Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2019

Severe Thunderstorm Warning 290, NWS Pittsburgh, PA

September 11, 2019Beaver County, Lawrence County, Pennsylvania; Columbiana County, Ohio

NWS Pittsburgh, PA issued this severe thunderstorm warning at Sep 11, 2019, 3:28 PM EDT for Beaver County, Lawrence County, Pennsylvania; Columbiana County, Ohio. It was in force for 47 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: Sep 11, 2019, 3:28 PM EDT (19:28 UTC)
Expired: Sep 11, 2019, 4:15 PM EDT
In force: 47 min
Issued by: NWS Pittsburgh, PA
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Columbiana County, OH, Beaver County, PA, Lawrence County, PA

The radar

The Pittsburgh radar (KPBZ), 39 km from the middle of the area, began a volume at 19:27 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, 7.5 hours before the alert went out and 55 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: 229 J/kg
Mixed-layer CIN: -94 J/kg
Mixed-layer LCL: 1607 m above ground
0-6 km bulk shear: 27 kt
0-1 km storm-relative helicity: 92 m²/s²
0-3 km storm-relative helicity: 91 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 Sep 11, 1:46 PM EDT, 1 hour 42 minutes earlier.

Area forecast discussion, Sep 11, 1:46 PM EDT, 1 hour 42 minutes before

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Hazardous weather outlook, Sep 11, 3:03 PM EDT, 25 minutes before

Hazardous Weather Outlook
National Weather Service Pittsburgh PA
303 PM EDT Wed Sep 11 2019

MDZ001-OHZ039>041-048>050-057>059-068-069-PAZ007>009-013>016-020>023-
029-031-073>076-WVZ001>004-012-021-509>514-121915-
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-Ridges of Eastern Monongalia and Northwestern Preston-
Preston-Eastern Preston-Western Tucker-Eastern Tucker-
303 PM EDT Wed Sep 11 2019

This Hazardous Weather Outlook is for western Maryland, east
central Ohio, northwest Pennsylvania, southwest Pennsylvania, west
central Pennsylvania, western Pennsylvania, northern West Virginia
and northern panhandle of West Virginia.

.DAY ONE...This afternoon and tonight.

Scattered thunderstorms will continue through tonight, with isolated
incidents of severe weather possible. The primary hazard will be
damaging wind, however small hail and localized heavy rainfall
cannot be ruled out.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday.

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, Sep 11, 3:08 PM EDT, 20 minutes before

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Special weather statement, Sep 11, 3:17 PM EDT, 11 minutes before

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Special weather statement, Sep 11, 3:19 PM EDT, 9 minutes before

Special Weather Statement
National Weather Service Pittsburgh PA
319 PM EDT Wed Sep 11 2019

MDZ001-WVZ511-512-111945-
Garrett-Eastern Preston-Preston-
319 PM EDT Wed Sep 11 2019

...A STRONG THUNDERSTORM WILL AFFECT NORTHWESTERN GARRETT AND
NORTHEASTERN PRESTON COUNTIES...

At 319 PM EDT, a strong thunderstorm was located 8 miles southwest of
Friendsville, or 9 miles north of Terra Alta, moving east at 15 mph.

Locations impacted include...
Friendsville...                   Accident...
Deep Creek Lake State Park...     Swallow Falls State Park...
McHenry...                        Cranesville...
McComas Beach...

This includes  Interstate 68 in MARYLAND mile marker 2 and near mile
marker 5.

LAT...LON 3953 7961 3959 7961 3964 7958 3968 7926
      3943 7927
TIME...MOT...LOC 1919Z 274DEG 13KT 3958 7953

Kramar

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 11, 3:08 PM EDT	Special Weather Statement	PBZ	Beaver	37 min
Sep 11, 3:45 PM EDT	Special Weather Statement	PBZ	Mercer	30 min
Sep 11, 4:00 PM EDT	Severe Thunderstorm Warning	PBZ	Butler, Lawrence, Mercer	45 min
Sep 11, 4:10 PM EDT	Special Weather Statement	PBZ	Mercer	35 min
Sep 11, 4:19 PM EDT	Special Weather Statement	PBZ	Venango	26 min
Sep 11, 4:34 PM EDT	Severe Thunderstorm Warning	PBZ	Beaver, Butler, Lawrence	41 min
Sep 11, 4:39 PM EDT	Special Weather Statement	PBZ	Mercer	36 min
Sep 11, 4:53 PM EDT	Special Weather Statement	PBZ	Armstrong	37 min
Sep 11, 4:59 PM EDT	Severe Thunderstorm Warning	PBZ	Allegheny, Beaver, Butler	46 min
Sep 11, 5:10 PM EDT	Severe Thunderstorm Warning	PBZ	Armstrong, Butler, Clarion, Venango	50 min
Sep 11, 5:22 PM EDT	Special Weather Statement	PBZ	Butler	38 min
Sep 11, 5:35 PM EDT	Severe Thunderstorm Warning	PBZ	Clarion, Jefferson, Venango	26 min
Sep 11, 5:37 PM EDT	Special Weather Statement	PBZ	Jefferson	23 min
Sep 11, 6:56 PM EDT	Severe Thunderstorm Warning	PBZ	Indiana	19 min
Sep 11, 7:05 PM EDT	Special Weather Statement	PBZ	Westmoreland	25 min
Sep 11, 7:09 PM EDT	Severe Thunderstorm Warning	PBZ	Westmoreland	17 min
Sep 11, 7:12 PM EDT	Special Weather Statement	PBZ	Mercer	33 min
Sep 11, 3:17 PM EDT	Special Weather Statement	PBZ	Columbiana	28 min

Nearby

Severe Thunderstorm Warnings in Pennsylvania, 2019 Severe Thunderstorm Warnings in Ohio, 2019 Every severe thunderstorm warning in 2019

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.