Alert archive / Wisconsin / Severe Thunderstorm Warnings in 1987
Severe Thunderstorm Warning 5, NWS La Crosse, WI
NWS La Crosse, WI issued this severe thunderstorm warning at Jul 20, 1987, 2:44 PM CDT for Jackson County, Wisconsin. It was in force for 41 min.
The area
The counties it named.
The facts
- Issued
- Jul 20, 1987, 2:44 PM CDT (19:44 UTC)
- Expired
- Jul 20, 1987, 3:25 PM CDT
- In force
- 41 min
- Issued by
- NWS La Crosse, WI
- Area
- Whole counties
County Jackson County, WI
The radar
The WSR-88D network and its archive begin in 1991, so there is no radar volume for this alert.
The nearest sounding before it
Green Bay/Straub, WI (KGRB), launched 12:00Z, 7.7 hours before the alert went out and 216 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
- 3840 J/kg
- Mixed-layer CIN
- -4 J/kg
- Mixed-layer LCL
- 653 m above ground
- 0-6 km bulk shear
- 13 kt
- 0-1 km storm-relative helicity
- 20 m²/s²
- 0-3 km storm-relative helicity
- 73 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KLSE 201943 SVRLSE WIC053-112025- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE LA CROSSE WI 244 PM CDT MON JUL 20 1987 THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 325 PM CDT FOR PEOPLE IN THE FOLLOWING COUNTY OF WEST CENTRAL WISCONSIN...WESTERN HALF JACKSON COUNTY WEATHER RADAR SHOWED A LINE OF SEVERE THUNDERSTORMS MOVING INTO NORTHERN JACKSON COUNTY. THESE SEVERE THUNDERSTORMS WILL BE MOVING INTO THE TOWNS OF HIXTON AND BLACK RIVER FALLS IN JACKSON COUNTY BY 350 PM CDT THIS AFTERNOON. THE WARNING IS IN EFFECT AREAS NEAR AND WEST OF THE CITY OF BLACK RIVER FALLS IN JACKSON COUNTY. PERSONS IN THE PATH OF THESE THUNDERSTORMS SHOULD SEEK SHELTER IMMEDIATELY IF THREATING WEATHER IS SIGHTED. SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 60 MILES PER HOUR..DEADLY LIGHTNING..HAIL 3/4 INCH OR MORE IN DIAMETER..AND HEAVY RAIN THAT CAN QUICKLY FLOOD LOW LYING AREAS. REMEMBER..SEVERE THUNDERSTORMS CAN PRODUCE TORNADOES WITHOUT WARNING. IF THREATENING WEATHER APPROACHES..GO FOR SAFE SHELTER IN A REINFORCED BUILDING SUCH AS YOUR HOME. IF CAUGHT OUTSIDE.. LIE IN A DITCH OR CULVERT AND STAY AWAY FROM TREES AND TELEPHONE POLES. SCHNEIDER
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, Jul 20, 1:45 PM CDT, 59 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE LA CROSSE WI 145 PM CDT MON JUL 20 1987 ...VERY INTENSE THUNDERSTORMS DEVELOPING IN WEST CENTRAL WISCONSIN... A WEAK FRONTAL BOUNDARY ACROSS CENTRAL MINNESOTA AND WISCONSIN HAS BEEN KEEPING SOMEWHAT COOLER AIR TO THE NORTH AND WARM MOIST AIR TO THE SOUTH. THIS HAS SET UP A VERY UNSTABLE WEATHER PATTERN OVER THE TWO STATES AND THIS MORNING THE THUNDERSTORMS WERE SET OFF. VERY INTENSE THUNDERSTORMS HAVE BEEN MOVING EAST TO SOUTHEASTWARD THROUGH THE NORTHERN THIRD OF MINNESOTA AND WISCONSIN THROUGHOUT THE MORNING AND EARLY AFTERNOON HOURS. THE INTENSE THUNDERSTORMS ARE EXPECTED TO CONTINUE TO MOVE EAST SOUTHEASTWARD AT 40 MILES AN HOUR THIS AFTERNOON. THE THUNDERSTORMS SHOULD MOVE INTO NORTHERN BUFFALO COUNTY BY 200 PM AND NORTHERN PORTIONS OF TEMPEALEAU AND JACKSON COUNTIES OF WEST CENTRAL WISCONSIN BY 230 PM CDT. THESE INTENSE THUNDERSTORMS HAVE BEEN PRODUCING WINDS GUSTS BETWEEN 50 TO 60 MILES AN HOUR AND HEAVY DOWNPOURS. PERSONS IN PORTIONS OF WEST CENTRAL WISCONSIN SHOULD ALSO BE ALERT FOR POSSIBLE HAIL..LIGHTNING AND EVEN A TORNADO WITH THESE VERY STRONG STORMS. THE NATIONAL WEATHER SERVICE WILL BE CLOSELY MONITORING THESE STORMS FOR THE NEXT FEW HOURS. STAY TUNED TO RADIO..TELEVISION..OR WEATHER RADIO FOR THE LATEST INFORMATION. SCHNEIDER
The office that day
Everything else NWS La Crosse, WI issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 20, 2:28 PM CDT | Severe Thunderstorm Warning | ARX | Buffalo, Trempealeau | 57 min |
Nearby
Severe Thunderstorm Warnings in Wisconsin, 1987Every severe thunderstorm warning in 1987
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.