Alert archive / Minnesota / Severe Thunderstorm Warnings in 1986

Severe Thunderstorm Warning 139, NWS Twin Cities, MN

July 27, 1986Fillmore County, Mower County, Minnesota

NWS Twin Cities, MN issued this severe thunderstorm warning at Jul 27, 1986, 6:56 PM CDT for Fillmore County, Mower County, Minnesota. It was in force for 34 min.

The area

The counties it named.

The facts

Issued
Jul 27, 1986, 6:56 PM CDT (23:56 UTC)
Expired
Jul 27, 1986, 7:30 PM CDT
In force
34 min
Issued by
NWS Twin Cities, MN
Area
Whole counties

Counties Fillmore County, MN, Mower 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, 11.9 hours before the alert went out and 161 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, Minneapolis, MN at 12:00Z on 1986-07-27Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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, Minneapolis, MN at 12:00Z on 1986-07-27The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 230 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1192 m above ground
0-6 km bulk shear
45 kt
0-1 km storm-relative helicity
230 m²/s²
0-3 km storm-relative helicity
249 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 KRST 272356
SVRRST
MNC099-045-280030-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ROCHESTER MN
656 PM CDT SUN JUL 27 1986

THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM 
WARNING EFFECTIVE UNTIL 730 PM CDT FOR PEOPLE IN THE FOLLOWING 
COUNTIES OF

SOUTHEAST MINNESOTA...EASTERN MOWER AND WESTERN FILLMORE

THIS WARNING INCLUDES THE TOWNS OF GRAND MEADOW..LEROY..
SPRING VALLEY AND PRESTON. AT 640 PM RADAR INDICATED A SEVERE
THUNDERSTORM NEAR GRAND MEADOW AND WYKOFF MINNESOTA. AT 640 PM

VERY HEAVY DOWNPOURS OF RAIN AND HAIL WAS REPORTED NEAR WYKOFF
AND IN EASTERN MOWER COUNTY.

 A SEVERE THUNDERSTORM PRODUCES STRONG DAMAGING WINDS.X.LARGE HAIL
 ..VERY HEAVY RAIN AND DANGEROUS LIGHTNING.

 REMEMBER THESE STORMS CAN AND OCCASIONALLY DO PRODUCE A TORNADO
 WITH LITTLE OR NOW ADVANCE WARNING SO BE ON THE LOOKOUT.

 AMANN

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 27, 4:59 PM CDT, 1 hour 57 minutes before
SPECIAL WEATHER STATEMENT AND RADAR SUMMARY
NATIONAL WEATHER SERVICE MINNEAPOLIS/ST PAUL MN
455 PM CDT SUN JUL 27 1986

VERY STRONG THUNDERSTORMS WERE POUNDING THROUGH SOUTHEAST MINNESOTA
WEST AND WEST CENTRAL WISCONSIN..SINCE 400 PM.

AT 440 PM CDT..THESE INTENSE THUNDERSTORMS WERE LOCATED IN TWO SEPERATE
LINES..EACH..ABOUT 25 MILES WIDE.

ONE LINE EXTENDED FROM MENOMONEE SOUTHEAST THROUGH ELLSWORTH WISONSIN TO
THE MISSISSIPPI RIVER JUST NORTH OF..RED WING MINNESOTA.

THE OTHER LINE STRECHED FROM JUST NORTH OF WABASHA SOUTHEAST TO JUST
NOARTH OF ROCHESTER NEAR DODGE CENTER.

OTHER SCATTERED THUNDERSTORMS WERE DETECTED BETWEEN ROCHESTER AND AUSTIN
DOWN INTO NORTH CENTRAL IOWA.

MOVEMENT WAS TO THE EAST NORTHEAST AT 20 MILES AN HOUR.
CARLYON
Special weather statement, Jul 27, 5:52 PM CDT, 1 hour 4 minutes before
SPECIAL WEATHER STATEMENT AND RADAR SUMMARY
NATIONAL WEATHER SERVICE MINNEAPOLIS/ST PAUL MN
555 PM CDT SUN JUL 27 1986

VERY STRONG THUNDERSTORMS CONTIONUED POUNDING SOUTHEAST MINNESOTA..WEST
AND WEST CENTRAL WISCONSIN..LATE THIS AFTERNOON.

AT 530 PM CDT..THESE INTENSE THUNDERSTORMS WERE CONFINED TO ONE LARGE
AREA EXTENDING FROM..MOWER AND FILLMORE COUNTIES 10 MILES SOUTH OF
ROCHESTER NEAR..STEUARTVILLE NORTHEAST THROUGH WABASHA AND WINNONA
INTO WISCONSIN THROUGH ALMA..WHITEHALL..AND PEPIN UP TO THE CHIPPEWA
FALLS EAU CLAIRE AREAS.

BY FAR THE MOST INTENSE..IMPRESSIVE AND DANGERSOUS THUNDERSTORM WAS JUST
SOUTH OF THE ROCHESTER AIRPORT IN THE STEUARTVILLE AREA MOVING SLOWLY
EAST AT 10 MPH..THIS PARTICULAR STORM IS VERY VERY DANGEROUS AND ANYONE
NEAR THE STEUARTVILLE AREA OF SOUTHEAST MINNESOTA IS URGED TO SEEK
PROTECTIVE SHELTER.

MOVEMENT OF OTHER SHOWERS WAS TO THE NORTHEAST AT 20 MILES AN HOUR.
CARLYON

The office that day

Everything else NWS Twin Cities, MN issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jul 26, 7:13 PM CDTSevere Thunderstorm WarningMPXRenville47 min
Jul 26, 7:47 PM CDTTornado WarningMPXRenville43 min
Jul 26, 8:36 PM CDTTornado WarningMPXRedwood, Renville24 min
Jul 26, 9:10 PM CDTSevere Thunderstorm WarningMPXRedwood, Renville50 min
Jul 26, 9:35 PM CDTSevere Thunderstorm WarningMPXYellow Medicine55 min
Jul 26, 10:06 PM CDTSevere Thunderstorm WarningMPXRedwood, Renville54 min
Jul 26, 10:30 PM CDTSevere Thunderstorm WarningMPXYellow Medicine60 min
Jul 26, 11:15 PM CDTSevere Thunderstorm WarningMPXPope60 min
Jul 26, 11:23 PM CDTSevere Thunderstorm WarningMPXRedwood, Renville59 min
Jul 27, 3:47 PM CDTSevere Thunderstorm WarningMPXDakota38 min
Jul 27, 5:26 PM CDTSevere Thunderstorm WarningMPXFillmore, Olmsted49 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; the sounding from the Mesonet's radiosonde archive.