Alert archive / Wisconsin / Severe Thunderstorm Warnings in 1987

Severe Thunderstorm Warning 128, NWS Twin Cities, MN

August 29, 1987Polk County, Wisconsin

NWS Twin Cities, MN issued this severe thunderstorm warning at Aug 29, 1987, 9:25 PM CDT for Polk County, Wisconsin. It was in force for 35 min.

The area

The counties it named.

The facts

Issued
Aug 29, 1987, 9:25 PM CDT (02:25 UTC)
Expired
Aug 29, 1987, 10:00 PM CDT
In force
35 min
Issued by
NWS Twin Cities, MN
Area
Whole counties

County Polk 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, 2.4 hours before the alert went out and 113 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 1987-08-30Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1569 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 1987-08-30The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 183 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
1569 J/kg
Mixed-layer CIN
-37 J/kg
Mixed-layer LCL
1398 m above ground
0-6 km bulk shear
40 kt
0-1 km storm-relative helicity
183 m²/s²
0-3 km storm-relative helicity
341 m²/s²
Significant tornado parameter
1.2
Supercell composite
12.7

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KMSP 300225
SVRMSP
WIC095-300300-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MINNEAPOLIS MN
925 PM CDT SAT AUG 29 1987

THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM 
WARNING EFFECTIVE UNTIL 1000 PM CDT FOR PEOPLE IN THE FOLLOWING 
COUNTY OF

WEST CENTRAL WISCONSIN...
 NORTH AND CENTRAL POLK


AT...920 PM CDT A SEVERE THUNDERSTORM WAS LOCATED 35 MILES
NORTHEAST OF DOWTOWN ST PAUL IN EAST CENTRAL MINNESOTA JUST WEST
OF ST CROIX FALLS.

THE STORM WAS MOVING RAPIDLY EAST AT 55 MILES AN HOUR.

SOME CITIES IN THE PATH OF THIS STORM INCLUDE BALSAM LAKE...
LUCK AND CUSHING.

REMEMBER SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 60
MPH..DESTRUCTIVE HAIL..DEADLY LIGHTNING AND VERY HEAVY RAIN. 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 MOVE TO A PLACE OF SAFETY IF ONE I]S SPOTTED.

MILLER

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

In the hours before

Special weather statement, Aug 29, 7:53 PM CDT, 1 hour 32 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MINNEAPOLIS/ST PAUL MN
750 PM CDT SAT AUG 29 1987

AT 750 PM...ISOLATED THUNDERSTORMS WITH HEAVY RAIN WERE OCCURRING
NEAR LITCHFIELD IN SOUTHERN MCLEOD COUNTY OF CENTRAL MINNESOTA...
AND NEAR PRINCETON IN SOUTHERN MILLE LACS COUNTY OF EAST CENTRAL
MINNESOTA.  ALTHOUGH NO REPORTS OF SEVERE WEATHER HAD BEEN RECIEVED
...THE RAPID DEVELOPMENT OF THESE THUNDERSTORMS SUGGESTS THAT
THEY MAY HAVE THE POTENTIAL TO PRODUCE STRONG GUSTY WINDS.  MARBLE
SIZE HAIL WAS REPORTED AT PRINCETON AT ABOUT 750 PM.

MOVEMENT WAS TO THE EAST AT 30 TO 35 MILES AN HOUR.  THESE THUNDERSTORMS
WILL BE MOVING ACROSS ISANTI AND WRIGHT COUNTIES OF CENTRAL AND EAST
CENTRAL	 MINNESOTA BETWEEN 750 PM AND 830 PM.

IF THREATENING WEATHER APPROACHES...SEEK SAFE SHELTER AND IF POSSIBLE
RELAY REPORTS OF THE WEATHER TO LAW ENFORCEMENT OFFICIALS.
KRAFT

Nearby

Severe Thunderstorm Warnings in Wisconsin, 1987Every severe thunderstorm warning 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.