Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2004

Severe Thunderstorm Warning 23, NWS Pittsburgh, PA

May 12, 2004Forest County, Pennsylvania

NWS Pittsburgh, PA issued this severe thunderstorm warning at May 12, 2004, 6:01 PM EDT for Forest County, Pennsylvania. It was in force for 59 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: May 12, 2004, 6:01 PM EDT (22:01 UTC)
Expired: May 12, 2004, 7:00 PM EDT
In force: 59 min
Issued by: NWS Pittsburgh, PA
Area: Counties, with a storm outline in the text

County Forest County, PA

The radar

The State College radar (KCCX), 122 km from the middle of the area, began a volume at 22:00 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The nearest sounding before it

Pittsburgh, PA (KPIT), launched 12:00Z, 10.0 hours before the alert went out and 142 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 353 J/kg
Mixed-layer CIN: -46 J/kg
Mixed-layer LCL: 968 m above ground
0-6 km bulk shear: 17 kt
0-1 km storm-relative helicity: 54 m²/s²
0-3 km storm-relative helicity: 67 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Pittsburgh, PA wrote its last area forecast discussion before this severe thunderstorm warning went out at May 12, 1:55 PM EDT, 4 hours 6 minutes earlier.

Area forecast discussion, May 12, 1:55 PM EDT, 4 hours 6 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PITTSBURGH PA
155 PM EDT WED MAY 12 2004

.MESOSCALE/THUNDERSTORM DISCUSSION

SLOW MOVING THUNDERSTORMS DEVELOPING.  LEFT OVER BOUNDARIES MAY
PROVIDE A FOCUS POINT FOR ADDITIONAL THUNDERSTORMS THIS EVENING
PROGRESSES. GIVEN HIGH PRECIPITABLE WATER VALUES (1.3 TO 1.4 INCHES)
LOW FLASH FLOOD GUIDANCE AND THE POTENTIAL TO HAVE STORMS REMAIN
NEARLY STATIONARY ALONG THAT BOUNDARY, WE WILL MONITOR THE POTENTIAL
FOR FLASH FLOOD PRODUCING STORMS.
&&

.EARLY PERIOD DISCUSSION...
CONTINUED WARM/UNSTABLE REGIME IN SW FLOW ON BACKSIDE OF BERMUDA
HIGH PARKED OFF EAST COAST. CONTINUED DIURNAL CONVECTION- ANY STORMS
WILL BE SLOW MOVING.  COLD FRONT EXPECTED TO MOVE TOWARDS REGION
LATE FRIDAY NIGHT. THREAT FOR MORE ORGANIZED CONVECTION/PRECIP AS
DYMAMICS COME MORE IN PLACE.
&&

EXTENDED PERIOD DISCUSSION...
HIGH PRESSURE IN CONTROL SATURDAY NIGHT
AND REMAINDER OF WEEKEND AND THEN SERIES OF FRONTAL BOUNDARIES
AFFECTING AREA EARLY NEXT WITH WITH CHANCE OF PRECIP.
&&

.PRELIMINARY POINT TEMPS/POPS...
PITTSBURGH, PA        82  63  82  65 /  30  30  30  30
WHEELING,   WV        83  63  82  64 /  30  30  30  30
MORGANTOWN, WV        81  64  83  65 /  30  30  30  30
ZANESVILLE, OH        84  63  81  65 /  30  30  30  40
NEW PHILADELPHIA, OH  83  63  82  64 /  30  30  30  40
FRANKLIN, PA          81  60  81  59 /  40  40  30  30
DUBOIS, PA            81  60  80  60 /  40  40  30  30
LATROBE, PA           80  61  81  61 /  30  30  30  30
BUTLER, PA            82  63  81  61 /  40  30  30  30
INDIANA, PA           79  60  82  60 /  30  30  30  30
OAKLAND, MD           79  57  79  61 /  30  30  30  30
&&

