Hail and Damaging Winds in Pennsylvania, August 8, 2007

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PITTSBURGH PA
1040 AM EDT WED AUG 8 2007

.SYNOPSIS...
A FRONTAL BOUNDARY WILL REMAIN ACROSS THE UPPER OHIO VALLEY
THROUGH FRIDAY WITH A WAVE MOVING ALONG THE FRONT THURSDAY
INTO THURSDAY NIGHT. HOT AND HUMID CONDITIONS WILL CONTINUE
UNTIL THE COLD FRONT PUSHES EAST OF THE REGION ON FRIDAY. COOLER
AND LESS HUMID CONDITIONS CAN BE EXPECTED FOR THE WEEKEND AS
HIGH PRESSURE BUILDS IN BEHIND THE COLD FRONT.

&&

.NEAR TERM /THROUGH TONIGHT/...
ISSUED A HEAT ADVISORY FROM THE PIT METRO SOUTH...AS TEMPS WILL
CLIMB INTO THE LOWER 90S...AND WITH DEWPOINTS IN THE LOWER
70S...HEAT INDICES WILL TOP OUT BETWEEN 98 AND 102. ANOTHER WEAK
WAVE IN WESTERLY FLOW ALOFT WILL CROSS THE AREA THIS
AFTN/EVENING...GENERATING ANOTHER ROUND OF ISOLATED/SCATTERED
SHOWERS AND THUNDERSTORMS. HOT/HUMID CONDITIONS WILL CONTINUE TO
PREVAIL...WITH HEAT INDEX VALUES BETWEEN 95 AND 100 DEGREES THIS
AFTERNOON.

&&

.SHORT TERM /THURSDAY THROUGH THURSDAY NIGHT/...
A VERY WARM AND MOIST AIR MASS WILL REMAIN SETTLED OVER THE
REGION. SOUTHERLY FLOW WILL KEEP THE AREA UNDER HAZY, HOT AND
HUMID CONDITIONS THROUGH THE PERIOD. AN UPPER LEVEL DISTURBANCE
WILL BRING INSTABILITY TO THE REGION THURSDAY INTO THURSDAY NIGHT
BRINGING A RISK FOR SHOWERS AND THUNDERSTORMS MAINLY IN THE
AFTERNOON AND NIGHT TIME HOURS.

&&

.LONG TERM /FRIDAY THROUGH TUESDAY/...
HIGH PRESSURE WILL MOVE INTO THE REGION BEHIND THE STRONG SYSTEM
MOVING THROUGH ON FRIDAY. THIS WILL PROVIDE LESS HUMID AND MORE
SEASONAL TEMPERATURES. THE POSSIBILITY OF RAIN WHILE WE ARE UNDER
THIS HIGH PRESSURE WILL BE VERY SMALL SO WILL NOT INCLUDE IN THE
FORECAST AT THIS TIME.

&&

.AVIATION /12Z WEDNESDAY THROUGH MONDAY/...

LOW END VFR/MVFR CONDITIONS WILL PREVAIL IN HAZE THROUGH
TODAY. AREAS OF IFR/LIFR ACROSS THE NORTHERN DISTRICTS WILL
LIFT BY MIDDAY. AREAS OF MVFR WILL PREVAIL IN/NEAR SHOWERS AND
THUNDERSTORMS THIS AFTN/EVE. FOR THURSDAY THROUGH EARLY
FRIDAY...THE FRONTAL BOUNDARY WILL MOVE BACK OVER THE AREA...WITH
A SFC LOW LOVING ALONG THE FRONT. SCATTERED TO NUMEROUS TSTMS
WILL DEVELOP BY THURSDAY AFTN...WITH A GREATER COVERAGE OF
MVFR/OCCASIONAL IFR CONDITIONS. VFR CONDITIONS WILL BUILD IN
FOR THE WEEKEND...AS THE FRONT FINALLY EXITS TO THE SOUTH.

&&

.PBZ WATCHES/WARNINGS/ADVISORIES...
MD...NONE.
OH...HEAT ADVISORY FOR OHZ039>041-048>050-057>059-068-069
     UNTIL 8 PM THIS EVENING.
PA...HEAT ADVISORY FOR PAZ020-021-029>032 UNTIL 8 PM THIS EVENING.
WV...HEAT ADVISORY FOR WVZ001>004-012-021-022 UNTIL 8 PM THIS
     EVENING.

&&

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE PITTSBURGH PA
129 PM EDT WED AUG 8 2007

OHZ039>041-048>050-057>059-068-069-PAZ020-021-029>032-WVZ001>004-012-
021-022-091730-
TUSCARAWAS-CARROLL-COLUMBIANA-COSHOCTON-HARRISON-JEFFERSON OH-
MUSKINGUM-GUERNSEY-BELMONT-NOBLE-MONROE-BEAVER-ALLEGHENY-WASHINGTON-
WESTMORELAND-GREENE-FAYETTE-HANCOCK-BROOKE-OHIO-MARSHALL-WETZEL-
MARION-MONONGALIA-
129 PM EDT WED AUG 8 2007

...HEAT ADVISORY IN EFFECT UNTIL 8 PM EDT THIS EVENING...

