Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2026

Severe Thunderstorm Warning 321, NWS Pittsburgh, PA

September 3, 2026Mercer County, Venango County, Pennsylvania

NWS Pittsburgh, PA issued this severe thunderstorm warning at Sep 3, 2026, 2:16 AM EDT for Mercer County, Venango County, 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: Sep 3, 2026, 2:16 AM EDT (06:16 UTC)
Expired: Sep 3, 2026, 3:01 AM EDT
In force: 45 min
Issued by: NWS Pittsburgh, PA
Area: Storm-based polygon
Hail: 0.0 in
Wind: 60.0 mph

Counties Mercer County, PA, Venango County, PA

The radar

The Pittsburgh radar (KPBZ), 93 km from the middle of the area, began a volume at 06:16 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 00:00Z, 6.3 hours before the alert went out and 105 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: 2581 J/kg
Mixed-layer CIN: -5 J/kg
Mixed-layer LCL: 1375 m above ground
0-6 km bulk shear: 35 kt
0-1 km storm-relative helicity: 107 m²/s²
0-3 km storm-relative helicity: 140 m²/s²
Significant tornado parameter: 0.7
Supercell composite: 7.5

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 3, 1:41 AM EDT, 35 minutes earlier.

Area forecast discussion, Sep 3, 1:41 AM EDT, 35 minutes before

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Hazardous weather outlook, Sep 3, 2:13 AM EDT, 3 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, 8:43 PM EDT	Severe Thunderstorm Warning	PBZ	Venango	47 min
Sep 2, 9:09 PM EDT	Severe Thunderstorm Warning	PBZ	Allegheny, Beaver, Butler	51 min
Sep 2, 9:39 PM EDT	Severe Thunderstorm Warning	PBZ	Armstrong, Butler	22 min
Sep 2, 11:19 PM EDT	Severe Thunderstorm Warning	PBZ	Forest	26 min
Sep 3, 3:05 AM EDT	Flash Flood Warning	PBZ	Clarion, Forest, Jefferson	3 hr
Sep 3, 5:31 AM EDT	Severe Thunderstorm Warning	PBZ	Butler, Lawrence, Mercer, Venango	59 min
Sep 3, 6:17 AM EDT	Severe Thunderstorm Warning	PBZ	Clarion, Forest, Venango	58 min
Sep 3, 6:29 AM EDT	Severe Thunderstorm Warning	PBZ	Armstrong, Butler, Clarion, Forest, Lawrence, Mercer and 1 more	46 min
Sep 3, 7:20 AM EDT	Severe Thunderstorm Warning	PBZ	Allegheny, Armstrong, Butler, Indiana, Westmoreland	40 min
Sep 3, 8:12 AM EDT	Severe Thunderstorm Warning	PBZ	Indiana, Westmoreland	48 min
Sep 3, 11:15 AM EDT	Flood Watch	PBZ	Clarion, Forest, Jefferson, Mercer, Venango	11 hr
Sep 3, 3:34 PM EDT	Severe Thunderstorm Warning	PBZ	Mercer	56 min
Sep 3, 4:02 PM EDT	Tornado Warning	PBZ	Mercer	28 min
Sep 3, 4:23 PM EDT	Severe Thunderstorm Warning	PBZ	Butler, Clarion, Forest, Lawrence, Mercer, Venango	67 min
Sep 3, 4:26 PM EDT	Severe Thunderstorm Warning	PBZ	Beaver, Lawrence	49 min
Sep 3, 4:33 PM EDT	Severe Thunderstorm Warning	PBZ	Beaver, Butler, Lawrence	42 min
Sep 3, 4:47 PM EDT	Severe Thunderstorm Warning Considerable damage threat	PBZ	Beaver	43 min
