Alert archive / South Dakota / Severe Thunderstorm Warnings in 1987

Severe Thunderstorm Warning 52, NWS Aberdeen, SD

July 11, 1987Codington County, Deuel County, Hamlin County, South Dakota

NWS Aberdeen, SD issued this severe thunderstorm warning at Jul 11, 1987, 2:38 AM CDT for Codington County, Deuel County, Hamlin County, South Dakota. It was in force for 67 min.

The area

The counties it named.

The facts

Issued
Jul 11, 1987, 2:38 AM CDT (07:38 UTC)
Expired
Jul 11, 1987, 3:45 AM CDT
In force
67 min
Issued by
NWS Aberdeen, SD
Area
Whole counties

Counties Codington County, SD, Deuel County, SD, Hamlin 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, 7.6 hours before the alert went out and 110 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 1987-07-11Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 3304 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 1987-07-11The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 52 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
3304 J/kg
Mixed-layer CIN
-7 J/kg
Mixed-layer LCL
1012 m above ground
0-6 km bulk shear
44 kt
0-1 km storm-relative helicity
52 m²/s²
0-3 km storm-relative helicity
66 m²/s²
Significant tornado parameter
1.3
Supercell composite
6.8

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 10, 9:52 PM CDT, 4 hours 46 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE ABERDEEN SD
950 PM CDT FRI JUL 10 1987

...INTENSE THUNDERSTORMS MOVING THROUGH MARSHALL AND ROBERTS COUNTIES...

AT 945 PM CDT RADAR INDICATED INTENSE THUNDERSTORMS WITH VERY HEAVY RAIN
WERE MOVING THROUGH EASTERN MARSHALL AND ROBERTS COUNTIES OF NORTHEAST
SOUTH DAKOTA. THE STRONGEST STORMS WERE NEAR VEBLEN...70 MILES NORTHEAST
OF ABERDEEN...AND NEAR HAMMER...80 MILES NORTHEAST OF ABERDEEN.

THERE HAVE BEEN NO REPORTS OF SEVERE WEATHER WITH THESE STORMS...HOWEVER
IF YOU LIVE IN THE NORTHEAST SOUTH DAKOTA COUNTIES OF MARSHALL OR
ROBERTS YOU SHOULD BE ALERT TO RAPIDLY CHANGING WEATHER CONDITIONS AND
BE PREPARED TO SEEK SHELTER UNTIL AdBOUT 1100 PM CDT WHEN THESE STORMS
SHOULD MOVE OUT OF SOUTH DAKOTA.

KEEFE
Special weather statement, Jul 10, 10:48 PM CDT, 3 hours 50 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE ABERDEEN SD
1045 PM CDT FRI JUL 10 1987

...INTENSE THUNDERSTORM MOVING ACROSS SPINK COUNTY...

AT 1040 PM CDT RADAR INDICATED AN INTENSE THUNDERSTORM WITH VERY HEAVY
RAIN MOVING ACROSS SOUTHERN SPINK COUNTY NEAR REDFIELD...40 MILES
SOUTH OF ABERDEEN. THIS STORM WAS MOVING EAST AT 25 MPH.

IF YOU LIVE IN SOUTHERN SPINK COUNTY EXPECT SMALL HAIL...STRONG WIND...
DANGEROUS LIGHTNING...AND VERY HEAVY RAIN AS THIS STORM MOVES THROUGH
YOUR COUNTY.

YOU SHOULD REMAIN ALERT TO THE WEATHER CONDITIONS UNTIL ABOUT 1130 PM
CDT WHEN THIS STORM SHOULD LEAVE SPINK COUNTY.

KEEFE
Local storm report, Jul 11, 12:04 AM CDT, 2 hours 34 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
Jul 10, 7:16 PM CDTSevere Thunderstorm WarningABRFaulk, Potter59 min
Jul 10, 8:02 PM CDTSevere Thunderstorm WarningABRBrown, Edmunds, McPherson58 min
Jul 10, 8:36 PM CDTSevere Thunderstorm WarningABRBrown54 min
Jul 10, 10:22 PM CDTSevere Thunderstorm WarningABRMarshall, Roberts68 min
Jul 10, 11:30 PM CDTSevere Thunderstorm WarningABRRoberts35 min
Jul 11, 2:13 AM CDTSevere Thunderstorm WarningABRHamlin, Kingsbury62 min
Jul 11, 2:19 AM CDTSevere Thunderstorm WarningABRDeuel, Hamlin56 min
Jul 11, 2:38 AM CDTSevere Thunderstorm WarningABRKingsbury67 min
Jul 11, 5:07 PM CDTSevere Thunderstorm WarningABRStanley68 min
Jul 11, 5:25 PM CDTTornado WarningABRHughes, Stanley, Sully35 min
Jul 11, 6:26 PM CDTSevere Thunderstorm WarningABRHughes, Hyde64 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.