Alert archive / Wisconsin / Severe Thunderstorm Warnings in 1991

Severe Thunderstorm Warning 61, NWS Twin Cities, MN

May 31, 1991Pierce County, Wisconsin

NWS Twin Cities, MN issued this severe thunderstorm warning at May 31, 1991, 8:42 AM CDT for Pierce County, Wisconsin. It was in force for 33 min.

The area

The counties it named.

The facts

Issued
May 31, 1991, 8:42 AM CDT (13:42 UTC)
Expired
May 31, 1991, 9:15 AM CDT
In force
33 min
Issued by
NWS Twin Cities, MN
Area
Whole counties

County Pierce County, WI

The nearest sounding before it

Minneapolis, MN (KSTC), launched 12:00Z, 1.7 hours before the alert went out and 94 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 1991-05-31Temperature 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 1991-05-31The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 75 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
NaN m above ground
0-6 km bulk shear
35 kt
0-1 km storm-relative helicity
75 m²/s²
0-3 km storm-relative helicity
62 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.9

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KMSP 311340
SVRMSP
WIC093-311415-
 
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MINNEAPOLIS MN
842 AM CDT FRI MAY 31 1991
 
THE NATIONAL WEATHER SERVICE IN MINNEAPOLIS HAS ISSUED A
SEVERE THUNDERSTORM WARNING     EFFECTIVE UNTIL  915 AM CDT
FOR PEOPLE IN THE FOLLOWING LOCATION
 
IN WEST CENTRAL WISCONSIN
 
   ...PIERCE COUNTY
 
AT 830 AM CDT...RADAR INDICATED A SEVERE THUNDERSTORM JUST EAST OF RED
WING MINNESOTA OR ABOUT 25 MILES SOUTHEAST OF THE TWIN CITIES. RADAR
INDICATED THAT THE STORM COULD PRODUCE LARGE HAIL. THE THUNDERSTORM WAS
MOVING TO THE NORTHEAST AT 40 MPH TOWARDS THE TOWNS OF DIAMOND
BLUFF...ELLSWORTH...AND ELMWOOD.
 
WHEN THUNDERSTORMS ARE EOCCURRING..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.

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, May 31, 6:37 AM CDT, 2 hours 5 minutes before
MNZ014-015-016-018-311245-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MINNEAPOLIS MN
637 AM CDT FRI MAY 31 1991

...STRONG THUNDERSTORMS WITH VERY HEAVY RAINS ROLL INTO CENTRAL
MINNESOTA...

WEATHER RADAR AT 625 AM SHOWED A CLUSTER OF VERY STRONG THUNDERSTORMS
ABOUT 50 MILES WEST OF THE TWIN CITIES IN THE COKATO...HUTCHINSON..
AND GLENCOE AREA.  AT AROUND 615 AM HAIL...SOME OF IT NEAR DIME
SIZE..WAS REPORTED AT CEDAR MILLS IN SOUTHERN MEEKER COUNTY.  THIS IS
ABOUT 20 MILES SOUTH OF LITCHFIELD.  PERSONS IN WRIGHT AND MCLEOD
AND WESTERN CARVER COUNTIES SHOUDL BE ALERT TO THE POSSIBILITY OF VERY
HEAVY DOWNPOURS AND SOME HAIL FROM THESE THUNDERSTORMS BETWEEN 625 AND
730AM.

ANOTHER CLUSTER OF STRONG THUNDERSTORMS WAS LOCATED SOUTHWEST OF THE
TWIN CITIES IN THE ST PETER...NICOLETT...WATERVILLE AREA.  THESE
THUNDERSTORNS WILL BE AFFECTING THE COUTIES OF NICOLLETT..LE SEUER..AND
SOUTEHRN SCOTT BETWEEN 625 AND 730 AM.

ALL TSHUNDERSTORMS WERE MOVING NORTHEAST AT 20 MPH.
PAULSON
Special weather statement, May 31, 6:43 AM CDT, 1 hour 59 minutes before
MNZ014-311245-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST CLOUD MINNESOTA
643 AM CDT FRI MAY 31 1991

...THUNDERSTORMS WITH HEAVY RAIN IN CENTRAL MINNESOTA...

AT 640 AM THUNDERSTORMS SOME^ WITH VERY HEAVY RAIN...AND POSSIBLE
SMALL HAIL WERE NEAR ST CLOUD AND THEN NORTHWEST TO ALEXANDRIA.
THE STRONGEST STORM WAS NEAR ALBANY...15 MILES NORTHWEST OF ST CLOUD.

THE STORMS WERE MOVING NORTHEAST AT 25 MPH.

NNNN
Special weather statement, May 31, 7:54 AM CDT, 48 minutes before
MNZ014-015-016-311400-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MINNEAPOLIS MN
753 AM CDT FRI MAY 31 1991

...STRONG THUNDERSTORMS SWEEPING ACROSS THE TWIN CITY METRO AREA...

AT 750 AM...RADAR INDICATED A LINE OF THUNDERSTORMS ACROSS THE
CENTRAL SECTIONS OF THE METROPOLITAN AREA.  SOME OF THESE STORMS
HAD PRODUCED PEA TO MARBLE SIZE HAIL...ALONG WITH WIND GUSTS
OF 40 MPH.  ALSO TORRENTIAL RAINS HAVE BEEN CAUSING NEAR
ZERO VISIBILITY.

AT 750 AM THE LINE RAN FROM NEAR ROGERS IN NORTHERN HENNEPIN
COUNTY THEN THROUGH DOWNTOWN MINNEAPOLIS TO JUST SOUTH OF THE
MINNESOTA RIVER.  THE STORMS WILL CONTINUE TO MOVE NORTHEAST AT
25 TO 30 MPH ACROSS EASTERN HENNEPIN..ANOKA..RAMSEY..WASHINGTON
...AND NORTHERN DAKOTA COUNTIES.

THE STORMS WILL MOVE ACROSS THE EASTERN TWIN CITIES AREA BETWEEN
745AM  AND 9AM.

SOME STREET FLOODING IS ALSO POSSIBLE FROM SOME OF THE
STRONGER THUNDERSTORMS.  MOTORISTS SHOULD BE ALERT TO THE
POSSIBLITY OF WATER STANDING OR FLOWING ACROSS ROADWAYS.

WINDS OF 40 TO 50 MPH AND HAIL ARE STILL POSSIBLE FROM THESE
THUNDERSTORMS.

FINALLY...STORMS SOMETIMES REINTENSIFY SUDDENLY...SO LISTEN FOR
LATER STATEMENTS AND POSSIBLE WARNINGS.
PAULSON

The office that day

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

IssuedProductOfficeCountiesLasted
May 31, 9:11 AM CDTSevere Thunderstorm WarningMPXDunn49 min

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.