Alert archive / Wisconsin / Severe Thunderstorm Warnings in 2001

Severe Thunderstorm Warning 13, NWS La Crosse, WI

April 11, 2001Crawford County, Grant County, Wisconsin; Allamakee County, Clayton County, Iowa

NWS La Crosse, WI issued this severe thunderstorm warning at Apr 11, 2001, 6:26 PM CDT for Crawford County, Grant County, Wisconsin; Allamakee County, Clayton County, Iowa. It was in force for 64 min. 7 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: Apr 11, 2001, 6:26 PM CDT (23:26 UTC)
Expired: Apr 11, 2001, 7:30 PM CDT
In force: 64 min
Issued by: NWS La Crosse, WI
Area: Whole counties

Counties Allamakee County, IA, Clayton County, IA, Crawford County, WI, Grant County, WI

The radar

The La Crosse radar (KARX), 85 km from the middle of the area, began a volume at 23:26 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

What was reported inside it

Time	Report	Where
Apr 11, 6:30 PM CDT	Thunderstorm Wind 52 E	Mc Gregor, IA
Apr 11, 6:40 PM CDT	Thunderstorm Wind 53 E	Glenhaven, WI
Apr 11, 6:40 PM CDT	Thunderstorm Wind 55 E	Potosi, WI
Apr 11, 6:45 PM CDT	Thunderstorm Wind 52 E	Lansing, IA
Apr 11, 6:45 PM CDT	Hail 0.88	Lansing, IA
Apr 11, 7:12 PM CDT	Thunderstorm Wind 52 E	Steuben, WI
Apr 11, 7:15 PM CDT	Thunderstorm Wind 52 E	Boscobel, 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.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Apr 11, 4:00 PM CDT	Tornado Watch	SPC	6 hr

The nearest sounding before it

Davenport, (KDVN), launched 12:00Z, 11.4 hours before the alert went out and 167 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 196 J/kg
Mixed-layer CIN: -182 J/kg
Mixed-layer LCL: 822 m above ground
0-6 km bulk shear: 63 kt
0-1 km storm-relative helicity: 336 m²/s²
0-3 km storm-relative helicity: 387 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.8

Open this sounding in Storm Lab

The text

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

000 
WUUS53 KARX 112327
SVRLSE
IAC005-043-WIC023-043-120030-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE LA CROSSE WI
626 PM CDT WED APR 11 2001

THE NATIONAL WEATHER SERVICE IN LA CROSSE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  EASTERN CLAYTON COUNTY IN NORTHEAST IOWA
  EASTERN ALLAMAKEE COUNTY IN NORTHEAST IOWA
  CRAWFORD COUNTY IN SOUTHWEST WISCONSIN
  WESTERN GRANT COUNTY IN SOUTHWEST WISCONSIN

* UNTIL 730 PM CDT

* AT 626 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  LINE OF SEVERE THUNDERSTORMS PRODUCING DAMAGING WINDS FROM 9 MILES
  NORTHEAST OF ELKADER TO 12 MILES SOUTH OF GUTTENBERG...MOVING NORTH
  AT 55 MPH.

* THE SEVERE THUNDERSTORMS ARE EXPECTED TO BE...
  NEAR PRAIRIE DU CHIEN AT 635 PM...
  NEAR BLOOMINGTON AND HARPERS FERRY AT 640 PM CDT...
  NEAR LANSING AT 645 PM CDT...
  NEAR BOSCOBEL AT 650 PM CDT...

A TORNADO WATCH REMAINS IN EFFECT UNTIL 1000 PM CDT WEDNESDAY EVENING
FOR NORTHEASTERN IOWA AND SOUTHWEST WISCONSIN. 

SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND GUSTS 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.

$$

NELSON

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 11, 7:38 AM CDT	Flash Flood Warning	ARX	Buffalo	3 hr
Apr 11, 4:34 PM CDT	Severe Thunderstorm Warning	ARX	Floyd, Mitchell	41 min
Apr 11, 4:58 PM CDT	Severe Thunderstorm Warning	ARX	Chickasaw, Howard	47 min
Apr 11, 5:11 PM CDT	Tornado Warning	ARX	Fayette	64 min
Apr 11, 5:17 PM CDT	Severe Thunderstorm Warning	ARX	Floyd, Mitchell	28 min
Apr 11, 6:00 PM CDT	Tornado Warning	ARX	Winneshiek	45 min

Nearby

Severe Thunderstorm Warnings in Wisconsin, 2001 Severe Thunderstorm Warnings in Iowa, 2001 Every severe thunderstorm warning in 2001

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; radar from the NEXRAD Level II archive.