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

99/99

Hazardous weather outlook, May 12, 4:40 AM EDT, 13 hours 21 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE PITTSBURGH PA
440 AM EDT WED MAY 12 2004

MDZ001-OHZ039>041-048>050-057>059-068-069-PAZ007>009-013>016-020>023-
029>032-WVZ001>004-012-021>023-041-120839-
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-
440 AM EDT WED MAY 12 2004

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

.DAY ONE...TODAY

SHOWERS AND THUNDERSTORMS WILL DEVELOP AGAIN TODAY. THIS ACTIVITY...
FOR THE MOST PART...WILL BE ISOLATED AND IS NOT EXPECTED TO REACH
SEVERE LEVELS. HOWEVER...STORMS THAT DO DEVELOP WILL BE SLOW
MOVING AND COULD PRODUCE VERY HEAVY RAIN.

.DAYS TWO THROUGH SEVEN...

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.SPOTTER CALL TO ACTION STATEMENT...

SPOTTER ACTIVATION IS NOT ANTICIPATED.

In the hours before

Special weather statement, May 12, 2:08 PM EDT, 3 hours 53 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE PITTSBURGH PA
208 PM EDT WED MAY 12 2004

OHZ041-050-WVZ001-002-121858-
BROOKE WV-COLUMBIANA OH-HANCOCK WV-JEFFERSON OH-
208 PM EDT WED MAY 12 2004

...THUNDERSTORMS WITH TORRENTIAL DOWNPOURS...

AT 200 PM THUNDERSTORMS WITH TORRENTIAL DOWNPOURS WERE MOVING THROUGH
COLUMBIANA... JEFFERSON... HANCOCK AND BROOKE COUNTIES.  THESE STORMS
ARE MOVING VERY SLOW TO THE NORTHEAST AND WILL PRODUCE HEAVY RAINS
AND HAIL.  THE MOST POTENT STORMS WERE OVER WEIRTON AND NEAR EAST
LIVERPOOL.

Special weather statement, May 12, 2:59 PM EDT, 3 hours 2 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE PITTSBURGH PA
259 PM EDT WED MAY 12 2004

OHZ041-121936-
COLUMBIANA OH-
259 PM EDT WED MAY 12 2004

...THUNDERSTORM WITH TORRENTIAL DOWNPOURS AND HAIL...

AT 257 PM THUNDERSTORMS WITH TORRENTIAL DOWNPOURS AND HAIL WERE OVER
COLUMBIANA COUNTY. THESE STORMS ARE VERY SLOW MOVING AND WILL
PRODUCE HEAVY RAINS AND HAIL AS THEY MOVE SLOWLY NORTHEAST.  THE MOST
POTENT STORM WAS OVER THE WEST POINT AREA.

Local storm report, May 12, 3:04 PM EDT, 2 hours 57 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE PITTSBURGH PA
304 PM EDT WED MAY 12 2004

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

0300 PM     HAIL             2 W TORONTO             40.46N 80.64W
05/12/2004  1.00 INCH        JEFFERSON          OH   PUBLIC

&&

Local storm report, May 12, 3:38 PM EDT, 2 hours 23 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE PITTSBURGH PA
338 PM EDT WED MAY 12 2004

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

0305 PM     HAIL             NEW CUMBERLAND          40.50N 80.61W
05/12/2004  0.75 INCH        HANCOCK            WV   PUBLIC

&&

Special weather statement, May 12, 5:13 PM EDT, 48 minutes before

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Special weather statement, May 12, 5:14 PM EDT, 47 minutes before

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The office that day

Everything else NWS Pittsburgh, PA issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 12, 4:38 PM EDT	Severe Thunderstorm Warning	PBZ	Armstrong	67 min
May 12, 2:39 PM EDT	Severe Thunderstorm Warning	PBZ	Jefferson	66 min

Nearby

Severe Thunderstorm Warnings in Pennsylvania, 2004 Every severe thunderstorm warning in 2004

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.