Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2015

Severe Thunderstorm Warning 37, NWS Pittsburgh, PA

May 31, 2015Butler County, Clarion County, Venango County, Pennsylvania

NWS Pittsburgh, PA issued this severe thunderstorm warning at May 31, 2015, 1:26 PM EDT for Butler County, Clarion County, Venango County, Pennsylvania. It was in force for 34 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 31, 2015, 1:26 PM EDT (17:26 UTC)
Expired: May 31, 2015, 2:00 PM EDT
In force: 34 min
Issued by: NWS Pittsburgh, PA
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Butler County, PA, Clarion County, PA, Venango County, PA

The radar

The Pittsburgh radar (KPBZ), 83 km from the middle of the area, began a volume at 17:30 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 (KAGC), launched 12:00Z, 5.4 hours before the alert went out and 91 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: 78 J/kg
Mixed-layer CIN: -66 J/kg
Mixed-layer LCL: 964 m above ground
0-6 km bulk shear: 26 kt
0-1 km storm-relative helicity: 146 m²/s²
0-3 km storm-relative helicity: 172 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.2

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 31, 12:26 PM EDT, 1 hour earlier.

Area forecast discussion, May 31, 12:26 PM EDT, 1 hour before

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Hazardous weather outlook, May 31, 9:56 AM EDT, 3 hours 30 minutes before

HAZARDOUS WEATHER OUTLOOK...UPDATED
NATIONAL WEATHER SERVICE PITTSBURGH PA
956 AM EDT SUN MAY 31 2015

MDZ001-OHZ039>041-048>050-057>059-068-069-PAZ007>009-013>016-020>023-
029-031-073>076-WVZ001>004-012-021>023-041-011400-
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-
956 AM EDT SUN MAY 31 2015

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 SLIGHT RISK FOR SEVERE THUNDERSTORMS TODAY...WITH THE
MAIN THREATS BEING DAMAGING WINDS AND LARGE HAIL. ISOLATED
TORNADOES AND LOCALIZED FLOODING ARE ALSO POSSIBLE.

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

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

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

07

In the hours before

Special weather statement, May 31, 7:48 AM EDT, 5 hours 38 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE PITTSBURGH PA
748 AM EDT SUN MAY 31 2015

OHZ041-311215-
COLUMBIANA-
748 AM EDT SUN MAY 31 2015

...A LINE OF STRONG THUNDERSTORMS WILL AFFECT NORTHERN COLUMBIANA
COUNTY...

AT 747 AM EDT...A LINE OF STRONG THUNDERSTORMS WAS ALONG A LINE
EXTENDING FROM 6 MILES NORTH OF SALEM TO NEAR MINERVA...AND MOVING
NORTHEAST AT 30 MPH.

WIND GUSTS UP TO 50 MPH ARE POSSIBLE WITH THESE STORMS.

LOCATIONS IMPACTED INCLUDE...
SALEM...COLUMBIANA...EAST PALESTINE...LISBON...LEETONIA...NEW
WATERFORD...HANOVERTON...ROGERS...NEGLEY...WINONA...NEW GARDEN...
NORTH GEORGETOWN...GUILFORD LAKE STATE PARK...HOMEWORTH AND EAST
ROCHESTER.

LAT...LON 4090 8082 4090 8052 4074 8052 4075 8109
      4081 8109 4090 8100 4090 8090 4093 8089
      4093 8082
TIME...MOT...LOC 1147Z 245DEG 25KT 4099 8087 4077 8106

34

Special weather statement, May 31, 8:34 AM EDT, 4 hours 52 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE PITTSBURGH PA
834 AM EDT SUN MAY 31 2015

PAZ007-013-311300-
MERCER-LAWRENCE-
834 AM EDT SUN MAY 31 2015

...A LINE OF STRONG THUNDERSTORMS WILL AFFECT SOUTHERN MERCER AND
LAWRENCE COUNTIES...

AT 834 AM EDT...A LINE OF STRONG THUNDERSTORMS WAS ALONG A LINE
EXTENDING FROM NEAR MAPLEWOOD PARK TO NEAR OAKWOOD TO 7 MILES
SOUTHEAST OF BOARDMAN...AND MOVING NORTHEAST AT 30 MPH.

