Alert archive / West Virginia / Severe Thunderstorm Warnings in 2007

Severe Thunderstorm Warning 218, NWS Pittsburgh, PA

August 9, 2007Marshall County, West Virginia

NWS Pittsburgh, PA issued this severe thunderstorm warning at Aug 9, 2007, 4:46 PM EDT for Marshall County, West Virginia. It was in force for 41 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: Aug 9, 2007, 4:46 PM EDT (20:46 UTC)
Expired: Aug 9, 2007, 5:27 PM EDT
In force: 41 min
Issued by: NWS Pittsburgh, PA
Area: Counties, with a storm outline in the text

County Marshall County, WV

The radar

The Pittsburgh radar (KPBZ), 84 km from the middle of the area, began a volume at 20:48 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Aug 9, 1:22 PM EDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Pittsburgh, PA (KPIT), launched 12:00Z, 8.8 hours before the alert went out and 78 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: 685 J/kg
Mixed-layer CIN: -50 J/kg
Mixed-layer LCL: 717 m above ground
0-6 km bulk shear: 33 kt
0-1 km storm-relative helicity: 124 m²/s²
0-3 km storm-relative helicity: 218 m²/s²
Significant tornado parameter: 0.5
Supercell composite: 3.6

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 Aug 9, 3:12 PM EDT, 1 hour 34 minutes earlier.

Area forecast discussion, Aug 9, 3:12 PM EDT, 1 hour 34 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PITTSBURGH PA
312 PM EDT THU AUG 9 2007

.SYNOPSIS...
A LOW PRESSURE CENTER MOVING THROUGH THE HUMID UPPER OHIO VALLEY
THIS AFTERNOON AND TONIGHT WILL BE ACCOMPANIED BY A COUPLE ROUNDS
OF THUNDERSTORMS. SOME STORMS CAN BE SEVERE WITH DAMAGING WIND AND
HAIL, FREQUENT LIGHTNING, PLUS HAVE RAIN HEAVY ENOUGH TO CAUSE FLASH
FLOODING. ON FRIDAY, MIDWEST HIGH PRESSURE WILL START BRINGING DRIER
AIR INTO THE REGION.

&&

.NEAR TERM /UNTIL 6 AM FRIDAY MORNING/...
RECENT SREF MODEL RUNS SUPPORTED BY RECENT RADAR DATA SHOW AT
LEAST ANOTHER BAND OF THUNDERSTORMS MOVING THROUGH THE UPPER OHIO
VALLEY TONIGHT. THE NEXT BAND HAS SEVERE CHARACTERISTICS OVER
NORTHWESTERN OHIO AND SPC HAS A SEVERE THUNDERSTORM WATCH UNTIL 8
PM.

THUS AM ALSO MAINTAINING A FLASH FLOOD WATCH FOR ENTIRE FORECAST
AREA THROUGH 6 AM FRIDAY. REGARDING FLASH FLOODING, FLASH FLOOD
INDICES SUGGEST 2 INCHES IN 3 HOURS CAN CAUSE ONSET OF FLASH
FLOODING.

WITH RAINS EXPECTED, CAN BE PATCHY LATE NIGHT FOG DEVELOPMENT.

LOW TEMPERATURES CLOSE TO GFS MOS GUIDANCE AND CURRENT DEW POINTS.

&&

.SHORT TERM /6 AM FRIDAY MORNING THROUGH FRIDAY NIGHT/...
SREF MODEL RUNS SHOW LOW PRESSURE CENTER EAST OF THE APPALACHIAN
MOUNTAINS BY MIDMORNING, WITH DRIER AIR ENSUING. WITH INSTABILITY
AND LIFT DECREASING, NO THUNDERSTORMS FORECASTED AFTER MIDDAY.

&&

.LONG TERM /SATURDAY THROUGH THURSDAY/...
BOTH RECENT GFS AND ECMWF MODEL RUNS SHOW AN UPPER LEVEL RIDGE
REMAINING ACROSS THE PLAINS STATES INTO EARLY NEXT WEEK. THIS
SCENARIO WILL MAINTAIN SEASONABLE VALUES OF TEMPERATURE AND
HUMIDITY ACROSS THE UPPER OHIO VALLEY THESE DAYS IN CONCERT WITH
HPC GUIDANCE AND GFS OPERATIONAL MOS VALUES. NEXT BEST CHANCE OF
THUNDERSTORMS APPEARS TO BE MONDAY WHEN MODELS SHOWS A FRONTAL
PASSAGE THROUGH THE UPPER OHIO VALLEY.

