Alert archive / Wisconsin / Severe Thunderstorm Warnings in 1987

Severe Thunderstorm Warning 11, NWS Milwaukee, WI

May 21, 1987Walworth County, Wisconsin

NWS Milwaukee, WI issued this severe thunderstorm warning at May 21, 1987, 11:39 PM CDT for Walworth County, Wisconsin. It was in force for 36 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: May 21, 1987, 11:39 PM CDT (04:39 UTC)
Expired: May 22, 1987, 12:15 AM CDT
In force: 36 min
Issued by: NWS Milwaukee, WI
Area: Whole counties

County Walworth 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, 11:55 PM CDT	Hail 0.75	Walworth, WI
May 22, 12:05 AM CDT	Thunderstorm Wind 0	Walworth, 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 00:00Z, 4.7 hours before the alert went out and 204 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: 2886 J/kg
Mixed-layer CIN: -5 J/kg
Mixed-layer LCL: 1006 m above ground
0-6 km bulk shear: 22 kt
0-1 km storm-relative helicity: 122 m²/s²
0-3 km storm-relative helicity: 187 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 8.3

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.

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, 8:25 PM CDT, 3 hours 14 minutes before

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Special weather statement, May 21, 9:02 PM CDT, 2 hours 37 minutes before

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Special weather statement, May 21, 9:31 PM CDT, 2 hours 8 minutes before

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Special weather statement, May 21, 9:45 PM CDT, 1 hour 54 minutes before

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Local storm report, May 21, 11:03 PM CDT, 36 minutes before

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Special weather statement, May 21, 11:28 PM CDT, 11 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
May 21, 7:01 PM CDT	Severe Thunderstorm Warning	MKX	Dodge, Jefferson, Walworth	29 min
May 21, 7:13 PM CDT	Severe Thunderstorm Warning	MKX	Waukesha	62 min
May 21, 7:17 PM CDT	Tornado Warning	MKX	Jefferson	34 min
May 21, 7:40 PM CDT	Severe Thunderstorm Warning	MKX	Washington	40 min
May 21, 7:40 PM CDT	Severe Thunderstorm Warning	MKX	Ozaukee, Sheboygan	50 min
May 21, 7:40 PM CDT	Severe Thunderstorm Warning	MKX	Milwaukee	50 min
May 21, 8:13 PM CDT	Severe Thunderstorm Warning	MKX	Walworth, Waukesha	57 min
May 21, 11:57 PM CDT	Severe Thunderstorm Warning	MKX	Kenosha, Racine	48 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.