Sep 3, 4:55 PM EDT	Severe Thunderstorm Warning Considerable damage threat	PBZ	Butler, Lawrence, Mercer	35 min
Sep 3, 5:07 PM EDT	Severe Thunderstorm Warning Considerable damage threat	PBZ	Allegheny, Beaver, Butler, Lawrence, Washington	53 min
Sep 3, 5:12 PM EDT	Severe Thunderstorm Warning Considerable damage threat	PBZ	Armstrong, Butler, Clarion, Jefferson, Lawrence, Venango	48 min
Sep 3, 5:19 PM EDT	Severe Thunderstorm Warning	PBZ	Beaver	41 min
Sep 3, 5:25 PM EDT	Severe Thunderstorm Warning	PBZ	Washington	50 min
Sep 3, 5:28 PM EDT	Flash Flood Warning	PBZ	Beaver, Lawrence	5 hr
Sep 3, 5:29 PM EDT	Severe Thunderstorm Warning	PBZ	Washington	46 min
Sep 3, 5:43 PM EDT	Flash Flood Warning	PBZ	Allegheny, Beaver, Butler, Lawrence	6 hr
Sep 3, 5:47 PM EDT	Severe Thunderstorm Warning Considerable damage threat	PBZ	Allegheny, Armstrong, Beaver, Butler, Indiana, Washington and 1 more	58 min
Sep 3, 5:57 PM EDT	Severe Thunderstorm Warning Considerable damage threat	PBZ	Allegheny, Beaver, Washington	48 min
Sep 3, 6:02 PM EDT	Flash Flood Warning	PBZ	Mercer	3 hr
Sep 3, 6:09 PM EDT	Severe Thunderstorm Warning Destructive damage threat	PBZ	Allegheny, Washington	21 min
Sep 3, 6:11 PM EDT	Flash Flood Warning	PBZ	Allegheny, Armstrong, Beaver, Butler, Washington, Westmoreland	6 hr
Sep 3, 6:13 PM EDT	Severe Thunderstorm Warning	PBZ	Washington	32 min
Sep 3, 6:21 PM EDT	Severe Thunderstorm Warning Destructive damage threat	PBZ	Allegheny, Westmoreland	24 min
Sep 3, 6:34 PM EDT	Severe Thunderstorm Warning Considerable damage threat	PBZ	Allegheny, Armstrong, Fayette, Indiana, Westmoreland	41 min
Sep 3, 6:36 PM EDT	Tornado Warning	PBZ	Westmoreland	24 min
Sep 3, 6:38 PM EDT	Flash Flood Warning	PBZ	Allegheny, Armstrong, Indiana, Westmoreland	6 hr
Sep 3, 6:40 PM EDT	Severe Thunderstorm Warning	PBZ	Allegheny, Fayette, Greene, Washington, Westmoreland	24 min
Sep 3, 6:46 PM EDT	Severe Thunderstorm Warning Destructive damage threat	PBZ	Fayette, Westmoreland	44 min
Sep 3, 6:51 PM EDT	Severe Thunderstorm Warning	PBZ	Lawrence, Mercer, Venango	54 min
Sep 3, 6:53 PM EDT	Tornado Warning	PBZ	Fayette, Westmoreland	37 min
Sep 3, 6:56 PM EDT	Tornado Warning	PBZ	Westmoreland	23 min
Sep 3, 6:57 PM EDT	Flash Flood Warning	PBZ	Fayette, Indiana, Westmoreland	6 hr
Sep 3, 7:08 PM EDT	Severe Thunderstorm Warning Considerable damage threat	PBZ	Fayette, Indiana, Westmoreland	37 min
Sep 3, 7:29 PM EDT	Flash Flood Warning	PBZ	Lawrence, Mercer	3 hr
Sep 3, 7:51 PM EDT	Flash Flood Warning	PBZ	Beaver	2 hr
Sep 3, 7:54 PM EDT	Severe Thunderstorm Warning	PBZ	Washington	51 min
Sep 3, 3:11 PM EDT	Severe Thunderstorm Warning	PBZ	Coshocton, Muskingum	49 min
Sep 3, 3:47 PM EDT	Severe Thunderstorm Warning	PBZ	Guernsey, Muskingum	43 min

Nearby

Severe Thunderstorm Warnings in Pennsylvania, 2026 Every severe thunderstorm warning in 2026

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.