Alert archive / Wisconsin / Severe Thunderstorm Warnings in 1987
Severe Thunderstorm Warning 2, NWS Green Bay, WI
NWS Green Bay, WI issued this severe thunderstorm warning at May 21, 1987, 6:06 PM CDT for Dane County, Wisconsin. It was in force for 24 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
- May 21, 1987, 6:06 PM CDT (23:06 UTC)
- Expired
- May 21, 1987, 6:30 PM CDT
- In force
- 24 min
- Issued by
- NWS Green Bay, WI
- Area
- Whole counties
County Dane County, WI
The radar
The WSR-88D network and its archive begin in 1991, so there is no radar volume for this alert.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| May 21, 6:10 PM CDT | Hail 1.75 | Dane, 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, 11.1 hours before the alert went out and 189 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 949 m above ground
- 0-6 km bulk shear
- 33 kt
- 0-1 km storm-relative helicity
- 58 m²/s²
- 0-3 km storm-relative helicity
- 105 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 KMSN 212306 SVRMSN WIC025-212330- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE MADISON WI 606 PM CDT THU MAY 21 1987 THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 630 PM CDT FOR PEOPLE IN THE FOLLOWING COUNTY OF SOUTH CENTRAL WISCONSIN...SOUTHEAST DANE AT 600PM CDT RADAR INDICATED A SEVERE THUNDERSTORM 20 MILES SOUTH OF MAIDSON MOVING TOWARDS THE NORTHEAST AT 404 MPH. SEVERE THUNDERSTORMS PRODUCE DAMAGING WINDS..LARGE HAIL AND DANGEROUS LIGHTNING. IF THREATENING WEATHER APPROACHES TAKE SHELTER. STIMACH
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, May 21, 2:22 PM CDT, 3 hours 44 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE GREEN BAY WI 215 PM CDT THU MAY 21 1987 ...THUNDERSTORMS DEVELOPING RAPIDLY OVER NORTHEAST WISCONSIN... AT 2PM THE WEATHER SERVICE RADAR INDICATED A LINE OF STRONG THUNDERSTORMS OVER WESTERN MARINETTE COUNTY SOUTH THRU CENTRAL OCONTO COUNTY...WESTERN SHAWANO COUNTY AND INTO NORTHCENTRAL OUTAGAMIE COUNTY. MOVEMENT OF THIS LINE APPEARS TO BE TO THE EAST. STRONG WINDS...DANGEROUS LIGHTNING...BRIMEF HEAVY RAINS AND HAIL ARE LIKELY WITH THE PASSAGE OF THESE THUNDERSTORMS. PERSONS ON AREA LAKES AND THE BAY OF GREEN BAY SHOULD SEEK SAFE HARBOR AND OTHER INTERESTS SHOULD LISTEN FOR LATER STATEMENTS AND POSSIBLE WARNINGS. PLH
Special weather statement, May 21, 3:19 PM CDT, 2 hours 47 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE GREEN BAY WI 315 PM CDT THU MAY 21 1987 ...STRONG THUNDERSTORMS CONTINUE OVER NORTHEAST WISCONSIN... AT 315PM CDT THE WEATHER SERVICE RADAR INDICATED STRONG THUNDERSTORMS OVER NORTHERN OCONTO COUNTY NORTHEAST OF MOUNTAIN EXTENDING NORTHEAST INTO CENTRAL AND NORTHERN MARINETTE COUNTY. ANOTHER STRONG THUNDERSTORM HAD DEVELOPED IN CENTRAL WAUPACA COUNTY NEAR MANAWA. THESE THUNDERSTORMS WERE MOVING TO THE NORTHEAST AT 30 MPH. THESE THUNDERSTORMS SHOULD PRODUCE SOME HAIL BRIEF HEAVY RAINS AND DANGEROUS LIGHTNING. PERSONS IN NORTHEAST WISCONSIN SHOULD BE ALERT FOR THREATNING WEATHER CONDITIONS AND BE PREPARED TO TAKE COVER IF NECESSARY. PLH
Special weather statement, May 21, 3:55 PM CDT, 2 hours 11 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE GREEN BAY WI 350 PM CDT THU MAY 21 1987 ...STRONG THUNDERSTORMS CONTINUE OVER NORTHEAST WISCONSIN... AT 345 PM CDT RADAR SHOWS A STRONG THUNDERSTORM JUST SOUTHEAST OF THE CITY OF SHAWANO IN SHAWANO COUNTY...30 MILES NORTHWEST OF GREEN BAY. THIS STORM IS MOVING NORTHEAST AT 30 MILES AN HOUR AND WILL AFFECT EASTERN SHAWANO AND SOUTHERN OCONTO COUNTY WITHIN THE NEXT HOUR. PERSONS IN THIS AREA SHOULD LISTEN TO LATER STATEMENTS. HELMAN
Special weather statement, May 21, 4:13 PM CDT, 1 hour 53 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE GREEN BAY WI 410 PM CDT THU MAY 21 1987 ...STRONG THUNDERSTORMS CONTINUE OVER NORTHEAST WISCONSIN... AT 400 PM CDT RADAR SHOWS SCATTERED THUNDERSTORMS THROUGHOUT NORTHEAST WISCONSIN. THE STRONG STORM IN WESTERN SHAWANO COUNTY HAS DECREASED IN INTENSITY. AT 345 PM CDT PEA SIZE HAIL WAS REPORTED BY A HAM OPERATOR IN THE CITY OF OSHKOSH...AT 400 PM CDT PEA SIZE HAIL WAS ALSO REPORTED BY A HAM OPERATOR IN THE CITY OF DEPERE...JUST SOUTH OF GREEN BAY. ALL THUNDERSTORMS IN NORTHEAST WISCONSIN ARE MOVING NORTHEAST AT 30 MPH. PERSONS IN NORTHEAST WISCONSIN SHOULD LISTEN TO LATER STATEMENTS. HELMAN
The office that day
Everything else NWS Green Bay, WI issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 21, 6:48 PM CDT | Severe Thunderstorm Warning | GRB | Rock | 22 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.