Alert archive / South Dakota / Severe Thunderstorm Warnings in 1987

Severe Thunderstorm Warning 121, NWS Aberdeen, SD

August 15, 1987Brown County, Spink County, South Dakota

NWS Aberdeen, SD issued this severe thunderstorm warning at Aug 15, 1987, 4:06 PM CDT for Brown County, Spink County, South Dakota. It was in force for 69 min.

The area

The counties it named.

The facts

Issued
Aug 15, 1987, 4:06 PM CDT (21:06 UTC)
Expired
Aug 15, 1987, 5:15 PM CDT
In force
69 min
Issued by
NWS Aberdeen, SD
Area
Whole counties

Counties Brown County, SD, Spink 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 12:00Z, 9.1 hours before the alert went out and 41 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 12:00Z on 1987-08-15Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1389 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 12:00Z on 1987-08-15The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 94 square meters per square second.193958Sfc1 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
1389 J/kg
Mixed-layer CIN
-261 J/kg
Mixed-layer LCL
1459 m above ground
0-6 km bulk shear
37 kt
0-1 km storm-relative helicity
94 m²/s²
0-3 km storm-relative helicity
100 m²/s²
Significant tornado parameter
0.0
Supercell composite
-0.0

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 15, 2:30 PM CDT, 1 hour 36 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE ABERDEEN SD
230 PM CDT SAT AUG 15 1987

AT 220 PM CDT RADAR INDICATED AN INTENSE THUNDERSTORM HAD DEVELOPED
RAPIDLY 15 MILES SOUTHWEST OF ABERDEEN IN NORTHEAST SOUTH DAKOTA.
MOVEMENT WAS NORTHEAST AT 25 MPH. THIS STORM WILL MOVE OVER ABERDEEN
BY 300 PM.

THIS STORM CONTAINS VERY HEAVY RAIN...SMALL HAIL AND STRONG GUSTY WINDS.

INDIVIDUALS IN BROWN COUNTY SHOULD REMAIN ALERT FOR THREATENING
WEATHER AND SEEK SHELTER IF NECESSARY.
HUSTON

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 15, 2:44 PM CDTSevere Thunderstorm WarningABRBrown61 min
Aug 15, 3:05 PM CDTTornado WarningABRBrown, Spink25 min
Aug 15, 3:34 PM CDTTornado WarningABRBrown, Spink26 min
Aug 15, 4:51 PM CDTSevere Thunderstorm WarningABRDay, Marshall69 min
Aug 15, 5:45 PM CDTSevere Thunderstorm WarningABRClark60 min
Aug 15, 6:18 PM CDTSevere Thunderstorm WarningABRCodington, Hamlin57 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.