Severe Thunderstorm Warning 259, NWS Pittsburgh, PA

AREA FORECAST DISCUSSION...UPDATED
NATIONAL WEATHER SERVICE PITTSBURGH PA
1030 AM EDT THU AUG 19 2004

.SHORT TERM (REST OF TODAY)...
FRONTAL BOUNDARY HAS SETTLED TO THE NORTH WITH BAND OF HEAVIER
PRECIP WITH EMBEDDED CONVECTION SETTING UP JUST TO THE SOUTH OF THIS
BOUNDARY. SATELLITE INDICATES OPEN AREA IN THE SOUTHERN HALF OF THE
FORECAST AREA WHERE ETA WANTS TO SET UP FOR POSSIBLE SEVERE WHICH
WOULD TEND TO CUT OFF MOISTURE IN THE NORTH. WILL UPDATE AND INCLUDE
HEAVY RAIN WORDING AS WELL AS SEVERE. MAY BE CONSIDERING FLOOD WATCH
WITH THE AFTERNOON 3PM ISSUANCE. REST LEFT AS IS.
&&

.PREVIOUS DISCUSSION...
THE FOLLOWING WAS ORIGINALLY ISSUED AT 435 AM EDT THU AUG 19 2004

AVIATION
HAVE KEPT TSRA FOR MUCH OF THE DAY WITH NRN AIRPORT EMPHASIS DURING
THE MRNG WITH CURRENT TSRA COMPLEX...FOLLOWED BY PREVAILING
CONDITIONS BY EVE FOR THE SRN PORTS AS FRONT SAGS SWD.  OUTFLOW WL
LIKELY ALTER SITUATION.

SHORT TERM (TODAY)...
THERE IS A SLIGHT CHANCE OF SEVERE THUNDERSTORMS OVER THE REGION
TODAY.  A LARGE AREA OF THUNDERSTORMS IS MOVING THROUGH EAST CENTRAL
OHIO AT THE MOMENT.  SHOWERS AND THUNDERSTORMS WILL CONTINUE TO
THREATEN THE AREA THROUGH THE DAY AS A FRONTAL BOUNDARY STALLS OVER
THE REGION.

LONG TERM (TONIGHT THROUGH WEDNESDAY)...
A SECOND WAVE WILL MOVE OVER THE OHIO RIVER VALLEY THURSDAY NIGHT
BEFORE THE COLD FRONT MOVES EAST ON SATURDAY.  THIS WILL KEEP A
CHANCE OF SHOWERS AND THUNDERSTORMS AROUND UNTIL THE COLD FRONT
PUSHES THROUGH.

A HIGH PRESSURE CENTER MOVES IN AND WILL GIVE THE REGION NICE
WEATHER FOR A FEW DAYS.  INSTABILITY SHOWERS COULD FORM IN THE
AFTERNOON NEXT MONDAY AND TUESDAY.
&&

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

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE PITTSBURGH PA
1040 AM EDT THU AUG 19 2004

MDZ001-OHZ039>041-048>050-057>059-068-069-PAZ007>009-013>016-020>023-
029>032-WVZ001>004-012-021>023-041-200914-
ALLEGHENY PA-ARMSTRONG PA-BEAVER PA-BELMONT OH-BROOKE WV-BUTLER PA-
CARROLL OH-CLARION PA-COLUMBIANA OH-COSHOCTON OH-FAYETTE PA-
FOREST PA-GARRETT MD-GREENE PA-GUERNSEY OH-HANCOCK WV-HARRISON OH-
INDIANA PA-JEFFERSON PA-JEFFERSON OH-LAWRENCE PA-MARION WV-
MARSHALL WV-MERCER PA-MONONGALIA WV-MONROE OH-MUSKINGUM OH-NOBLE OH-
OHIO WV-PRESTON WV-TUCKER WV-TUSCARAWAS OH-VENANGO PA-WASHINGTON PA-
WESTMORELAND PA-WETZEL WV-
1040 AM EDT THU AUG 19 2004

THIS HAZARDOUS WEATHER OUTLOOK IS FOR WESTERN PENNSYLVANIA
EAST CENTRAL OHIO...NORTHERN WEST VIRGINIA AND
GARRETT COUNTY MARYLAND.

.DAY ONE...TODAY

THERE IS A SLIGHT CHANCE OF SEVERE THUNDERSTORMS TODAY. IN ADDITION
THE THUNDERSTORMS WILL CONTAIN VERY HEAVY RAINS.

.DAYS TWO THROUGH SEVEN...

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE REQUIRED.

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE PITTSBURGH PA
1219 PM EDT THU AUG 19 2004

PAZ007>009-013>016-022-023-191914-
ARMSTRONG PA-BUTLER PA-CLARION PA-FOREST PA-INDIANA PA-JEFFERSON PA-
LAWRENCE PA-MERCER PA-VENANGO PA-
1219 PM EDT THU AUG 19 2004

...PERIODS OF HEAVY RAIN EXPECTED THROUGH 3 PM...

