Alert archive / Wisconsin / Tornado Warnings in 1997

Tornado Warning 1, NWS Green Bay, WI

July 2, 1997Marathon County, Wood County, Wisconsin

NWS Green Bay, WI issued this tornado warning at Jul 2, 1997, 12:31 AM CDT for Marathon County, Wood County, Wisconsin. It was in force for 44 min. 6 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: Jul 2, 1997, 12:31 AM CDT (05:31 UTC)
Expired: Jul 2, 1997, 1:15 AM CDT
In force: 44 min
Issued by: NWS Green Bay, WI
Area: Whole counties

Counties Marathon County, WI, Wood County, WI

The radar

The La Crosse radar (KARX), 140 km from the middle of the area, began a volume at 05:30 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 2, 12:35 AM CDT	Thunderstorm Wind 65	Bakerville, WI
Jul 2, 12:37 AM CDT	Thunderstorm Wind 70	Spencer, WI
Jul 2, 12:40 AM CDT	Hail 1.75	Abbotsford, WI
Jul 2, 12:45 AM CDT	Thunderstorm Wind 52	Marshfield, WI
Jul 2, 1:00 AM CDT	Hail 0.75	Stratford, WI
Jul 2, 1:20 AM CDT	Hail 0.75	Auburndale, 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 1, 10:30 PM CDT	Tornado Watch	SPC	6 hr

The nearest sounding before it

Green Bay/Straub, WI (KGRB), launched 00:00Z, 5.5 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-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: 603 J/kg
Mixed-layer CIN: -65 J/kg
Mixed-layer LCL: 774 m above ground
0-6 km bulk shear: 46 kt
0-1 km storm-relative helicity: 29 m²/s²
0-3 km storm-relative helicity: 58 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 0.4

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KGRB 020532 RRA
TORGRB
WIC073-141-020615-

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE GREEN BAY WI
1231 AM CDT WED JUL 2 1997

* TORNADO WARNING FOR
  SOUTHWESTERN MARATHON COUNTY - CENTRAL WISCONSIN
  NORTHERN WOOD COUNTY - CENTRAL WISCONSIN

* UNTIL 115 AM CDT
 
* SOME LOCATIONS AFFECTED
  MARSHFIELD
  ROSEVILLE

* AT 1230 AM NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  DEVELOPING TORNADO 10 MILES NORTHWEST OF MARSHFIELD. THE STORM
  WAS MOVING EAST AT 25 MPH.

* THE STORM WILL BE ALONG THE MARATHON-WOOD COUNTY LINE THROUGH
  115 AM.

IF YOU ARE NEAR THIS DANGEROUS STORM...TAKE COVER IMMEDIATELY IN
THE LOWEST FLOOR AND INNER MOST ROOM OF A BUILDING.  LARGE HAIL
WILL ALSO OCCUR WITH THIS STORM.

JKL/JS/TSK

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 1, 11:32 PM CDT	Severe Thunderstorm Warning	GRB	Marathon	63 min
Jul 2, 12:20 AM CDT	Severe Thunderstorm Warning	GRB	Wood	65 min
Jul 2, 12:35 AM CDT	Severe Thunderstorm Warning	GRB	Marathon	80 min
Jul 2, 12:57 AM CDT	Severe Thunderstorm Warning	GRB	Portage	63 min
Jul 2, 1:41 AM CDT	Severe Thunderstorm Warning	GRB	Wood	64 min
Jul 2, 1:48 AM CDT	Severe Thunderstorm Warning	GRB	Marathon	72 min
Jul 2, 2:01 AM CDT	Severe Thunderstorm Warning	GRB	Portage, Shawano, Waupaca	74 min
Jul 2, 4:04 AM CDT	Severe Thunderstorm Warning	GRB	Waupaca	61 min

Nearby

Tornado Warnings in Wisconsin, 1997 Every tornado warning in 1997 Tornadoes 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.