Alert archive / Wisconsin / Severe Thunderstorm Warnings in 1991

Severe Thunderstorm Warning 1, NWS Twin Cities, MN

April 7, 1991Barron County, Dunn County, Saint Croix County, Wisconsin

NWS Twin Cities, MN issued this severe thunderstorm warning at Apr 7, 1991, 5:16 PM CDT for Barron County, Dunn County, Saint Croix County, Wisconsin. It was in force for 44 min.

The area

The counties it named.

The facts

Issued
Apr 7, 1991, 5:16 PM CDT (22:16 UTC)
Expired
Apr 7, 1991, 6:00 PM CDT
In force
44 min
Issued by
NWS Twin Cities, MN
Area
Whole counties

Counties Barron County, WI, Dunn County, WI, Saint Croix County, WI

The nearest sounding before it

Minneapolis, MN (KSTC), launched 12:00Z, 10.3 hours before the alert went out and 125 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 12:00Z on 1991-04-07Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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 12:00Z on 1991-04-07The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 66 square meters per square second.19395878Sfc1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1616 m above ground
0-6 km bulk shear
53 kt
0-1 km storm-relative helicity
66 m²/s²
0-3 km storm-relative helicity
158 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 072217
SVRMSP
WIC005-033-109-072300-
 
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MINNEAPOLIS MN
516 PM CDT SUN APR 7 1991
 
THE NATIONAL WEATHER SERVICE IN MINNEAPOLIS HAS ISSUED A
SEVERE THUNDERSTORM WARNING     EFFECTIVE UNTIL  600 PM CDT
FOR PEOPLE IN THE FOLLOWING LOCATION                        S...
 
IN WEST CENTRAL WISCONSIN
 
   ...SOUTHWESTERN BARRON COUNTY...NORTHWESTERN DUNN COUNTY
   ...EASTERN ST CROIX COUNTY
 
 
AT 510 PM CDT THIS SUNDAY...NATIONAL SERVICE RADAR DEDECTS A SEVERE
THUNDERSTORM WITH LARGE HAIL OVER NORTHEAST ST. CROIX COUNTY. THE
STORM IS MOVING NORTHEAST AT 25 MPH AND THIS WOULD CARRY THE STORM
ACROSS REEVE IN SOUTHWEST BARRON COUNTY TO NEAR BARRON BY ABOUT
6 PM THIS SUNDAY EVENING.  THE STORM IS 35 MILES NORTHWEST OF EAU
CLAIRE WISCONSIN.
 
WHEN THUNDERSTORMS ARE OCCURRING..MOVE INSIDE A STRONG BUILDING
DO NOT STAND BY WINDOWS.  DON'T USE TELEPHONES OR ELECTRICAL
APPLIANCES UNLESS IN AN EMERGENCY. REMEMBER SEVERE THUNDERSTORMS
CAN AND OCCASIONALLY DO PRODUCE TORNADOS WITH LITTLE OR NO WARNING.
 
SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 55
MPH...DESTRUCTIVE HAIL...DEADLY LIGHTNING...AND VERY HEAVY RAIN.
FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR
OF YOUR HOME OR BUSINESS.  HEAVY RAINS FLOOD ROADS QUICKLY SO
DON'T DRIVE INTO AREAS WHERE WATER COVERS THE ROAD.

Nearby

Severe Thunderstorm Warnings in Wisconsin, 1991Every severe thunderstorm warning in 1991

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.