Alert archive / Wisconsin / Severe Thunderstorm Warnings in 2002

Severe Thunderstorm Warning 18, NWS Green Bay, WI

April 18, 2002Portage County, Shawano County, Wisconsin

NWS Green Bay, WI issued this severe thunderstorm warning at Apr 18, 2002, 7:42 PM CDT for Portage County, Shawano County, Wisconsin. It was in force for 63 min. 3 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Apr 18, 2002, 7:42 PM CDT (00:42 UTC)
Expired: Apr 18, 2002, 8:45 PM CDT
In force: 63 min
Issued by: NWS Green Bay, WI
Area: Counties, with a storm outline in the text

Counties Portage County, WI, Shawano County, WI

The radar

The Green Bay radar (KGRB), 103 km from the middle of the area, began a volume at 00:41 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
Apr 18, 7:45 PM CDT	Thunderstorm Wind 50 E	Plover, WI
Apr 18, 7:50 PM CDT	Thunderstorm Wind 60 E	Pike Lake, WI
Apr 18, 7:55 PM CDT	Thunderstorm Wind 55 E	Wittenberg, 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 18, 2:30 PM CDT	Tornado Watch	SPC	6 hr

The nearest sounding before it

Green Bay/Straub, WI (KGRB), launched 00:00Z, 0.7 hours before the alert went out and 104 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: 188 J/kg
Mixed-layer CIN: -106 J/kg
Mixed-layer LCL: 2321 m above ground
0-6 km bulk shear: 42 kt
0-1 km storm-relative helicity: 216 m²/s²
0-3 km storm-relative helicity: 288 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 
WUUS53 KGRB 190042
SVRGRB
WIC097-115-190145-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE GREEN BAY WI
739 PM CDT THU APR 18 2002

THE NATIONAL WEATHER SERVICE IN GREEN BAY HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  PORTAGE COUNTY IN WISCONSIN
  WESTERN SHAWANO COUNTY IN WISCONSIN

* UNTIL 845 PM CDT

* AT 739 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR DETECTED A
  LINE OF SEVERE THUNDERSTORMS WITH DAMAGING WINDS AND LARGE HAIL.
  THE LINE WAS LOCATED FROM EXTREME EASTERN MARATHON COUNTY TO       
  WESTERN PORTAGE COUNTY. THE LINE WAS MOVING EAST AT 60 MPH.

* SOME LOCATIONS THAT WILL BE AFFECTED BY THE STORMS INCLUDE...
  BIRNAMWOOD BY 740 PM CDT.
  ANIWA BY 740 PM CDT.
  WITTENBERG BY 745 PM CDT.
  AMHERST BY 745 PM 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.

REPORT SEVERE WEATHER TO THE NEAREST LAW ENFORCEMENT AGENCY. THEY
WILL RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE FORECAST
OFFICE IN GREEN BAY.

LAT...LON 4510 8942 4487 8948 4442 8959 4432 8924
          4466 8924 4502 8902

BRUSKY

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 18, 7:03 PM CDT	Flash Flood Warning	GRB	Florence, Forest, Oneida, Vilas	117 min
Apr 18, 7:17 PM CDT	Severe Thunderstorm Warning	GRB	Florence	28 min
Apr 18, 7:26 PM CDT	Severe Thunderstorm Warning	GRB	Lincoln, Oneida	49 min
Apr 18, 7:26 PM CDT	Tornado Warning	GRB	Marathon	34 min
Apr 18, 7:50 PM CDT	Severe Thunderstorm Warning	GRB	Langlade, Menominee	55 min
Apr 18, 8:08 PM CDT	Severe Thunderstorm Warning	GRB	Outagamie, Shawano, Waupaca	52 min
Apr 18, 8:25 PM CDT	Special Marine Warning	GRB		110 min
Apr 18, 8:25 PM CDT	Special Marine Warning	GRB		110 min
Apr 18, 8:25 PM CDT	Special Marine Warning	GRB		110 min
Apr 18, 8:30 PM CDT	Flash Flood Warning	GRB	Marinette	30 min
Apr 18, 8:59 PM CDT	Severe Thunderstorm Warning	GRB	Calumet, Winnebago	46 min
Apr 18, 9:13 PM CDT	Severe Thunderstorm Warning	GRB	Manitowoc	32 min

Nearby

Severe Thunderstorm Warnings in Wisconsin, 2002 Every severe thunderstorm warning in 2002

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.