Alert archive / Wisconsin / Tornado Warnings in 2011

Tornado Warning 9, NWS Green Bay, WI

April 10, 2011Florence County, Forest County, Marinette County, Wisconsin

NWS Green Bay, WI issued this tornado warning at Apr 10, 2011, 7:42 PM CDT for Florence County, Forest County, Marinette County, Wisconsin. It was in force for 48 min. 2 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 10, 2011, 7:42 PM CDT (00:42 UTC)
Expired: Apr 10, 2011, 8:30 PM CDT
In force: 48 min
Issued by: NWS Green Bay, WI
Area: Storm-based polygon

Counties Florence County, WI, Forest County, WI, Marinette County, WI

The radar

The Marquette radar (KMQT), 97 km from the middle of the area, began a volume at 00:43 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 10, 8:03 PM CDT	TORNADO	4 W Armstrong Creek, WI	EF1 TORNADO IN EASTERN FOREST COUNTY. PATH LENGTH APPROX 3.2 MILES, PATH WIDTH 250 YARDS.
Apr 10, 8:08 PM CDT	TSTM WND DMG	3 W Armstrong Creek, WI	HOUSE AND GARAGE DESTROYED.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

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 10, 3:19 PM CDT	Tornado Watch PDS	SPC	7 hr

The nearest sounding before it

Green Bay/Straub, WI (KGRB), launched 00:00Z, 0.7 hours before the alert went out and 140 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: 1647 J/kg
Mixed-layer CIN: -38 J/kg
Mixed-layer LCL: 1073 m above ground
0-6 km bulk shear: 74 kt
0-1 km storm-relative helicity: 399 m²/s²
0-3 km storm-relative helicity: 397 m²/s²
Significant tornado parameter: 4.2
Supercell composite: 11.4

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

901 
WFUS53 KGRB 110042
TORGRB
WIC037-041-075-110130-
/O.NEW.KGRB.TO.W.0009.110411T0042Z-110411T0130Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE GREEN BAY WI
742 PM CDT SUN APR 10 2011

THE NATIONAL WEATHER SERVICE IN GREEN BAY HAS ISSUED A

* TORNADO WARNING FOR...
  FLORENCE COUNTY IN NORTHEAST WISCONSIN...
  CENTRAL FOREST COUNTY IN NORTHEAST WISCONSIN...
  NORTHERN MARINETTE COUNTY IN NORTHEAST WISCONSIN...

* UNTIL 830 PM CDT

* AT 738 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO. THIS DANGEROUS
  STORM WAS LOCATED 11 MILES NORTHEAST OF CRANDON...AND MOVING
  NORTHEAST AT 35 MPH. ANOTHER STORM WAS LOCATED A LITTLE FARTHER 
  SOUTHWEST...JUST SOUTHWEST OF CRANDON. BOTH STORMS ARE ALSO 
  CAPABLE OF PRODUCING HAIL TO THE SIZE OF GOLF BALLS.

* LOCATIONS IMPACTED INCLUDE...
  TIPLER...GOODMAN...PEMBINE...FLORENCE...CAVOUR...NEWALD...LONG LAKE
  AND ARMSTRONG CREEK.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TORNADOES ARE DIFFICULT TO SEE AT NIGHT. TAKE COVER NOW.

&&

LAT...LON 4593 8810 4590 8810 4587 8806 4582 8812
      4579 8807 4580 8799 4577 8796 4575 8787
      4569 8777 4566 8781 4561 8777 4557 8778
      4557 8782 4553 8780 4547 8905 4569 8904
      4601 8849
TIME...MOT...LOC 0041Z 238DEG 32KT 4570 8874

$$

SKOWRONSKI

4 follow-up statements

814 
WWUS53 KGRB 110052
SVSGRB

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE GREEN BAY WI
752 PM CDT SUN APR 10 2011

WIC037-041-075-110130-
/O.CON.KGRB.TO.W.0009.000000T0000Z-110411T0130Z/
FOREST WI-FLORENCE WI-MARINETTE WI-
752 PM CDT SUN APR 10 2011

...A TORNADO WARNING REMAINS IN EFFECT FOR NORTHERN MARINETTE...
FLORENCE AND CENTRAL FOREST COUNTIES UNTIL 830 PM CDT...

AT 747 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO.  THIS DANGEROUS
STORM WAS LOCATED 13 MILES SOUTH OF TIPLER...OR 16 MILES NORTHEAST OF
CRANDON...MOVING NORTHEAST AT 35 MPH. ANOTHER STORM...ALSO CAPABLE 
OF PRODUCING A TORNADO...WAS LOCATED JUST EAST OF CRANDON.

