Alert archive / Wisconsin / Severe Thunderstorm Warnings in 1991
Severe Thunderstorm Warning 39, NWS Milwaukee, WI
NWS Milwaukee, WI issued this severe thunderstorm warning at Sep 9, 1991, 8:11 PM CDT for Walworth County, Wisconsin. It was in force for 44 min. 1 report 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, 8:11 PM CDT (01:11 UTC)
- Expired
- Sep 9, 1991, 8:55 PM CDT
- In force
- 44 min
- Issued by
- NWS Milwaukee, WI
- Area
- Whole counties
County Walworth County, WI
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Sep 9, 8:23 PM CDT | Thunderstorm Wind 56 | Walworth, 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 00:00Z, 1.2 hours before the alert went out and 204 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
- 2788 J/kg
- Mixed-layer CIN
- -6 J/kg
- Mixed-layer LCL
- 1100 m above ground
- 0-6 km bulk shear
- 15 kt
- 0-1 km storm-relative helicity
- 52 m²/s²
- 0-3 km storm-relative helicity
- 77 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 KMKE 100114 SVRMKE WIC127-100200- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE MILWAUKEE/SULLIVAN WI 811 PM CDT MON SEP 9 1991 THE NATIONAL WEATHER SERVICE IN MILWAUKEE/SULLIVAN HAS ISSUED A SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 900 PM CDT FOR PEOPLE IN THE FOLLOWING LOCATION... IN SOUTHEAST WISCONSIN ...WALWORTH COUNTY AT 810 PM RADAR SHOWED A CLUSTER OF SEVERE THUNDERSTORMS FROM ELKHORN TO WALWORTH...OR 40 MILES SOUTHWEST OF MILWAUKEE. THE STORMS ARE MOVING EAST TO NORTHEAST AT 30 MILES AN HOUR AND WILL BE AFFECTING THE TOWNS OF EAST TROY...LAKE GENEVA AND WILLIAMS BAY. WHEN THUNDERSTORMS ARE OCCURRING...PEOPLE SHOULD MOVE INSIDE A 'STRONG BUILDING. DO NOT STAND BY WINDOWS. DON'T USE TELEPHONES OR ELECTRICAL APPLIANCES UNLESS IN AN EMERGENCY UNTIL THE STORM HAS PASSED. MOTORISTS SHOULD NOT DRIVE INTO LOW WATER CROSSINGS. TH
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, 5:59 PM CDT, 2 hours 12 minutes before
WIZ017-020-092310- SPECIAL WEATHER AND MARINE STATEMENT NATIONAL WEATHER SERVICE MILWAUKEE/SULLIVAN WI 558 PM CDT MON SEP 9 1991 AT 549 PM CDT HAM RADIO OBSERVERS REPORT 3/4 INCH HAIL IN WHITEFISH BAY...5 MILES NORTH OF MILWAUKEE AND 1/2 INCH HAIL AT WEST ALLIS...5 MILES WEST SOUTHWEST OF MILWAUKEE. IN ADDITION HAIL OF 1/2 TO 3/4 INCH DIAMETER WAS REPORTED IN MILWAUKEE AT 60TH AND OKLAHOMA...AS WELL AS SEVERAL OTHER LOCATIONS. THE INTENSE THUNDERSTORM PRODUCING THE HAIL IS MOVING INTO THE EASTERN PORTIONS OF MILWAUKEE COUNTY AND WILL BE MOVING INTO LAKE MICHIGAN BUR THE NEXT HALF HOUR. PERSONS IN THE EASTERN PORTIONS OF MILWAUKEE COUNTY SHOULD BE ALERT FOR THS STORM. BOATERS IN LAKE MICHIGAN SHOULD ALREADY BE IN SAFE HARBOR. ZAJDEL
Special weather statement, Sep 9, 6:07 PM CDT, 2 hours 4 minutes before
WIZ004-007-100000- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE MILWAUKEE/SULLIVAN WI 607 PM CDT MON SEP 9 1991 ...SCATTERED INTENSE THUNDERSTORMS OVER NORTH CENTAL WISCONSIN... AT 607 PM CDT...WEATHER RADAR INDICATED SCATTERED INTENSE THUNDERSTORMS OVER MARATHON...WOOD...AND PORTAGE COUNTIES OF NORTH CENTRAL WISCONSIN. THE HEAVIEST STORMS WERE IN WOOD COUNTY WHERE 50 MPH WINDS WERE REPORTED WITH SOME STORMS. THESE STORMS WERE MOVING IN AN EASTERLY DIRECTION AT AROUND 30 MPH...AND WILL CONTINUE TO AFFECT NORTH CENTRAL WISCONSIN UNTIL 7 PM. THESE STORMS HAVE A HISTORY OF PRODUCING SMALL HAIL...STRONG WINDS... VERY HEAVY RAINS...AND DANGEROUS LIGHTNING. PERSONS IN NORTH CENTRAL W ISCONSIN ARE ADVISED TO STAY ALERT FOR THREATNING WEATHER AND BE PREPARED TO SEEK SHELTER. A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 10 PM. KOCHIS
Special weather statement, Sep 9, 6:48 PM CDT, 1 hour 23 minutes before
WIZ010-011-014-015-018-019-100100- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE MADISON WI 645PM CDT MON SEP 9 1991 ...SEVERE THUNDERSTORMS WATCH IN EFFECT UNTIL 10PM CDT... AT 640PM CDT RADAR INDICATED A SHORT LINE OF THUNDERSTORMS FROM 10 MILES NORTH OF RACINE TO THE NORTHERN CITY LIMIT OF MILWAUKEE. THESE STORMS WERE MOVING TOWARDS THE EAST AT 30 MPH AND SHOULD BE OVER LAKE MICHIGAN BY 715PM THIS EVENING. ANOTHER LINE OF STORMS AND SHOWERS HAVE MOVED ACROSS THE MISSISSIPPI RIVER VALLEY FROM IOWA AND STRETCHED FROM PRAIRIE DU CHEN TO HILLSBORO.. OR 15 MILES SOUTHWEST OF MAUSTON. THIS LINE WAS MOVING TOWARDS THE EAST AT 30 MPH AND COULD INTENSIFY WITHIN THE NEXT HOUR...BY 730PM. SOME CITIES WITHIN THE PATH OF THIS LINE ARE MAUSTON..RICHLAND CENTER.. MUSCODO..AND LANCASTER. SHOULD ANY STORM THREATEN YOU SEEK IMMEDIATE SHELTER.
