Alert archive / South Dakota / Severe Thunderstorm Warnings in 1989

Severe Thunderstorm Warning 10, NWS Sioux Falls, SD

May 21, 1989Aurora County, Douglas County, South Dakota

NWS Sioux Falls, SD issued this severe thunderstorm warning at May 21, 1989, 7:19 PM CDT for Aurora County, Douglas County, South Dakota. It was in force for 26 min.

The area

The counties it named.

The facts

Issued
May 21, 1989, 7:19 PM CDT (00:19 UTC)
Expired
May 21, 1989, 7:45 PM CDT
In force
26 min
Issued by
NWS Sioux Falls, SD
Area
Whole counties

Counties Aurora County, SD, Douglas County, SD

The radar

The WSR-88D network and its archive begin in 1991, so there is no radar volume for this alert.

The nearest sounding before it

N. Platte/Lee Bi, NE (KLBF), launched 00:00Z, 0.3 hours before the alert went out and 322 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, N. Platte/Lee Bi, NE at 00:00Z on 1989-05-22Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1285 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, N. Platte/Lee Bi, NE at 00:00Z on 1989-05-22The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 18 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
1285 J/kg
Mixed-layer CIN
-104 J/kg
Mixed-layer LCL
1630 m above ground
0-6 km bulk shear
43 kt
0-1 km storm-relative helicity
18 m²/s²
0-3 km storm-relative helicity
107 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.6

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
May 21, 7:22 PM CDTSevere Thunderstorm WarningFSDGregory38 min
May 21, 7:35 PM CDTSevere Thunderstorm WarningFSDCharles Mix25 min
May 21, 7:59 PM CDTTornado WarningFSDDouglas31 min

Nearby

Severe Thunderstorm Warnings in South Dakota, 1989Every severe thunderstorm warning in 1989

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.