Alert archive / South Dakota / Severe Thunderstorm Warnings in 1987

Severe Thunderstorm Warning 131, NWS Sioux Falls, SD

August 15, 1987Minnehaha County, Moody County, South Dakota

NWS Sioux Falls, SD issued this severe thunderstorm warning at Aug 15, 1987, 9:22 PM CDT for Minnehaha County, Moody County, South Dakota. It was in force for 68 min.

The area

The counties it named.

The facts

Issued: Aug 15, 1987, 9:22 PM CDT (02:22 UTC)
Expired: Aug 15, 1987, 10:30 PM CDT
In force: 68 min
Issued by: NWS Sioux Falls, SD
Area: Whole counties

Counties Minnehaha County, SD, Moody 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

Minneapolis, MN (KSTC), launched 00:00Z, 2.4 hours before the alert went out and 273 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 1675 J/kg
Mixed-layer CIN: -115 J/kg
Mixed-layer LCL: 1435 m above ground
0-6 km bulk shear: 32 kt
0-1 km storm-relative helicity: 87 m²/s²
0-3 km storm-relative helicity: 87 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 3.1

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

Local storm report, Aug 15, 6:28 PM CDT, 2 hours 54 minutes before

STORM REPORT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
625 PM CDT SAT AUG 15 1987

STORM DATA FOR SATURDAY AFTERNOON AND EVENING

 TIME            COUNTY..LOCATION           CHARACTER OF STORM..DAMAGE
.......................................................................

 400 PM CDT     GREGORY...AT BURKE AND     3/4 INCH HAIL FELL
                HERRICK

 607 PM CDT     CHARLES MIX...AROUND       GOLF BALL TO HEN EGG SIZE
                WAGNER                     HAIL FELL
KAPELA

Special weather statement, Aug 15, 6:48 PM CDT, 2 hours 34 minutes before

SEVERE WEATHER STATEMENT AND RADAR SUMMARY
NATIONAL WEATHER SERVICE HURON SD
645 PM CDT SAT AUG 15 1987

...SEVERE THUNDERSTORM WARNING FOR CODINGTON AND NORTHERN HAMLIN UNTIL
715 PM CDT...

...TORNADO WATCH FOR EASTERN SOUTH DAKOTA UNTIL 900 PM CDT...

AT 625 PM CDT...A LINE OF INTENSE THUNDERSTORMS WITH VERY HEAVY
RAIN CONTINUED OVER NORTHEASTERN SOUTH DAKOTA.

THE INTENSE THUNDERSTORMS WERE LOCATED 20 MILES EITHER SIDE OF A LINE
FROM BANCROFT...20 MILES EAST OF HURON TO ROSHOLT...60 MILES NORTH OF
WATERTOWN.  THESE STORMS HAVE PRODUCED TORNADOES...LARGE HAIL...
VERY HEAVY RAIN AND DANGEROUS LIGHTNING.

THE THUNDERSTORMS WERE MOVING TO THE EAST AT 35 MILES AN HOUR.

...OTHERWISE AN ISOLATED INTENSE THUNDERSTORM WITH VERY HEAVY RAIN
WAS 10 MILES NORTH AVON...WHICH IS ABOUT 30 MILES WEST OF YANKTON.

THESE STORMS HAVE PRODUCE VERY HEAVY RAIN...LARGE HAIL...STRONG
WINDS AND DANGEROUS LIGHTNING.

THESE THUNDERSTORMS ARE MOV:ING TO THE EAST AT 35 MILES AN HOUR.

HUTCHEON

Local storm report, Aug 15, 7:18 PM CDT, 2 hours 4 minutes before

STORM REPORT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
715 PM CDT SAT AUG 15 1987

STORM DATA FOR SATURDAY EVENING

 TIME            COUNTY..LOCATION           CHARACTER OF STORM..DAMAGE
.......................................................................

 607 TO 630     CHARLES MIX...AT WAGNER    GOLF BALL TO BASEBALL SIZE
 PM CDT                                    HAIL...13/4 TO 3 INCH
                                           GROUND COVERED WHITE

 638 PM CDT     BON HOMME...HIGHWAY 46     3/4 INCH HAIL...40 MPH WINDS
                IN WESTERN PART OF CNTY    AND HEAVY RAINS

 708 PM CDT     BON HOMME...IN AVON        3/4 INCH HAIL...30 MPH WINDS
                     j                      AND HEAVY RAINS
KAPELA

Special weather statement, Aug 15, 8:04 PM CDT, 1 hour 18 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
805 PM CDT FRI AUG 14 1987

AT 800 PM CDTD THUNDERSTORMS COVERED THE AREA BETWEEN YANKTON AND
PICKSTOWN. SOME OF THESE STORMS WERE SEVERE AND WERE PRODUCING
LARGE HAIL...GUSTY WINDS TO AROUND 40 MPH...DEADLY LIGHTNING...AND
HEAVY RAINS WHICH WERE REUSLTING IN PONDING OF WATER IN LOW LYING
AREAS. THESE STORMS WERE MOVING EAST AT NO MORE THAN 20 MPH.

ELSEWHERE...A LINE OF INTENSE THUNDERSTORMS EXTENDED FROM 40 MILES
WEST OF SIOUX FALLS NEAR SALEM TO THE CLEAR LAKE AREA IN EASTCENTRAL
SOUTH DAKOTA. THESE INTENSE STORMS WERE PRODUCING PEA TO MARBLE SIZE
HAIL...WIND GUSTS TO 40 TO 50 MPH...AND HEAVY RAINS. THIS LINE WAS
MOVING EAST AT 30 MPH.
KAPELA

Local storm report, Aug 15, 8:28 PM CDT, 54 minutes before

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Special weather statement, Aug 15, 8:50 PM CDT, 32 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 15, 7:48 PM CDT	Severe Thunderstorm Warning	FSD	Bon Homme, Charles Mix	57 min
Aug 15, 8:12 PM CDT	Severe Thunderstorm Warning	FSD	Yankton	63 min
Aug 15, 9:05 PM CDT	Severe Thunderstorm Warning	FSD	McCook, Minnehaha	55 min
Aug 16, 12:19 AM CDT	Severe Thunderstorm Warning	FSD	Sioux	56 min
Aug 16, 12:59 AM CDT	Severe Thunderstorm Warning	FSD	Osceola	61 min
Aug 15, 9:22 PM CDT	Severe Thunderstorm Warning	FSD	Pipestone	68 min

Nearby

Severe Thunderstorm Warnings in South Dakota, 1987 Every 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.