITH UNCERTAINTY REMAINING IN A ZONAL FLOW.

IN ANTICIPATION THAT THE FRONTAL BOUNDARY WILL REMAIN NORTH OF THE
AREA EARLY THIS WEEK...TEMPERATURES THROUGHOUT THIS PERIOD ARE
FORECAST TO BE AROUND 10 DEGREES ABOVE NORMAL.

&&

.AVIATION /20Z THURSDAY THROUGH TUESDAY/...
A COLD FRONT IS MOVING INTO WESTERN PA...BRINGING BRIEF HEAVY
SHOWERS WITH MVFR RESTRICTIONS...A WIND SHIFT TO FROM SOUTHERLY TO
SOUTHWESTERLY...AND WIND GUSTS TO AROUND 35KTS WITH ITS PASSAGE. THE
FRONT WILL REACH KPIT AND NEARBY TERMINALS AROUND 18Z AND PUSH EAST
OF KLBE/KDUJ BY 20Z.

VFR CONDITIONS WILL RETURN TONIGHT INTO EARLY ON FRIDAY AS A DEEP
LAYER OF DRY MOVES ACROSS THE AREA.

.OUTLOOK.../FRIDAY NIGHT THROUGH TUESDAY/...
A CLOSED LOW ACROSS THE GREAT LAKES WILL SWING SCATTERED SHOWERS AND
POSSIBLE RESTRICTIONS ACROSS THE AREA FRIDAY NIGHT INTO SATURDAY.
CEILING RESTRICTIONS WILL BE POSSIBLE SATURDAY NIGHT WITH VFR
CONDITIONS PREVAILING SUNDAY INTO MONDAY AS HIGH PRESSURE BUILDS IN.
THE NEXT CHANCE OF SHOWERS WILL RETURN ON TUESDAY AS A FRONTAL
SYSTEM APPROACHES FROM THE NORTHWEST.

&&

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

&&

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE PITTSBURGH PA
201 PM EDT THU OCT 18 2012

MDZ001-OHZ039>041-048>050-057>059-068-069-PAZ007>009-013>016-020>023-
029-031-073>076-WVZ001>004-012-021>023-041-191800-
GARRETT-TUSCARAWAS-CARROLL-COLUMBIANA-COSHOCTON-HARRISON-
JEFFERSON OH-MUSKINGUM-GUERNSEY-BELMONT-NOBLE-MONROE-MERCER-VENANGO-
FOREST-LAWRENCE-BUTLER-CLARION-JEFFERSON PA-BEAVER-ALLEGHENY-
ARMSTRONG-INDIANA-WASHINGTON-GREENE-WESTMORELAND-WESTMORELAND RIDGES-
FAYETTE-FAYETTE RIDGES-HANCOCK-BROOKE-OHIO-MARSHALL-WETZEL-MARION-
MONONGALIA-PRESTON-TUCKER-
201 PM EDT THU OCT 18 2012

THIS HAZARDOUS WEATHER OUTLOOK IS FOR WESTERN MARYLAND...EAST
CENTRAL OHIO...NORTHWEST PENNSYLVANIA...SOUTHWEST
PENNSYLVANIA...WEST CENTRAL PENNSYLVANIA...NORTHERN WEST VIRGINIA
AND NORTHERN PANHANDLE OF WEST VIRGINIA.

.DAY ONE...THIS AFTERNOON AND TONIGHT.

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY.

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER
CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES.

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SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE PITTSBURGH PA
356 PM EDT THU OCT 18 2012

WVZ021>023-182045-
MARION WV-MONONGALIA WV-PRESTON WV-
356 PM EDT THU OCT 18 2012

...A THUNDERSTORM WILL AFFECT EASTERN MARION...MONONGALIA AND
NORTHWESTERN PRESTON COUNTIES...

AT 352 PM EDT...A THUNDERSTORM WAS LOCATED NEAR CLARKSBURG...MOVING
NORTHEAST AT 40 MPH.

WIND GUSTS TO 50 MPH AND NICKEL SIZE HAIL ARE POSSIBLE WITH THIS
STORM.

  LOCATIONS IMPACTED INCLUDE...
  WORTHINGTON...        FESTUS...             MONONGAH...
  VALLEY FALLS...       BENTONS FERRY...      COLFAX...
  FARMINGTON...         FAIRMONT...           BARRACKVILLE...
  WINFIELD...           GRANT TOWN...         RIVESVILLE...

  HIGHWAYS IMPACTED INCLUDE...
  I-68 IN WEST VIRGINIA BETWEEN MILE MARKERS 1 AND 18.
  I-79 IN WEST VIRGINIA BETWEEN MILE MARKERS 130 AND 160.

PLEASE REPORT SIGNIFICANT WEATHER TO THE NATIONAL WEATHER SERVICE BY
CALLING TOLL FREE...877-633-6772.

LAT...LON 3940 8010 3939 8020 3943 8027 3944 8034
      3972 8009 3972 7967 3944 7989 3941 7989
      3944 7991 3944 7995 3940 8002 3938 8007

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE PITTSBURGH PA
432 PM EDT THU OCT 18 2012

PAZ031-073>076-182115-
FAYETTE PA-FAYETTE RIDGES PA-GREENE PA-WESTMORELAND PA-
WESTMORELAND RIDGES PA-
432 PM EDT THU OCT 18 2012

...SHOWERS AND THUNDERSTORMS WITH GUSTY WIND AND HAIL WILL AFFECT
EAST CENTRAL GREENE...FAYETTE AND WESTMORELAND COUNTIES...

AT 425 PM EDT...SCATTERED SHOWERS AND THUNDERSTORMS WERE DEVELOPING
ALONG A LINE FROM 2 MILES SOUTHEAST OF WEST NEWTON TO BOBTOWN.
THESE CELLS WERE MOVING NORTHEAST AT 35 MPH AND MAY STRENGTHEN
FURTHER.

WIND GUSTS OF 40 TO 50 MPH AND NICKEL SIZE HAIL ARE POSSIBLE WITH
THESE SHOWERS AND STORMS.

  LOCATIONS IMPACTED INCLUDE...
  WEST NEWTON...        NEMACOLIN...          CARMICHAELS...
  BROWNSVILLE...        BOBTOWN...            BELLE VERNON...
  GREENSBORO...         IRWIN...              MASONTOWN...
  FAIRCHANCE...         PERRYOPOLIS...        JEANNETTE...

  HIGHWAYS IMPACTED INCLUDE...
  ROUTE 43 IN PENNSYLVANIA BETWEEN MILE MARKERS 2 AND 7.
  I-70 IN PENNSYLVANIA BETWEEN MILE MARKERS 41 AND 57.
  TOLL 66 BETWEEN MILE MARKERS 0 AND 13.
  I-79 IN PENNSYLVANIA NEAR MILE MARKER 2.
  I-76 BETWEEN MILE MARKERS 60 AND 94.

PLEASE REPORT SIGNIFICANT WEATHER TO THE NATIONAL WEATHER SERVICE BY
CALLING TOLL FREE...877-633-6772.

LAT...LON 3972 7960 3974 8009 4000 7994 4003 7988
      4008 7990 4008 7984 4013 7987 4022 7982
      4023 7978 4023 7980 4059 7961 4052 7945
      4049 7946 4045 7939 4048 7937 4045 7936
      4046 7933 4041 7927 4042 7925 4037 7913

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