Alert archive / Wisconsin / Severe Thunderstorm Warnings in 1987

Severe Thunderstorm Warning 29, NWS Green Bay, WI

July 20, 1987Door County, Kewaunee County, Wisconsin

NWS Green Bay, WI issued this severe thunderstorm warning at Jul 20, 1987, 1:28 PM CDT for Door County, Kewaunee County, Wisconsin. It was in force for 62 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: Jul 20, 1987, 1:28 PM CDT (18:28 UTC)
Expired: Jul 20, 1987, 2:30 PM CDT
In force: 62 min
Issued by: NWS Green Bay, WI
Area: Whole counties

Counties Door County, WI, Kewaunee 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, 2:10 PM CDT	Thunderstorm Wind 61	Door, 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, 6.5 hours before the alert went out and 56 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

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

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
TTAA00 KGRB 201828
SVRGRB
WIC029-061-201930-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM AND SPECIAL MARINE WARNING
NATIONAL WEATHER SERVICE GREEN BAY WI
128 PM CDT MON JUL 20 1987

THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM AND 
SPECIAL MARINE WARNING EFFECTIVE UNTIL 230 PM CDT FOR PEOPLE IN THE 
FOLLOWING COUNTIES OF

NORTHEAST WISCONSIN...SOUTHERN DOOR AND KEWAUNEE
...INCLUDING THE ADJACENT COASTAL WATERS OF                      
....LAKE MICHIGAN      

AT 120 PM CDT RADAR SHOWED A SEVERE THUNDERSTORM NEAR DYCKESVILLE...
ABOUT 15 MILES NORTHEAST OF THE CITY OF GREEN BAY AND MOVING TO THE
EAST SOUTHEAST AT 35 TO 40 MILES AN HOUR.
BOATERS ON LAKE MICHIGAN BETWEEN KEEWAUNEE AND STURGEON BAY SHOULD
SEEK A SAFE PORT AT ONCE.

IF THREATENING WEATHER APPROACHES YOU..BE ALERT FOR DAMAGING WINDS..
LARGE HAIL..AND DANGEROUS LIGHTNING. STAY TUNED TO NOAA WEATHER
RADIO...YOUR LOCAL RADIO OR TELEVISION FOR FURTHER INFORMATION.

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, 1:42 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
Jul 20, 5:06 PM CDT	Severe Thunderstorm Warning	GRB	Dane	54 min

Nearby

Severe Thunderstorm Warnings in Wisconsin, 1987 Every 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.