Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 144, NWS Pittsburgh, PA

July 18, 2011Butler County, Pennsylvania

NWS Pittsburgh, PA issued this severe thunderstorm warning at Jul 18, 2011, 3:02 PM EDT for Butler County, Pennsylvania. It was in force for 28 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 18, 2011, 3:02 PM EDT (19:02 UTC)
Expired: Jul 18, 2011, 3:30 PM EDT
In force: 28 min
Issued by: NWS Pittsburgh, PA
Area: Storm-based polygon

County Butler County, PA

The radar

The Pittsburgh radar (KPBZ), 49 km from the middle of the area, began a volume at 19:02 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, 7.0 hours before the alert went out and 58 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: 243 J/kg
Mixed-layer CIN: -76 J/kg
Mixed-layer LCL: 725 m above ground
0-6 km bulk shear: 22 kt
0-1 km storm-relative helicity: 83 m²/s²
0-3 km storm-relative helicity: 91 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.7

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 18, 1:49 PM EDT, 1 hour 13 minutes earlier.

Area forecast discussion, Jul 18, 1:49 PM EDT, 1 hour 13 minutes before

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Hazardous weather outlook, Jul 18, 4:14 AM EDT, 10 hours 48 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE PITTSBURGH PA
414 AM EDT MON JUL 18 2011

MDZ001-OHZ039>041-048>050-057>059-068-069-PAZ007>009-013>016-020>023-
029-031-073>076-WVZ001>004-012-021>023-041-190815-
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-
414 AM EDT MON JUL 18 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.

THERE IS A CHANCE FOR SEVERE THUNDERSTORMS TODAY WITH THE PRIMARY
THREATS COMING FROM DAMAGING WIND AND LARGE HAIL.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY.

STRONG HIGH PRESSURE IS PROJECTED TO BUILD ACROSS THE REGION
DURING THE LATTER HALF OF THE WEEK. IF THIS OCCURS...THE HOTTEST
TEMPERATURES THUS FAR THIS SUMMER WILL BE LIKELY WITH HEAT INDEX
VALUES WELL INTO THE 90S TO NEAR 100 IN SOME AREAS.

.SPOTTER INFORMATION STATEMENT...

WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER
CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES.

15

In the hours before

Special weather statement, Jul 18, 12:15 PM EDT, 2 hours 47 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE PITTSBURGH PA
1215 PM EDT MON JUL 18 2011

PAZ007>009-181715-
FOREST PA-MERCER PA-VENANGO PA-
1215 PM EDT MON JUL 18 2011

...STRONG THUNDERSTORMS WILL AFFECT NORTHERN FOREST...NORTHERN MERCER
AND NORTHERN VENANGO COUNTIES...

AT 1208 PM EDT...STRONG THUNDERSTORMS WERE ALONG A LINE FROM 18 MILES
NORTH OF PLEASANTVILLE TO 7 MILES WEST OF CONNEAUT LAKE...MOVING
SOUTHEAST AT 25 MPH.

WIND GUSTS TO 50 MPH AND HAIL UP TO DIME SIZE ARE POSSIBLE WITH THESE
STORMS. THERE CAN ALSO BE LOCALLY HEAVY RAIN AND A SHORT INTERVAL OF
FREQUENT LIGHTNING.

SOME LOCATIONS THAT WILL BE IMPACTED INCLUDE...
  GREENVILLE...         MAURICE K GODDARD STATE PARK...
  PLEASANTVILLE...      WEST HICKORY...
  OIL CREEK STATE PARK...                     LYNCH...
  COOPERSTOWN...        BALLTOWN...

WHEN THUNDERSTORMS THREATEN...GO INDOORS IF YOU CAN.

DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE
ROADWAY. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS
SAFELY. MOVE TO HIGHER GROUND. CAMPERS...WATCH STREAM LEVELS AND BE
READY TO MOVE TO HIGHER GROUND.

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

LAT...LON 4162 7895 4159 7897 4140 8000 4139 8051
      4142 8053 4149 8052 4149 8001 4163 7983

Special weather statement, Jul 18, 1:15 PM EDT, 1 hour 47 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE PITTSBURGH PA
115 PM EDT MON JUL 18 2011

PAZ007>009-013>015-022-181800-
ARMSTRONG PA-BUTLER PA-CLARION PA-FOREST PA-LAWRENCE PA-MERCER PA-
VENANGO PA-
115 PM EDT MON JUL 18 2011

...STRONG THUNDERSTORMS WILL AFFECT EXTREME NORTHWESTERN ARMSTRONG...
NORTHEASTERN LAWRENCE...NORTHERN BUTLER...NORTHERN CLARION...SOUTHERN
FOREST...SOUTHERN MERCER AND VENANGO COUNTIES...

