Alert archive / Wisconsin / Severe Thunderstorm Warnings in 2001

Severe Thunderstorm Warning 7, NWS Green Bay, WI

April 23, 2001Marathon County, Portage County, Wisconsin

NWS Green Bay, WI issued this severe thunderstorm warning at Apr 23, 2001, 11:53 AM CDT for Marathon County, Portage County, Wisconsin. It was in force for 52 min. 2 reports came from inside the area while it was in force.

The area

The outline the Iowa Environmental Mesonet reconstructed for it; the warning itself named whole counties, with what was reported inside it.

The facts

Issued: Apr 23, 2001, 11:53 AM CDT (16:53 UTC)
Expired: Apr 23, 2001, 12:45 PM CDT
In force: 52 min
Issued by: NWS Green Bay, WI
Area: Whole counties; the outline is the Mesonet’s reconstruction

Counties Marathon County, WI, Portage County, WI

The radar

The Green Bay radar (KGRB), 124 km from the middle of the area, began a volume at 16:55 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	Remark
Apr 23, 12:00 PM CDT	Thunderstorm Wind 50 E	Junction City, WI
Apr 23, 12:03 PM CDT	Thunderstorm Wind 52 E	Kelly, 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
Apr 23, 9:30 AM CDT	Tornado Watch	SPC	6 hr

The nearest sounding before it

Green Bay/Straub, WI (KGRB), launched 12:00Z, 4.9 hours before the alert went out and 125 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: 939 m above ground
0-6 km bulk shear: 66 kt
0-1 km storm-relative helicity: 114 m²/s²
0-3 km storm-relative helicity: 169 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.

946 
WUUS53 KGRB 231655 RRA
SVRGRB
WIC073-097-231745-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE GREEN BAY WI
1153 AM CDT MON APR 23 2001

THE NATIONAL WEATHER SERVICE IN GREEN BAY HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  EASTERN MARATHON COUNTY IN WISCONSIN
  NORTHWEST PORTAGE COUNTY IN WISCONSIN

* UNTIL 1245 PM CDT

* AT 1153 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR DETECTED A
  SEVERE THUNDERSTORM WITH STRONG WINDS AND HAIL. THE STORM WAS
  LOCATED 6 MILES SOUTHWEST OF JUNCTION CITY...OR 7 MILES NORTH OF
  WISCONSIN RAPIDS. IT WAS MOVING NORTHEAST AT 50 MPH.

* SOME LOCATIONS THAT WILL BE AFFECTED BY THE STORM INCLUDE...
  DANCY BY NOON CDT.
  KNOWLTON BY 1205 PM CDT.
  SUNSET BY 1225 PM CDT.
  HOGARTY BY 1230 PM CDT.

IF YOU ARE IN THE PATH OF THIS STORM...PREPARE FOR WINDS IN EXCESS OF
60 MPH...HAIL...AND DEADLY LIGHTNING. SEEK SHELTER IMMEDIATELY.

LAT...LON 4452 8981 4454 8956 4502 8925 4512 8974

TH

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 23, 11:35 AM CDT	Severe Thunderstorm Warning	GRB	Wood	40 min
Apr 23, 11:40 AM CDT	Severe Thunderstorm Warning	GRB	Lincoln	35 min
Apr 23, 12:14 PM CDT	Severe Thunderstorm Warning	GRB	Oneida	31 min
Apr 23, 12:34 PM CDT	Severe Thunderstorm Warning	GRB	Langlade	41 min
Apr 23, 12:40 PM CDT	Severe Thunderstorm Warning	GRB	Winnebago	50 min
Apr 23, 12:40 PM CDT	Severe Thunderstorm Warning	GRB	Vilas	35 min
Apr 23, 1:07 PM CDT	Severe Thunderstorm Warning	GRB	Outagamie	38 min
Apr 23, 1:32 PM CDT	Severe Thunderstorm Warning	GRB	Marinette, Oconto	58 min
Apr 23, 1:48 PM CDT	Severe Thunderstorm Warning	GRB	Calumet, Outagamie, Winnebago	42 min
Apr 23, 1:55 PM CDT	Severe Thunderstorm Warning	GRB	Brown	35 min
Apr 23, 2:48 PM CDT	Tornado Warning	GRB	Door	27 min

Nearby

Severe Thunderstorm Warnings in Wisconsin, 2001 Every severe thunderstorm warning in 2001

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.