Alert archive / South Dakota / Severe Thunderstorm Warnings in 1987

Severe Thunderstorm Warning 116, NWS Sioux Falls, SD

August 5, 1987Aurora County, Brule County, Charles Mix County, South Dakota

NWS Sioux Falls, SD issued this severe thunderstorm warning at Aug 5, 1987, 8:27 PM CDT for Aurora County, Brule County, Charles Mix County, South Dakota. It was in force for 63 min.

The area

The counties it named.

The facts

Issued
Aug 5, 1987, 8:27 PM CDT (01:27 UTC)
Expired
Aug 5, 1987, 9:30 PM CDT
In force
63 min
Issued by
NWS Sioux Falls, SD
Area
Whole counties

Counties Aurora County, SD, Brule County, SD, Charles Mix 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, 1.5 hours before the alert went out and 153 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 1987-08-06Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1188 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 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 1987-08-06The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 43 square meters per square second.193958Sfc1 km3 km6 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
1188 J/kg
Mixed-layer CIN
-87 J/kg
Mixed-layer LCL
1877 m above ground
0-6 km bulk shear
22 kt
0-1 km storm-relative helicity
43 m²/s²
0-3 km storm-relative helicity
229 m²/s²
Significant tornado parameter
0.1
Supercell composite
1.9

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.

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

In the hours before

Special weather statement, Aug 5, 4:10 PM CDT, 4 hours 17 minutes before
SPECIAL WEATHER STATEMENT AND RADAR SUMMARY
NATIONAL WEATHER SERVICE HURON SD
405 PM CDT WED AUG 5 1987

...THUNDERSTORMS HAVE BEGUN DEVELOPING OVER CENTRAL SOUTH DAKOTA...

AT 4 PM CDT...INTENSE THUYNDERSTORMS HAD DEVELOPED OVER CENTRAL SOUTH
DAKOTA 25 AND 35 MILES NORTHWEST OF PIERRE.

VERY HEAVY RAIN...STRONG WIND...AND HAIL IS LIKELY WITH THESE STORMS.

MOVEMENT WAS EAST AT 25 MILES AN HOUR.

SPRINGER

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 5, 7:01 PM CDTTornado WarningFSDBrule29 min
Aug 5, 7:30 PM CDTTornado WarningFSDBrule60 min
Aug 5, 8:12 PM CDTSevere Thunderstorm WarningFSDGregory, Tripp63 min
Aug 5, 9:15 PM CDTSevere Thunderstorm WarningFSDCharles Mix, Gregory, Tripp60 min
Aug 5, 10:09 PM CDTSevere Thunderstorm WarningFSDHutchinson, Turner66 min
Aug 5, 10:27 PM CDTSevere Thunderstorm WarningFSDBon Homme, Charles Mix63 min
Aug 5, 10:27 PM CDTSevere Thunderstorm WarningFSDDouglas63 min
Aug 5, 11:26 PM CDTSevere Thunderstorm WarningFSDYankton34 min
Aug 5, 11:57 PM CDTSevere Thunderstorm WarningFSDClay33 min

Nearby

Severe Thunderstorm Warnings in South Dakota, 1987Every severe thunderstorm warning in 1987

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.