Alert archive / Wisconsin / Severe Thunderstorm Warnings in 1997

Severe Thunderstorm Warning 12, NWS Green Bay, WI

June 20, 1997Wood County, Wisconsin

NWS Green Bay, WI issued this severe thunderstorm warning at Jun 20, 1997, 1:28 AM CDT for Wood County, Wisconsin. It was in force for 57 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Jun 20, 1997, 1:28 AM CDT (06:28 UTC)
Expired: Jun 20, 1997, 2:25 AM CDT
In force: 57 min
Issued by: NWS Green Bay, WI
Area: Whole counties

County Wood County, WI

The radar

The La Crosse radar (KARX), 116 km from the middle of the area, began a volume at 06:28 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.

The nearest sounding before it

Green Bay/Straub, WI (KGRB), launched 00:00Z, 6.5 hours before the alert went out and 154 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 596 m above ground
0-6 km bulk shear: 47 kt
0-1 km storm-relative helicity: 151 m²/s²
0-3 km storm-relative helicity: 356 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.

262 
WUUS1 KGRB 200631 RRA
SVRGRB
WIC141-200725-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE GREEN BAY WI
128 AM CDT FRI JUN 20 1997

* SEVERE THUNDERSTORM WARNING FOR
  WOOD COUNTY - CENTRAL WISCONSIN

* UNTIL 225 AM CDT
 
* SOME LOCATIONS AFFECTED
  VESPER
  RUDOLPH

* AT 1:20 AM NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM 10 MILES NORTHWEST OF WISCONSIN RAPIDS. THE
  STORM WAS MOVING EAST AT 35 MILES AN HOUR..

* THE STORM WILL BE OVER VESPER AT 1:40 AM AND RUDOLPH BY 2:00 AM..

THIS IS A DANGEROUS STORM WITH HAIL LARGER THAN AN INCH IN
DIAMETER. MOVE TO A STURDY SHELTER.

RF/DI

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 Jun 19, 7:35 PM CDT, 5 hours 53 minutes earlier.

Area forecast discussion, Jun 19, 7:35 PM CDT, 5 hours 53 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE GREEN BAY WI
735 PM CDT THU JUN 19 1997

FORECAST PROBLEM FOR TONIGHT IS PRECIPITATION CHANCES ACROSS THE FA.

AT 00Z...SFC WARM FRONT ANALYZED FROM N OF MCW-S OF LSE-N OF MSN-JUST
W OF CHICAGO. 850 MB WARM FRONT STRETCHED FROM NEAR RHI-MNM-TVC AND WAS
RESPONSIBLE FOR A NARROW LINE OF SHRA/TSRA IN THAT AREA. THIS LINE WILL
CONTINUE TO DIMINISH AS THE NIGHT GOES ALONG.
  THE DEVELOPING MCS ACROSS PARTS OF NEB/S DAK THIS EVENING AND THE AREA
OF TSTORMS ACROSS NW MINN WILL LIKELY KEEP MOST OF THE ABUNDANT MOISTURE
AND BEST DYNAMICS OUT OF THE FA OVERNIGHT...SO WILL ADJUST PRECIP POPS
FROM LIKELY CATEGORY TO SMALL CHC POPS. WITH DEW POINTS IN THE 60S JUST
SOUTH OF THE FA AND WITH THE WARM FRONT DRAPED ACROSS SOUTHERN
WISCONSIN... CANNOT COMPLETELY RULE OUT THE CHANCE OF PRECIP OVERNIGHT
HOWEVER.
  WILL ALSO MAKE MENTION OF PATCHY FOG ACROSS THE FA FOR THE NIGHT. SOME
AREAS ACROSS THE EAST ALREADY REPORTING VSBYS OF 3 MILES OR LESS IN BR.

  UPDATED ZONES WILL BE ISSUED AROUND 8 PM.

COORDINATION WITH MKE...DLH AND LSE THIS EVENING.

ISAACSON

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 19, 11:15 PM CDT	Severe Thunderstorm Warning	GRB	Marathon	60 min
Jun 20, 1:52 AM CDT	Severe Thunderstorm Warning	GRB	Portage	28 min
Jun 20, 2:17 AM CDT	Severe Thunderstorm Warning	GRB	Outagamie	58 min
Jun 20, 3:01 AM CDT	Severe Thunderstorm Warning	GRB	Brown	59 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.