Alert archive / Minnesota / Severe Thunderstorm Warnings in 1986

Severe Thunderstorm Warning 44, NWS Twin Cities, MN

June 15, 1986Le Sueur County, Nicollet County, Minnesota

NWS Twin Cities, MN issued this severe thunderstorm warning at Jun 15, 1986, 8:39 PM CDT for Le Sueur County, Nicollet County, Minnesota. It was in force for 66 min.

The area

The counties it named.

The facts

Issued: Jun 15, 1986, 8:39 PM CDT (01:39 UTC)
Expired: Jun 15, 1986, 9:45 PM CDT
In force: 66 min
Issued by: NWS Twin Cities, MN
Area: Whole counties

Counties Le Sueur County, MN, Nicollet 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 00:00Z, 1.7 hours before the alert went out and 63 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: 804 J/kg
Mixed-layer CIN: -28 J/kg
Mixed-layer LCL: 1903 m above ground
0-6 km bulk shear: 42 kt
0-1 km storm-relative helicity: -509 m²/s²
0-3 km storm-relative helicity: -555 m²/s²
Significant tornado parameter: -0.2
Supercell composite: -12.4

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KRST 160139
SVRRST
MNC103-079-160245-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ROCHESTER MN
839 PM CDT SUN JUN 15 1986

THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM 
WARNING EFFECTIVE UNTIL 945 PM CDT FOR PEOPLE IN THE FOLLOWING 
COUNTIES OF

SOUTH CENTRAL MINNESOTA...EASTERN NICOLLET AND LESUEUR

AT 825 PM CDT RADAR INDICATED A SEVERE THUNDERSTORM 15 MILES
NORTH OF MANKATO MOVINGF TO THE EAST SOUTHEAST AT 25 MPH.

AT 825 MPH CDT MARBLE SIZE HAIL WAS REPORTED IN THE CENTRAL
PART OF NICOLLETE COUNTY NEAR SWAN LAKE.

 A SEVERE THUNDERSTORM PRODUCES STRONG DAMAGING WINDS..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.

 A TORNADO WATCH IS IN EFFECT UNTIL MIDNIGHT TONIGHT FOR PORTIONS
 OF SOUTHCENTRAL MINNESOTA.

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

Local storm report, Jun 15, 8:25 PM CDT, 14 minutes before

LOCAL STORM REPORT

NATIONAL WEATHER SERVICE MINNEAPOLIS/ST PAUL MN
830 PM CDT  SUN JUNE 15 1986

      ...ATTN SELS A MSP...

ALL TIME IN CENTRAL DAYLIGHT TIME

655 PM  MARBLE HAIL EXTREME NORTHWEST MCLEOD COUNTY.

715 PM  GOLF BALL SIZE HAIL BETWEEN HECTOR AND BUFFALO LAKE IN
        EASTERN RENVILLE COUNTY.

RICHARDSON

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 15, 7:01 PM CDT	Severe Thunderstorm Warning	MPX	McLeod, Renville, Sibley	59 min
Jun 15, 7:39 PM CDT	Severe Thunderstorm Warning	MPX	Carver, Hennepin, McLeod, Wright	51 min
Jun 15, 8:54 PM CDT	Tornado Warning	MPX	Blue Earth, Le Sueur	21 min
Jun 15, 9:13 PM CDT	Severe Thunderstorm Warning	MPX	Waseca	92 min
Jun 15, 9:55 PM CDT	Tornado Warning	MPX	Freeborn	20 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.