Alert archive / Wisconsin / Severe Thunderstorm Warnings in 1987

Severe Thunderstorm Warning 38, NWS Milwaukee, WI

July 12, 1987Washington County, Waukesha County, Wisconsin

NWS Milwaukee, WI issued this severe thunderstorm warning at Jul 12, 1987, 12:15 PM CDT for Washington County, Waukesha County, Wisconsin. It was in force for 25 min.

The area

The counties it named.

The facts

Issued
Jul 12, 1987, 12:15 PM CDT (17:15 UTC)
Expired
Jul 12, 1987, 12:40 PM CDT
In force
25 min
Issued by
NWS Milwaukee, WI
Area
Whole counties

Counties Washington County, WI, Waukesha County, WI

The radar

The WSR-88D network and its archive begin in 1991, so there is no radar volume for this alert.

The nearest sounding before it

Green Bay/Straub, WI (KGRB), launched 12:00Z, 5.3 hours before the alert went out and 144 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 1987-07-12Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 386 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 1987-07-12The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 52 square meters per square second.193958Sfc1 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
386 J/kg
Mixed-layer CIN
-94 J/kg
Mixed-layer LCL
622 m above ground
0-6 km bulk shear
40 kt
0-1 km storm-relative helicity
52 m²/s²
0-3 km storm-relative helicity
117 m²/s²
Significant tornado parameter
0.1
Supercell composite
1.6

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, Jul 12, 11:52 AM CDT, 23 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MILWAUKEE WI
1150AM CDT SUN JUL 12 1987

...SEVERE THUNDERSTORM WATCH FOR EXTREME EASTERN WISCONSIN TILL 7 PM...

A SEVERE THUNDERSTORM WATCH WAS ISSUED FOR THE EXTREME EASTERN PART
OF WISCOSNIN AND THE ADJACENT COASTAL WATERS OF LAKE MICHIGAN.  AT
1145 AM A LIME OF STRONG THUNDERSTORMS STRETCHED FROM 15 MILES EAST
OF GREEN BAY TO 10 MILES WEST OF WEST BEND IN WASHINGTON COUNTY TO
THE CITY OF WAUKESHA...THEN DOWN TO LAKE GENEVA IN WALWORTH COUNTY.

THIS LINE WAS MOVING EAST AT 25 MPH AND SHOULD BE IN THE CITY OF
MILWAUKEE BY 1230 PM.

HEAVY RAINS...STRONG WINDS...AND POSSIBLE HAIL CAN BE EXPECTED WITH
THESE STORMS.  IF THREATENING WEATHER APPROCHES YOU SHOULD SEEK
SHELTER IMMEDIATELY.

KLD

BRIEF HEAVY RAINS..DANGEROUS LIGHTNING..GUSTY WINDS TO 40 MILES AN
HOUR AND SMALL HAIL WILL ACCOMPANY THIS LINE OF STORMS. PERSONS AND
BOATERS IN THE PATH OF THIS LINE OF STORMS SHOULD BE PREOPARED FOR
RAPIDLY CHANGING WEATHER CONDITIONS.

MORRIS
Special weather statement, Jul 12, 11:54 AM CDT, 21 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MILWAUKEE WI
1150 AM CDT SUN JUL 12 1987

...SEVERE THUNDERSTORM WATCH FOR EXTREME EASTERN WISCONSIN TILL 7 PM...

A SEVERE THUNDERSTORM WATCH WAS ISSUED FOR THE EXTREME EASTERN PART
OF WISCONSIN AND THE ADJACENT COASTAL WATERS OF LAKE MICHIGAN.  AT
1145 AM A LINE OF STRONG THUNDERSTORMS STRETCHED FROM 15 MILES EAST
OF GREEN BAY TO 10 MILES WEST OF WEST BEND...IN WASHINGTON COUNTY TO
THE CITY OF WAUKESHA...THEN DOWN TO LAKE GENEVA IN WALWORTH COUNTY.

THIS LINE WAS MOVING EAST AT 25 MPH AND SHOULD BE IN THE CITY OF
MILWAUKEE BY 1230 PM.

HEAVY RAINS...STRONG WINDS...AND POSSIBLE HAIL CAN BE EXPECTED WITH
THESE STORMS.  IF THREATENING WEATTHER APPROCHES YOU SHOULD SEEK
SHELTER IMMEDIATELY.

KLD

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 11, 8:56 PM CDTSevere Thunderstorm WarningMKXPortage, Wood64 min
Jul 12, 12:15 PM CDTSevere Thunderstorm WarningMKXMilwaukee, Ozaukee, Sheboygan52 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; the sounding from the Mesonet's radiosonde archive.