Alert archive / Minnesota / Severe Thunderstorm Warnings in 1986

Severe Thunderstorm Warning 29, NWS Twin Cities, MN

May 12, 1986Washington County, Minnesota

NWS Twin Cities, MN issued this severe thunderstorm warning at May 12, 1986, 5:34 PM CDT for Washington County, Minnesota. It was in force for 56 min.

The area

The counties it named.

The facts

Issued: May 12, 1986, 5:34 PM CDT (22:34 UTC)
Expired: May 12, 1986, 6:30 PM CDT
In force: 56 min
Issued by: NWS Twin Cities, MN
Area: Whole counties

County Washington 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, 10.6 hours before the alert went out and 60 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: 62 J/kg
Mixed-layer CIN: -206 J/kg
Mixed-layer LCL: 776 m above ground
0-6 km bulk shear: 20 kt
0-1 km storm-relative helicity: 134 m²/s²
0-3 km storm-relative helicity: 93 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KMSP 122234
SVRMSP
MNC053-003-123-163-122330-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MINNEAPOLIS MN
534 PM CDT MON MAY 12 1986

THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM 
WARNING EFFECTIVE UNTIL 630 PM CDT FOR PEOPLE IN THE FOLLOWING 
COUNTIES OF

EAST CENTRAL MINNESOTA...HENNEPIN...SOUTHEAST ANOKA...RAMSEY AND 
 NORTHWEST WASHINGTON

AT 525 PM LARGE HAIL WAS REPORTED BY STATE POLICE AT NEW BRIGHTON
MINNESOTA AND 1 INCH HAIL WAS REPORTED IN ST ANTHONY MINNESOTA.
PERSONS IN THE SEVEN COUNTY METROPOLITAN AREA SHOULD BE ALERT FOR
HAIL AND POSSIBLE STRONG WINDS. THESE STORMS WERE MOVING NORTHEAST
AT ABOUT 35 MILES AN HOUR.

REMEMBER SEVERE THUNDERSTORMS PRODUCE STRONG DAMAGING WINDS..LARGE
HAIL AND FREQUENT LIGHTNING STRIKES. ALSO SEVERE THUNDERSTORMS CAN
AND OCCASIONALLY DO PRODUCE A TORNADO WITH LITTLE OR NO ADVANCE
WARNING..SO BE ON THE LOOKOUT AND BE PREPARED TO MOV2E TO A PLACE OF
SAFETY IF ONE IS SPOTTED.

COLEMAN

The office that day

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

Issued	Product	Office	Counties	Lasted
May 12, 3:39 PM CDT	Severe Thunderstorm Warning	MPX	McLeod	26 min
May 12, 3:50 PM CDT	Severe Thunderstorm Warning	MPX	Renville	20 min
May 12, 4:10 PM CDT	Severe Thunderstorm Warning	MPX	Redwood, Renville	50 min
May 12, 4:10 PM CDT	Severe Thunderstorm Warning	MPX	McLeod	50 min
May 12, 4:41 PM CDT	Tornado Warning	MPX	Carver, McLeod, Wright	29 min
May 12, 5:08 PM CDT	Tornado Warning	MPX	Carver, McLeod, Wright	2 min
May 12, 5:30 PM CDT	Severe Thunderstorm Warning	MPX	Meeker	60 min
May 12, 5:34 PM CDT	Severe Thunderstorm Warning	MPX	Anoka, Hennepin, Ramsey	56 min
May 12, 6:06 PM CDT	Severe Thunderstorm Warning	MPX	Carver, McLeod, Wright	24 min
May 12, 6:24 PM CDT	Severe Thunderstorm Warning	MPX	Carver, McLeod, Wright	6 min
May 12, 6:27 PM CDT	Severe Thunderstorm Warning	MPX	Carver, Hennepin	33 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.