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

.DAY ONE...THIS AFTERNOON AND TONIGHT

PLEASE LISTEN TO NOAA WEATHER RADIO OR GO TO WEATHER.GOV ON THE
INTERNET FOR MORE INFORMATION ABOUT THE FOLLOWING HAZARDS.

   HEAT ADVISORY.

NATIONAL WEATHER SERVICE SAYS HOT AND HUMID CONDITIONS THIS
AFTERNOON AND EARLY EVENING WILL PRODUCE HEAT INDICES OF 100 TO
104.

THERE IS ALSO A SLIGHT RISK OF SEVERE THUNDERSTORMS THIS AFTERNOON
AND EARLY TONIGHT. THE PRIME THREAT IS DAMAGING WIND. THE
THUNDERSTORMS CAN ALSO PRODUCE HEAVY RAIN. LOCATIONS GETTING MORE
THAN 2 INCHES OF RAIN IN A COUPLE HOURS CAN EXPERIENCE FLOODING
ALONG SMALL STREAMS AND WHERE DRAINAGE IS POOR.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY

THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS FOR THURSDAY INTO
THURSDAY NIGHT. THE PRIMARY SEVERE THREAT WILL BE DAMAGING
THUNDERSTORM WINDS. THE THUNDERSTORMS CAN ALSO PRODUCE HEAVY RAIN.
LOCATIONS GETTING MORE THAN 2 INCHES OF RAIN IN A COUPLE HOURS CAN
EXPERIENCE FLOODING ALONG SMALL STREAMS AND WHERE DRAINAGE IS
POOR.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE NEEDED THIS AFTERNOON AND TONIGHT AND
AGAIN THURSDAY AFTERNOON AND THURSDAY NIGHT.

MDZ001-PAZ007>009-013>016-022-023-WVZ023-041-091730-
GARRETT-MERCER-VENANGO-FOREST-LAWRENCE-BUTLER-CLARION-JEFFERSON PA-
ARMSTRONG-INDIANA-PRESTON-TUCKER-
129 PM EDT WED AUG 8 2007

THIS HAZARDOUS WEATHER OUTLOOK IS FOR WESTERN MARYLAND...NORTHWEST
PENNSYLVANIA...WEST CENTRAL PENNSYLVANIA AND NORTHERN WEST VIRGINIA.

.DAY ONE...THIS AFTERNOON AND TONIGHT

THE NATIONAL WEATHER SERVICE SAYS THERE IS A SLIGHT RISK OF SEVERE
THUNDERSTORMS THIS AFTERNOON AND EARLY TONIGHT. THE PRIME THREAT
IS DAMAGING WIND. THE THUNDERSTORMS CAN ALSO PRODUCE HEAVY RAIN.
LOCATIONS GETTING MORE THAN 2 INCHES OF RAIN IN A COUPLE HOURS CAN
EXPERIENCE FLOODING ALONG SMALL STREAMS AND WHERE DRAINAGE IS
POOR.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY

THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS FOR THURSDAY INTO
THURSDAY NIGHT. THE PRIMARY SEVERE THREAT WILL BE DAMAGING
THUNDERSTORM WINDS. THE THUNDERSTORMS CAN ALSO PRODUCE HEAVY RAIN.
LOCATIONS GETTING MORE THAN 2 INCHES OF RAIN IN A COUPLE HOURS CAN
EXPERIENCE FLOODING ALONG SMALL STREAMS AND WHERE DRAINAGE IS
POOR.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE NEEDED THIS AFTERNOON AND TONIGHT AND
AGAIN THURSDAY AFTERNOON AND THURSDAY NIGHT.

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE PITTSBURGH PA
111 PM EDT WED AUG 8 2007

PAZ031-032-081830-
GREENE-FAYETTE-
INCLUDING THE CITIES OF...WAYNESBURG...FAIRDALE...UNIONTOWN...
CONNELLSVILLE...OHIOPYLE
111 PM EDT WED AUG 8 2007

THROUGH 230 PM...SCATTERED SHOWERS AND THUNDERSTORMS WILL MOVE
SOUTHEAST AT 20 MPH ACROSS NORTHEAST GREENE COUNTY AND FAYETTE
COUNTY. THE STRONGEST STORM WILL AFFECT ANTRAM BY 120 PM AND
FAIRCHANCE BY 2 PM. THIS STORM IS CAPABLE OF PRODUCING WIND
GUSTS TO 45 MPH AND RAINFALL OF OVER ONE INCH.