Alert archive / Minnesota / Severe Thunderstorm Warnings in 1986

Severe Thunderstorm Warning 65, NWS Twin Cities, MN

June 21, 1986Benton County, Stearns County, Minnesota

NWS Twin Cities, MN issued this severe thunderstorm warning at Jun 21, 1986, 5:45 PM CDT for Benton County, Stearns County, Minnesota. It was in force for 55 min.

The area

The counties it named.

The facts

Issued
Jun 21, 1986, 5:45 PM CDT (22:45 UTC)
Expired
Jun 21, 1986, 6:40 PM CDT
In force
55 min
Issued by
NWS Twin Cities, MN
Area
Whole counties

Counties Benton County, MN, Stearns 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, 10.8 hours before the alert went out and 102 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 1986-06-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 318 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Minneapolis, MN at 12:00Z on 1986-06-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 89 square meters per square second.19395878Sfc1 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
318 J/kg
Mixed-layer CIN
-59 J/kg
Mixed-layer LCL
727 m above ground
0-6 km bulk shear
44 kt
0-1 km storm-relative helicity
89 m²/s²
0-3 km storm-relative helicity
106 m²/s²
Significant tornado parameter
0.1
Supercell composite
1.8

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KSTC 212245
SVRSTC
MNC145-009-212345-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ST CLOUD MN
545 PM CDT SAT JUN 21 1986

THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM WARNING
EFFECTIVE UNTIL 640PM  CDT FOR PEOPLE IN THE FOLLOWING COUNTIES OF

CENTRAL MINNESOTA...EAST STEARNS AND BENTON COUNTY INCLUDING THE
CITIES OF ST CLOUD AND FOLEY.

AT 620 PM CDT RADAR INDICATED A LINE OF SEVERE  THUNDERSTORMS IN
CENTRAL MINNESOTA MOVING TO THE EAST AT 40 MPH.

PERSONS IN LOW LYING AREAS SHOULD BE AWARE OF RAPIDLY RISING STREAMS
DUE TO VERY HEAVY RAINS IN THESE AREAS

REMEMBER THESE STORMS CAN AND OCCASIONALLY PRODUCE A TORNADO WITH
LITTLE OR NO ADVANCE WARNING SO BE ON THE LOOK OUT.

IF THREATENING WEATHER APPROACHES..YOU SHOULD GO TO A SAFE PLACE
IMMEDIATELY..AND YOU SHOULD ASK THE NEAREST LAW ENFORCEMENT AGENCY TO
RELAY YOUR SEVERE WEATHER REPORTS TO THE LOCAL NATIONAL WEATHER
SERVICE OFFIC'E.

FRASER/TRIPLETT

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, Jun 21, 12:21 PM CDT, 5 hours 24 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MINNEAPOLIS/ST PAUL MN
1220 PM CDT SAT JUN 21 1986

...STRONG THREAT FOR SEVERE WEATHER OVER MINNESOTA THIS AFTERNOON
   AND EVENING...
Special weather statement, Jun 21, 3:36 PM CDT, 2 hours 9 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MINNEAPOLIS/ST PAUL MN
330 PM CDT SAT JUN 21 1986

...DANGEROUS SEVERE WEATHER SITUTION DEVELOPING OVER MINNESOTA...

A POTENTIALLY DANGEROUS SEVERE WEATHER SITUATION IS SETTING UP OVER
WESTERN MINNESOTA THIS SATURDAY AFTERNOON..AND IT APPEARS THAT MOST
OF MINNESOTA WILL EXPERIENCE A SEVERE WEATHER THREAT BY THE END OF
THIS SATURDAY EVENING.

AN EXPLOSIVELY UNSTABLE AIRMASS OVER MINNESOTA IN COMBINATION WITH
A STRONG UPPER ATMOSPHERIC DISTURBANCE FAVORS WIDESPREAD VIOLENT
THUNDERSTORMS WITH LARGE HAIL AND DESTRUCTIVE SURFACE WINDS. ALL
INGREDIENTS FOR THESE STORMS ARE IN PLACE.

SOME THUNDERSTORMS OVER WESTCENTRAL MINNESOTA HAVE ALREADY GROWN
TO 65000 FEET WHICH IS EXCEPTIONALLY HIGH FOR THIS PART OF THE
COUNTRY. THIS UNDERSCORES THE STRONG NATURE OF THIS PARTICULAR
SEVERE WEATHER SITUATION.

THE SEVERE WEATHER WILL PROBABLY BE MOVING INTO EASTERN SECTIONS OF
MINONESOTA SOMETIME THIS EVENING.

KEEP UP WITH THIS SEVERE WEATHER SITUATION BY PERIODICALLY CHECKING
SKY CONDITIONS IN YOUR AREA.

TOGSTAD

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 21, 4:25 PM CDTSevere Thunderstorm WarningMPXPope, Stearns55 min
Jun 21, 4:25 PM CDTSevere Thunderstorm WarningMPXSwift55 min
Jun 21, 4:30 PM CDTSevere Thunderstorm WarningMPXMorrison, Todd60 min
Jun 21, 5:25 PM CDTSevere Thunderstorm WarningMPXKandiyohi, Swift65 min
Jun 21, 6:25 PM CDTSevere Thunderstorm WarningMPXMeeker60 min
Jun 21, 6:25 PM CDTSevere Thunderstorm WarningMPXSherburne60 min
Jun 21, 6:45 PM CDTSevere Thunderstorm WarningMPXKandiyohi, Meeker60 min
Jun 21, 6:45 PM CDTSevere Thunderstorm WarningMPXChippewa60 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.