Alert archive / Wisconsin / Severe Thunderstorm Warnings in 1999
Severe Thunderstorm Warning 40, NWS La Crosse, WI
NWS La Crosse, WI issued this severe thunderstorm warning at Jun 6, 1999, 5:38 PM CDT for Buffalo County, Trempealeau County, Wisconsin. It was in force for 32 min. 3 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
- Jun 6, 1999, 5:38 PM CDT (22:38 UTC)
- Expired
- Jun 6, 1999, 6:10 PM CDT
- In force
- 32 min
- Issued by
- NWS La Crosse, WI
- Area
- Whole counties
Counties Buffalo County, WI, Trempealeau County, WI
The radar
The La Crosse radar (KARX), 65 km from the middle of the area, began a volume at 22:41 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 | Remark |
|---|---|---|---|
| Jun 6, 5:56 PM CDT | Thunderstorm Wind 55 | Mondovi, WI | |
| Jun 6, 5:58 PM CDT | Thunderstorm Wind 52 | Strum, WI | |
| Jun 6, 5:59 PM CDT | Thunderstorm Wind 55 | Mondovi, 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 |
|---|---|---|---|
| Jun 6, 12:45 PM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Jun 6, 5:15 PM CDT | Tornado Watch | SPC | 7 hr |
The nearest sounding before it
Minneapolis, MN (KMPX), launched 12:00Z, 10.6 hours before the alert went out and 171 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.
- Mixed-layer CAPE
- 1851 J/kg
- Mixed-layer CIN
- -82 J/kg
- Mixed-layer LCL
- 752 m above ground
- 0-6 km bulk shear
- 72 kt
- 0-1 km storm-relative helicity
- 283 m²/s²
- 0-3 km storm-relative helicity
- 338 m²/s²
- Significant tornado parameter
- 2.7
- Supercell composite
- 9.4
The text
As transmitted, in the capitals the NWS used until 2016.
622 WUUS1 KLSE 062239 RRA SVRLSE WIC011-121-062310- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE LA CROSSE WI 538 PM CDT SUN JUN 6 1999 THE NATIONAL WEATHER SERVICE IN LA CROSSE HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... NORTHEASTERN BUFFALO COUNTY IN WEST CENTRAL WISCONSIN NORTHERN TREMPEALEAU COUNTY IN WEST CENTRAL WISCONSIN * UNTIL 610 PM CDT * AT 537 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM JUST SOUTHEAST OF GILMANTON OR 50 MILES NORTHWEST OF LA CROSSE... MOVING NORTHEAST AT 40 MPH. * THE SEVERE THUNDERSTORM WILL BE NEAR... NEAR MONDOVI AND ELEVA AT 545 PM THIS STORM HAS A HISTORY OF PRODUCING LARGE HAIL AND DAMAGING WIND. GO INSIDE A STURDY BUILDING AND STAY AWAY FROM WINDOWS NELSON/RIECK
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.
NWS La Crosse, WI wrote its last area forecast discussion before this severe thunderstorm warning went out at Jun 6, 2:56 PM CDT, 2 hours 42 minutes earlier.
Area forecast discussion, Jun 6, 2:56 PM CDT, 2 hours 42 minutes before
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE LA CROSSE WI 252 PM CDT SUN JUNE 6 1999 MAIN FOCUS AGAIN THIS AFTERNOON AND EVENING IS SEVERE WEATHER POTENTIAL. SVR AND TOR WATCHES IN EFFECT FOR ENTIRE CWA EXCEPT FOR TAYLOR COUNTY THROUGH THIS EVENING. GIVEN INCREASING LINEAR SPEED SHEAR DUE TO H3 JET NOSING INTO CENTRAL IOWA...EXPECT AN ACTIVE EVENING ON THE RADAR. THE GOOD NEWS IS THAT ALL MODELS ADVERTISE RIDGING AND GOOD DRYING AFTER MIDNIGHT AS THE VIGOROUS SHORTWAVE AND UPPER TROF MOVE NORTHEASTWARD OVERNIGHT AND MONDAY. MAIN CONCERNS BEYOND TONIGHT FOCUS ON MAX TEMPERATURES NEXT TWO DAYS. EVEN WITH HEIGHTS SOMEWHAT DEPRESSED ON MONDAY...850 TEMPS REMAIN WARM AND GIVEN THE DRYING OCCURRING IN THE LOW LEVELS AND GOOD MIXING...EXPECT LITTLE COOLING FROM TODAY'S READINGS. RIDGE AMPLIFIES ON TUESDAY FOR WARMER CONDITIONS...PROBABLY WELL INTO THE LOWER TO MIDDLE 90S OVER SOUTHWEST WISCONSIN. .LSE...NONE. DEVOIR