&&

.AVIATION /19Z THURSDAY THROUGH TUESDAY/...
EXPECT VFR FLIGHT CONDITIONS TO BE INTERRUPTED BY PERIODS OF IFR
FLIGHT CONDITIONS DURING THUNDERSTORM PASSAGES UNTIL AROUND
MIDNIGHT. WINDS WILL BE GENERALLY SOUTH TO SOUTHWEST 7-12KTS, BUT
CAN GUST TO SEVERE LIMITS.

LATE TONIGHT, IFR FLIGHT CONDITIONS CAN BE MORE PERSISTENT WITH
POST-RAIN FOG DEVELOPMENT.

DURING FRIDAY, EXPECT MAINLY VFR FLIGHT CONDITIONS AS POST-SYSTEM DRYOUT
BEGINS. THE NEXT CHANCE FOR THUNDERSTORMS AND IFR FLIGHT
CONDITIONS WILL BE MONDAY WITH NEXT FRONTAL PASSAGE.

&&

.PBZ WATCHES/WARNINGS/ADVISORIES...
MD...FLASH FLOOD WATCH THROUGH LATE TONIGHT FOR MDZ001.
OH...FLASH FLOOD WATCH THROUGH LATE TONIGHT FOR OHZ039>041-048>050-
     057>059-068-069.
PA...FLASH FLOOD WATCH THROUGH LATE TONIGHT FOR PAZ007>009-013>016-
     020>023-029>032.
WV...FLASH FLOOD WATCH THROUGH LATE TONIGHT FOR WVZ001>004-012-
     021>023-041.

&&

Hazardous weather outlook, Aug 9, 1:27 PM EDT, 3 hours 19 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE PITTSBURGH PA
127 PM EDT THU AUG 9 2007

MDZ001-OHZ039>041-048>050-057>059-068-069-PAZ007>009-013>016-020>023-
029>032-WVZ001>004-012-021>023-101730-
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-WESTMORELAND-GREENE-FAYETTE-HANCOCK-
BROOKE-OHIO-MARSHALL-WETZEL-MARION-MONONGALIA-PRESTON-
127 PM EDT THU AUG 9 2007

...FLASH FLOOD WATCH IN EFFECT THROUGH LATE TONIGHT...
...SEVERE THUNDERSTORM WATCH 575 IN EFFECT UNTIL 8 PM EDT THIS
EVENING...

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

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

   FLASH FLOOD WATCH.
   SEVERE THUNDERSTORM WATCH.

NATIONAL WEATHER SERVICE PITTSBURGH SAYS FLASH FLOODING IS
POSSIBLE FROM TORRENTIAL THUNDERSTORM RAINS THIS AFTERNOON INTO
TONIGHT, WHERE RAIN AMOUNTS GO OVER 2 INCHES IN A COUPLE HOURS.

NATIONAL WEATHER SERVICE PITTSBURGH ALSO SAYS SEVERE THUNDERSTORMS
ARE POSSIBLE THIS AFTERNOON INTO TONIGHT. THE PRIMARY SEVERE
WEATHER THREAT WILL BE DAMAGING THUNDERSTORM WINDS, HOWEVER THERE
CAN BE LARGE HAIL ALSO. ISOLATED TORNADOES ARE POSSIBLE.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION WILL LIKELY BE NEEDED.

WVZ041-101730-
TUCKER-
127 PM EDT THU AUG 9 2007

...FLASH FLOOD WATCH IN EFFECT THROUGH LATE TONIGHT...

THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTHERN 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.

   FLASH FLOOD WATCH.

NATIONAL WEATHER SERVICE PITTSBURGH SAYS FLASH FLOODING IS
POSSIBLE FROM TORRENTIAL THUNDERSTORM RAINS THIS AFTERNOON INTO
TONIGHT, WHERE RAIN AMOUNTS GO OVER 2 INCHES IN A COUPLE HOURS.

THERE IS ALSO A SLIGHT RISK OF SEVERE THUNDERSTORMS THIS
AFTERNOON INTO TONIGHT. THE PRIMARY SEVERE WEATHER THREAT WILL BE
DAMAGING THUNDERSTORM WINDS, HOWEVER THERE CAN BE LARGE HAIL ALSO.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION WILL LIKELY BE NEEDED.

In the hours before

Local storm report, Aug 9, 3:30 PM EDT, 1 hour 16 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE PITTSBURGH PA
330 PM EDT THU AUG 09 2007

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

0305 PM     HAIL             PITTSBURGH              40.44N 79.98W
08/09/2007  E1.00 INCH       ALLEGHENY          PA   PUBLIC

            PUBLIC REPORTED HAIL APPROXIMATELY 1.00 INCHES IN
            DIAMETER.

