Alert archive / Minnesota / Tornado Warnings in 1986

Tornado Warning 8, NWS Twin Cities, MN

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

NWS Twin Cities, MN issued this tornado warning at Jul 18, 1986, 5:48 PM CDT for Anoka County, Ramsey County, Washington County, Minnesota. It was in force for 32 min. 1 report came from inside the area while it was in force.

The area

The counties it named, with what was reported inside it.

The facts

Issued: Jul 18, 1986, 5:48 PM CDT (22:48 UTC)
Expired: Jul 18, 1986, 6:20 PM CDT
In force: 32 min
Issued by: NWS Twin Cities, MN
Area: Whole counties

Counties Anoka County, MN, Ramsey County, MN, Washington County, MN

The radar

The WSR-88D network and its archive begin in 1991, so there is no radar volume for this alert.

What was reported inside it

Time	Report	Where	Remark
Jul 18, 6:05 PM CDT	Hail 1.75	Anoka, MN

NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in. Storm Data before 1996 records only tornadoes, thunderstorm wind and hail.

The nearest sounding before it

Minneapolis, MN (KSTC), launched 12:00Z, 10.8 hours before the alert went out and 50 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: 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 182248
TORMSP
MNC053-003-123-163-182320-

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

THE NATIONAL WEATHER SERVICE HAS ISSUED A TORNADO WARNING 
EFFECTIVE UNTIL 620 PM CDT FOR PEOPLE IN THE FOLLOWING COUNTIES OF

EAST CENTRAL MINNESOTA...NORTHEAST HENNEPIN...SOUTHERN ANOKA...
 RAMSEY AND NORTHERN WASHINGTON

AT.....545 PM CDT..RADAR INDICATED A POSSIBLE TORNADO IN THE
BROOKLYN PARK BROOKLYN CENTER AREA OF THE TWIN CITIES METROPOLITAN
AREA. NUMEROUS REPORTS OF FUNNEL CLOUDS HAVE ALSO BEEN RECIEVED
FROM THIS AREA AND THE AREA OF WHITE BEAR LAKE.

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.

RICHARDSON

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 18, 4:54 PM CDT	Tornado Warning	MPX	Anoka, Hennepin, Ramsey	36 min
Jul 18, 5:00 PM CDT	Severe Thunderstorm Warning	MPX	Sherburne	60 min
Jul 18, 5:23 PM CDT	Tornado Warning	MPX	Ramsey, Washington	27 min
Jul 18, 5:48 PM CDT	Tornado Warning	MPX	Hennepin	32 min
Jul 18, 6:25 PM CDT	Severe Thunderstorm Warning	MPX	Chisago	55 min
Jul 18, 6:40 PM CDT	Severe Thunderstorm Warning	MPX	Chippewa	65 min

Nearby

Tornado Warnings in Minnesota, 1986 Every tornado warning in 1986 Tornadoes 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.