Alert archive / Pennsylvania / Tornado Warnings in 2010

Tornado Warning 10, NWS Pittsburgh, PA

July 24, 20104 counties in Pennsylvania

NWS Pittsburgh, PA issued this tornado warning at Jul 24, 2010, 7:41 PM EDT for 4 counties in 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: Jul 24, 2010, 7:41 PM EDT (23:41 UTC)
Expired: Jul 24, 2010, 8:15 PM EDT
In force: 34 min
Issued by: NWS Pittsburgh, PA
Area: Storm-based polygon

Counties Clarion County, PA, Forest County, PA, Jefferson County, PA, Venango County, PA

The radar

The Pittsburgh radar (KPBZ), 113 km from the middle of the area, began a volume at 23:40 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
Jul 24, 6:10 PM EDT	Severe Thunderstorm Watch	SPC	4 hr

The nearest sounding before it

Pittsburgh, PA (KPIT), launched 12:00Z, 11.7 hours before the alert went out and 118 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: 848 J/kg
Mixed-layer CIN: -77 J/kg
Mixed-layer LCL: 805 m above ground
0-6 km bulk shear: 30 kt
0-1 km storm-relative helicity: 122 m²/s²
0-3 km storm-relative helicity: 149 m²/s²
Significant tornado parameter: 0.3
Supercell composite: 4.3

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this tornado 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 tornado warning went out at Jul 24, 6:42 PM EDT, 59 minutes earlier.

Area forecast discussion, Jul 24, 6:42 PM EDT, 59 minutes before

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Hazardous weather outlook, Jul 24, 6:23 PM EDT, 1 hour 18 minutes before

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In the hours before

Special weather statement, Jul 24, 7:04 PM EDT, 37 minutes before

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Special weather statement, Jul 24, 7:06 PM EDT, 35 minutes before

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Local storm report, Jul 24, 7:33 PM EDT, 8 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
Jul 23, 9:35 PM EDT	Severe Thunderstorm Warning	PBZ	Forest, Mercer, Venango	55 min
Jul 23, 10:29 PM EDT	Special Weather Statement	PBZ	Clarion, Forest, Jefferson, Venango	61 min
Jul 23, 10:34 PM EDT	Severe Thunderstorm Warning	PBZ	Beaver, Butler, Lawrence, Mercer	56 min
Jul 23, 11:33 PM EDT	Special Weather Statement	PBZ	Armstrong, Beaver, Butler, Clarion, Jefferson	57 min
Jul 24, 12:07 AM EDT	Severe Thunderstorm Warning	PBZ	Beaver, Lawrence	53 min
Jul 24, 12:36 AM EDT	Areal Flood Advisory	PBZ	Beaver, Butler, Lawrence	3 hr
Jul 24, 1:12 AM EDT	Areal Flood Advisory	PBZ	Mercer	2 hr
Jul 24, 7:04 PM EDT	Special Weather Statement	PBZ	Forest, Venango	41 min
Jul 24, 7:06 PM EDT	Special Weather Statement	PBZ	Mercer, Venango	54 min
Jul 24, 7:09 PM EDT	Severe Thunderstorm Warning	PBZ	Clarion, Forest, Venango	51 min
Jul 24, 7:12 PM EDT	Severe Thunderstorm Warning	PBZ	Lawrence, Mercer, Venango	63 min
Jul 24, 7:56 PM EDT	Severe Thunderstorm Warning	PBZ	Beaver, Butler, Lawrence	64 min
Jul 24, 7:58 PM EDT	Severe Thunderstorm Warning	PBZ	Forest, Jefferson	32 min

Nearby

Tornado Warnings in Pennsylvania, 2010 Every tornado warning in 2010 Tornadoes in 2010

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.