Alert archive / Wisconsin / Severe Thunderstorm Warnings in 1987

Severe Thunderstorm Warning 38, NWS Green Bay, WI

July 20, 1987Columbia County, Sauk County, Wisconsin

NWS Green Bay, WI issued this severe thunderstorm warning at Jul 20, 1987, 4:49 PM CDT for Columbia County, Sauk County, Wisconsin. It was in force for 41 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, 4:49 PM CDT (21:49 UTC)
Expired
Jul 20, 1987, 5:30 PM CDT
In force
41 min
Issued by
NWS Green Bay, WI
Area
Whole counties

Counties Columbia County, WI, Sauk 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

TimeReportWhereRemark
Jul 20, 5:02 PM CDTThunderstorm Wind 0Sauk, 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, 9.8 hours before the alert went out and 169 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-pSkew-T log-p diagram, Green Bay/Straub, WI at 12:00Z on 1987-07-20Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 3840 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Green Bay/Straub, WI at 12:00Z on 1987-07-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 20 square meters per square second.1939Sfc1 km3 km6 km9 kmRMLM
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

The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.

The office that day

Everything else NWS Green Bay, WI issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jul 20, 11:47 AM CDTSevere Thunderstorm WarningGRBOutagamie58 min
Jul 20, 12:33 PM CDTSevere Thunderstorm WarningGRBBrown57 min
Jul 20, 1:18 PM CDTSevere Thunderstorm WarningGRBMenominee, Oconto, Shawano57 min
Jul 20, 1:28 PM CDTSevere Thunderstorm WarningGRBDoor, Kewaunee62 min
Jul 20, 1:42 PM CDTSevere Thunderstorm WarningGRBOutagamie, Shawano, Waupaca58 min
Jul 20, 2:07 PM CDTTornado WarningGRBBrown, Outagamie53 min
Jul 20, 2:28 PM CDTSevere Thunderstorm WarningGRBCalumet, Winnebago62 min
Jul 20, 2:28 PM CDTSevere Thunderstorm WarningGRBBrown62 min
Jul 20, 2:41 PM CDTSevere Thunderstorm WarningGRBOutagamie49 min
Jul 20, 2:41 PM CDTSevere Thunderstorm WarningGRBKewaunee, Manitowoc49 min
Jul 20, 3:44 PM CDTSevere Thunderstorm WarningGRBAdams, Juneau56 min
Jul 20, 4:00 PM CDTSevere Thunderstorm WarningGRBShawano, Waupaca60 min
Jul 20, 4:21 PM CDTSevere Thunderstorm WarningGRBGreen Lake, Marquette54 min
Jul 20, 5:06 PM CDTSevere Thunderstorm WarningGRBDane54 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.