Alert archive / Wisconsin / Severe Thunderstorm Warnings in 1999

Severe Thunderstorm Warning 21, NWS Milwaukee, WI

May 16, 1999Iowa County, Wisconsin

NWS Milwaukee, WI issued this severe thunderstorm warning at May 16, 1999, 9:20 PM CDT for Iowa County, Wisconsin. It was in force for 60 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
May 16, 1999, 9:20 PM CDT (02:20 UTC)
Expired
May 16, 1999, 10:20 PM CDT
In force
60 min
Issued by
NWS Milwaukee, WI
Area
Whole counties

County Iowa County, WI

The radar

The La Crosse radar (KARX), 125 km from the middle of the area, began a volume at 02:23 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

What was reported inside it

TimeReportWhereRemark
May 16, 10:00 PM CDTThunderstorm WindDodgeville, 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.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

IssuedProductOfficeLasted
May 16, 4:45 PM CDTSevere Thunderstorm WatchSPC6 hr

The nearest sounding before it

Davenport, (KDVN), launched 00:00Z, 2.3 hours before the alert went out and 156 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, Davenport, at 00:00Z on 1999-05-17Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 3009 joules per kilogram.LCLEL10008507005003002001001 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, Davenport, at 00:00Z on 1999-05-17The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 61 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
3009 J/kg
Mixed-layer CIN
-2 J/kg
Mixed-layer LCL
1174 m above ground
0-6 km bulk shear
33 kt
0-1 km storm-relative helicity
61 m²/s²
0-3 km storm-relative helicity
102 m²/s²
Significant tornado parameter
0.7
Supercell composite
5.9

Open this sounding in Storm Lab

The text

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

999 
WUUS1 KMKE 170222 RRA
SVRMKE
WIC049-170320-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MILWAUKEE/SULLIVAN WI
920 PM CDT SUN MAY 16 1999

THE NATIONAL WEATHER SERVICE IN MILWAUKEE/SULLIVAN HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  IOWA COUNTY IN SOUTH CENTRAL WISCONSIN

* UNTIL 1020 PM CDT

* AT 920 PM...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM OVER LAFAYETTE AND GRANT COUNTIES IN THE
  DICKEYVILLE...CUBA CITY AND HAZEL GREEN AREAS MOVING NORTHEAST AT
  20 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...MINERAL POINT...DODGEVILLE
  AND REWEY THROUGH 10 PM.

DAMAGING WINDS AND LARGE HAIL ARE LIKELY. TORRENTIAL RAINS ARE ALSO
LIKELY.  YOU SHOULD MOVE INSIDE A STURDY BUILDING AND STAY AWAY
FROM WINDOWS

JH/SD

The office that day

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

IssuedProductOfficeCountiesLasted
May 16, 7:37 PM CDTSevere Thunderstorm WarningMKXKenosha63 min
May 16, 9:15 PM CDTSevere Thunderstorm WarningMKXLafayette60 min
May 16, 10:10 PM CDTFlash Flood WarningMKXIowa, Lafayette3 hr
May 16, 10:10 PM CDTFlash Flood WarningMKXSauk3 hr
May 16, 10:17 PM CDTSevere Thunderstorm WarningMKXGreen, Lafayette58 min
May 16, 10:43 PM CDTFlash Flood WarningMKXColumbia, Marquette3 hr
May 16, 11:06 PM CDTSevere Thunderstorm WarningMKXDane59 min
May 16, 11:23 PM CDTFlash Flood WarningMKXGreen3 hr
May 17, 12:30 AM CDTSevere Thunderstorm WarningMKXRock60 min
May 17, 1:24 AM CDTSevere Thunderstorm WarningMKXWalworth61 min
May 17, 1:30 AM CDTSevere Thunderstorm WarningMKXKenosha, Racine60 min
May 17, 4:10 AM CDTFlash Flood WarningMKXGreen, Lafayette14 hr

Nearby

Severe Thunderstorm Warnings in Wisconsin, 1999Every severe thunderstorm warning in 1999

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; radar from the NEXRAD Level II archive.