Alert archive / Wisconsin / Severe Thunderstorm Warnings in 1997

Severe Thunderstorm Warning 33, NWS Green Bay, WI

July 2, 1997Marathon County, Wisconsin

NWS Green Bay, WI issued this severe thunderstorm warning at Jul 2, 1997, 1:48 AM CDT for Marathon County, Wisconsin. It was in force for 72 min. 4 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, 1:48 AM CDT (06:48 UTC)
Expired: Jul 2, 1997, 3:00 AM CDT
In force: 72 min
Issued by: NWS Green Bay, WI
Area: Whole counties

County Marathon County, WI

The radar

The Green Bay radar (KGRB), 138 km from the middle of the area, began a volume at 06:50 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, 1:55 AM CDT	Hail 1.75	Bevent, WI
Jul 2, 2:01 AM CDT	Hail 0.88	Bevent, WI
Jul 2, 2:15 AM CDT	Hail 0.88	Hatley, WI
Jul 2, 2:27 AM CDT	Thunderstorm Wind	Rothschild, 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, 6.8 hours before the alert went out and 139 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 020650 RRA
SVRGRB
WIC073-020800-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE GREEN BAY WI
148 AM CDT WED JUL 2 1997

* SEVERE THUNDERSTORM WARNING FOR
  MARATHON COUNTY - CENTRAL WISCONSIN

* UNTIL 300 AM CDT
 
* SOME LOCATIONS AFFECTED
  ALL OF MARATHON COUNTY

* AT 145 AM NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED SEVERE
  THUNDERSTORMS ENTERING WESTERN MARATHON COUNTY NEAR ABBOTSFORD.
  ANOTHER SEVERE STORM WAS 5 MILES NORTHEAST OF MOSINEE. THE STORMS
  WERE MOVING EAST AT 35 MPH.

* THE STORMS WILL AFFECT THE COUNTY THROUGH 300 AM.  BEVENT AND
  SHANTYTOWN IN PARTICULAR CAN EXPECT LARGE HAIL AND DAMAGING WINDS.

MOVE TO A STURDY SHELTER.

SEVERE THUNDERSTORMS CAN PRODUCE TORNADOES WITH LITTLE WARNING.
STAY TUNED TO NOAA WEATHER RADIO FOR ADDITIONAL WEATHER INFORMATION.

JKL/JS

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.

NWS Green Bay, WI wrote its last area forecast discussion before this severe thunderstorm warning went out at Jul 1, 8:00 PM CDT, 5 hours 48 minutes earlier.

Area forecast discussion, Jul 1, 8:00 PM CDT, 5 hours 48 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE GREEN BAY WI
755 PM CDT TUE JUL 1 1997

THUS FAR...CAP ACRS IA HAS REMAINED STG ENOUGH TO INHIBIT DEEP
CONVECTION S OF THE MN BORDER. COMPLEX OF TSTMS N OF THE CAP ACRS
CEN MN HAS INTENSIFIED AND APPEARS TO BE PRODUCING WIDESPREAD SVR
WX. 21Z RUC SHOWED THE STRONGEST TSTMS NEAR THE NOSE OF >30 KT
LLJ. RUC PROGS THIS JET TO SHIFT SLOWLY EAST THIS EVENING...WITH NOSE
OF JET ENTERING NW WI ARND 06Z. ALTHOUGH THE AIR OVER WI IS NOT AS
UNSTABLE AS TO THE WEST...GIVEN THE STRENGTH OF THE DYNAMICS...STORMS
SHOULD REMAIN SVR AS THEY MOVE INTO WI. CURRENT MVMT OF THESE TSTMS
WOULD BRING THEM INTO THE NW PART OF MY FCST AREA ARND 05Z.

TSTMS THAT STARTED TO DEVELOP OVER SE MN APPEAR TO BE INHIBITED BY
BY CAP. THIS WILL LIKELY DELAY THE ONSET OF TSTMS IN THE S/SW
PART OF MY FCST AREA UNTIL AFT 05Z.

JS

In the hours before

Local storm report, Jul 2, 12:24 AM CDT, 1 hour 24 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE GREEN BAY WI
1224 AM CDT WED JUL 2 1997

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

1220 AM    SPENCER                   WI   .88 INCH HAIL
07/02/97   MARATHON

PLH

Local storm report, Jul 2, 12:30 AM CDT, 1 hour 18 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE GREEN BAY WI
1230 AM CDT WED JUL 2 1997

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

1226 AM    SPENCER                   WI   1.75 INCH HAIL
07/02/97   MARATHON

PLH

Local storm report, Jul 2, 12:40 AM CDT, 1 hour 8 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE GREEN BAY WI
1240 AM CDT WED JUL 2 1997

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

1235 AM    BAKERVILLE                WI   60 MPH WIND GUST
07/02/97   WOOD

1237 AM    SPENCER                   WI   90 MPH WIND GUST
07/02/97   MARATHON

PLH

Local storm report, Jul 2, 12:41 AM CDT, 1 hour 7 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE GREEN BAY WI
1240 AM CDT WED JUL 2 1997

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

1235 AM    BAKERVILLE                WI   60 MPH WIND GUST
07/02/97   WOOD

1237 AM    SPENCER                   WI   90 MPH WIND GUST
07/02/97   MARATHON

PLH

Local storm report, Jul 2, 12:45 AM CDT, 1 hour 3 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE GREEN BAY WI
1245 AM CDT WED JUL 2 1997

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

1240 AM    1 S UNITY                 WI   1.75 INCH HAIL
07/02/97   MARATHON

PLH

Local storm report, Jul 2, 1:04 AM CDT, 44 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE GREEN BAY WI
104 AM CDT WED JUL 2 1997

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

1245 AM    MARSHFIELD                WI   60 MPH WIND GUST
07/02/97   WOOD

1255 AM    SPENCER                   WI   WIND DAMAGE
07/02/97   MARATHON                       TREES/POWER LINES DOWN

0100 AM    STRATFORD                 WI   .75 INCH HAIL
07/02/97   MARATHON

PLH

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, 12:31 AM CDT	Tornado Warning	GRB	Marathon, Wood	44 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, 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

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.