Alert archive / Wisconsin / Tornado Warnings in 1987

Tornado Warning 5, NWS Green Bay, WI

July 20, 1987Brown County, Outagamie County, Wisconsin

NWS Green Bay, WI issued this tornado warning at Jul 20, 1987, 2:07 PM CDT for Brown County, Outagamie County, Wisconsin. It was in force for 53 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, 2:07 PM CDT (19:07 UTC)
Expired: Jul 20, 1987, 3:00 PM CDT
In force: 53 min
Issued by: NWS Green Bay, WI
Area: Whole counties

Counties Brown County, WI, Outagamie 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, 2:15 PM CDT	Thunderstorm Wind 50	Outagamie, 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, 7.1 hours before the alert went out and 11 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 201907
TORGRB
WIC009-087-202000-

BULLETIN - IMMEDIATE BROADCAST REQUESTED/EBS ACTIVATION REQUESTED 
TORNADO WARNING
NATIONAL WEATHER SERVICE GREEN BAY WI
207 PM CDT MON JUL 20 1987

THE NATIONAL WEATHER SERVICE HAS ISSUED A TORNADO WARNING 
EFFECTIVE UNTIL 300 PM CDT FOR PEOPLE IN THE FOLLOWING COUNTIES OF

NORTHEAST WISCONSIN...NORTHERN BROWN AND OUTAGAMIE

REPORTS OF CONFIRMED FUNNEL CLOUDS HAVE BEEN RECEIVED ABOUT 25 MILES
WEST OF THE CITY OF GREEN BAY.  THIS STORM IS MOVING TO THE EAST AT
40 MILES AN HOUR.  THE CITIES INCLUDED IN THIS WARNING ARE GREEN
BAY AND DE PERE IN BROWN COUNTY...AND SEYMORE AND ONEIDA IN
OUTAGAMIE COUNTY.

THIS IS AN EXTREMELY DANGEROUS STORM.  PEOPLE IN THE PATH OF THIS
TORNADO SHOULD SEEK SHELTER IN A BASEMENT OR SMALL INTERIOR ROOM
ON THE LOWEST FLOOR. ABANDON CARS AND MOBILE HOMES FOR A REINFORCED
BUILDING.

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, 2:28 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

Tornado Warnings in Wisconsin, 1987 Every tornado warning in 1987 Tornadoes 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.