WIND GUSTS UP TO 50 MPH ARE POSSIBLE WITH THESE STORMS.

LOCATIONS IMPACTED INCLUDE...
NEW CASTLE...HERMITAGE...GROVE CITY...NEW WILMINGTON...OAKWOOD...NEW
CASTLE NORTHWEST...MERCER...PULASKI...BESSEMER...STONEBORO...WEST
MIDDLESEX...PLAIN GROVE TOWNSHIP...SOUTH NEW CASTLE...SANDY LAKE...
WHEATLAND...HARLANSBURG...JACKSON CENTER...VOLANT...ROSE POINT PARK
AND MAURICE K GODDARD STATE PARK.

THIS INCLUDES THE FOLLOWING HIGHWAYS...
  INTERSTATE 79 IN PENNSYLVANIA BETWEEN MILE MARKERS 106 AND 126.
  INTERSTATE 80 IN PENNSYLVANIA BETWEEN MILE MARKERS 0 AND 26.
  INTERSTATE 376 IN PENNSYLVANIA BETWEEN MILE MARKERS 4 AND 14.

LAT...LON 4117 8002 4096 8021 4094 8052 4120 8052
      4138 8007
TIME...MOT...LOC 1234Z 247DEG 28KT 4110 8050 4103 8048 4097 8055

34

Local storm report, May 31, 11:42 AM EDT, 1 hour 44 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE PITTSBURGH PA
1142 AM EDT SUN MAY 31 2015

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

1120 AM     HAIL             7 NW SIGEL              41.35N 79.22W
05/31/2015  M1.00 INCH       CLARION            PA   PARK/FOREST SRVC

            REPORTED AT COOK FOREST STATE PARK

&&

JD

Local storm report, May 31, 12:09 PM EDT, 1 hour 17 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE PITTSBURGH PA
1209 PM EDT SUN MAY 31 2015

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

1135 AM     HAIL             4 WNW SIGEL             41.31N 79.19W
05/31/2015  M1.00 INCH       JEFFERSON          PA   PUBLIC

            REPORTED AT DOUBLE DIAMOND DEER RANCH

&&

JD

The office that day

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

Issued	Product	Office	Counties	Lasted
May 31, 8:34 AM EDT	Special Weather Statement	PBZ	Lawrence, Mercer	26 min
May 31, 11:05 AM EDT	Severe Thunderstorm Warning	PBZ	Clarion, Forest, Jefferson	25 min
May 31, 11:30 AM EDT	Severe Thunderstorm Warning	PBZ	Clarion, Forest, Jefferson	30 min
May 31, 2:04 PM EDT	Special Weather Statement	PBZ	Greene	41 min
May 31, 2:20 PM EDT	Special Weather Statement	PBZ	Forest	25 min
May 31, 2:40 PM EDT	Severe Thunderstorm Warning	PBZ	Clarion, Jefferson	35 min
May 31, 4:00 PM EDT	Severe Thunderstorm Warning	PBZ	Beaver	30 min
May 31, 4:29 PM EDT	Severe Thunderstorm Warning	PBZ	Beaver, Butler, Lawrence	31 min
May 31, 4:41 PM EDT	Areal Flood Advisory	PBZ	Mercer	6 hr
May 31, 5:41 PM EDT	Severe Thunderstorm Warning	PBZ	Greene, Washington	27 min
May 31, 6:11 PM EDT	Special Weather Statement	PBZ	Clarion	64 min
May 31, 6:35 PM EDT	Severe Thunderstorm Warning	PBZ	Armstrong, Clarion, Jefferson	55 min
May 31, 6:45 PM EDT	Special Weather Statement	PBZ	Allegheny	45 min
May 31, 7:30 PM EDT	Special Weather Statement	PBZ	Armstrong, Jefferson	45 min
May 31, 7:39 PM EDT	Severe Thunderstorm Warning	PBZ	Indiana, Jefferson	36 min
May 31, 7:48 AM EDT	Special Weather Statement	PBZ	Columbiana	27 min
May 31, 6:42 PM EDT	Special Weather Statement	PBZ	Preston	63 min

Nearby

Severe Thunderstorm Warnings in Pennsylvania, 2015 Every severe thunderstorm warning in 2015

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.