Alert archive / South Dakota / Severe Thunderstorm Warnings in 1991

Severe Thunderstorm Warning 61, NWS Sioux Falls, SD

June 30, 1991Brookings County, South Dakota

NWS Sioux Falls, SD issued this severe thunderstorm warning at Jun 30, 1991, 6:58 PM CDT for Brookings County, South Dakota. It was in force for 47 min.

The area

The counties it named.

The facts

Issued
Jun 30, 1991, 6:58 PM CDT (23:58 UTC)
Expired
Jun 30, 1991, 7:45 PM CDT
In force
47 min
Issued by
NWS Sioux Falls, SD
Area
Whole counties

County Brookings County, SD

The nearest sounding before it

Minneapolis, MN (KSTC), launched 12:00Z, 12.0 hours before the alert went out and 258 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 12:00Z on 1991-06-30Temperature 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 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 12:00Z on 1991-06-30The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 185 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1153 m above ground
0-6 km bulk shear
32 kt
0-1 km storm-relative helicity
185 m²/s²
0-3 km storm-relative helicity
174 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.2

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 Sioux Falls, SD issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jun 30, 4:15 PM CDTSevere Thunderstorm WarningFSDCharles Mix, Gregory35 min
Jun 30, 4:51 PM CDTSevere Thunderstorm WarningFSDCharles Mix, Gregory24 min
Jun 30, 6:00 PM CDTSevere Thunderstorm WarningFSDBrookings, Lake45 min

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.