In the hours before
Special weather statement, Jun 6, 12:10 PM CDT, 5 hours 28 minutes before
IAZ008>011-018-019-029-030-MNZ079-086>088-094>096-WIZ017-029- 032>034-041>044-053>055-061-070000- HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE LA CROSSE WI 1210 PM CDT SUN JUN 6 1999 ...MODERATE RISK FOR SEVERE THUNDERSTORMS ACROSS SOUTHEAST MINNESOTA...NORTHEAST IOWA...AND WESTERN AND CENTRAL WISCONSIN THIS AFTERNOON AND EVENING... A VERY MOIST AND UNSTABLE AIR MASS WAS LOCATED OVER THE UPPER MISSISSIPPI VALLEY THIS AFTERNOON...WITH SOME CONVECTION ALREADY DEVELOPING. A LINE OF SURFACE CONVERGENCE OVER WESTERN MN WILL MOVE EAST AS THE AFTERNOON WEARS ON...PROVIDING MORE OF A FOCUS FOR THUNDERSTORM DEVELOPMENT. WITH THE ATMOSPHERE SO UNSTABLE AND LINGERING BOUNDARIES FROM EARLY MORNING SHOWERS AND STORMS...STORMS COULD STILL DEVELOP ALMOST ANYWHERE ACROSS THE AREA. FOR TONIGHT...A DISTURBANCE ALOFT WILL COUPLE WITH A COLD FRONT PUSHING IN FROM THE PLAINS...PROVIDING ANOTHER FOCUS FOR POSSIBLE SEVERE THUNDERSTORMS. THE MAIN SEVERE THREAT WILL BE DAMAGING WINDS AND LARGE HAIL. TRAINING THUNDERSTORMS WILL ALSO BE POSSIBLE...WHICH COULD CAUSE FLOODING PROBLEMS TO MANY ALREADY SATURATED LOCATIONS. SPOTTER GROUPS SHOULD REMAIN ALERT FOR POSSIBLE ACTIVATION THIS AFTERNOON AND EVENING. RIECK
Special weather statement, Jun 6, 12:10 PM CDT, 5 hours 28 minutes before
IAZ008>011-018-019-029-030-MNZ079-086>088-094>096-WIZ017-029- 032>034-041>044-053>055-061-070000- HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE LA CROSSE WI 1210 PM CDT SUN JUN 6 1999 ...MODERATE RISK FOR SEVERE THUNDERSTORMS ACROSS SOUTHEAST MINNESOTA...NORTHEAST IOWA...AND WESTERN AND CENTRAL WISCONSIN THIS AFTERNOON AND EVENING... A VERY MOIST AND UNSTABLE AIR MASS WAS LOCATED OVER THE UPPER MISSISSIPPI VALLEY THIS AFTERNOON...WITH SOME CONVECTION ALREADY DEVELOPING. A LINE OF SURFACE CONVERGENCE OVER WESTERN MN WILL MOVE EAST AS THE AFTERNOON WEARS ON...PROVIDING MORE OF A FOCUS FOR THUNDERSTORM DEVELOPMENT. WITH THE ATMOSPHERE SO UNSTABLE AND LINGERING BOUNDARIES FROM EARLY MORNING SHOWERS AND STORMS...STORMS COULD STILL DEVELOP ALMOST ANYWHERE ACROSS THE AREA. FOR TONIGHT...A DISTURBANCE ALOFT WILL COUPLE WITH A COLD FRONT PUSHING IN FROM THE PLAINS...PROVIDING ANOTHER FOCUS FOR POSSIBLE SEVERE THUNDERSTORMS. THE MAIN SEVERE THREAT WILL BE DAMAGING WINDS AND LARGE HAIL. TRAINING THUNDERSTORMS WILL ALSO BE POSSIBLE...WHICH COULD CAUSE FLOODING PROBLEMS TO MANY ALREADY SATURATED LOCATIONS. SPOTTER GROUPS SHOULD REMAIN ALERT FOR POSSIBLE ACTIVATION THIS AFTERNOON AND EVENING. RIECK
The office that day
Everything else NWS La Crosse, WI issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 5, 7:26 PM CDT | Severe Thunderstorm Warning | ARX | Taylor | 34 min |
| Jun 5, 9:52 PM CDT | Severe Thunderstorm Warning | ARX | Buffalo | 68 min |
| Jun 5, 10:31 PM CDT | Severe Thunderstorm Warning | ARX | Trempealeau | 59 min |
| Jun 6, 3:02 PM CDT | Severe Thunderstorm Warning | ARX | Monroe | 63 min |
| Jun 6, 3:29 PM CDT | Severe Thunderstorm Warning | ARX | Juneau | 56 min |
| Jun 6, 5:18 PM CDT | Tornado Warning | ARX | Taylor | 17 min |
Nearby
Severe Thunderstorm Warnings in Wisconsin, 1999Every severe thunderstorm warning in 1999
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.