Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2013

Severe Thunderstorm Warning 221, NWS Pittsburgh, PA

September 2, 2013Armstrong County, Indiana County, Jefferson County, Pennsylvania

NWS Pittsburgh, PA issued this severe thunderstorm warning at Sep 2, 2013, 1:42 PM EDT for Armstrong County, Indiana County, Jefferson County, Pennsylvania. It was in force for 33 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 2, 2013, 1:42 PM EDT (17:42 UTC)
Expired: Sep 2, 2013, 2:15 PM EDT
In force: 33 min
Issued by: NWS Pittsburgh, PA
Area: Storm-based polygon

Counties Armstrong County, PA, Indiana County, PA, Jefferson County, PA

The radar

The Pittsburgh radar (KPBZ), 95 km from the middle of the area, began a volume at 17:43 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, 5.7 hours before the alert went out and 92 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: 1628 J/kg
Mixed-layer CIN: -13 J/kg
Mixed-layer LCL: 595 m above ground
0-6 km bulk shear: 22 kt
0-1 km storm-relative helicity: 57 m²/s²
0-3 km storm-relative helicity: 61 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.8

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 2, 12:01 PM EDT, 1 hour 41 minutes earlier.

Area forecast discussion, Sep 2, 12:01 PM EDT, 1 hour 41 minutes before

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Hazardous weather outlook, Sep 2, 2:32 AM EDT, 11 hours 10 minutes before

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In the hours before

Special weather statement, Sep 2, 1:24 PM EDT, 18 minutes before

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Special weather statement, Sep 2, 1:33 PM EDT, 9 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
Sep 2, 1:24 PM EDT	Special Weather Statement	PBZ	Jefferson	36 min
Sep 2, 1:33 PM EDT	Special Weather Statement	PBZ	Armstrong	27 min
Sep 2, 2:43 PM EDT	Special Weather Statement	PBZ	Indiana	32 min
Sep 2, 2:58 PM EDT	Special Weather Statement	PBZ	Forest	32 min
Sep 2, 3:05 PM EDT	Severe Thunderstorm Warning	PBZ	Forest	40 min
Sep 2, 4:51 PM EDT	Special Weather Statement	PBZ	Jefferson	39 min
Sep 2, 5:01 PM EDT	Special Weather Statement	PBZ	Jefferson	44 min
Sep 2, 5:09 PM EDT	Severe Thunderstorm Warning	PBZ	Indiana, Jefferson	51 min
Sep 2, 6:02 PM EDT	Special Weather Statement	PBZ	Indiana	43 min
Sep 2, 6:21 PM EDT	Severe Thunderstorm Warning	PBZ	Indiana	39 min
Sep 2, 7:00 PM EDT	Special Weather Statement	PBZ	Indiana	45 min
Sep 2, 3:48 PM EDT	Severe Thunderstorm Warning	PBZ	Carroll, Columbiana, Harrison, Jefferson, Tuscarawas	57 min
Sep 2, 4:30 PM EDT	Severe Thunderstorm Warning	PBZ	Carroll, Coshocton, Harrison, Jefferson, Tuscarawas	60 min
Sep 2, 5:30 PM EDT	Special Weather Statement	PBZ	Harrison, Jefferson	45 min

Nearby

Severe Thunderstorm Warnings in Pennsylvania, 2013 Every severe thunderstorm warning in 2013

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.