Alert archive / South Dakota / Tornado Warnings in 1992

Tornado Warning 25, NWS Sioux Falls, SD

July 7, 1992Clay County, South Dakota

NWS Sioux Falls, SD issued this tornado warning at Jul 7, 1992, 9:52 PM CDT for Clay County, South Dakota. It was in force for 25 min.

The area

The counties it named.

The facts

Issued
Jul 7, 1992, 9:52 PM CDT (02:52 UTC)
Expired
Jul 7, 1992, 10:17 PM CDT
In force
25 min
Issued by
NWS Sioux Falls, SD
Area
Whole counties

County Clay County, SD

The nearest sounding before it

Omaha, NE (KOVN), launched 00:00Z, 2.9 hours before the alert went out and 184 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, Omaha, NE at 00:00Z on 1992-07-08Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2090 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, Omaha, NE at 00:00Z on 1992-07-08The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 26 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
2090 J/kg
Mixed-layer CIN
-127 J/kg
Mixed-layer LCL
1219 m above ground
0-6 km bulk shear
57 kt
0-1 km storm-relative helicity
26 m²/s²
0-3 km storm-relative helicity
97 m²/s²
Significant tornado parameter
0.2
Supercell composite
1.4

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
TTAA00 KFSD 080253
TORFSD
SDC027-080330-
 
BULLETIN - EBS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE SIOUX FALLS SD
952 PM CDT TUE JUL 7 1992
 
THE NATIONAL WEATHER SERVICE IN SIOUX FALLS HAS ISSUED A
TORNADO WARNING EFFECTIVE UNTIL 1030 PM CDT
FOR PEOPLE IN THE FOLLOWING COUNTIES...
 
IN SOUTHEAST SOUTH DAKOTA
 
   ...CLAY COUNTY
 
THIS WARNING INCLUDES THE CITIES OF VERMILLION AND BURBANK.
 
AT 945 PM CDT RADAR INDICATED A POSSIBLE TORNADO JUST NORTH OF
VERMILLION MOVING EAST TO SOUTHEAST AT 30 MPH. PERSONS IN VERMILLION
SHOULD TAKE COV4ER IMMEDIATELY.
 
THIS WARNING INCLUDES THE ADJACENT WATERS OF THE MISSOURI RIVER.
 
IF YOU LIVE IN A HOME OR APARTMENT...SEEK SHELTER IN THE
INNERMOST P*ORTION OF THE BUILDING ON THE LOWEST FLOOR.  IF YOU LIVE
IN A MOBILE HOME...ABANDON IT FOR A STRONGER SHELTER.
BIER

The office that day

Everything else NWS Sioux Falls, SD issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jul 7, 9:09 PM CDTSevere Thunderstorm WarningFSDClay51 min
Jul 7, 9:31 PM CDTSevere Thunderstorm WarningFSDUnion44 min
Jul 7, 10:02 PM CDTSevere Thunderstorm WarningFSDUnion28 min
Jul 7, 10:41 PM CDTSevere Thunderstorm WarningFSDBon Homme49 min
Jul 8, 12:06 AM CDTSevere Thunderstorm WarningFSDUnion54 min

Nearby

Tornado Warnings in South Dakota, 1992Every tornado warning in 1992Tornadoes in 1992

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.