Alert archive / South Dakota / Severe Thunderstorm Warnings in 1987

Severe Thunderstorm Warning 83, NWS Aberdeen, SD

July 31, 1987Dewey County, South Dakota

NWS Aberdeen, SD issued this severe thunderstorm warning at Jul 31, 1987, 7:25 PM MDT for Dewey County, South Dakota. It was in force for 65 min.

The area

The counties it named.

The facts

Issued
Jul 31, 1987, 7:25 PM MDT (01:25 UTC)
Expired
Jul 31, 1987, 8:30 PM MDT
In force
65 min
Issued by
NWS Aberdeen, SD
Area
Whole counties

County Dewey 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

Bismarck Municip, ND (KBIS), launched 00:00Z, 1.4 hours before the alert went out and 180 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, Bismarck Municip, ND at 00:00Z on 1987-08-01Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 3020 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, Bismarck Municip, ND at 00:00Z on 1987-08-01The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 23 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
3020 J/kg
Mixed-layer CIN
-31 J/kg
Mixed-layer LCL
1599 m above ground
0-6 km bulk shear
27 kt
0-1 km storm-relative helicity
23 m²/s²
0-3 km storm-relative helicity
66 m²/s²
Significant tornado parameter
0.1
Supercell composite
1.2

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, Jul 31, 7:00 PM MDT, 25 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE ABERDEEN SD
700 PM MDT FRI JUL 31 1987

...INTENSE THUNDERSTORMS DEVELOPING RAPIDLY IN NORTH CENTRAL AND
   NORTHWEST SOUTH DAKOTA...

AT 655 PM MDT RADAR INDICATED A VERY INTENSE THUNDERSTORM ALONG THE
DEWEY AND ZIEBACH COUNTY LINE ON THE MOREAU RIVER OR 55 MILES SOUTH
WEST OF MOBRIDGE SOUTH DAKOTA MOVING NORTHEAST AT 25 MPH.

PERSONS WITHIN THE TIMBER LAKE...GLENCROSS...TRAIL CITY AND WHITEHORSE
COMMUNITIES OF DEWEY COUNTY IN NORTH CENTRAL SOUTH DAKOTA SHOULD BE
PREPARED FOR ADVERSE WEATHER FOR THE NEXT 2 HOURS.

STRONG WIND OF 45 TO 55 MPH IS POSSIBLE WITH THE PASSAGE OF THIS STORM
ALONG WITH VERY HEAVY RAIN AND SMALL HAIL.
 STUDNICKA

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 31, 9:54 PM MDTSevere Thunderstorm WarningABRDewey66 min
Jul 31, 11:26 PM MDTSevere Thunderstorm WarningABREdmunds64 min
Aug 1, 12:17 AM MDTTornado WarningABRBrown28 min
Aug 1, 12:37 AM MDTSevere Thunderstorm WarningABRBrown, Marshall53 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.