Alert archive / Wisconsin / Severe Thunderstorm Warnings in 1997

Severe Thunderstorm Warning 40, NWS Milwaukee, WI

June 21, 1997Dane County, Jefferson County, Wisconsin

NWS Milwaukee, WI issued this severe thunderstorm warning at Jun 21, 1997, 4:53 AM CDT for Dane County, Jefferson County, Wisconsin. It was in force for 62 min. 3 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: Jun 21, 1997, 4:53 AM CDT (09:53 UTC)
Expired: Jun 21, 1997, 5:55 AM CDT
In force: 62 min
Issued by: NWS Milwaukee, WI
Area: Whole counties

Counties Dane County, WI, Jefferson County, WI

The radar

The Milwaukee radar (KMKX), 45 km from the middle of the area, began a volume at 09:54 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

Time	Report	Where
Jun 21, 5:05 AM CDT	Thunderstorm Wind	Stoughton, WI
Jun 21, 5:07 AM CDT	Thunderstorm Wind 58	Marshall, WI
Jun 21, 5:25 AM CDT	Thunderstorm Wind 56	Lake Mills, 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.

Issued	Product	Office	Lasted
Jun 21, 2:15 AM CDT	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

Green Bay/Straub, WI (KGRB), launched 00:00Z, 9.9 hours before the alert went out and 179 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: 3468 J/kg
Mixed-layer CIN: 0 J/kg
Mixed-layer LCL: 648 m above ground
0-6 km bulk shear: 38 kt
0-1 km storm-relative helicity: 94 m²/s²
0-3 km storm-relative helicity: 187 m²/s²
Significant tornado parameter: 1.6
Supercell composite: 9.1

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KMKE 210953 RRA
SVRMKE
WIC025-055-211055-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MILWAUKEE/SULLIVAN WI
453 AM CDT SAT JUN 21 1997

* SEVERE THUNDERSTORM WARNING FOR
  EASTERN DANE COUNTY - SOUTH CENTRAL WISCONSIN
  JEFFERSON COUNTY - SOUTHEASTERN WISCONSIN

* UNTIL 555 AM CDT
 
* SOME LOCATIONS AFFECTED
  SUN PRAIRIE, CAMBRIDGE, AND LAKE MILLS

* AT 5:10 AM NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM JUST EAST OF MADISON. THE STORM WAS MOVING
  EAST AT 25 MPH.

DO NOT STAND BY WINDOWS. DO NOT USE TELEPHONES OR ELECTRICAL
APPLIANCES UNLESS IN AN EMERGENCY UNTIL THE STORM HAS PASSED.

BROWNING

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

Local storm report, Jun 21, 3:36 AM CDT, 1 hour 17 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MILWAUKEE/SULLIVAN WI
336 AM CDT SAT JUN 21 1997

TIME(CDT)  .....CITY LOCATION.....STATE   ...EVENT/REMARKS...
           ....COUNTY LOCATION....

0315 AM    BENTON                    WI   WIND DAMAGE
06/21/97   LAFAYETTE                      TREE DOWN ACROSS HWY 11

GD

Local storm report, Jun 21, 3:37 AM CDT, 1 hour 16 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MILWAUKEE/SULLIVAN WI
336 AM CDT SAT JUN 21 1997

TIME(CDT)  .....CITY LOCATION.....STATE   ...EVENT/REMARKS...
           ....COUNTY LOCATION....
8
0315 AM    BENTON                    WI   WIND DAMAGE
06/21/97   LAFAYETTE                      TREE DOWN ACROSS HWY 11

GD

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 21, 2:32 AM CDT	Severe Thunderstorm Warning	MKX	Ozaukee, Sheboygan	48 min
Jun 21, 3:01 AM CDT	Flash Flood Warning	MKX	Milwaukee	119 min
Jun 21, 3:10 AM CDT	Severe Thunderstorm Warning	MKX	Iowa, Lafayette	65 min
Jun 21, 3:55 AM CDT	Severe Thunderstorm Warning	MKX	Dane, Green	55 min
Jun 21, 4:16 AM CDT	Flash Flood Warning	MKX	Dodge, Washington	119 min
Jun 21, 4:16 AM CDT	Flash Flood Warning	MKX	Ozaukee	119 min
Jun 21, 5:53 AM CDT	Severe Thunderstorm Warning	MKX	Lafayette	62 min
Jun 21, 6:55 AM CDT	Severe Thunderstorm Warning	MKX	Green	60 min
Jun 21, 7:32 AM CDT	Severe Thunderstorm Warning	MKX	Rock, Walworth	63 min
Jun 21, 7:40 AM CDT	Flash Flood Warning	MKX	Milwaukee, Waukesha	2 hr
Jun 21, 4:54 PM CDT	Flash Flood Warning	MKX	Waukesha	4 hr

Nearby

Severe Thunderstorm Warnings in Wisconsin, 1997 Every severe thunderstorm warning in 1997

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.