Alert archive / Wisconsin / Tornado Warnings in 2011

Tornado Warning 16, NWS Green Bay, WI

April 10, 2011Manitowoc County, Wisconsin

NWS Green Bay, WI issued this tornado warning at Apr 10, 2011, 9:34 PM CDT for Manitowoc County, Wisconsin. It was in force for 26 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, 9:34 PM CDT (02:34 UTC)
Expired
Apr 10, 2011, 10:00 PM CDT
In force
26 min
Issued by
NWS Green Bay, WI
Area
Storm-based polygon

County Manitowoc County, WI

The radar

The Green Bay radar (KGRB), 54 km from the middle of the area, began a volume at 02:33 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

TimeReportWhereRemark
Apr 10, 9:38 PM CDTTSTM WND GST 65Manitowoc, WI
Apr 10, 9:57 PM CDTTSTM WND DMGCleveland, WITREES DOWN

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.

IssuedProductOfficeLasted
Apr 10, 3:19 PM CDTTornado Watch PDSSPC7 hr

The nearest sounding before it

Green Bay/Straub, WI (KGRB), launched 00:00Z, 2.6 hours before the alert went out and 52 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 2011-04-11Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1647 joules per kilogram.LCLLFCEL10008507005003002001001 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 2011-04-11The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 399 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
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.

211 
WFUS53 KGRB 110234
TORGRB
WIC071-110300-
/O.NEW.KGRB.TO.W.0016.110411T0234Z-110411T0300Z/

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

THE NATIONAL WEATHER SERVICE IN GREEN BAY HAS ISSUED A

* TORNADO WARNING FOR...
  MANITOWOC COUNTY IN EAST CENTRAL WISCONSIN...

* UNTIL 1000 PM CDT

* AT 929 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO. THIS DANGEROUS
  STORM WAS LOCATED 6 MILES NORTHWEST OF MANITOWOC...AND MOVING EAST
  AT 55 MPH.

* THIS DANGEROUS STORM WILL BE NEAR...
  TWO CREEKS...KIEL AND CLEVELAND

OTHER LOCATIONS IMPACTED BY THIS DANGEROUS STORM INCLUDE POINT BEACH 
STATE FOREST.

THIS TORNADO WARNING REPLACED THE PREVIOUS TORNADO WARNING FOR 
MANITOWOC COYNTY. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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 4395 8804 4415 8792 4433 8753 4430 8753
      4422 8750 4418 8750 4413 8755 4409 8764
      4389 8772 4389 8803
TIME...MOT...LOC 0233Z 248DEG 47KT 4418 8764

$$

EB
3 follow-up statements
694 
WWUS53 KGRB 110242
SVSGRB

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

WIC071-110300-
/O.CON.KGRB.TO.W.0016.000000T0000Z-110411T0300Z/
MANITOWOC WI-
942 PM CDT SUN APR 10 2011

...A TORNADO WARNING REMAINS IN EFFECT FOR SOUTHEAST MANITOWOC 
COUNTY UNTIL 1000 PM CDT...

AT 938 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED 
SEVERE THUNDERSTORMS CAPABLE OF PRODUCING A TORNADO.  THE DANGEROUS 
STORMS WERE LOCATED NEAR MISHICOT...MANITOWOC AND CLEVELAND.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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 4395 8799 4410 8781 4430 8756 4430 8753
      4422 8750 4418 8750 4413 8755 4409 8764
      4389 8772 4389 8803
TIME...MOT...LOC 0240Z 260DEG 49KT 4393 8776

$$

EB
082 
WWUS53 KGRB 110250
SVSGRB

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

WIC071-110300-
/O.CON.KGRB.TO.W.0016.000000T0000Z-110411T0300Z/
MANITOWOC WI-
950 PM CDT SUN APR 10 2011

...A TORNADO WARNING REMAINS IN EFFECT FOR EXTREME SOUTHEAST 
MANITOWOC COUNTY UNTIL 1000 PM CDT...

AT 943 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A 
LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING A TORNADO.  THESE 
DANGEROUS STORMS WERE LOCATED ALONG THE LAKESHORE...NEAR CLEVELAND 
AND NEWTON MOVING EAST AT 50 MPH.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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 4397 8796 4398 8796 4404 8779 4421 8760
      4428 8752 4422 8750 4418 8750 4413 8755
      4409 8764 4389 8772 4389 8803
TIME...MOT...LOC 0248Z 260DEG 49KT 4394 8761

$$

EB
640 
WWUS53 KGRB 110300
SVSGRB

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE GREEN BAY WI
1000 PM CDT SUN APR 10 2011

WIC071-110307-
/O.EXP.KGRB.TO.W.0016.000000T0000Z-110411T0300Z/
MANITOWOC WI-
1000 PM CDT SUN APR 10 2011

...THE TORNADO WARNING FOR SOUTHERN MANITOWOC COUNTY WILL EXPIRE AT
1000 PM CDT...

THE STORMS WHICH PROMPTED THE WARNING HAVE WEAKEN AND NO LONGER POSE 
A TORNADO THREAT. A FEW STRONG STORMS NEAR NEWTON AND CLEVELAND MAY 
PRODUCE GUSTY WINDS TO 50 MPH AND SMALL HAIL BEFORE MOVING OFF SHORE.

LAT...LON 4397 8796 4398 8796 4404 8779 4421 8760
      4428 8752 4422 8750 4418 8750 4413 8755
      4409 8764 4389 8772 4389 8803
TIME...MOT...LOC 0257Z 260DEG 49KT 4395 8744

$$

EB

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 10, 7:11 PM CDTSevere Thunderstorm WarningGRBWaushara34 min
Apr 10, 7:15 PM CDTTornado WarningGRBForest, Langlade, Oneida30 min
Apr 10, 7:27 PM CDTTornado WarningGRBWaushara33 min
Apr 10, 7:29 PM CDTTornado WarningGRBOutagamie, Waupaca46 min
Apr 10, 7:42 PM CDTTornado WarningGRBFlorence, Forest, Marinette48 min
Apr 10, 7:56 PM CDTTornado WarningGRBOutagamie, Waupaca, Waushara, Winnebago34 min
Apr 10, 8:10 PM CDTAreal Flood AdvisoryGRBCalumet, Outagamie, Winnebago117 min
Apr 10, 8:29 PM CDTTornado WarningGRBWinnebago31 min
Apr 10, 8:29 PM CDTTornado WarningGRBBrown, Calumet, Outagamie, Winnebago31 min
Apr 10, 8:56 PM CDTTornado WarningGRBCalumet, Winnebago34 min
Apr 10, 9:00 PM CDTTornado WarningGRBBrown30 min
Apr 10, 9:02 PM CDTSpecial Marine WarningGRB106 min
Apr 10, 9:16 PM CDTTornado WarningGRBManitowoc29 min
Apr 10, 9:19 PM CDTSevere Thunderstorm WarningGRBKewaunee26 min
Apr 10, 9:46 PM CDTRiver Flood WarningGRBMarathon, Portage4 days
Apr 10, 9:46 PM CDTRiver Flood WarningGRBPortage, Wood63 hr
Apr 10, 10:13 PM CDTRiver Flood WarningGRBOutagamie24 days
Apr 10, 10:13 PM CDTRiver Flood WarningGRBOutagamie, Waupaca12 days
Apr 10, 10:13 PM CDTRiver Flood WarningGRBWaupaca60 hr
Apr 11, 10:14 AM CDTRiver Flood WarningGRBMarathon46 hr
Apr 11, 11:46 AM CDTRiver Flood WarningGRBLincoln45 hr

Nearby

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