AT 109 PM EDT...STRONG THUNDERSTORMS WERE ALONG A LINE FROM OIL CITY
TO 5 MILES EAST OF MERCER...MOVING SOUTHEAST AT 30 MPH.

WIND GUSTS TO 40 MPH AND HAIL UP TO DIME SIZE ARE POSSIBLE WITH THESE
STORMS. IN ADDITION...HEAVY RAIN MAY CAUSE PONDING ON ROADWAYS AND
REDUCED VISIBILITIES.

SOME LOCATIONS THAT WILL BE IMPACTED INCLUDE...
  SUGARCREEK...         STONEBORO...          POLK...
  OIL CREEK STATE PARK...                     OIL CITY...
  MERCER...             FRANKLIN...           COOPERSTOWN...
  SENECA...             HARLANSBURG...        GROVE CITY...
  KENNERDELL...

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

LAT...LON 4139 7915 4081 8007 4123 8042 4160 7974

34

Special weather statement, Jul 18, 2:08 PM EDT, 54 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE PITTSBURGH PA
208 PM EDT MON JUL 18 2011

PAZ013>016-022-023-181845-
ARMSTRONG PA-BUTLER PA-CLARION PA-INDIANA PA-JEFFERSON PA-LAWRENCE PA-
208 PM EDT MON JUL 18 2011

...STRONG THUNDERSTORMS WILL AFFECT ARMSTRONG...EXTREME EAST CENTRAL
LAWRENCE...NORTH CENTRAL INDIANA...NORTHERN BUTLER...SOUTHERN CLARION
AND SOUTHERN JEFFERSON COUNTIES...

AT 205 PM EDT...STRONG THUNDERSTORMS WERE ALONG A LINE FROM 3 MILES
NORTH OF LIMESTONE TO 3 MILES WEST OF BRADYS BEND...MOVING SOUTHEAST
AT 35 MPH.

WIND GUSTS TO 40 MPH AND HAIL UP TO DIME SIZE ARE POSSIBLE WITH THESE
STORMS. IN ADDITION...HEAVY RAIN WILL CAUSE REDUCED VISIBILITIES AND
PONDING ON ROADWAYS AND IN LOW LYING AREAS.

SOME LOCATIONS THAT WILL BE IMPACTED INCLUDE...
  SLIPPERY ROCK...      SLIGO...              HOOKER...
  EAU CLAIRE...         CLARION...            CHICORA...
  BRADYS BEND...        LIMESTONE...          RIMERSBURG...
  EAST BRADY...         SUMMERVILLE...        CLIMAX...

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

LAT...LON 4064 7958 4105 8017 4125 7938 4104 7880
      4102 7880

34

Local storm report, Jul 18, 2:37 PM EDT, 25 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE PITTSBURGH PA
237 PM EDT MON JUL 18 2011

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

0105 PM     TSTM WND DMG     5 SW FRANKLIN           41.34N  79.91W
07/18/2011                   VENANGO            PA   TRAINED SPOTTER

            LARGE TREE REPORTED DOWN ON POWER-LINES

&&

EVENT NUMBER PBZ1100951

JD

Special weather statement, Jul 18, 2:48 PM EDT, 14 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE PITTSBURGH PA
248 PM EDT MON JUL 18 2011

PAZ013-014-021-022-181945-
ALLEGHENY PA-ARMSTRONG PA-BUTLER PA-LAWRENCE PA-
248 PM EDT MON JUL 18 2011

...A STRONG THUNDERSTORM WILL AFFECT BUTLER...EAST CENTRAL
LAWRENCE...NORTHEASTERN ALLEGHENY AND WEST CENTRAL ARMSTRONG
COUNTIES...

AT 244 PM EDT...A STRONG THUNDERSTORM WAS LOCATED 3 MILES NORTHEAST
OF MORAINE STATE PARK...MOVING SOUTHEAST AT 20 MPH.

WIND GUSTS TO 40 MPH AND HAIL UP TO DIME SIZE ARE POSSIBLE WITH THIS
STORM. IN ADDITION...HEAVY RAINFALL CAN CREATED REDUCED VISIBILITIES
AND PONDING ON ROADWAYS AND IN LOW LYING AREAS.

SOME LOCATIONS THAT WILL BE IMPACTED INCLUDE...
  SLIPPERY ROCK...      MORAINE STATE PARK... MCCONNELLS MILL...
  BUTLER...             CHICORA...            SAXONBURG...
  SARVER...             RUSSELLTON...         LERNERVILLE...

