Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2008

Severe Thunderstorm Warning 108, NWS State College, PA

July 20, 2008Lancaster County, York County, Pennsylvania

NWS State College, PA issued this severe thunderstorm warning at Jul 20, 2008, 8:19 PM EDT for Lancaster County, York County, Pennsylvania. It was in force for 26 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 20, 2008, 8:19 PM EDT (00:19 UTC)
Expired: Jul 20, 2008, 8:45 PM EDT
In force: 26 min
Issued by: NWS State College, PA
Area: Storm-based polygon

Counties Lancaster County, PA, York County, PA

The radar

The Sterling radar (KLWX), 141 km from the middle of the area, began a volume at 00:21 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, 0.3 hours before the alert went out and 139 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: 143 J/kg
Mixed-layer CIN: -48 J/kg
Mixed-layer LCL: 1969 m above ground
0-6 km bulk shear: 22 kt
0-1 km storm-relative helicity: 82 m²/s²
0-3 km storm-relative helicity: 146 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.4

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 Jul 20, 7:48 PM EDT, 31 minutes earlier.

Area forecast discussion, Jul 20, 7:48 PM EDT, 31 minutes before

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Hazardous weather outlook, Jul 20, 7:13 PM EDT, 1 hour 6 minutes before

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In the hours before

Local storm report, Jul 20, 5:18 PM EDT, 3 hours 1 minute before

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Special weather statement, Jul 20, 5:46 PM EDT, 2 hours 33 minutes before

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Local storm report, Jul 20, 5:59 PM EDT, 2 hours 20 minutes before

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Special weather statement, Jul 20, 6:30 PM EDT, 1 hour 49 minutes before

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Special weather statement, Jul 20, 6:31 PM EDT, 1 hour 48 minutes before

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Special weather statement, Jul 20, 7:30 PM EDT, 49 minutes before

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Nearby

Severe Thunderstorm Warnings in Pennsylvania, 2008 Every severe thunderstorm warning in 2008

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.