Alert archive / Minnesota / Severe Thunderstorm Warnings in 1986

Severe Thunderstorm Warning 146, NWS Sioux Falls, SD

July 30, 1986Lincoln County, Lyon County, Minnesota

NWS Sioux Falls, SD issued this severe thunderstorm warning at Jul 30, 1986, 12:39 AM CDT for Lincoln County, Lyon County, Minnesota. It was in force for 66 min. 2 reports 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 30, 1986, 12:39 AM CDT (05:39 UTC)
Expired
Jul 30, 1986, 1:45 AM CDT
In force
66 min
Issued by
NWS Sioux Falls, SD
Area
Whole counties

Counties Lincoln County, MN, Lyon County, MN

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

TimeReportWhereRemark
Jul 30, 1:30 AM CDTThunderstorm Wind 0Lyon, MN
Jul 30, 1:53 AM CDTHail 2.5Lyon, MN

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

Aberdeen, SD (KHON), launched 00:00Z, 5.7 hours before the alert went out and 193 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 1986-07-30Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 3602 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 1986-07-30The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 103 square meters per square second.1939587897Sfc1 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
3602 J/kg
Mixed-layer CIN
-50 J/kg
Mixed-layer LCL
1336 m above ground
0-6 km bulk shear
45 kt
0-1 km storm-relative helicity
103 m²/s²
0-3 km storm-relative helicity
243 m²/s²
Significant tornado parameter
3.5
Supercell composite
24.1

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 29, 6:52 PM CDT, 5 hours 47 minutes before
SPECIAL WEATHER STATEMENT...CORRECTED...
NATIONAL WEATHER SERVICE SIOUX FALLS SD
647 PM CDT TUE JUL 29 1986

.SEVERE THUNDERSTORM WARNING FOR MCCOOK...HANSON COUNTIES TIL 715 PM CDT.
...SEVERE THUNDERSTORM WARNING EASTERN CHARLES-MIX...SOUTHEAST DOUGLAS
...HUTCHINSON...BON-HOMME...WESTERN YANKTON COUNTIES UNTIL 700 PM CDT...

AT 635 PM CDT RADAR SHOWED A LINE OF INTENSE THUNDERSTORMS FROM
40 MILES WESTNORTHWEST OF SIOUX FALLS NEAR SOUTH DAKOTA TO 25 MILES
WEST OF YANKTON NEAR SPRINGFIELD SOUTH DAKOTA MOVING EAST NORTHEAST AT
25 MPH.

THESE THUNDERSTORMS MAY PRODUCE LARGE HAIL...DAMAGING WINDS...
DANGEROUS CLOUD TO GROUND LIGHTNING AND VERY HEAVY RAIN.

PERSONS NEAR AND TO THE EASTNORTHEAST OF THESE THUNDERSTORMS SHOULD
BE PREPARED FOR THIS ADVERSE WEATHER AND MOVE TO A SAFE PLACE IF
NECESSARY.
BLOOM
Special weather statement, Jul 29, 7:24 PM CDT, 5 hours 15 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
725 PM CDT TUE JUL 29 1986

...TORNADO WATCH FOR MOST OF EASTERN SOUTH DAKOTA UNTIL 1 AM CDT...

THE SEVERE THUNDERSTORM WARNING FOR SEVERAL COUNTIES IN SOUTHEAST
SOUTH DAKOTA HAVE EXPIRED AND WILL NOT BE RENEWED.

AT 713 PM CDT RADAR SHOWED A SINGLE THUNDERSTORM 15 MILES NORTHWEST
OF SIOUX FALLS MOVING NORTHEAST AT 25 MPH AND WEAKENING RAPIDLY.
RADAR ALSO SHOWED A LINE OF THUNDERSTORMS 30 MILES WEST NORTHWEST
OF YANKTON NEAR TYNDALL SOUTH DAKOTA TO 30 MILES NORTHNORTHWEST OF
SIOUX CITY NEAR MERRILL IOWA MOVING EAST AT 25 MPH.

THESE THUNDERSTORMS MAY PRODUCE HAIL...STRONG WINDS...DANGEROUS
CLOUD TO GROUND LIGHTNING AND VERY HEAVY RAIN.

PERSONS NEAR THESE THUNDERSTORMS SHOULD BE PREPARED FOR THIS ADVERSE
WEATHER AND MOVE TO A SAFE PLACE IF NECESSARY.
BLOOM
Special weather statement, Jul 29, 7:40 PM CDT, 4 hours 59 minutes before
SPECIAL WEATHER STATEMENT AND RADAR SUMMARY
NATIONAL WEATHER SERVICE HURON SD
739 PM CDT TUE JUL 29 1986

...A TORNADO WATCH IS IN EFFECT FOR MUCH OF CENTRAL AND EASTERN
   SOUTH DAKOTA UNTIL 1 AM CDT...

AT 730 PM CDT...THUNDERSTORMS WITH VERY HEAVY RAIN WERE IN
EXTREME SOUTHEASTERN SOUTH DAKOTA.  THESE EXTENDED INTO
NORTHEASTERN NEBRASKA.

IN SOUTH DAKOTA..THE STRONGEST THUNDERSTORM WAS JUST NORTH
OF YANKTON.

HAIL..STRONG WINDS..FREQUENT LIGHTNING..AND VERY HEAVY RAINS
ARE LIKELY WITH THESE STORMS.

