Alert archive / Iowa / Severe Thunderstorm Warnings in 1991

Severe Thunderstorm Warning 28, NWS Quad Cities, IA

May 13, 1991Clayton County, Iowa; Grant County, Wisconsin

NWS Quad Cities, IA issued this severe thunderstorm warning at May 13, 1991, 6:26 AM CDT for Clayton County, Iowa; Grant County, Wisconsin. It was in force for 34 min.

The area

The counties it named.

The facts

Issued
May 13, 1991, 6:26 AM CDT (11:26 UTC)
Expired
May 13, 1991, 7:00 AM CDT
In force
34 min
Issued by
NWS Quad Cities, IA
Area
Whole counties

Counties Clayton County, IA, Grant County, WI

The nearest sounding before it

Minneapolis, MN (KSTC), launched 00:00Z, 11.4 hours before the alert went out and 303 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, Minneapolis, MN at 00:00Z on 1991-05-13Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 926 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, Minneapolis, MN at 00:00Z on 1991-05-13The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 6 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
926 J/kg
Mixed-layer CIN
-54 J/kg
Mixed-layer LCL
1539 m above ground
0-6 km bulk shear
12 kt
0-1 km storm-relative helicity
6 m²/s²
0-3 km storm-relative helicity
29 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

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The text

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

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.