&&

Local storm report, Aug 9, 3:40 PM EDT, 1 hour 6 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE PITTSBURGH PA
340 PM EDT THU AUG 09 2007

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

0340 PM     HEAVY RAIN       MONESSEN                40.15N 79.88W
08/09/2007  M3.03 INCH       WESTMORELAND       PA   TRAINED SPOTTER

            3.03 INCHES OF RAINFALL IN ONE HOUR AND 35 MINUTES.

&&

Local storm report, Aug 9, 3:47 PM EDT, 59 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE PITTSBURGH PA
347 PM EDT THU AUG 09 2007

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

0335 PM     TSTM WND DMG     MOUNT PLEASANT          40.15N 79.54W
08/09/2007                   WESTMORELAND       PA   PUBLIC

            LARGE BRANCHES DOWN.

&&

Local storm report, Aug 9, 4:05 PM EDT, 41 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE PITTSBURGH PA
405 PM EDT THU AUG 09 2007

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

0403 PM     FLASH FLOOD      5 WNW PITTSBURGH        40.47N 80.06W
08/09/2007                   ALLEGHENY          PA   AMATEUR RADIO

            MCNIGHT ROAD CLOSED DUE TO FLOODING.

&&

Local storm report, Aug 9, 4:08 PM EDT, 38 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE PITTSBURGH PA
408 PM EDT THU AUG 09 2007

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

0403 PM     DOWNBURST        GREENSBURG              40.31N 79.54W
08/09/2007                   WESTMORELAND       PA   AMATEUR RADIO

            TREES DOWN IN THE CITY OF GREENSBURG.

&&

Special weather statement, Aug 9, 4:27 PM EDT, 19 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE PITTSBURGH PA
427 PM EDT THU AUG 9 2007

MDZ001-WVZ021>023-092130-
GARRETT MD-MARION WV-MONONGALIA WV-PRESTON WV-
427 PM EDT THU AUG 9 2007

...THUNDERSTORMS...

THUNDERSTORMS TO MOVE THROUGH THE FOLLOWING COUNTIES...
GARRETT...MARION...PRESTON AND MONONGALIA...

AT 422 PM EDT NATIONAL WEATHER SERVICE DOPPLER RADAR IN PITTSBURGH
INDICATED SOME STRONG THUNDERSTORMS ACROSS THE SOUTHERN TIER OF
SOUTHWEST PENNSYLVANIA. SEVERAL OF THESE STORMS WILL BE DRIFTING
ACROSS THE WEST VIRGINIA BORDER AND AFFECT NORTHERN PORTIONS OF
MONONGALIA...PRESTON...AND GARRETT COUNTIES.

BE ALERT FOR VERY HEAVY RAIN...DANGEROUS LIGHTNING...SMALL
HAIL...AND STRONG WIND GUSTS. THESE STORMS COULD BECOME SEVERE AND
WARNINGS COULD BE ISSUED.

KEEP AN EYE TO THE SKY AND MOVE TO A SAFE PLACE IF THUNDERSTORMS
APPROACH.

PLEASE REPORT HAIL...STRONG WINDS OR WIND DAMAGE TO THE NATIONAL
WEATHER SERVICE BY CALLING TOLL FREE...1-877-633-6772.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 800 PM EDT
THURSDAY EVENING FOR WESTERN MARYLAND AND EAST CENTRAL OHIO AND
WESTERN PENNSYLVANIA AND NORTHERN WEST VIRGINIA.