OTHERWISE...SCATTERED THUNDERSTORMS WERE IN NORTHWESTERN
SOUTH DAKOTA.  THESE WERE FROM 15 MILES WEST OF LEMMON..TO
30 MILES SOUTH OF LEMMON.

ALL MOVEMENT WAS EAST AT 35 MILES AN HOUR.

KRAUSE/SPRINGER
Special weather statement, Jul 29, 8:40 PM CDT, 3 hours 59 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
840 PM CDT JUL 29 1986

...TORNADO WATCH FOR A LARGE PART OF EASTERN SOUTH DAKOTA UNTIL 1 AM
   CDT...
...INTENSE THUNDERSTORMS NEAR BROOKINGS SOUTH DAKOTA...

AT 833 PM CDT RADAR SHOWED A LINE OF INTENSE THUNDERSTORMS FROM
10 MILES SOUTHSOUTHWEST OF BROOKINGS TO 20 MILES NORTHWEST OF
BROOKINGS MOVING EAST AT 30 MPH.

THESE THUNDERSTORMS MAY PRODUCE HAIL...STRONG WINDS...DANGEROUS
CLOUD TO GROUND LIGHTNING AND VERY HEAVY RAIN.

PERSONS NEAR AND TO THE EAST OF THESE THUNDERSTORMS SHOULD BE PREPARED
FOR THIS ADVERSE WEATHER AND MOVE TO A SAFE PLACE IF NECESSARY.
BLOOM
Special weather statement, Jul 29, 10:05 PM CDT, 2 hours 34 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SIOUX CITY IA
1005 PM CDT TUE JUL 29 1986

..TORNADO WATCH UNTIL 1 AM THIS MORNING FOR MOST OF SIOUXLAND ...

AT 1000 PM CDT RADAR INDICATED AN AREA OF STRONG THUNDERSTORMS FROM
5 MILES SOUTH OF YANKTON SOUTH DAKOTA..55 MILES NORTHWEST OF SIOUX CITY
TO 10 MILES SOUTHWEST OF BERESFORD SOUTH DAKOTA..40 MILES NORTHWEST
OF SIOUX CITY.
THIS AREA OF STRONG THUNDERSTORMS WILL LIKELY PRODUCE HEAVY RAIN STRONG
GUSTY WINDS AND HAIL AS IT MOVES THROUGH THE TOWNS OF BERESFORD AND
ALCESTER SOUTH DAKOTA BETWEEN 1030 AND 1100 PM.

THESES STORMS ARE MOVING EAST AT 25 MILES AN HOUR.

PERSONS IN THE PATH OF THESE STORMS SHOULD BE ON THE LOOKOUT FOR
THREATING WEATHER AND BE PREPARED TO TAKE COVER.

TANNER
Special weather statement, Jul 29, 10:19 PM CDT, 2 hours 20 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
1018 PM CDT TUE JUL 29 1986

...TORNADO WATCH FOR MUCH OF EASTERN SOUTH DAKOTA UNTIL 1 AM CDT...

.CANCEL SEVERE THUNDERSTORM WARNING FOR ALL OF YANKTON...NORTHWEST
CLAY AND EXTREME SOUTHERN TURNER COUNTIES IN SOUTHEAST SOUTH DAKOTA.

THE SEVERE THUNDERSTORM WARNING FOR SOUTH CENTRAL AND SOUTHEAST
BROOKINGS COUNTY IN SOUTH DAKOTA AND FOR SOUTHERN LINCOLN COUNTY IN
MINNESOTA HAS EXPIRED AND WILL NOT BE RENEWED. THE SEVERE THUNDERSTORM
WARNING FOR ALL OF YANKTON...NORTHWEST CLAY AND EXTREME SOUTHERN TURNER
COUNTIES IN SOUTHEST SOUTH DAKOTA HAS BEEN CANCELED. THE THUNDERSTORMS
IN THESE AREAS HAVE DECREASED SOME SINCE 930 PM THIS EVENING.

AT 1005 PM CDT RADAR INDICATED A LINE OF THUNDERSTORMS FROM 60 MILES
NORTHEAST OF SIOUX FALLS NEAR LAKE WILSON MINNESOTA TO 25 MILES
NORTHEAST OF BROOKINGS SOUTH DAKOTA NEAR ASTORIA SOUTH DAKOTA MOVING
EAST SOUTHEAST AT 35 MPH. RADAR ALSO SHOWED THUNDERSTORMS 40 MILES
SOUTHSOUTHWEST OF SIOUX FALLS NEAR CENTERVILLE AND WAKONDA SOUTH
DAKOTA MOVING EAST AT 30 MPH.

THESE THUNDERSTORMS MAY PRODUCE HAIL...STRONG WINDS...DANGEROUS
CLOUD TO GROUND LIGHTNING AND VERY HEAVY ?RAIN.

PERSONS NEAR THESE THUNDERSTORMS SHOULD BE PREPARED FOR THIS ADVERSE
WEATHER AND MOVE TO A SAFE PLACE IF NECESSARY.
BLOOM

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 29, 9:05 PM CDTSevere Thunderstorm WarningFSDBrookings55 min
Jul 29, 9:31 PM CDTSevere Thunderstorm WarningFSDClay, Turner, Yankton59 min
Jul 30, 1:28 AM CDTSevere Thunderstorm WarningFSDLincoln, Lyon62 min
Jul 30, 2:31 AM CDTSevere Thunderstorm WarningFSDCottonwood, Murray59 min

Nearby

Severe Thunderstorm Warnings in Minnesota, 1986Every severe thunderstorm warning in 1986

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.