LOCATIONS IMPACTED INCLUDE...
  TIPLER...GOODMAN...PEMBINE...FLORENCE...LONG LAKE...ARMSTRONG
  CREEK...FENCE AND DUNBAR.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS IS A DANGEROUS SITUATION. IF YOU ARE IN THE WARNED AREA...TAKE 
COVER NOW. MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A STURDY 
BUILDING. AVOID WINDOWS. IF IN A MOBILE HOME...A VEHICLE OR 
OUTDOORS...MOVE TO THE CLOSEST SUBSTANTIAL SHELTER AND PROTECT 
YOURSELF FROM FLYING DEBRIS.

TORNADOES ARE DIFFICULT TO SEE AT NIGHT. TAKE COVER NOW.

&&

LAT...LON 4548 8887 4578 8889 4601 8849 4593 8810
      4590 8810 4587 8806 4582 8812 4579 8807
      4580 8799 4577 8796 4575 8787 4569 8777
      4566 8781 4561 8777 4557 8778 4557 8782
      4553 8780
TIME...MOT...LOC 0050Z 238DEG 32KT 4574 8864

$$

SKOWRONSKI

331 
WWUS53 KGRB 110105
SVSGRB

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE GREEN BAY WI
805 PM CDT SUN APR 10 2011

WIC037-041-075-110130-
/O.CON.KGRB.TO.W.0009.000000T0000Z-110411T0130Z/
FOREST WI-FLORENCE WI-MARINETTE WI-
805 PM CDT SUN APR 10 2011

...A TORNADO WARNING REMAINS IN EFFECT FOR NORTHERN MARINETTE...
FLORENCE AND EAST CENTRAL FOREST COUNTIES UNTIL 830 PM CDT...

AT 801 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO.  THIS DANGEROUS
STORM WAS LOCATED 10 MILES SOUTHEAST OF TIPLER...OR 20 MILES WEST OF 
KINGSFORD...MOVING NORTHEAST AT 35 MPH. ANOTHER INTENSE STORM...ALSO 
CAPABLE OR PRODUCING A TORNADO...WAS LOCATED JUST WEST OF ARMSTRONG 
CREEK. 

LOCATIONS IMPACTED INCLUDE...
  PEMBINE...FLORENCE...FENCE...DUNBAR...COMMONWEALTH...AURORA...
  SPREAD EAGLE AND NIAGARA.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IF YOU ARE IN THE WARNED AREA...TAKE COVER NOW. MOVE TO AN INTERIOR 
ROOM ON THE LOWEST FLOOR OF A STURDY BUILDING. AVOID WINDOWS. IF IN 
A MOBILE HOME...MOVE TO THE CLOSEST SUBSTANTIAL SHELTER AND PROTECT 
YOURSELF FROM FLYING DEBRIS.

&&

LAT...LON 4557 8864 4589 8861 4599 8840 4593 8810
      4590 8810 4587 8806 4582 8812 4579 8807
      4580 8799 4577 8796 4575 8787 4569 8777
      4566 8781 4561 8777
TIME...MOT...LOC 0103Z 238DEG 32KT 4580 8850

$$

SKOWRONSKI

924 
WWUS53 KGRB 110117
SVSGRB

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE GREEN BAY WI
817 PM CDT SUN APR 10 2011

WIC037-041-075-110130-
/O.CON.KGRB.TO.W.0009.000000T0000Z-110411T0130Z/
FOREST WI-FLORENCE WI-MARINETTE WI-
817 PM CDT SUN APR 10 2011

...A TORNADO WARNING REMAINS IN EFFECT FOR NORTHWESTERN MARINETTE...
EASTERN FLORENCE AND EAST CENTRAL FOREST COUNTIES UNTIL 830 PM CDT...

AT 810 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A 
CLUSTER OF SEVERE THUNDERSTORMS OVER FAR NORTHEAST WISCONSIN. THE 
CLUSTER WAS CENTERED 6 MILES NORTHWEST OF GOODMAN...OR 17 MILES 
SOUTHWEST OF KINGSFORD...AND MOVING EAST AT 45 MPH. THE STORMS HAD 
WEAKENED...SO THE RISK OF THE STORMS PRODUCING A TORNADO WAS 
STARTING TO LESSEN. HOWEVER...IT IS STILL POSSIBLE THAT THE STORMS 
WILL STRENGTHEN A BIT BEFORE MOVING INTO UPPER MICHIGAN. AS A 
RESULT...THE TORNADO WARNING WILL BE ALLOWED TO CONTINUE UNTIL ITS 
SCHEDULED EXPIRATION AT 830 PM.

