Alert archive / Minnesota / Severe Thunderstorm Warnings in 1986

Severe Thunderstorm Warning 97, NWS Twin Cities, MN

July 12, 1986Rice County, Steele County, Waseca County, Minnesota

NWS Twin Cities, MN issued this severe thunderstorm warning at Jul 12, 1986, 9:46 PM CDT for Rice County, Steele County, Waseca 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

Counties Rice County, MN, Steele County, MN, Waseca 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 82 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 00:00Z on 1986-07-13Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 457 joules per kilogram.LCLLFCEL10008507005003002001001 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 00:00Z on 1986-07-13The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 52 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
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.

IssuedProductOfficeCountiesLasted
Jul 12, 7:33 PM CDTSevere Thunderstorm WarningMPXCarver, Hennepin, Scott57 min
Jul 12, 8:00 PM CDTSevere Thunderstorm WarningMPXAnoka, Dakota, Hennepin, Ramsey45 min
Jul 12, 9:46 PM CDTSevere Thunderstorm WarningMPXLe Sueur59 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.