Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 1991

Severe Thunderstorm Warning 41, NWS State College, PA

July 23, 1991Clinton County, Pennsylvania

NWS State College, PA issued this severe thunderstorm warning at Jul 23, 1991, 2:37 PM EDT for Clinton County, Pennsylvania. It was in force for 68 min.

The area

The counties it named.

The facts

Issued
Jul 23, 1991, 2:37 PM EDT (18:37 UTC)
Expired
Jul 23, 1991, 3:45 PM EDT
In force
68 min
Issued by
NWS State College, PA
Area
Whole counties

County Clinton County, PA

The nearest sounding before it

Pittsburgh, PA (KPIT), launched 12:00Z, 6.6 hours before the alert went out and 227 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, Pittsburgh, PA at 12:00Z on 1991-07-23Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1248 joules per kilogram.LCLLFCEL10008507005003002001001 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, Pittsburgh, PA at 12:00Z on 1991-07-23The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 126 square meters per square second.193958Sfc1 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
1248 J/kg
Mixed-layer CIN
-48 J/kg
Mixed-layer LCL
1003 m above ground
0-6 km bulk shear
27 kt
0-1 km storm-relative helicity
126 m²/s²
0-3 km storm-relative helicity
72 m²/s²
Significant tornado parameter
0.4
Supercell composite
1.5

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.

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 23, 1:05 PM EDTSevere Thunderstorm WarningCTPTioga55 min
Jul 23, 1:33 PM EDTSevere Thunderstorm WarningCTPBradford57 min
Jul 23, 2:08 PM EDTSevere Thunderstorm WarningCTPLycoming67 min
Jul 23, 3:09 PM EDTSevere Thunderstorm WarningCTPCentre66 min
Jul 23, 3:14 PM EDTSevere Thunderstorm WarningCTPLycoming46 min
Jul 23, 3:32 PM EDTSevere Thunderstorm WarningCTPCarbon43 min
Jul 23, 3:43 PM EDTSevere Thunderstorm WarningCTPHuntingdon, Mifflin62 min
Jul 23, 3:51 PM EDTSevere Thunderstorm WarningCTPMontour, Northumberland54 min

Nearby

Severe Thunderstorm Warnings in Pennsylvania, 1991Every 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.