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 9, 8:16 AM EDT	Areal Flood Advisory	PBZ	Allegheny	3 hr
Aug 9, 8:26 AM EDT	Severe Thunderstorm Warning	PBZ	Armstrong, Westmoreland	34 min
Aug 9, 8:39 AM EDT	Severe Thunderstorm Warning	PBZ	Indiana	51 min
Aug 9, 8:45 AM EDT	Flash Flood Warning	PBZ	Allegheny	2 hr
Aug 9, 8:59 AM EDT	Severe Thunderstorm Warning	PBZ	Westmoreland	46 min
Aug 9, 9:04 AM EDT	Flash Flood Warning	PBZ	Westmoreland	3 hr
Aug 9, 9:23 AM EDT	Flash Flood Warning	PBZ	Indiana	2 hr
Aug 9, 11:47 AM EDT	Flash Flood Watch	PBZ	Allegheny, Armstrong, Beaver, Butler, Clarion, Forest and 6 more	15 hr
Aug 9, 1:42 PM EDT	Severe Thunderstorm Warning	PBZ	Greene	63 min
Aug 9, 1:50 PM EDT	Severe Thunderstorm Warning	PBZ	Beaver, Lawrence	55 min
Aug 9, 2:09 PM EDT	Flash Flood Warning	PBZ	Beaver	3 hr
Aug 9, 2:19 PM EDT	Severe Thunderstorm Warning	PBZ	Fayette, Washington	71 min
Aug 9, 2:28 PM EDT	Severe Thunderstorm Warning	PBZ	Allegheny	62 min
Aug 9, 2:32 PM EDT	Flash Flood Warning	PBZ	Allegheny	3 hr
Aug 9, 2:35 PM EDT	Tornado Warning	PBZ	Allegheny	37 min
Aug 9, 2:45 PM EDT	Flash Flood Warning	PBZ	Washington	3 hr
Aug 9, 2:56 PM EDT	Severe Thunderstorm Warning	PBZ	Westmoreland	94 min
Aug 9, 3:15 PM EDT	Flash Flood Warning	PBZ	Westmoreland	9 hr
Aug 9, 3:26 PM EDT	Severe Thunderstorm Warning	PBZ	Washington	64 min
Aug 9, 3:26 PM EDT	Severe Thunderstorm Warning	PBZ	Fayette	64 min
Aug 9, 3:47 PM EDT	Severe Thunderstorm Warning	PBZ	Greene	58 min
Aug 9, 3:49 PM EDT	Flash Flood Warning	PBZ	Fayette	8 hr
Aug 9, 5:24 PM EDT	Flash Flood Warning	PBZ	Allegheny	7 hr
Aug 9, 5:42 PM EDT	Flash Flood Warning	PBZ	Washington	4 hr
Aug 9, 6:03 PM EDT	Severe Thunderstorm Warning	PBZ	Beaver	46 min
Aug 9, 6:08 PM EDT	Flash Flood Warning	PBZ	Beaver, Lawrence, Mercer	4 hr
Aug 9, 6:25 PM EDT	Severe Thunderstorm Warning	PBZ	Lawrence	35 min
Aug 9, 6:29 PM EDT	Severe Thunderstorm Warning	PBZ	Allegheny, Butler	61 min
Aug 9, 7:24 PM EDT	Severe Thunderstorm Warning	PBZ	Washington	66 min
Aug 9, 7:34 PM EDT	Severe Thunderstorm Warning	PBZ	Greene	56 min
Aug 9, 7:56 PM EDT	Severe Thunderstorm Warning	PBZ	Fayette	64 min
Aug 9, 1:05 PM EDT	Severe Thunderstorm Warning	PBZ	Carroll, Columbiana	55 min
Aug 9, 2:01 PM EDT	Severe Thunderstorm Warning	PBZ	Columbiana	59 min
Aug 9, 2:15 PM EDT	Severe Thunderstorm Warning	PBZ	Jefferson	60 min
Aug 9, 2:39 PM EDT	Severe Thunderstorm Warning	PBZ	Tuscarawas	66 min
Aug 9, 2:53 PM EDT	Flash Flood Warning	PBZ	Carroll, Columbiana	2 hr
Aug 9, 2:57 PM EDT	Severe Thunderstorm Warning	PBZ	Carroll	44 min
Aug 9, 5:22 PM EDT	Severe Thunderstorm Warning	PBZ	Coshocton	53 min
Aug 9, 5:28 PM EDT	Severe Thunderstorm Warning	PBZ	Carroll, Columbiana	62 min
Aug 9, 5:49 PM EDT	Severe Thunderstorm Warning	PBZ	Tuscarawas	56 min
Aug 9, 5:54 PM EDT	Tornado Warning	PBZ	Columbiana	53 min
Aug 9, 5:57 PM EDT	Flash Flood Warning	PBZ	Carroll, Columbiana, Coshocton, Tuscarawas	4 hr
Aug 9, 6:21 PM EDT	Severe Thunderstorm Warning	PBZ	Harrison	48 min
Aug 9, 6:29 PM EDT	Severe Thunderstorm Warning	PBZ	Guernsey	61 min
Aug 9, 2:15 PM EDT	Severe Thunderstorm Warning	PBZ	Hancock	60 min
Aug 9, 3:43 PM EDT	Flash Flood Warning	PBZ	Brooke	2 hr
Aug 9, 3:55 PM EDT	Severe Thunderstorm Warning	PBZ	Marshall	27 min
Aug 9, 4:39 PM EDT	Severe Thunderstorm Warning	PBZ	Monongalia	66 min
Aug 9, 5:10 PM EDT	Severe Thunderstorm Warning	PBZ	Preston	65 min
Aug 9, 5:12 PM EDT	Tornado Warning	PBZ	Monongalia	21 min
Aug 9, 6:16 PM EDT	Severe Thunderstorm Warning	PBZ	Tucker	74 min
Aug 9, 6:19 PM EDT	Severe Thunderstorm Warning	PBZ	Hancock	26 min
Aug 9, 6:44 PM EDT	Flash Flood Warning	PBZ	Tucker	4 hr
Aug 9, 7:13 PM EDT	Severe Thunderstorm Warning	PBZ	Monongalia	62 min

Nearby

Severe Thunderstorm Warnings in West Virginia, 2007 Every severe thunderstorm warning in 2007

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.