Alert archive / South Dakota / Tornado Warnings in 1991

Tornado Warning 16, NWS Aberdeen, SD

July 21, 1991Clark County, South Dakota

NWS Aberdeen, SD issued this tornado warning at Jul 21, 1991, 6:53 PM CDT for Clark County, South Dakota. It was in force for 37 min.

The area

The counties it named.

The facts

Issued
Jul 21, 1991, 6:53 PM CDT (23:53 UTC)
Expired
Jul 21, 1991, 7:30 PM CDT
In force
37 min
Issued by
NWS Aberdeen, SD
Area
Whole counties

County Clark County, SD

The nearest sounding before it

Minneapolis, MN (KSTC), launched 12:00Z, 11.9 hours before the alert went out and 325 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 1991-07-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 580 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 12:00Z on 1991-07-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -37 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
580 J/kg
Mixed-layer CIN
-163 J/kg
Mixed-layer LCL
606 m above ground
0-6 km bulk shear
23 kt
0-1 km storm-relative helicity
-37 m²/s²
0-3 km storm-relative helicity
42 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.1

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 Aberdeen, SD issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jul 21, 3:33 PM CDTSevere Thunderstorm WarningABRBrown57 min
Jul 21, 4:14 PM CDTSevere Thunderstorm WarningABRMarshall61 min
Jul 21, 4:37 PM CDTSevere Thunderstorm WarningABRBrown38 min
Jul 21, 4:46 PM CDTSevere Thunderstorm WarningABRDay, Marshall59 min
Jul 21, 5:26 PM CDTSevere Thunderstorm WarningABRRoberts64 min
Jul 21, 5:35 PM CDTSevere Thunderstorm WarningABRBrown55 min
Jul 21, 5:44 PM CDTSevere Thunderstorm WarningABRDay, Marshall31 min
Jul 21, 5:58 PM CDTSevere Thunderstorm WarningABRCorson62 min
Jul 21, 6:05 PM CDTSevere Thunderstorm WarningABRDay55 min
Jul 21, 6:13 PM CDTSevere Thunderstorm WarningABRSpink48 min
Jul 21, 6:29 PM CDTSevere Thunderstorm WarningABRRoberts61 min

Nearby

Tornado Warnings in South Dakota, 1991Every tornado warning in 1991Tornadoes 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.