Alert archive / Wisconsin / Severe Thunderstorm Warnings in 1986

Severe Thunderstorm Warning 166, NWS Twin Cities, MN

August 16, 1986Saint Croix County, Wisconsin

NWS Twin Cities, MN issued this severe thunderstorm warning at Aug 16, 1986, 8:46 PM CDT for Saint Croix County, Wisconsin. It was in force for 54 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: Aug 16, 1986, 8:46 PM CDT (01:46 UTC)
Expired: Aug 16, 1986, 9:40 PM CDT
In force: 54 min
Issued by: NWS Twin Cities, MN
Area: Whole counties

County Saint Croix County, WI

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
Aug 16, 8:49 PM CDT	Hail 0.75	St. Croix, WI

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 00:00Z, 1.8 hours before the alert went out and 93 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 3000 m above ground
0-6 km bulk shear: 41 kt
0-1 km storm-relative helicity: -91 m²/s²
0-3 km storm-relative helicity: 123 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 170146
SVRMSP
WIC109-170240-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MINNEAPOLIS MN
846 PM CDT SAT AUG 16 1986

THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM 
WARNING EFFECTIVE UNTIL 940 PM CDT FOR PEOPLE IN THE FOLLOWING 
COUNTY OF

WEST CENTRAL WISCONSIN...ST CROIX

AT 840 PM A SEVERE THUNDERSTORM WAS MOVING EAST FROM WASHINGTON
COUNTY OF EXTREME EAST CENTRAL MINNESOTA ACROSS THE ST CROIX RIVER
INTO WESTERN ST CROIX COUNTY.  THIS STORM PRODUCED GOLF BALL HAIL
AS IT MOVED THROUGH CENTRAL WASHINGTON COUNTY.  THIS STORM WILL BE
AFFECTING THE CITIES OF BAYPORT...HUDSON...AND SOMMERSET IN
WESTERN ST CROIX COUNTY OF EXTREME WEST CENTRAL WISCONSIN.

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 LOOKOFUT AND BE PREPARED TO MOVE TO A PLACE OF
SAFETY IF ONE IS SPOTTED.

PAULSON

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 16, 7:21 PM CDT	Severe Thunderstorm Warning	MPX	Dunn	54 min
Aug 17, 1:59 AM CDT	Severe Thunderstorm Warning	MPX	Pierce	61 min

Nearby

Severe Thunderstorm Warnings in Wisconsin, 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.