Alert archive / Wisconsin / Severe Thunderstorm Warnings in 1991

Severe Thunderstorm Warning 12, NWS La Crosse, WI

September 9, 1991La Crosse County, Wisconsin

NWS La Crosse, WI issued this severe thunderstorm warning at Sep 9, 1991, 4:26 PM CDT for La Crosse County, Wisconsin. It was in force for 39 min. 2 reports 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
Sep 9, 1991, 4:26 PM CDT (21:26 UTC)
Expired
Sep 9, 1991, 5:05 PM CDT
In force
39 min
Issued by
NWS La Crosse, WI
Area
Whole counties

County La Crosse County, WI

What was reported inside it

TimeReportWhereRemark
Sep 9, 4:30 PM CDTHail 0.75La Crosse, WI
Sep 9, 4:45 PM CDTHail 1La Crosse, 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

Green Bay/Straub, WI (KGRB), launched 12:00Z, 9.4 hours before the alert went out and 249 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, Green Bay/Straub, WI at 12:00Z on 1991-09-09Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 649 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, Green Bay/Straub, WI at 12:00Z on 1991-09-09The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 219 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
649 J/kg
Mixed-layer CIN
-128 J/kg
Mixed-layer LCL
824 m above ground
0-6 km bulk shear
35 kt
0-1 km storm-relative helicity
219 m²/s²
0-3 km storm-relative helicity
222 m²/s²
Significant tornado parameter
0.0
Supercell composite
2.8

Open this sounding in Storm Lab

The text

The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.

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, Sep 9, 3:30 PM CDT, 56 minutes before
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Special weather statement, Sep 9, 3:37 PM CDT, 49 minutes before
WIZ010-014-092130-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE LA CROSSE WI
337 PM CDT MON SEP 9 1991

AT 335 PM...RADAR INDICATED A LINE OF THUNDERSTORMS EXTENDING FROM LA
CROSSE THROUGH EXTREME SOUTHEAST MINNESOTA...INTO EXTREME NORTHEAST
IOWA.  ANOTHER THUNDERSTORM WAS LOCATED NEAR BLACK RIVER FALLS
...OR 40 MILES NORTHEAST OF LA CROSSE.

ALL THUNDERSTORMS WERE MOVING NORTHEAST AT 40 MILES AN HOUR AND
WILL PRODUCE SOME BRIEF HEAVY RAIN.^..GUSTY WINDS...AND DANGEROUS
LIGHTNING.

IF A THUNDERSTORM APPROACHES YOUR AREA...MOVE INDOORS.  GET OFF
AREA LAKES AND RIVERS AND HEAD FOR SHELTER.  REMEMBER...LIGHTNING
IS A STORMS WORST KILLER.

INGRAM
Special weather statement, Sep 9, 3:40 PM CDT, 46 minutes before
WIZ010-014-092130-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE LA CROSSE WI
340 PM CDT MON SEP 9 1991

AT 335 PM...RADAR INDICATED A LINE OF THUNDERSTORMS EXTENDING FROM LA
CROSSE THROUGH EXTREME SOUTHEAST MINNESOTA...INTO EXTREME NORTHEAST
IOWA.  ANOTHER THUNDERSTORM WAS LOCATED NEAR BLACK RIVER FALLS
...OR 40 MILES NORTHEAST OF LA CROSSE.

PEA SIZED HAIL WAS REPORTED AT CALEDONIA MINNESOTA AT 335 PM.

ALL THUNDERSTORMS WERE MOVING NORTHEAST AT 40 MILES AN HOUR AND
WILL PRODUCE SOME BRIEF HEAVY RAIN...GUSTY WINDS...AND DANGEROUS
LIGHTNING...AND SMALL HAIL.

IF A THUNDERSTORM APPROACHES YOUR AREA...MOVE INDOORS.  GET OFF
AREA LAKES AND RIVERS AND HEAD FOR SHELTER.  REMEMBER...LIGHTNING
IS A STORMS WORST KILLER.

INGRAM
Special weather statement, Sep 9, 4:18 PM CDT, 8 minutes before
WIZ010-014-092220-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE LA CROSSE WI
417 PM CDT MON SEP 9 1991

AT 415 PM...RADAR INDICATED TWO BANDS OF SHOWERS AND THUNDERSTORMS
IN WEST CENTRAL WISCONSIN.  THE NORTHERN BAND EXTENDED FROM
WHITEHALL...40 MILES NORTH OF LA CROSSE...THEN TO THE NORTHEAST INTO
CENTRAL WISCONSIN.

THE SECOND BAND EXTENDED FROM NEAR MARSHFIELD TO LA CROSSE THEN
INTO EXTREME SOUTHEAST MINNESOTA AND NORTHEAST IOWA.

THE THUNDERSTORMS WERE MOVING NORTHEAST AT 35 MILES AN HOUR AND
WILL PRODUCE SOME VERY HEAVY RAIN...GUSTY WINDS...DANGEROUS
LIGHTNING...AND SMALL HAIL.

IF A THUNDERSTORM APPROACHES YOUR AREA...MOVE INDOORS.  GET OFF
AREA LAKES AND RIVERS AND HEAD FOR SHELTER. STAY INDOORS UNTIL THE
STORM PASSES.  REMEMBER...LIGHTNING IS A STORMS WORST KILLER.

INGRAM
Special weather statement, Sep 9, 4:26 PM CDT, 0 minutes before
MNZ019-092215-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE ROCHESTER MN
415 PM CDT MON SEP 9 1991

...A LINE OF STRONG THUNDERSTORMS CONTINUE ACROSS SOUTHEAST MINNESOTA
INTO WEST CENTRAL WISCONSIN...

AT 405 PM RADAR INDICATED A LINE OF THUNDERSTORMS SOME WITH INTENSE
RAIN AND SMALL HAIL FROM 30 MILES SOUTHWEST OF LA CROSSE TO 50 MILES
NORTHEAST OF LA CROSSE. OTHER THUNDERSTORMS WERE IN CENTRAL IOWA NEAR
WATERLOO AND IN WESTERN WISONSIN NEAR ARCADIA. A NEW THUNDERSTORM HAD
ALSO DEVELOPED 30 MILES NORTHWEST OF ROCHESTER NEAR KENYON.

THESE THUNDERSTORMS WERE MOVING NORTHEAST AT 30 MPH.

NO SEVERE WEATHER HAS BEEN REPORTED WITH THESE STORMS.

DANGEROUS LIGHTNING...POSSIBLE HAIL...AvND VERY HEAVY RAIN CAN BE
EXPECTED.

PERSONS IN FILMORE COUNTY OF EXTREME SOUTHEAST MINNESOTA AND
VERNON...LA CROSSE...AND MONROE COUNTIES OF WEST CENTRAL WISCONSIN
SHOULD REMAIN ALERT AS THESE THUNDERSTORMS APPROACH YOUR AREA.

KRUSE

The office that day

Everything else NWS La Crosse, WI issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Sep 9, 6:35 PM CDTSevere Thunderstorm WarningARXCrawford55 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.