Alert archive / Minnesota / Severe Thunderstorm Warnings in 1986

Severe Thunderstorm Warning 38, NWS Sioux Falls, SD

May 12, 1986Jackson County, Minnesota

NWS Sioux Falls, SD issued this severe thunderstorm warning at May 12, 1986, 5:18 PM CDT for Jackson County, Minnesota. It was in force for 57 min.

The area

The counties it named.

The facts

Issued: May 12, 1986, 5:18 PM CDT (22:18 UTC)
Expired: May 12, 1986, 6:15 PM CDT
In force: 57 min
Issued by: NWS Sioux Falls, SD
Area: Whole counties

County Jackson County, MN

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 12:00Z, 10.3 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-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: 62 J/kg
Mixed-layer CIN: -206 J/kg
Mixed-layer LCL: 776 m above ground
0-6 km bulk shear: 20 kt
0-1 km storm-relative helicity: 134 m²/s²
0-3 km storm-relative helicity: 93 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
TTAA00 KFSD 122218
SVRFSD
MNC063-122315-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE SIOUX FALLS SD
518 PM CDT MON MAY 12 1986

THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM 
WARNING EFFECTIVE UNTIL 615 PM CDT FOR PEOPLE IN THE FOLLOWING 
COUNTY OF

SOUTHWEST MINNESOTA...SOUTHERN JACKSON

SOME OF THE CITIES INCLUDED IN SOUTHWEST MINNESOTA ARE LAKEFIELD
AND JACKSON.

AT 515 PM CDT  RADAR INDICATED A LINE OF SEVERE THUNDERSTORMS
FROM 15 EAST OF WORTHINGTON MINNESOTA TO 25 MILES SOUTHSOUTHEAST
OF WORTHINGTON MOVING EAST AT 15 MPH.

 AT 500 PM CDT GOLF BALL SIZE HAIL WAS REPORTED AT HARRIS IOWA.

IF YOU ARE IN THE PATH OF THIS STORM..YOU SHOULD GET TO A REINFORCED
SHELTER. A SEVERE THUNDERSTORM PRODUCES DAMAGING WINDS IN EXCESS OF
60 MPH..HAIL 3/4 INCH OR LARGER..DEADLY LIGHTNING..AND HEAVY RAIN
THAT CAN QUICKLY FLOOD A LOW LYING AREA.

THESE STORMS CAN AND OCCASIONALLY DO PRODUCE A TORNADO WITH LITTLE OR
NO ADVANCE WARNING SO BE ON THE LOOKOUT.

BEHREND

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, May 12, 1:48 PM CDT, 3 hours 30 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
145 PM CDT MON MAY 12 1986

BETWEEN 100 PM AND 145 PM CDT AN INTENSE THUNDERSTORM QUICKLY POPPED UP
JUST SOUTHEAST OF PIPESTONE IN SOUTHWESTERN MINNESOTA. THIS THUNDERSTORM
WAS LIKELY PRODUCING BRIEF HEAVY RAINS...SMALL HAIL..AND GUSTY WINDS
TO PERHAPS 40 MPH.

THIS INTENSE THUNDERSTORM WAS MOVING NORTHEAST AT 30 MPH AND BY 230
PM CDT WILL HAVE REACHED THE AREA BETWEEN SLAYTON AND TRACY MINNESOTA.

OTHER THUNDERSHOWERS WERE GATHERING STRENGTH FROM EAT OF BROOKINGS
SOUTH DAKOTA OVER TO THE LAKE BENTON AREA IN THE SOUTHWESTERN
MINNESOTA COUNTY OF LINCOLN.

QUICK DEVELOPING THUNDERSTORMS WILL BE POSSIBLE OVER SOUTHWESTERN
MINNESOTA FOR THE REMAINDER OF THIS AFTERNOON AND EVENING AS A COLD
FRONT MOVES SLOWLY THROUGH THAT AREA.
KAPELA

Local storm report, May 12, 3:54 PM CDT, 1 hour 24 minutes before

STORM REPORT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
353 PM CDT MON MAY 12 1986

345 PM CDT        GOLF BALL SIZE HAIL AT READING MN/ 8 MILES NORTHWEST
                  OF WORTHINGTON MN/

BEHREND

Special weather statement, May 12, 4:48 PM CDT, 30 minutes before

SPECIAL WEATHER STATEMENT FOR FROST AND FREEZE WARNINGS
NATIONAL WEATHER SERVICE SIOUX FALLS SD
450 PM CDT MON MAY 12 1986

...FREEZE WARNING WEST TONIGHT...
...FROST WARNING NORTH CENTRAL TONIGHT...

THE NATIONAL WEATHER SERVICE HAS ISSUED A FREEZE WARNING FOR WESTERN
SOUTH DAKOTA AND A FROST WARNING FOR THE NORTH CENTRAL TONIGHT. LOW
TEMPERATURES TONIGHT ARE EXPECTED TO RANGE FROM THE UPPER 20S TO THE
THE MIDDLE 30S IN THE WEST AND NORTH CENTRAL. IN THE SPOTTY AREAS OF THE
WEST THAT DO NOT FREEZE TONIGHT..AND IN THE NORTH CENTRAL..FROST IS
LIKELY DUE TO NEAR FREEZING TEMPERATURES..CLEAR TO PARTLY CLOUDY SKIES
AND LIGHT WINDS.

PERSONS WITH GARDENS OR OTHER AGRICULTURAL INTERESTS LIVING IN WESTERN
OR NORTH CENTRAL SOUTH DAKOTA ARE ENCOURAGED TO COVER THEIR PLANTS
TONIGHT.
BIER

The office that day

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

Issued	Product	Office	Counties	Lasted
May 12, 1:56 PM CDT	Severe Thunderstorm Warning	FSD	Murray, Pipestone	39 min
May 12, 2:56 PM CDT	Severe Thunderstorm Warning	FSD	Nobles	34 min
May 12, 3:29 PM CDT	Severe Thunderstorm Warning	FSD	Nobles	61 min
May 12, 4:18 PM CDT	Severe Thunderstorm Warning	FSD	Jackson	57 min

Nearby

Severe Thunderstorm Warnings in Minnesota, 1986 Every 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; the sounding from the Mesonet's radiosonde archive.