Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2015

Severe Thunderstorm Warning 25, NWS Pittsburgh, PA

May 11, 20154 counties in Pennsylvania

NWS Pittsburgh, PA issued this severe thunderstorm warning at May 11, 2015, 8:45 PM EDT for 4 counties in Pennsylvania. It was in force for 45 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 11, 2015, 8:45 PM EDT (00:45 UTC)
Expired: May 11, 2015, 9:30 PM EDT
In force: 45 min
Issued by: NWS Pittsburgh, PA
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Clarion County, PA, Forest County, PA, Mercer County, PA, Venango County, PA

The radar

The Pittsburgh radar (KPBZ), 102 km from the middle of the area, began a volume at 00:47 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
May 11, 5:47 PM EDT	Severe Thunderstorm Watch	SPC	4 hr

The nearest sounding before it

Pittsburgh, PA (KAGC), launched 00:00Z, 0.8 hours before the alert went out and 111 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: 473 J/kg
Mixed-layer CIN: -9 J/kg
Mixed-layer LCL: 1868 m above ground
0-6 km bulk shear: 24 kt
0-1 km storm-relative helicity: 78 m²/s²
0-3 km storm-relative helicity: 160 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.9

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 11, 8:32 PM EDT, 13 minutes earlier.

Area forecast discussion, May 11, 8:32 PM EDT, 13 minutes before

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Hazardous weather outlook, May 11, 8:22 PM EDT, 23 minutes before

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In the hours before

Special weather statement, May 11, 7:13 PM EDT, 1 hour 32 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE PITTSBURGH PA
713 PM EDT MON MAY 11 2015

OHZ039-049-058-059-068-069-WVZ012-120000-
GUERNSEY-MONROE-HARRISON-TUSCARAWAS-NOBLE-BELMONT-WETZEL-
713 PM EDT MON MAY 11 2015

...A LINE OF STRONG THUNDERSTORMS WILL AFFECT NOBLE...GUERNSEY...
MONROE...SOUTHWESTERN HARRISON...SOUTH CENTRAL TUSCARAWAS...BELMONT
AND NORTHWESTERN WETZEL COUNTIES...

AT 712 PM EDT...A LINE OF STRONG THUNDERSTORMS WAS ALONG A LINE
EXTENDING FROM 8 MILES SOUTH OF NEWCOMERSTOWN TO 10 MILES NORTH OF
MARIETTA...AND MOVING EAST AT 45 MPH.

WINDS IN EXCESS OF 40 MPH ARE POSSIBLE WITH THESE STORMS.

LOCATIONS IMPACTED INCLUDE...
CAMBRIDGE...NEW MARTINSVILLE...BARNESVILLE...CADIZ...WOODSFIELD...
CALDWELL...FREEPORT...PADEN CITY...BYESVILLE...DUDLEY...BETHESDA...
ANTRIM...FLUSHING...LONDONDERRY...QUAKER CITY...SARDIS...
SENECAVILLE...BELMONT...PLEASANT CITY AND BEALLSVILLE.

THIS INCLUDES THE FOLLOWING HIGHWAYS...
  INTERSTATE 70 IN OHIO BETWEEN MILE MARKERS 176 AND 214.
  INTERSTATE 77 IN OHIO BETWEEN MILE MARKERS 18 AND 61.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 1000 PM EDT FOR
EAST CENTRAL OHIO. A SEVERE THUNDERSTORM WATCH ALSO REMAINS IN EFFECT
UNTIL 100 AM EDT FOR EAST CENTRAL OHIO AND NORTHERN WEST VIRGINIA.

LAT...LON 4022 8167 4033 8102 3978 8086 3976 8087
      3956 8079 3956 8082 3960 8085 3961 8095
      3954 8104 3957 8104 3958 8126 3961 8127
      3959 8129 3959 8136 3965 8145 3964 8147
      3958 8147 3958 8151 4015 8168
TIME...MOT...LOC 2312Z 265DEG 40KT 4015 8160 3957 8143

33

Local storm report, May 11, 7:39 PM EDT, 1 hour 6 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE PITTSBURGH PA
739 PM EDT MON MAY 11 2015

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

0655 PM     TSTM WND DMG     1 W GNADENHUTTEN        40.36N  81.45W
05/11/2015                   TUSCARAWAS         OH   911 CALL CENTER

            1 TREE DOWN

0659 PM     TSTM WND DMG     1 SW MIDVALE            40.43N  81.38W
05/11/2015                   TUSCARAWAS         OH   911 CALL CENTER

            1 TREE DOWN

&&

EVENT NUMBER PBZ1501685
EVENT NUMBER PBZ1501686

24

Special weather statement, May 11, 7:46 PM EDT, 59 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE PITTSBURGH PA
746 PM EDT MON MAY 11 2015

OHZ049-050-WVZ001-002-120015-
JEFFERSON-HARRISON-BROOKE-HANCOCK-
746 PM EDT MON MAY 11 2015

...A STRONG THUNDERSTORM WILL AFFECT JEFFERSON...EASTERN HARRISON...
SOUTH CENTRAL HANCOCK AND NORTHEASTERN BROOKE COUNTIES...

AT 746 PM EDT...A STRONG THUNDERSTORM WAS NEAR CADIZ...MOVING
NORTHEAST AT 40 MPH.

WIND GUSTS UP TO 50 MPH ARE POSSIBLE WITH THIS STORM.

