Alert archive / Iowa / Severe Thunderstorm Warnings in 1991

Severe Thunderstorm Warning 22, NWS Quad Cities, IA

April 28, 1991Dubuque County, Iowa; Grant County, Wisconsin

NWS Quad Cities, IA issued this severe thunderstorm warning at Apr 28, 1991, 6:43 PM CDT for Dubuque County, Iowa; Grant County, Wisconsin. It was in force for 52 min.

The area

The counties it named.

The facts

Issued
Apr 28, 1991, 6:43 PM CDT (23:43 UTC)
Expired
Apr 28, 1991, 7:35 PM CDT
In force
52 min
Issued by
NWS Quad Cities, IA
Area
Whole counties

Counties Dubuque County, IA, Grant County, WI

The nearest sounding before it

Green Bay/Straub, WI (KGRB), launched 12:00Z, 11.7 hours before the alert went out and 296 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, Green Bay/Straub, WI at 12:00Z on 1991-04-28Temperature 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, Green Bay/Straub, WI at 12:00Z on 1991-04-28The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -9 square meters per square second.1939587897117136Sfc1 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
1860 m above ground
0-6 km bulk shear
53 kt
0-1 km storm-relative helicity
-9 m²/s²
0-3 km storm-relative helicity
158 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 Quad Cities, IA issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Apr 28, 11:30 AM CDTSevere Thunderstorm WarningDVNDubuque, Jackson, Jones60 min
Apr 28, 5:30 PM CDTSevere Thunderstorm WarningDVNDubuque, Jackson, Jones44 min
Apr 28, 6:53 PM CDTSevere Thunderstorm WarningDVNLafayette52 min

Nearby

Severe Thunderstorm Warnings in Iowa, 1991Severe Thunderstorm Warnings in Wisconsin, 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.