Alert archive / South Dakota / Severe Thunderstorm Warnings in 1986

Severe Thunderstorm Warning 188, NWS Sioux Falls, SD

September 20, 1986Gregory County, South Dakota

NWS Sioux Falls, SD issued this severe thunderstorm warning at Sep 20, 1986, 11:07 PM CDT for Gregory County, South Dakota. It was in force for 68 min.

The area

The counties it named.

The facts

Issued
Sep 20, 1986, 11:07 PM CDT (04:07 UTC)
Expired
Sep 21, 1986, 12:15 AM CDT
In force
68 min
Issued by
NWS Sioux Falls, SD
Area
Whole counties

County Gregory 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

Aberdeen, SD (KHON), launched 00:00Z, 4.1 hours before the alert went out and 200 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 1986-09-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 125 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 1986-09-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 153 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
125 J/kg
Mixed-layer CIN
-178 J/kg
Mixed-layer LCL
721 m above ground
0-6 km bulk shear
46 kt
0-1 km storm-relative helicity
153 m²/s²
0-3 km storm-relative helicity
183 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.3

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
Sep 20, 11:35 PM CDTSevere Thunderstorm WarningFSDAurora, Brule, Charles Mix35 min
Sep 20, 11:55 PM CDTSevere Thunderstorm WarningFSDAurora, Davison, Douglas65 min
Sep 21, 12:32 AM CDTSevere Thunderstorm WarningFSDDavison, Hanson, Hutchinson58 min
Sep 21, 1:19 AM CDTSevere Thunderstorm WarningFSDMcCook, Minnehaha56 min
Sep 21, 1:19 AM CDTSevere Thunderstorm WarningFSDLincoln56 min
Sep 21, 1:46 AM CDTSevere Thunderstorm WarningFSDLake, Moody59 min
Sep 21, 2:22 AM CDTSevere Thunderstorm WarningFSDMinnehaha, Moody53 min
Sep 20, 11:14 PM CDTSevere Thunderstorm WarningFSDMurray61 min
Sep 21, 12:34 AM CDTSevere Thunderstorm WarningFSDLyon56 min

Nearby

Severe Thunderstorm Warnings in South Dakota, 1986Every severe thunderstorm warning in 1986

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.