LOCATIONS IMPACTED INCLUDE...
WEIRTON...STEUBENVILLE...CADIZ...WELLSBURG...TORONTO...
WINTERSVILLE...MINGO JUNCTION...FOLLANSBEE...HOOVERSON HEIGHTS...
HOPEDALE...SMITHFIELD...ADENA...JEWETT...BRILLIANT...RICHMOND...
HOLLOWAY...NEW ATHENS...NEW ALEXANDRIA...BLOOMINGDALE AND UNIONPORT.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 100 AM EDT FOR
EAST CENTRAL OHIO AND NORTHERN WEST VIRGINIA.

LAT...LON 4043 8095 4043 8094 4044 8093 4056 8067
      4033 8052 4032 8052 4016 8102 4017 8116
      4029 8123
TIME...MOT...LOC 2346Z 243DEG 40KT 4025 8110

33

Local storm report, May 11, 8:00 PM EDT, 45 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE PITTSBURGH PA
800 PM EDT MON MAY 11 2015

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

0710 PM     TSTM WND DMG     MALVERN                 40.68N  81.18W
05/11/2015                   CARROLL            OH   911 CALL CENTER

            NUMEROUS TREES DOWN AROUND MALVERN

0713 PM     TSTM WND DMG     4 SSE MALVERN           40.64N  81.15W
05/11/2015                   CARROLL            OH   911 CALL CENTER

            TREES DOWN ON BRONZE ROAD

0715 PM     TSTM WND DMG     CARROLLTON              40.58N  81.09W
05/11/2015                   CARROLL            OH   911 CALL CENTER

            NUMEROUS TREES DOWN AROUND CARROLLTON

0715 PM     TSTM WND DMG     3 NNW CARROLLTON        40.62N  81.12W
05/11/2015                   CARROLL            OH   911 CALL CENTER

            TREES DOWN ON WAYNESBURG ROAD

&&

EVENT NUMBER PBZ1501687
EVENT NUMBER PBZ1501688
EVENT NUMBER PBZ1501689
EVENT NUMBER PBZ1501690

24

Special weather statement, May 11, 8:11 PM EDT, 34 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE PITTSBURGH PA
811 PM EDT MON MAY 11 2015

OHZ059-PAZ029-031-WVZ002>004-012-021-022-120045-
BELMONT-WASHINGTON-GREENE-MARION-MARSHALL-BROOKE-OHIO-WETZEL-
MONONGALIA-
811 PM EDT MON MAY 11 2015

...A LINE OF STRONG THUNDERSTORMS WILL AFFECT EASTERN BELMONT...
GREENE...SOUTHWESTERN WASHINGTON...WETZEL...OHIO...NORTHWESTERN
MONONGALIA...MARSHALL...MARION AND SOUTHERN BROOKE COUNTIES...

AT 809 PM EDT...A LINE OF STRONG THUNDERSTORMS WAS ALONG A LINE
EXTENDING FROM NEAR MARTINS FERRY TO NEAR WEST UNION...AND MOVING
EAST AT 40 MPH.

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

LOCATIONS IMPACTED INCLUDE...
WHEELING...FAIRMONT...WASHINGTON...MOUNDSVILLE...CANONSBURG...MARTINS
FERRY...BELLAIRE...WAYNESBURG...WARWOOD...BETHLEHEM...MANNINGTON...
WEST LIBERTY...TRIADELPHIA...AVELLA...CLEARVIEW...VALLEY GROVE...
CECIL-BISHOP...SHADYSIDE...PLEASANT VALLEY AND WOLFDALE.

THIS INCLUDES THE FOLLOWING HIGHWAYS...
  INTERSTATE 70 IN OHIO BETWEEN MILE MARKERS 220 AND 225.
  INTERSTATE 70 IN WEST VIRGINIA BETWEEN MILE MARKERS 0 AND 14.
  INTERSTATE 70 IN PENNSYLVANIA BETWEEN MILE MARKERS 0 AND 24.
  INTERSTATE 79 IN PENNSYLVANIA BETWEEN MILE MARKERS 12 AND 21...AND
  BETWEEN MILE MARKERS 22 AND 49.
  INTERSTATE 79 IN WEST VIRGINIA BETWEEN MILE MARKERS 130 AND 137.
  INTERSTATE 470 IN OHIO BETWEEN MILE MARKERS 0 AND 6.
  INTERSTATE 470 IN WEST VIRGINIA BETWEEN MILE MARKERS 0 AND 3.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 100 AM EDT FOR
EAST CENTRAL OHIO...SOUTHWESTERN PENNSYLVANIA AND NORTHERN WEST
VIRGINIA.

LAT...LON 3944 8028 3947 8048 3943 8052 3944 8060
      3948 8067 3947 8071 3958 8084 3971 8083
      3979 8085 3980 8082 3985 8082 3985 8085
      4014 8086 4016 8081 4016 8070 4021 8067
      4036 8022 4032 8014 3941 8011 3939 8019
TIME...MOT...LOC 0009Z 251DEG 34KT 4009 8079 3935 8077

33

Local storm report, May 11, 8:28 PM EDT, 17 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 11, 8:02 PM EDT	Severe Thunderstorm Warning	PBZ	Lawrence, Mercer	43 min
May 11, 8:11 PM EDT	Special Weather Statement	PBZ	Greene, Washington	34 min
May 11, 8:17 PM EDT	Severe Thunderstorm Warning	PBZ	Butler, Lawrence, Mercer, Venango	43 min
May 11, 8:25 PM EDT	Severe Thunderstorm Warning	PBZ	Allegheny, Beaver, Washington	35 min
May 11, 9:06 PM EDT	Special Weather Statement	PBZ	Allegheny, Armstrong	39 min
May 11, 9:47 PM EDT	Special Weather Statement	PBZ	Armstrong, Fayette, Indiana, Jefferson, Westmoreland	58 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.