Alert archive / Minnesota / Tornado Warnings in 1986

Tornado Warning 6, NWS Twin Cities, MN

July 18, 1986Anoka County, Hennepin County, Ramsey County, Minnesota

NWS Twin Cities, MN issued this tornado warning at Jul 18, 1986, 4:54 PM CDT for Anoka County, Hennepin County, Ramsey County, Minnesota. It was in force for 36 min.

The area

The counties it named.

The facts

Issued
Jul 18, 1986, 4:54 PM CDT (21:54 UTC)
Expired
Jul 18, 1986, 5:30 PM CDT
In force
36 min
Issued by
NWS Twin Cities, MN
Area
Whole counties

Counties Anoka County, MN, Hennepin County, MN, Ramsey 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, 9.9 hours before the alert went out and 38 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 1986-07-18Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2817 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 12:00Z on 1986-07-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 16 square meters per square second.1939Sfc1 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
2817 J/kg
Mixed-layer CIN
-78 J/kg
Mixed-layer LCL
862 m above ground
0-6 km bulk shear
22 kt
0-1 km storm-relative helicity
16 m²/s²
0-3 km storm-relative helicity
36 m²/s²
Significant tornado parameter
0.0
Supercell composite
3.1

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KMSP 182154
TORMSP
MNC053-003-123-182230-

BULLETIN - IMMEDIATE BROADCAST REQUESTED/EBS ACTIVATION REQUESTED 
TORNADO WARNING
NATIONAL WEATHER SERVICE MINNEAPOLIS MN
454 PM CDT FRI JUL 18 1986

THE NATIONAL WEATHER SERVICE HAS ISSUED A TORNADO WARNING 
EFFECTIVE UNTIL 530 PM CDT FOR PEOPLE IN THE FOLLOWING COUNTIES OF

EAST CENTRAL MINNESOTA...EASTERN HENNEPIN...SOUTHERN ANOKA AND RAMSEY

AT.....450 PM LAW ENFORCEMENT PERSONNEL REPORTED A TORNADO ON THE
GR@OUND IN BROOKLYN CENTER MINNESOTA.

IF YOU ARE IN THE PATH OF A TORNADO..GO TO A BASEMENT SHELTER OR
A CENTRAL INTERIOR ROOM ON THE LOWEST FLOOR. ABANDON CARS AND
MOBILE HOMES FOR A REINFORCED BUILDING.

TOGSTAD

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 18, 5:00 PM CDTSevere Thunderstorm WarningMPXSherburne60 min
Jul 18, 5:23 PM CDTTornado WarningMPXRamsey, Washington27 min
Jul 18, 5:48 PM CDTTornado WarningMPXAnoka, Ramsey, Washington32 min
Jul 18, 5:48 PM CDTTornado WarningMPXHennepin32 min
Jul 18, 6:25 PM CDTSevere Thunderstorm WarningMPXChisago55 min
Jul 18, 6:40 PM CDTSevere Thunderstorm WarningMPXChippewa65 min

Nearby

Tornado Warnings in Minnesota, 1986Every tornado warning in 1986Tornadoes 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.