Alert archive / Delaware / Severe Thunderstorm Warnings in 1991

Severe Thunderstorm Warning 25, NWS Wilmington, NC

July 7, 1991New Castle County, Delaware

NWS Wilmington, NC issued this severe thunderstorm warning at Jul 7, 1991, 11:42 AM EDT for New Castle County, Delaware. It was in force for 63 min.

The area

The counties it named.

The facts

Issued
Jul 7, 1991, 11:42 AM EDT (15:42 UTC)
Expired
Jul 7, 1991, 12:45 PM EDT
In force
63 min
Issued by
NWS Wilmington, NC
Area
Whole counties

County New Castle County, DE

The nearest sounding before it

Atlantic City In, NJ (KACY), launched 12:00Z, 3.7 hours before the alert went out and 99 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, Atlantic City In, NJ at 12:00Z on 1991-07-07Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1207 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Atlantic City In, NJ at 12:00Z on 1991-07-07The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 76 square meters per square second.1939Sfc1 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
1207 J/kg
Mixed-layer CIN
-109 J/kg
Mixed-layer LCL
1172 m above ground
0-6 km bulk shear
17 kt
0-1 km storm-relative helicity
76 m²/s²
0-3 km storm-relative helicity
67 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.

The office that day

Everything else NWS Wilmington, NC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jul 7, 2:15 PM EDTSevere Thunderstorm WarningILMKent, Sussex60 min
Jul 7, 3:15 PM EDTSevere Thunderstorm WarningILMKent, Sussex60 min

Nearby

Severe Thunderstorm Warnings in Delaware, 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.