Alert archive / Minnesota / Severe Thunderstorm Warnings in 1986

Severe Thunderstorm Warning 98, NWS Twin Cities, MN

July 12, 1986Le Sueur County, Minnesota

NWS Twin Cities, MN issued this severe thunderstorm warning at Jul 12, 1986, 9:46 PM CDT for Le Sueur County, Minnesota. It was in force for 59 min.

The area

The counties it named.

The facts

Issued: Jul 12, 1986, 9:46 PM CDT (02:46 UTC)
Expired: Jul 12, 1986, 10:45 PM CDT
In force: 59 min
Issued by: NWS Twin Cities, MN
Area: Whole counties

County Le Sueur 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, 2.8 hours before the alert went out and 54 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: 457 J/kg
Mixed-layer CIN: -19 J/kg
Mixed-layer LCL: 1227 m above ground
0-6 km bulk shear: 16 kt
0-1 km storm-relative helicity: 52 m²/s²
0-3 km storm-relative helicity: 92 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.9

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KMSP 130246
SVRRST
MNC079-161-131-147-130345-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ROCHESTER MN
ISSUED BY MINNEAPOLIS MN
946 PM CDT SAT JUL 12 1986

THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM 
WARNING EFFECTIVE UNTIL 1045 PM CDT FOR PEOPLE IN THE FOLLOWING 
COUNTIES OF

SOUTH CENTRAL MINNESOTA...SOUTHERN LE SUEUR...WASECA...SOUTHWEST 
 RICE AND STEELE

AT 934 PM RADAR SHOWS A SEVERE THUNDERSTORM IN NORTHERN WASECA
COUNTY MOVING SOUTHEAST AT 40 TO 45 MPH.

REMEMBER SEVERE THUNDERSTORMS PRODUCE STRONG DAMAGING WINDS..LARGE
HAIL AND FREQUENT LIGHTNING STRIKES. ALSO SEVERE THUNDERSTORMS CAN
DO AND OCCASIONALLY DO PRODUCE A TORNADO WITH LITTLE OR NO ADVANCE
WARNING..SO BE ON THE LOOKOUT AND BE PREPARED TO MOVE TO A PLACE OF
SAFETY IF ONE IS SPOTTED.

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 12, 7:33 PM CDT	Severe Thunderstorm Warning	MPX	Carver, Hennepin, Scott	57 min
Jul 12, 8:00 PM CDT	Severe Thunderstorm Warning	MPX	Anoka, Dakota, Hennepin, Ramsey	45 min
Jul 12, 9:46 PM CDT	Severe Thunderstorm Warning	MPX	Rice, Steele, Waseca	59 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.