Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 1991

Severe Thunderstorm Warning 31, NWS State College, PA

July 7, 1991Centre County, Pennsylvania

NWS State College, PA issued this severe thunderstorm warning at Jul 7, 1991, 8:54 AM EDT for Centre County, Pennsylvania. It was in force for 66 min.

The area

The counties it named.

The facts

Issued: Jul 7, 1991, 8:54 AM EDT (12:54 UTC)
Expired: Jul 7, 1991, 10:00 AM EDT
In force: 66 min
Issued by: NWS State College, PA
Area: Whole counties

County Centre County, PA

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 12:00Z, 0.9 hours before the alert went out and 222 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: 1279 J/kg
Mixed-layer CIN: -100 J/kg
Mixed-layer LCL: 1270 m above ground
0-6 km bulk shear: 15 kt
0-1 km storm-relative helicity: 93 m²/s²
0-3 km storm-relative helicity: 46 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.

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.

In the hours before

Special weather statement, Jul 7, 6:05 AM EDT, 2 hours 49 minutes before

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Special weather statement, Jul 7, 6:13 AM EDT, 2 hours 41 minutes before

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Special weather statement, Jul 7, 6:40 AM EDT, 2 hours 14 minutes before

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Special weather statement, Jul 7, 7:10 AM EDT, 1 hour 44 minutes before

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Special weather statement, Jul 7, 8:00 AM EDT, 54 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
Jul 7, 10:38 AM EDT	Severe Thunderstorm Warning	CTP	Lehigh	67 min
Jul 7, 12:06 PM EDT	Severe Thunderstorm Warning	CTP	Huntingdon, Mifflin	54 min
Jul 7, 12:44 PM EDT	Severe Thunderstorm Warning	CTP	Huntingdon	31 min
Jul 7, 12:56 PM EDT	Severe Thunderstorm Warning	CTP	York	49 min
Jul 7, 1:04 PM EDT	Severe Thunderstorm Warning	CTP	Adams	26 min
Jul 7, 1:22 PM EDT	Tornado Warning	CTP	York	23 min
Jul 7, 1:45 PM EDT	Severe Thunderstorm Warning	CTP	York	30 min

Nearby

Severe Thunderstorm Warnings in Pennsylvania, 1991 Every severe thunderstorm warning in 1991

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.