Alert archive / Wisconsin / Severe Thunderstorm Warnings in 2002

Severe Thunderstorm Warning 69, NWS Green Bay, WI

July 30, 2002Marathon County, Wisconsin

NWS Green Bay, WI issued this severe thunderstorm warning at Jul 30, 2002, 6:12 PM CDT for Marathon County, Wisconsin. It was in force for 63 min. 5 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Jul 30, 2002, 6:12 PM CDT (23:12 UTC)
Expired: Jul 30, 2002, 7:15 PM CDT
In force: 63 min
Issued by: NWS Green Bay, WI
Area: Counties, with a storm outline in the text

County Marathon County, WI

The radar

The La Crosse radar (KARX), 152 km from the middle of the area, began a volume at 23:14 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
Jul 30, 6:47 PM CDT	Thunderstorm Wind 61 E	Abbotsford, WI
Jul 30, 6:48 PM CDT	Thunderstorm Wind 60 E	Spencer, WI
Jul 30, 6:50 PM CDT	Thunderstorm Wind 61 E	Abbotsford, WI
Jul 30, 7:00 PM CDT	Thunderstorm Wind 50 E	Edgar, WI
Jul 30, 7:20 PM CDT	Thunderstorm Wind 61 E	Colby, 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
Jul 30, 5:35 PM CDT	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

Green Bay/Straub, WI (KGRB), launched 12:00Z, 11.2 hours before the alert went out and 190 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: 104 J/kg
Mixed-layer CIN: -191 J/kg
Mixed-layer LCL: 1055 m above ground
0-6 km bulk shear: 19 kt
0-1 km storm-relative helicity: 32 m²/s²
0-3 km storm-relative helicity: 123 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

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

117 
WUUS53 KGRB 302312
SVRGRB
WIC073-310015-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE GREEN BAY WI
612 PM CDT TUE JUL 30 2002

THE NATIONAL WEATHER SERVICE IN GREEN BAY HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  MARATHON COUNTY IN WISCONSIN

* UNTIL 715 PM CDT

* AT 612 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR DETECTED A
  SEVERE THUNDERSTORM WITH STRONG WINDS AND HAIL. THE STORM WAS
  LOCATED 20 MILES NORTHWEST OF COLBY. THAT PLACES IT 48 MILES WEST
  OF WAUSAU. IT WAS MOVING SOUTHEAST AT 30 MPH.

* SOME LOCATIONS THAT WILL BE AFFECTED BY THE STORM INCLUDE...
  MILAN BY 645 PM CDT.
  FENWOOD BY 710 PM CDT.

SEVERE THUNDERSTORMS CAN PRODUCE TORNADOES WITH LITTLE OR NO WARNING.
IF A TORNADO IS SPOTTED...MOVE TO A BASEMENT OR SMALL INTERIOR ROOM
ON THE LOWEST FLOOR OF YOUR BUILDING.

TORRENTIAL RAIN...WHICH MAY FLOOD LOW LYING AREAS SUCH AS DITCHES AND
UNDERPASSES...IS ALSO LIKELY. DO NOT DRIVE YOUR VEHICLE ON A FLOODED
ROADWAY.

LAT...LON 4524 9065 4509 9078 4470 9002 4499 8971

KURIMSKI

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 30, 6:24 PM CDT	Severe Thunderstorm Warning	GRB	Lincoln	66 min
Jul 30, 6:42 PM CDT	Tornado Warning	GRB	Marathon	63 min

Nearby

Severe Thunderstorm Warnings in Wisconsin, 2002 Every severe thunderstorm warning in 2002

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.