Alert archive / Wisconsin / Severe Thunderstorm Warnings in 2001

Severe Thunderstorm Warning 4, NWS Green Bay, WI

April 12, 2001Outagamie County, Waupaca County, Winnebago County, Wisconsin

NWS Green Bay, WI issued this severe thunderstorm warning at Apr 12, 2001, 3:57 AM CDT for Outagamie County, Waupaca County, Winnebago County, Wisconsin. It was in force for 48 min. 3 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 12, 2001, 3:57 AM CDT (08:57 UTC)
Expired: Apr 12, 2001, 4:45 AM CDT
In force: 48 min
Issued by: NWS Green Bay, WI
Area: Whole counties; the outline is the Mesonet’s reconstruction

Counties Outagamie County, WI, Waupaca County, WI, Winnebago County, WI

What was reported inside it

Time	Report	Where
Apr 12, 4:00 AM CDT	Thunderstorm Wind 50 E	Manawa, WI
Apr 12, 4:05 AM CDT	Thunderstorm Wind 50 E	Oshkosh, WI
Apr 12, 4:08 AM CDT	Thunderstorm Wind 50 E	Hortonville, 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 nearest sounding before it

Green Bay/Straub, WI (KGRB), launched 00:00Z, 9.0 hours before the alert went out and 65 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: 737 m above ground
0-6 km bulk shear: 58 kt
0-1 km storm-relative helicity: 11 m²/s²
0-3 km storm-relative helicity: 33 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.

967 
WUUS53 KGRB 120857
SVRGRB
WIC087-135-139-120945-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE GREEN BAY WI
357 AM CDT THU APR 12 2001

THE NATIONAL WEATHER SERVICE IN GREEN BAY HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  WINNEBAGO COUNTY IN WISCONSIN
  OUTAGAMIE COUNTY IN WISCONSIN
  WAUPACA COUNTY IN WISCONSIN

* UNTIL 445 AM CDT

* AT 357 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR AND SPOTTER
  REPORTS INDICATED A LINE OF SEVERE THUNDERSTORMS WITH 60 MPH WINDS.
  THE LINE EXTENDED FROM 20 MILES WEST OF CLINTONVILLE TO OSHKOSH. IT
  WAS MOVING NORTHEAST AT 45 MPH.

* SOME LOCATIONS THAT WILL BE AFFECTED BY THE STORMS INCLUDE...
  ALLENVILLE BY 400 AM CDT.
  BIG FALLS BY 400 AM CDT.
  DALE BY 400 AM CDT.
  LARSEN BY 400 AM CDT.

THESE STORMS COULD DAMAGE WEAK STRUCTURES AND TREES. IF YOU ARE IN
THE PATH OF THESE STORMS...TAKE COVER IN A STURDY BUILDING UNTIL THE
STORMS HAVE PASSED.

LAT...LON 4393 8866 4400 8842 4466 8877 4466 8920
          4444 8919 4424 8902 4423 8888 4409 8888
PLH

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 12, 3:08 AM CDT	Severe Thunderstorm Warning	GRB	Portage, Wood	52 min
Apr 12, 3:08 AM CDT	Severe Thunderstorm Warning	GRB	Waushara	52 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.