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

LAT...LON 4083 7950 4055 7984 4097 8021 4110 8005

34

Special weather statement, Jul 18, 2:53 PM EDT, 9 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE PITTSBURGH PA
253 PM EDT MON JUL 18 2011

PAZ016-023-181915-
INDIANA PA-JEFFERSON PA-
253 PM EDT MON JUL 18 2011

...STRONG THUNDERSTORMS WILL AFFECT INDIANA AND SOUTHEASTERN
JEFFERSON COUNTIES...

AT 249 PM EDT...STRONG THUNDERSTORMS WERE ALONG A LINE FROM 5 MILES
SOUTH OF REYNOLDSVILLE TO 5 MILES NORTHWEST OF HOMER CITY...MOVING
EAST AT 35 MPH.

WIND GUSTS TO 40 MPH AND HAIL UP TO DIME SIZE ARE POSSIBLE WITH THESE
STORMS. IN ADDITION...HEAVY RAIN WILL CAUSE REDUCED VISIBILITIES AND
PONDING ON ROADWAYS AND IN LOW LYING AREAS.

SOME LOCATIONS THAT WILL BE IMPACTED INCLUDE...
  SHELOCTA...           REYNOLDSVILLE...      PUNXSUTAWNEY...
  PLUMVILLE...          MARION CENTER...      INDIANA...
  HOMER CITY...         CLYMER...             GLEN CAMPBELL...
  YELLOW CREEK STATE PARK...                  ARMAGH...

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

LAT...LON 4063 7884 4041 7896 4059 7939 4111 7894
      4109 7880 4072 7880

34

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 18, 12:15 PM EDT	Special Weather Statement	PBZ	Venango	60 min
Jul 18, 12:44 PM EDT	Severe Thunderstorm Warning	PBZ	Forest, Mercer, Venango	31 min
Jul 18, 1:15 PM EDT	Special Weather Statement	PBZ	Butler, Mercer, Venango	45 min
Jul 18, 2:08 PM EDT	Special Weather Statement	PBZ	Armstrong, Butler, Clarion	37 min
Jul 18, 2:48 PM EDT	Special Weather Statement	PBZ	Butler	57 min
Jul 18, 2:53 PM EDT	Special Weather Statement	PBZ	Indiana	22 min
Jul 18, 3:29 PM EDT	Severe Thunderstorm Warning	PBZ	Allegheny, Butler, Westmoreland	46 min
Jul 18, 4:21 PM EDT	Special Weather Statement	PBZ	Allegheny	39 min
Jul 18, 5:12 PM EDT	Special Weather Statement	PBZ	Allegheny	48 min
Jul 18, 5:22 PM EDT	Severe Thunderstorm Warning	PBZ	Allegheny, Fayette, Greene, Washington, Westmoreland	38 min
Jul 18, 5:39 PM EDT	Special Weather Statement	PBZ	Allegheny	51 min
Jul 18, 5:56 PM EDT	Severe Thunderstorm Warning	PBZ	Beaver	34 min
Jul 18, 5:59 PM EDT	Areal Flood Warning	PBZ	Allegheny, Beaver	4 hr
Jul 18, 6:11 PM EDT	Severe Thunderstorm Warning	PBZ	Allegheny, Beaver, Butler, Washington	64 min
Jul 18, 6:47 PM EDT	Severe Thunderstorm Warning	PBZ	Washington	43 min
Jul 18, 7:12 PM EDT	Severe Thunderstorm Warning	PBZ	Allegheny, Washington	48 min
Jul 18, 7:21 PM EDT	Severe Thunderstorm Warning	PBZ	Greene, Washington	39 min
Jul 18, 3:53 PM EDT	Severe Thunderstorm Warning	PBZ	Guernsey, Harrison, Tuscarawas	52 min
Jul 18, 4:55 PM EDT	Severe Thunderstorm Warning	PBZ	Carroll, Harrison, Tuscarawas	20 min
Jul 18, 5:07 PM EDT	Severe Thunderstorm Warning	PBZ	Belmont, Guernsey, Harrison, Tuscarawas	38 min
Jul 18, 5:17 PM EDT	Severe Thunderstorm Warning	PBZ	Columbiana	43 min
Jul 18, 5:48 PM EDT	Severe Thunderstorm Warning	PBZ	Belmont, Guernsey, Noble	42 min
Jul 18, 6:17 PM EDT	Areal Flood Warning	PBZ	Guernsey, Tuscarawas	3 hr
Jul 18, 7:33 PM EDT	Severe Thunderstorm Warning	PBZ	Coshocton, Guernsey, Muskingum	42 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.