Special weather statement, Sep 9, 7:43 PM CDT, 28 minutes before
WIZ010-011-014-015-018-019-100200- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE MADISON WI 735PM CDT MON SEP 9 1991 ...SEVER THUNDERSTORM WATCH IN EFFECT UNTIL 10PM CDT... AT 733PM CDT RADAR INDICATED A SMALL GROUP OF SHOWERS AND THUNDERSHOWERS STRETCHING FROM 10 MILES SOUTHEAST TO RICHLAND CENTER TO SAUK CITY...OR 10 MILES NORTHWEST OF MADISON. THEY WERE MOVING TOWARDS THE EAST AT 30 TO 35 MPH. CITIES IN THEIR PATH ARE SAUK CITY...LODI..f.DANE...AND POYNETTE. OTHER SCATTERED SHOWERS WERE MOVING ACROSS THE MISSISSIPPI RIVER BETWEEN PRAIRIE DU CHEN AND LACROSSE. NO SEVERE WEATHER HAS BEEN REPORTED WITH ANY OF THESE AREAS. STIMACH
Special weather statement, Sep 9, 7:56 PM CDT, 15 minutes before
WIZ013-017-100130- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE MILWAUKEE/SULLIVAN WI 755 PM CDT MON SEP 9 1991 ...INTENSE THUNDERSTORMS RAPIDLY DEVELOPING OVER SHEBOYGAN AND OZAUKEE COUNTIES... AT 750 PM CDT...WEATHER RADAR INDICATED A CLUSTER OF RAPIDLY DEVELOPING INTENSE THUNDERSTORMS OVER SHEBOYGAN AND OZAUKEE COUNTIES. THE STRONGEST STORMS WERE BETWEEN PLYMOUTH AND RANDOM LAKE IN SHEBOYGAN COUNTY...ABOUT 13 MILES SOUTHWEST OF SHEBOYGAN. ANOTHER STRONG STORM WAS LOCATED IN OZAUKEE COUNTY BETWEEN PORT WASHINGTON AND GRAFTON...ABOUT 24 MILES NORTH OF MILWAUKEE. THE STORMS ARE MOVING NORTHEAST AT 30 MPH. THUS FAR THESE STORMS HAVE PRODUCED FREQUENT LIGHTNING BUT MAY BE CAPABLE OF STRONG WINDS...SMALL HAIL AND VERY HEAVY RAINS. PERSONS IN THESE COUNTIES AND ON THE ADJACENT WATERS OF LAKE MICHIGAN ARE ADVISED TO STAY ALERT FOR THREATENING WEATHER ASSOCIATED WITH THESE STORMS. ZAJDEL
Special weather statement, Sep 9, 8:06 PM CDT, 5 minutes before
WIZ019-020-100140- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE MILWAUKEE/SULLIVAN WI 802 PM CDT MON SEP 9 1991 ...INTENSE THUNDERSTORMS RAPIDLY DEVELOPING OVER WALWORTH COUNTY... AT 800 PM CDT...WEATHER RADAR INDICATED A CLUSTER OF RAPIDLY DEVELOPING INTENSE THUNDERSTORMS OVER WALWORTH COUNTY. THE STRONGEST STORMS WERE BETWEEN ELKHORN AND JANESVILLE OR ABOUT 45 MILES SOUTHWEST OF MILWAUKEE. THE STORM WAS MOVING EAST NORTHEAST AROUND 30 MPH AND WILL BE HEADING TOWARD THE TOWNS OF EAST TROY AND LAKE GENEVA BY 815 PM AND THEN ON INTO WESTERN KENOSHA AND WESTERN RACINE COUNTIES. THESE STORMS MAY PRODUCE FREQUENT LIGHTNING...STRONG WINDS...SMALL HAIL AND VERY HEAVY RAINS. PERSONS IN THESE WALWORTH...RACINE AND KENSOHA COUNTIES ARE ADVISED TO STAY ALERT FOR THREATENING WEATHER ASSOCAIATED WITH THESE STORMS. ZAJDEL
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.