Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2023

Severe Thunderstorm Warning 146, NWS State College, PA

August 12, 2023Lancaster County, Pennsylvania

NWS State College, PA issued this severe thunderstorm warning at Aug 12, 2023, 11:59 PM EDT for Lancaster County, Pennsylvania. It was in force for 46 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: Aug 12, 2023, 11:59 PM EDT (03:59 UTC)
Expired: Aug 13, 2023, 12:45 AM EDT
In force: 46 min
Issued by: NWS State College, PA
Area: Storm-based polygon
Hail: 0.88 in
Wind: 60.0 mph

County Lancaster County, PA

The radar

The Dover AFB radar (KDOX), 152 km from the middle of the area, began a volume at 04:00 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

Washington/Dulle, VA (KIAD), launched 00:00Z, 4.0 hours before the alert went out and 157 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: 1089 J/kg
Mixed-layer CIN: -18 J/kg
Mixed-layer LCL: 1619 m above ground
0-6 km bulk shear: 44 kt
0-1 km storm-relative helicity: 118 m²/s²
0-3 km storm-relative helicity: 168 m²/s²
Significant tornado parameter: 0.3
Supercell composite: 3.9

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 State College, PA wrote its last area forecast discussion before this severe thunderstorm warning went out at Aug 12, 9:04 PM EDT, 2 hours 55 minutes earlier.

Area forecast discussion, Aug 12, 9:04 PM EDT, 2 hours 55 minutes before

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Hazardous weather outlook, Aug 12, 11:14 PM EDT, 45 minutes before

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In the hours before

Special weather statement, Aug 12, 9:56 PM EDT, 2 hours 3 minutes before

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Special weather statement, Aug 12, 9:58 PM EDT, 2 hours 1 minute before

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Special weather statement, Aug 12, 10:08 PM EDT, 1 hour 51 minutes before

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Local storm report, Aug 12, 10:13 PM EDT, 1 hour 46 minutes before

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Special weather statement, Aug 12, 11:17 PM EDT, 42 minutes before

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Special weather statement, Aug 12, 11:49 PM EDT, 10 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 12, 8:36 PM EDT	Severe Thunderstorm Warning	CTP	Blair, Cambria	39 min
Aug 12, 8:52 PM EDT	Tornado Warning	CTP	Cambria	38 min
Aug 12, 9:10 PM EDT	Severe Thunderstorm Warning	CTP	Blair, Cambria	50 min
Aug 12, 9:43 PM EDT	Special Weather Statement	CTP	Huntingdon	32 min
Aug 12, 9:56 PM EDT	Special Weather Statement	CTP	Dauphin, Lebanon	49 min
Aug 12, 9:58 PM EDT	Special Weather Statement	CTP	Somerset	32 min
Aug 12, 10:08 PM EDT	Special Weather Statement	CTP	Huntingdon	22 min
Aug 12, 10:34 PM EDT	Areal Flood Advisory	CTP	Cumberland, Dauphin, Juniata, Lebanon, Perry, Schuylkill	116 min
Aug 12, 11:17 PM EDT	Special Weather Statement	CTP	Lebanon	28 min
Aug 12, 11:49 PM EDT	Special Weather Statement	CTP	Lancaster	56 min

Nearby

Severe Thunderstorm Warnings in Pennsylvania, 2023 Every severe thunderstorm warning in 2023

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.