Alert archive / Wisconsin / Tornado Warnings in 1987

Tornado Warning 4, NWS Twin Cities, MN

May 13, 1987Pierce County, Saint Croix County, Wisconsin

NWS Twin Cities, MN issued this tornado warning at May 13, 1987, 8:04 PM CDT for Pierce County, Saint Croix County, Wisconsin. It was in force for 41 min.

The area

The counties it named.

The facts

Issued
May 13, 1987, 8:04 PM CDT (01:04 UTC)
Expired
May 13, 1987, 8:45 PM CDT
In force
41 min
Issued by
NWS Twin Cities, MN
Area
Whole counties

Counties Pierce County, WI, 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.

The nearest sounding before it

Minneapolis, MN (KSTC), launched 00:00Z, 1.1 hours before the alert went out and 92 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 1987-05-14Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 732 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 1987-05-14The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 129 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
732 J/kg
Mixed-layer CIN
-105 J/kg
Mixed-layer LCL
1878 m above ground
0-6 km bulk shear
45 kt
0-1 km storm-relative helicity
129 m²/s²
0-3 km storm-relative helicity
191 m²/s²
Significant tornado parameter
0.0
Supercell composite
4.3

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KMSP 140104
TORMSP
WIC109-093-140145-

BULLETIN - IMMEDIATE BROADCAST REQUESTED/EBS ACTIVATION REQUESTED 
TORNADO WARNING
NATIONAL WEATHER SERVICE MINNEAPOLIS MN
804 PM CDT WED MAY 13 1987

THE NATIONAL WEATHER SERVICE HAS ISSUED A TORNADO WARNING 
EFFECTIVE UNTIL 845 PM CDT FOR PEOPLE IN THE FOLLOWING COUNTIES OF

WEST CENTRAL WISCONSIN...SOUTHERN ST CROIX AND PIERCE


AT.....755 PM CDT A TORNADO WAS REPORTED ON THE GROUND 1 MILE
SOUTH OF HASTINGS MINNESOTA MOVING EAST AT 35 MILES AN HOUR.

SOME CITIES IN THE PATH OF THIS TORNADO ARE RIVER FALLS..
ELLSWORTH...TRIMBELLE.

THIS IS A DANGEROUS STORM SITUATION.  ACT QUICKLY.  IF YOU ARE IN
THE PATH OF A TORNADO MOVE TO A SHELTER BELOW GROUND IF AVAIrLABLE.
OTHERWISE..GO TO A SMALL INTERIOR ROOM ON THE LOWEST FLOOR
POSSIBLE.  AVOID WINDOWS.  ABANDON CARS AND MOBILE HOMES FOR A
REINFORCED BUILDING OR GET INTO A DITCH OR CULVERT.

RICHARDSON

The office that day

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

IssuedProductOfficeCountiesLasted
May 13, 8:31 PM CDTSevere Thunderstorm WarningMPXDunn, Pepin39 min

Nearby

Tornado Warnings in Wisconsin, 1987Every tornado warning in 1987Tornadoes in 1987

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.