Alert archive / Wisconsin / Severe Thunderstorm Warnings in 1987
Severe Thunderstorm Warning 39, NWS Green Bay, WI
NWS Green Bay, WI issued this severe thunderstorm warning at Jul 20, 1987, 5:06 PM CDT for Dane County, Wisconsin. It was in force for 54 min. 2 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
- Jul 20, 1987, 5:06 PM CDT (22:06 UTC)
- Expired
- Jul 20, 1987, 6:00 PM CDT
- In force
- 54 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 |
|---|---|---|---|
| Jul 20, 5:44 PM CDT | Thunderstorm Wind 0 | Dane, WI | |
| Jul 20, 5:55 PM CDT | Thunderstorm Wind 0 | 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, 10.1 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
- 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 KMSN 202206 SVRMSN WIC025-202300- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE MADISON WI 506 PM CDT MON JUL 20 1987 THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 600 PM CDT FOR PEOPLE IN THE FOLLOWING COUNTY OF SOUTH CENTRAL WISCONSIN...DANE AT 5 PM CDT A LINE OF THUNDERSTORMS WAS NOTED FROM 10 MILES WEST OF WISCONSIN DELLS TO HARTFORD OR ABOUT 30 MILES NORTHWEST OF MADISON TO 25 MILES NORTHWEST OF MILWAUKEE. THIS LINE HAS CONTAINED VERY STRONG WINDS CAUSING DAMAGE. AT 555PM CDT WIND DAMAGE WAS REPORTED 7 MILES SOUTHEAST OF PORTAGE. SEVERE THUNDERSTORMS PRODUCE DAMAGING WINDS..LARGE HAIL AND DANGEROUS LIGHTNING. IF THREATENING WEATHER APPROACHES TAKE SHELTER. ADDISON
The office that day
Everything else NWS Green Bay, WI issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 20, 11:47 AM CDT | Severe Thunderstorm Warning | GRB | Outagamie | 58 min |
| Jul 20, 12:33 PM CDT | Severe Thunderstorm Warning | GRB | Brown | 57 min |
| Jul 20, 1:18 PM CDT | Severe Thunderstorm Warning | GRB | Menominee, Oconto, Shawano | 57 min |
| Jul 20, 1:28 PM CDT | Severe Thunderstorm Warning | GRB | Door, Kewaunee | 62 min |
| Jul 20, 1:42 PM CDT | Severe Thunderstorm Warning | GRB | Outagamie, Shawano, Waupaca | 58 min |
| Jul 20, 2:07 PM CDT | Tornado Warning | GRB | Brown, Outagamie | 53 min |
| Jul 20, 2:28 PM CDT | Severe Thunderstorm Warning | GRB | Calumet, Winnebago | 62 min |
| Jul 20, 2:28 PM CDT | Severe Thunderstorm Warning | GRB | Brown | 62 min |
| Jul 20, 2:41 PM CDT | Severe Thunderstorm Warning | GRB | Outagamie | 49 min |
| Jul 20, 2:41 PM CDT | Severe Thunderstorm Warning | GRB | Kewaunee, Manitowoc | 49 min |
| Jul 20, 3:44 PM CDT | Severe Thunderstorm Warning | GRB | Adams, Juneau | 56 min |
| Jul 20, 4:00 PM CDT | Severe Thunderstorm Warning | GRB | Shawano, Waupaca | 60 min |
| Jul 20, 4:21 PM CDT | Severe Thunderstorm Warning | GRB | Green Lake, Marquette | 54 min |
| Jul 20, 4:49 PM CDT | Severe Thunderstorm Warning | GRB | Columbia, Sauk | 41 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.