Alert archive / Wisconsin / Severe Thunderstorm Warnings in 1997

Severe Thunderstorm Warning 4, NWS Green Bay, WI

April 5, 1997Portage County, Shawano County, Waupaca County, Wisconsin

NWS Green Bay, WI issued this severe thunderstorm warning at Apr 5, 1997, 7:01 PM CST for Portage County, Shawano County, Waupaca County, Wisconsin. It was in force for 59 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
Apr 5, 1997, 7:01 PM CST (01:01 UTC)
Expired
Apr 5, 1997, 8:00 PM CST
In force
59 min
Issued by
NWS Green Bay, WI
Area
Whole counties

Counties Portage County, WI, Shawano County, WI, Waupaca County, WI

The radar

The Green Bay radar (KGRB), 77 km from the middle of the area, began a volume at 01:00 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, 1.0 hours before the alert went out and 78 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-pSkew-T log-p diagram, Green Bay/Straub, WI at 00:00Z on 1997-04-06Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Green Bay/Straub, WI at 00:00Z on 1997-04-06The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -24 square meters per square second.1939587897117Sfc1 km3 km6 km9 kmRMLM
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
492 m above ground
0-6 km bulk shear
32 kt
0-1 km storm-relative helicity
-24 m²/s²
0-3 km storm-relative helicity
-7 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.

000 
TTAA00 KGRB 060102 RRA
SVRGRB
WIC097-115-135-060200-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE GREEN BAY WI
701 PM CST SAT APR 5 1997

* SEVERE THUNDERSTORM WARNING FOR
  EASTERN PORTAGE COUNTY - CENTRAL WISCONSIN
  WESTERN SHAWANO COUNTY - NORTHEASTERN WISCONSIN
  NORTHWESTERN WAUPACA COUNTY - NORTHEASTERN WISCONSIN

* UNTIL 800 PM CST
 
* SOME LOCATIONS AFFECTED
  AMHERST
  ROSHOLT
  WITTENBERG
  BIG FALLS

* AT 658 PM NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A LINE
  OF SEVERE THUNDERSTORMS FROM NEAR JUNCTION CITY TO BANCROFT TO
  EAST OF PLAINFIELD. THE STORMS WERE MOVING NORTHEAST AT 50 MPH.

* THE STORMS WILL BE NEAR AMHERST BY 710 PM...BIG FALLS BY 725 PM
  AND NEAR WITTENBERG BY 735 PM.

THESE STORMS CONTAIN WINDS TO 60 MPH. MOVE TO A STURDY SHELTER.

DI/AK

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 5, 6:10 PM CSTSevere Thunderstorm WarningGRBPortage, Wood50 min
Apr 5, 6:35 PM CSTSevere Thunderstorm WarningGRBWaushara25 min
Apr 5, 6:51 PM CSTSevere Thunderstorm WarningGRBMarathon64 min

Nearby

Severe Thunderstorm Warnings in Wisconsin, 1997Every 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.