LOCATIONS IMPACTED INCLUDE...
  FLORENCE...DUNBAR...COMMONWEALTH...AURORA...NIAGARA AND SPREAD
  EAGLE.

LAT...LON 4566 8781 4562 8851 4596 8846 4599 8840
      4593 8810 4590 8810 4587 8806 4582 8812
      4579 8807 4580 8799 4577 8796 4575 8787
      4569 8777
TIME...MOT...LOC 0114Z 249DEG 40KT 4571 8836

$$

SKOWRONSKI

603 
WWUS53 KGRB 110129
SVSGRB

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE GREEN BAY WI
829 PM CDT SUN APR 10 2011

WIC037-041-075-110138-
/O.EXP.KGRB.TO.W.0009.000000T0000Z-110411T0130Z/
FOREST WI-FLORENCE WI-MARINETTE WI-
829 PM CDT SUN APR 10 2011

...THE TORNADO WARNING FOR NORTHWESTERN MARINETTE...EASTERN FLORENCE
AND EAST CENTRAL FOREST COUNTIES WILL EXPIRE AT 830 PM CDT...

THE STORM WHICH PROMPTED THE WARNING HAS WEAKENED AND WILL MOVE OUT 
OF THE AREA AROUND 830 PM. HOWEVER GUSTY WINDS ARE STILL POSSIBLE 
NEAR THE MICHIGAN BORDER.

LAT...LON 4566 8781 4562 8851 4596 8846 4599 8840
      4593 8810 4590 8810 4587 8806 4582 8812
      4579 8807 4580 8799 4577 8796 4575 8787
      4569 8777
TIME...MOT...LOC 0128Z 241DEG 49KT 4586 8807

$$

SKOWRONSKI

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 10, 7:11 PM CDT	Severe Thunderstorm Warning	GRB	Waushara	34 min
Apr 10, 7:15 PM CDT	Tornado Warning	GRB	Forest, Langlade, Oneida	30 min
Apr 10, 7:27 PM CDT	Tornado Warning	GRB	Waushara	33 min
Apr 10, 7:29 PM CDT	Tornado Warning	GRB	Outagamie, Waupaca	46 min
Apr 10, 7:56 PM CDT	Tornado Warning	GRB	Outagamie, Waupaca, Waushara, Winnebago	34 min
Apr 10, 8:10 PM CDT	Areal Flood Advisory	GRB	Calumet, Outagamie, Winnebago	117 min
Apr 10, 8:29 PM CDT	Tornado Warning	GRB	Winnebago	31 min
Apr 10, 8:29 PM CDT	Tornado Warning	GRB	Brown, Calumet, Outagamie, Winnebago	31 min
Apr 10, 8:56 PM CDT	Tornado Warning	GRB	Calumet, Winnebago	34 min
Apr 10, 9:00 PM CDT	Tornado Warning	GRB	Brown	30 min
Apr 10, 9:02 PM CDT	Special Marine Warning	GRB		106 min
Apr 10, 9:16 PM CDT	Tornado Warning	GRB	Manitowoc	29 min
Apr 10, 9:19 PM CDT	Severe Thunderstorm Warning	GRB	Kewaunee	26 min
Apr 10, 9:34 PM CDT	Tornado Warning	GRB	Manitowoc	26 min
Apr 10, 9:46 PM CDT	River Flood Warning	GRB	Marathon, Portage	4 days
Apr 10, 9:46 PM CDT	River Flood Warning	GRB	Portage, Wood	63 hr
Apr 10, 10:13 PM CDT	River Flood Warning	GRB	Outagamie	24 days
Apr 10, 10:13 PM CDT	River Flood Warning	GRB	Outagamie, Waupaca	12 days
Apr 10, 10:13 PM CDT	River Flood Warning	GRB	Waupaca	60 hr
Apr 11, 10:14 AM CDT	River Flood Warning	GRB	Marathon	46 hr
Apr 11, 11:46 AM CDT	River Flood Warning	GRB	Lincoln	45 hr

Nearby

Tornado Warnings in Wisconsin, 2011 Every tornado warning in 2011 Tornadoes in 2011

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.