Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 126, NWS Pittsburgh, PA

July 3, 2011Fayette County, Greene County, Pennsylvania

NWS Pittsburgh, PA issued this severe thunderstorm warning at Jul 3, 2011, 3:20 PM EDT for Fayette County, Greene County, Pennsylvania. It was in force for 55 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: Jul 3, 2011, 3:20 PM EDT (19:20 UTC)
Expired: Jul 3, 2011, 4:15 PM EDT
In force: 55 min
Issued by: NWS Pittsburgh, PA
Area: Storm-based polygon

Counties Fayette County, PA, Greene County, PA

The radar

The Pittsburgh radar (KPBZ), 76 km from the middle of the area, began a volume at 19:20 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, 7.3 hours before the alert went out and 60 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: 568 J/kg
Mixed-layer CIN: -164 J/kg
Mixed-layer LCL: 1090 m above ground
0-6 km bulk shear: 25 kt
0-1 km storm-relative helicity: 159 m²/s²
0-3 km storm-relative helicity: 150 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 Jul 3, 1:47 PM EDT, 1 hour 33 minutes earlier.

Area forecast discussion, Jul 3, 1:47 PM EDT, 1 hour 33 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PITTSBURGH PA
147 PM EDT SUN JUL 3 2011

.SYNOPSIS...
A WEAK COLD FRONT WILL DROP SOUTHEASTWARD ACROSS THE REGION TODAY,
BRINGING A FEW SHOWERS AND THUNDERSTORMS. HIGH PRESSURE WILL THEN
BUILD IN FROM THE NORTHWEST WITH PREDOMINATELY DRY WEATHER
EXPECTED MONDAY INTO WEDNESDAY.

&&

.NEAR TERM /THROUGH TONIGHT/...
18Z ENHANCED SHORT TERM FORECAST UPDATE HAS BEEN ISSUED WITH MINOR
CHANGES FOR RECENT TRENDS IN OBS. A WEAK FRONT IS DEFINED BY A
WIND SHIFT EXTENDING FROM DUBOIS SOUTHWESTWARD TO PITTSBURGH TO
ZANESVILLE. INCREASING INSTABILITY WITH THE FRONT DROPPING
SOUTHEASTWARD WILL PROVIDE A BETTER CHANCE OF CONVECTION
DEVELOPING SOUTH OF THIS WIND SHIFT INTO THIS EVENING. FORECAST
HIGHS TODAY HAVE BEEN BUMPED UP A FEW DEGREES CLOSER TO MET
GUIDANCE SOUTH OF PITTSBURGH.

TONIGHT...REMNANT CONVECTION FOCUSED ALONG A MOSTLY WASHED OUT FRONT
WILL DIMINISH AND PUSH SOUTH OF THE AREA. CIRRUS SPILLING INTO
THE AREA FROM THE WEST AND DEW POINTS NEAR 60 WILL LIMIT OVERNIGHT
LOWS. LOW TEMPS AGAIN ARE CLOSER TO THE WARMER MET GUIDANCE.

&&

.SHORT TERM /MONDAY THROUGH MONDAY NIGHT/...
12Z RUNS OF THE NAM/GFS ARE INDICATING THAT A WEAK SHORT WAVE
WILL PUSH ACROSS EASTERN OHIO AND WEST VIRGINIA ON THE FOURTH OF
JULY. THE SLIGHT CHANCE OF LATE AFTERNOON AND EARLY EVENING
THUNDERSTORMS HAS BEEN ADDED SOUTHWEST OF PITTSBURGH WITH THE
SUPPORT OF THE 12Z 4KM WRF-NMM. IF ANY CONVECTION DEVELOPS, IT
WILL DIMINISH FOR THE OVERNIGHT WITH THE LOSS OF HEATING.
TEMPERATURES WILL BE A FEW DEGREES ABOVE NORMAL THROUGH THIS
PERIOD.

&&

.LONG TERM /TUESDAY THROUGH SUNDAY/...
HIGH PRESSURE WILL BRING CONTINUED DRY WEATHER FOR TUESDAY INTO
TUESDAY NIGHT. A COLD FRONT WILL PUSH THROUGH THE FORECAST AREA
WEDNESDAY NIGHT INTO THURSDAY WITH A CHANCE OF SHOWERS AND
THUNDERSTORMS. HIGH PRESSURE MOVING IN BEHIND THE FRONT WILL
BRING DRY WEATHER FOR FRIDAY INTO SATURDAY.

&&

.AVIATION /18Z SUNDAY THROUGH FRIDAY/...
WIND SHIFT LINE IS THROUGH KPIT AND SHOULD PROGRESS ACROSS REMAINING
TERMINALS  BY EVENING. SOME MVFR CIGS ALONG AND JUST BEHIND WIND
SHIFT THEN CLEARING ACROSS THE FAR NORTH AS DEW POINTS DROP SOMEWHAT
ALONG WITH DEEPER DRYING IN THE MID LEVELS. ONLY REMAINING CHANCE
FOR AFTERNOON THUNDERSTORM LOOKS TO BE KMGW AS LOW LEVEL
CONVERGENCE AHEAD OF WIND SHIFT MAY BE ABLE TO INITIATE SCATTERED
CONVECTION. OTHERWISE WINDS WILL BECOME LIGHT NORTHWEST TO NORTH
OVERNIGHT WITH SKIES CLEARING. ADDED MVFR FOG TOWARD DAYBREAK MOST
AREAS BUT THIS SHOULD BE SHORT LIVED.

