Alert archive / South Dakota / Severe Thunderstorm Warnings in 1991

Severe Thunderstorm Warning 57, NWS Sioux Falls, SD

June 20, 1991Lake County, South Dakota

NWS Sioux Falls, SD issued this severe thunderstorm warning at Jun 20, 1991, 9:42 PM CDT for Lake County, South Dakota. It was in force for 63 min.

The area

The counties it named.

The facts

Issued
Jun 20, 1991, 9:42 PM CDT (02:42 UTC)
Expired
Jun 20, 1991, 10:45 PM CDT
In force
63 min
Issued by
NWS Sioux Falls, SD
Area
Whole counties

County Lake County, SD

The nearest sounding before it

Aberdeen, SD (KHON), launched 00:00Z, 2.7 hours before the alert went out and 140 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, Aberdeen, SD at 00:00Z on 1991-06-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 3448 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, Aberdeen, SD at 00:00Z on 1991-06-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 59 square meters per square second.19395878Sfc1 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
3448 J/kg
Mixed-layer CIN
-22 J/kg
Mixed-layer LCL
1642 m above ground
0-6 km bulk shear
26 kt
0-1 km storm-relative helicity
59 m²/s²
0-3 km storm-relative helicity
123 m²/s²
Significant tornado parameter
0.6
Supercell composite
10.1

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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 South Dakota, 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.