Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2010

Severe Thunderstorm Warning 207, NWS State College, PA

October 11, 20105 counties in Pennsylvania

NWS State College, PA issued this severe thunderstorm warning at Oct 11, 2010, 4:28 PM EDT for 5 counties in Pennsylvania. It was in force for 77 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
Oct 11, 2010, 4:28 PM EDT (20:28 UTC)
Expired
Oct 11, 2010, 5:45 PM EDT
In force
77 min
Issued by
NWS State College, PA
Area
Storm-based polygon

Counties Columbia County, PA, Lycoming County, PA, Montour County, PA, Sullivan County, PA, Tioga County, PA

The radar

The State College radar (KCCX), 112 km from the middle of the area, began a volume at 20:31 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.

IssuedProductOfficeLasted
Oct 11, 3:38 PM EDTSevere Thunderstorm WatchSPC6 hr

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 12:00Z, 8.5 hours before the alert went out and 270 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-pSkew-T log-p diagram, Washington/Dulle, VA at 12:00Z on 2010-10-11Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Washington/Dulle, VA at 12:00Z on 2010-10-11The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 94 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
0 m above ground
0-6 km bulk shear
32 kt
0-1 km storm-relative helicity
94 m²/s²
0-3 km storm-relative helicity
58 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The office that day

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

IssuedProductOfficeCountiesLasted
Oct 11, 2:32 PM EDTSpecial Weather StatementCTPClinton43 min
Oct 11, 2:49 PM EDTSpecial Weather StatementCTPPotter26 min
Oct 11, 2:53 PM EDTSpecial Weather StatementCTPClinton37 min
Oct 11, 2:55 PM EDTSpecial Weather StatementCTPMifflin35 min
Oct 11, 2:56 PM EDTSevere Thunderstorm WarningCTPCentre, Mifflin, Union47 min
Oct 11, 3:15 PM EDTSevere Thunderstorm WarningCTPCentre, Clinton, Lycoming, Union36 min
Oct 11, 3:19 PM EDTSevere Thunderstorm WarningCTPLycoming, Potter, Tioga56 min
Oct 11, 3:23 PM EDTSpecial Weather StatementCTPTioga52 min
Oct 11, 3:33 PM EDTSevere Thunderstorm WarningCTPColumbia, Dauphin, Juniata, Lycoming, Montour, Northumberland and 4 more57 min
Oct 11, 3:47 PM EDTSevere Thunderstorm WarningCTPPotter, Tioga73 min
Oct 11, 4:14 PM EDTSpecial Weather StatementCTPSullivan61 min
Oct 11, 4:37 PM EDTSevere Thunderstorm WarningCTPSchuylkill38 min
Oct 11, 5:17 PM EDTSpecial Weather StatementCTPPotter58 min
Oct 11, 5:35 PM EDTSpecial Weather StatementCTPSullivan70 min
Oct 11, 5:46 PM EDTSpecial Weather StatementCTPBlair44 min
Oct 11, 6:01 PM EDTSevere Thunderstorm WarningCTPClinton, Lycoming, Potter74 min
Oct 11, 6:16 PM EDTSpecial Weather StatementCTPCameron, Clinton74 min
Oct 11, 6:21 PM EDTSpecial Weather StatementCTPCambria54 min
Oct 11, 7:00 PM EDTSevere Thunderstorm WarningCTPLycoming, Montour, Northumberland, Union60 min
Oct 11, 7:09 PM EDTSpecial Weather StatementCTPBlair, Cambria, Huntingdon, Juniata, Mifflin66 min
Oct 11, 7:52 PM EDTSpecial Weather StatementCTPColumbia53 min
Oct 11, 7:58 PM EDTSpecial Weather StatementCTPClearfield47 min

Nearby

Severe Thunderstorm Warnings in Pennsylvania, 2010Every severe thunderstorm warning 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.