ON MONDAY MODELS ATTEMPT TO BRING SHORTWAVE ACROSS LOWER OHIO
VALLEY AND THIS COULD MAY BRING SCATTERED CONVECTION TO KZZV OR KMGW
DURING THE DAY BUT CHANCES TOO SLIM TO MENTION AT THIS TIME.

HIGH PRESSURE WILL KEEP GENERAL VFR INTO LATE WEDNESDAY WHEN FRONT
WILL WORK ACROSS REGION WITH POSSIBLE RESTRICTIONS INTO THURSDAY.
GENERAL VFR BEHIND FRONT FOR FRIDAY.

&&

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

&&

Hazardous weather outlook, Jul 3, 5:05 AM EDT, 10 hours 15 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE PITTSBURGH PA
505 AM EDT SUN JUL 3 2011

MDZ001-OHZ039>041-048>050-057>059-068-069-PAZ007>009-013>016-020>023-
029-031-073>076-WVZ001>004-012-021>023-041-040915-
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-
505 AM EDT SUN JUL 3 2011

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...TODAY AND TONIGHT.

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY.

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME.

In the hours before

Special weather statement, Jul 3, 2:46 PM EDT, 34 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE PITTSBURGH PA
246 PM EDT SUN JUL 3 2011

OHZ069-WVZ004-012-031930-
MARSHALL WV-MONROE OH-WETZEL WV-
246 PM EDT SUN JUL 3 2011

...STRONG THUNDERSTORMS WILL AFFECT MONROE...NORTHWESTERN WETZEL AND
SOUTHERN MARSHALL COUNTIES...

AT 241 PM EDT...A CLUSTER OF STRONG THUNDERSTORMS WAS LOCATED ACROSS
NORTHERN MONROE COUNTY...MOVING EAST AT 10 MPH.

WIND GUSTS TO 40 MPH AND HAIL UP TO DIME SIZE ARE POSSIBLE WITH THESE
STORMS.

SOME LOCATIONS THAT WILL BE IMPACTED INCLUDE...
  WOODSFIELD...         LEWISVILLE...         GRAYSVILLE...
  ANTIOCH...            BENWOOD...            ROUND BOTTOM...
  WOODLANDS...          WILEYVILLE...         PROCTOR...
  PORTERS FALLS...      PINE GROVE...         NEW MARTINSVILLE...

PLEASE REPORT SIGNIFICANT WEATHER TO THE NATIONAL WEATHER SERVICE BY
CALLING TOLL FREE...877-633-6772...WHEN YOU CAN DO SO SAFELY.

LAT...LON 3958 8085 3959 8085 3959 8087 3968 8125
      3981 8128 3986 8114 3979 8054 3954 8067

WOODRUM

Special weather statement, Jul 3, 3:05 PM EDT, 15 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE PITTSBURGH PA
305 PM EDT SUN JUL 3 2011

PAZ029-031-075-076-032000-
FAYETTE PA-FAYETTE RIDGES PA-GREENE PA-WASHINGTON PA-
305 PM EDT SUN JUL 3 2011

...STRONG THUNDERSTORMS WILL AFFECT GREENE...SOUTHERN WASHINGTON
AND FAYETTE COUNTIES...

AT 300 PM EDT NATIONAL WEATHER SERVICE DOPPLER RADAR IN PITTSBURGH
INDICATED A CLUSTER OF STRONG THUNDERSTORMS EXTENDING FROM 3 MILES
NORTHWEST OF FAIRCHANCE TO 3 MILES WEST OF ROGERSVILLE...MOVING
SOUTHEAST AT 15 MPH.

WIND GUSTS TO 40 MPH AND HAIL UP TO DIME SIZE ARE POSSIBLE WITH THESE
STORMS.

SOME LOCATIONS THAT WILL BE IMPACTED BY THESE STORMS INCLUDE...
WAYNESBURG...    NEMACOLIN...    MARIANNA...  JEFFERSON BORO...
CARMICHAELS...   BROWNSVILLE...  ROGERSVILLE...
UNIONTOWN...     MASONTOWN...

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.

&&

LAT...LON 3992 7938 3985 7941 3984 7938 3981 7935
      3978 7939 3972 7940 3972 7988 3974 8048
      4009 8050 4000 7933 3999 7932

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 3, 1:04 AM EDT	Special Weather Statement	PBZ	Fayette	56 min
Jul 3, 1:49 AM EDT	Special Weather Statement	PBZ	Greene	56 min
Jul 3, 3:05 PM EDT	Special Weather Statement	PBZ	Fayette, Greene	55 min
Jul 3, 4:01 PM EDT	Special Weather Statement	PBZ	Fayette, Greene	59 min
Jul 3, 4:03 PM EDT	Severe Thunderstorm Warning	PBZ	Fayette	27 min
Jul 3, 4:14 PM EDT	Areal Flood Advisory	PBZ	Fayette, Greene	2 hr
Jul 3, 2:46 PM EDT	Special Weather Statement	PBZ	Monroe	44 min
Jul 3, 3:26 PM EDT	Severe Thunderstorm Warning	PBZ	Monroe	34 min
Jul 3, 4:45 PM EDT	Areal Flood Advisory	PBZ	Monroe	3 hr
Jul 3, 2:42 AM EDT	Special Weather Statement	PBZ	Preston	63 min
Jul 3, 4:04 PM EDT	Special Weather Statement	PBZ	Wetzel	56 min
Jul 3, 5:00 PM EDT	Special Weather Statement	PBZ	Marion, Wetzel	45 min
Jul 3, 5:40 PM EDT	Special Weather Statement	PBZ	Tucker	50 min

Nearby

Severe Thunderstorm Warnings in Pennsylvania, 2011 Every severe thunderstorm warning in 2011

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.