THUNDERSTORMS WILL CONTINUE TO MOVE EASTWARD ACROSS THE AREA THROUGH
3 PM. THESE STORMS WILL DUMP PERIODS OF VERY HEAVY RAIN AS THEY MOVE
EASTWARD. SOME AREAS WILL RECEIVE UP TO ONE AND ONE HALF INCHES
THROUGH THE PERIOD. THIS MAY LEAD TO LOCAL PONDING OF WATER AND
DRAINAGE PROBLEMS IN URBAN AREAS.

RESIDENTS SHOULD REMAIN ALERT FOR RAPIDLY CHANGING CONDITIONS AND
FURTHER UPDATES.

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE PITTSBURGH PA
1249 PM EDT THU AUG 19 2004

OHZ040-041-191800-
CARROLL OH-COLUMBIANA OH-
1249 PM EDT THU AUG 19 2004

...PERIODS OF HEAVY RAIN EXPECTED...

THUNDERSTORMS WITH VERY HEAVY RAINS AND FREQUENT LIGHTNING WERE OVER
COLUMBIANA AND CARROLL COUNTIES IN OHIO. SOME COMMUNITIES WILL
RECEIVE UP TO ONE INCHES THROUGH 2 PM. THIS MAY LEAD TO LOCAL PONDING
OF WATER AND DRAINAGE PROBLEMS IN POOR DRAINAGE AREAS.  THE STORMS
WERE MOVING EAST AROUND 20 MPH.

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE PITTSBURGH PA
1259 PM EDT THU AUG 19 2004

..TIME...   ...EVENT...     ...CITY LOCATION...      ...LAT.LON...
..DATE...   ....MAG....     ..COUNTY LOCATION...ST.. ...SOURCE....
            ..REMARKS..

1035 PM     HAIL             7 SE ANTIOCH            39.59N 80.97W
08/18/2004  1.00 INCH        MONROE             OH   SKYWARN SPOTTER

&&

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE PITTSBURGH PA
108 PM EDT THU AUG 19 2004

PAZ014-020-191800-
BEAVER PA-BUTLER PA-
108 PM EDT THU AUG 19 2004

...PERIODS OF HEAVY RAIN EXPECTED...

AT 1 PM NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
THUNDERSTORMS WITH VERY HEAVY RAINS AND FREQUENT LIGHTNING OVER
BEAVER COUNTY. THE STRONGEST STORMS WERE LOCATED IN NORTHERN BEAVER
COUNTY BETWEEN BEAVER FALLS AND NEW GALILEE.   SOME COMMUNITIES WILL
RECEIVE UP TO ONE INCHES THROUGH 2 PM. THIS MAY LEAD TO LOCAL PONDING
OF WATER AND DRAINAGE PROBLEMS IN POOR DRAINAGE AREAS.  THE STORMS
WERE MOVING EAST AROUND 20 MPH. THE STORMS WILL MOVE INTO BUTLER
COUNTY BY 1:20 PM AND MOVE THROUGH COMMUNITIES LIKE CRANBERRY...
BUTLER AND EVANS CITY.

STAY TUNED TO NOAA WEATHER RADIO AND OTHER LOCAL MEDIA FOR FURTHER
DETAILS OR UPDATES.

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE PITTSBURGH PA
152 PM EDT THU AUG 19 2004

..TIME...   ...EVENT...     ...CITY LOCATION...      ...LAT.LON...
..DATE...   ....MAG....     ..COUNTY LOCATION...ST.. ...SOURCE....
            ..REMARKS..

0140 PM     TSTM WND DMG     MARS                    40.70N 80.01W
08/19/2004                   BUTLER             PA   COUNTY EOC

            NUMEROUS TREES DOWN IN AND AROUND MARS.

&&

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE PITTSBURGH PA
158 PM EDT THU AUG 19 2004

PAZ021-022-030-191900-

ALLEGHENY PA-ARMSTRONG PA-WESTMORELAND PA-
158 PM EDT THU AUG 19 2004

...THUNDERSTORMS...

AT 200 PM EDT NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
THUNDERSTORMS ALONG A LINE EXTENDING FROM 4 MILES EAST OF SARVER TO
FREEPORT TO NATRONA HEIGHTS...MOVING EAST AT 45 MPH.  THESE STORMS
WILL CONTAIN STRONG GUSTY WINDS HAIL AND TORRENTIAL DOWNPOURS

LOCATIONS IMPACTED INCLUDE...
  APOLLO...
  CROOKED CREEK LAKE PARK...
  FREEPORT...
  NATRONA HEIGHTS...
  NEW KENSINGTON...
  COMPTON...
  PLEASANTVILLE...

PLEASE REPORT HAIL...STRONG WINDS OR WIND DAMAGE TO THE NATIONAL
WEATHER SERVICE BY CALLING TOLL FREE...1-877-633-6772...WHEN YOU CAN
DO SO SAFELY.