Alert archive / South Dakota / Severe Thunderstorm Warnings in 1987

Severe Thunderstorm Warning 42, NWS Aberdeen, SD

July 10, 1987Stanley County, South Dakota

NWS Aberdeen, SD issued this severe thunderstorm warning at Jul 10, 1987, 5:05 PM MDT for Stanley County, South Dakota. It was in force for 55 min. 1 report came from inside the area while it was in force.

The area

The counties it named, with what was reported inside it.

The facts

Issued: Jul 10, 1987, 5:05 PM MDT (23:05 UTC)
Expired: Jul 10, 1987, 6:00 PM MDT
In force: 55 min
Issued by: NWS Aberdeen, SD
Area: Whole counties

County Stanley County, SD

The radar

The WSR-88D network and its archive begin in 1991, so there is no radar volume for this alert.

What was reported inside it

Time	Report	Where	Remark
Jul 10, 5:05 PM MDT	Hail 1.75	Stanley, SD

NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in. Storm Data before 1996 records only tornadoes, thunderstorm wind and hail.

The nearest sounding before it

Rapid City, SD (KRAP), launched 12:00Z, 11.1 hours before the alert went out and 175 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: 136 J/kg
Mixed-layer CIN: -314 J/kg
Mixed-layer LCL: 1547 m above ground
0-6 km bulk shear: 44 kt
0-1 km storm-relative helicity: 187 m²/s²
0-3 km storm-relative helicity: 275 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

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

Special weather statement, Jul 10, 3:22 PM MDT, 1 hour 43 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE ABERDEEN SD
420 PM CDT FRI JUL 10 1987

AT 410 PM CDT RADAR INDICATED INTENSE THUNDERSTORMS ALONG THE
MISSOURI RIVER 5 MILES WEST OF AKASKA OR 15 MILES SOUTHEAST OF
MOBRIDGE SOUTH DAKOTA AND 30 MILES EAST NORTHEAST OF MOBRIDGE.

THE THUNDERSTORMS WERE MOVING NORTHEAST AT 30 MPH. PERSONS IN WESTERN
MCPHERSON AND ALL OF WALWORTH COUNTY SHOULD BE ALERT FOR RAPIDLY
CHANGING WEATHER CONDITIONS AND PREPKARE TO TAKE SHELTER IF WEATHER
THREATENS.
GILLESPIE

Special weather statement, Jul 10, 4:12 PM MDT, 53 minutes before

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Local storm report, Jul 10, 4:31 PM MDT, 34 minutes before

STORM REPORT
NATIONAL WEATHER SERVICE ABERDEEN SD
530 PM CDT FRI JUL 10 1987

TIME           EVENT AND PLACE
447 PM CDT     LEOLA PEA TO MARBLE SIZE HAIL REPORTED BY POLICE.
               MCPHERSON COUNTY.

454 PM CDT     SELBY PEA TO MARBLE SIZE HAIL REPORTED BY POLICE.
               WALWORTH COUNTY.
GILLESPIE

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 9, 6:20 PM MDT	Tornado Warning	ABR	Brown	25 min
Jul 9, 7:13 PM MDT	Tornado Warning	ABR	Day	32 min
Jul 10, 3:26 PM MDT	Severe Thunderstorm Warning	ABR	Jones	64 min
Jul 10, 3:50 PM MDT	Severe Thunderstorm Warning	ABR	Stanley	55 min
Jul 10, 4:06 PM MDT	Tornado Warning	ABR	Stanley	39 min
Jul 10, 4:53 PM MDT	Tornado Warning	ABR	Sully	37 min
Jul 10, 5:13 PM MDT	Severe Thunderstorm Warning	ABR	Potter, Walworth	62 min
Jul 10, 5:55 PM MDT	Severe Thunderstorm Warning	ABR	Edmunds	65 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.