Alert archive / Wisconsin / Tornado Warnings in 2021

Tornado Warning 7, NWS Duluth, MN

September 20, 2021Bayfield County, Wisconsin

NWS Duluth, MN issued this tornado warning at Sep 20, 2021, 5:29 PM CDT for Bayfield County, Wisconsin. It was in force for 31 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Sep 20, 2021, 5:29 PM CDT (22:29 UTC)
Expired: Sep 20, 2021, 6:00 PM CDT
In force: 31 min
Issued by: NWS Duluth, MN
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 0.0 in

County Bayfield County, WI

The radar

The Duluth radar (KDLH), 96 km from the middle of the area, began a volume at 22:34 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.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Sep 20, 5:14 PM CDT	Tornado Watch	SPC	3 hr

The nearest sounding before it

Minneapolis, MN (KMPX), launched 12:00Z, 10.5 hours before the alert went out and 241 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: 148 J/kg
Mixed-layer CIN: -141 J/kg
Mixed-layer LCL: 1002 m above ground
0-6 km bulk shear: 37 kt
0-1 km storm-relative helicity: 210 m²/s²
0-3 km storm-relative helicity: 162 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.4

Open this sounding in Storm Lab

The text

As transmitted.

583 
WFUS53 KDLH 202229
TORDLH
WIC007-202300-
/O.NEW.KDLH.TO.W.0007.210920T2229Z-210920T2300Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Duluth MN
529 PM CDT Mon Sep 20 2021

The National Weather Service in Duluth MN has issued a

* Tornado Warning for...
  Southern Bayfield County in northwestern Wisconsin...

* Until 600 PM CDT.
    
* At 529 PM CDT, severe thunderstorms capable of producing a tornado
  were located along a line extending from 6 miles northwest of
  Cable, to near Seeley, moving northeast at 45 mph.

  HAZARD...Tornado.

  SOURCE...Radar indicated rotation.

  IMPACT...Flying debris will be dangerous to those caught without 
           shelter. Mobile homes will be damaged or destroyed. 
           Damage to roofs, windows, and vehicles will occur. Tree 
           damage is likely.

* These dangerous storms will be near...
  Cable and Drummond around 540 PM CDT.

Other locations in the path of these tornadic storms include
Namekagon Lake and Namekagon.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.

&&

LAT...LON 4629 9147 4650 9094 4623 9094 4616 9129
      4616 9148
TIME...MOT...LOC 2229Z 239DEG 39KT 4626 9141 4615 9143 

TORNADO...RADAR INDICATED
MAX HAIL SIZE...0.00 IN

$$

Huyck

2 follow-up statements

127 
WWUS53 KDLH 202239
SVSDLH

Severe Weather Statement
National Weather Service Duluth MN
539 PM CDT Mon Sep 20 2021

WIC007-202300-
/O.CON.KDLH.TO.W.0007.000000T0000Z-210920T2300Z/
Bayfield WI-
539 PM CDT Mon Sep 20 2021

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 600 PM CDT FOR
SOUTHEASTERN BAYFIELD COUNTY...
    
At 539 PM CDT, severe thunderstorms capable of producing tornadoes
were located along a line extending from Drummond, to Cable, moving
northeast at 45 mph.

HAZARD...Tornado.

SOURCE...Radar indicated rotation.

IMPACT...Flying debris will be dangerous to those caught without 
         shelter. Mobile homes will be damaged or destroyed. Damage 
         to roofs, windows, and vehicles will occur. Tree damage is 
         likely.

Locations impacted include...
  Namekagon Lake and Namekagon.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.

&&

LAT...LON 4616 9134 4637 9126 4650 9094 4623 9094
      4616 9129
TIME...MOT...LOC 2239Z 237DEG 39KT 4634 9126 4626 9128 4619 9131 

TORNADO...RADAR INDICATED
MAX HAIL SIZE...0.00 IN

$$

Huyck

956 
WWUS53 KDLH 202254
SVSDLH

Severe Weather Statement
National Weather Service Duluth MN
554 PM CDT Mon Sep 20 2021

WIC007-202300-
/O.CON.KDLH.TO.W.0007.000000T0000Z-210920T2300Z/
Bayfield WI-
554 PM CDT Mon Sep 20 2021

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 600 PM CDT FOR
SOUTHEASTERN BAYFIELD COUNTY...
    
At 554 PM CDT, severe thunderstorms capable of producing tornadoes
were located along a line extending from near Benoit, to near
Namekagon Lake, moving northeast at 45 mph.

HAZARD...Tornado.

SOURCE...Radar indicated rotation.

IMPACT...Flying debris will be dangerous to those caught without 
         shelter. Mobile homes will be damaged or destroyed. Damage 
         to roofs, windows, and vehicles will occur. Tree damage is 
         likely.

Locations impacted include...
Namekagon, Namekagon Lake, Mason, and Grand View. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.

&&

LAT...LON 4623 9094 4617 9123 4644 9108 4650 9094
TIME...MOT...LOC 2254Z 238DEG 39KT 4645 9104 4621 9117 

TORNADO...RADAR INDICATED
MAX HAIL SIZE...0.00 IN

$$

Huyck

The office that day

Everything else NWS Duluth, MN issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Sep 20, 4:51 PM CDT	Special Weather Statement	DLH	Washburn	24 min
Sep 20, 4:59 PM CDT	Tornado Warning	DLH	Bayfield, Douglas, Sawyer, Washburn	31 min
Sep 20, 5:04 PM CDT	Tornado Warning	DLH	Bayfield, Douglas	26 min
Sep 20, 5:24 PM CDT	Tornado Warning	DLH	Bayfield	36 min
Sep 20, 5:49 PM CDT	Areal Flood Warning	DLH	Bayfield, Douglas	3 hr
Sep 20, 5:52 PM CDT	Tornado Warning	DLH	Ashland, Bayfield	23 min
Sep 20, 5:57 PM CDT	Severe Thunderstorm Warning	DLH	Ashland, Bayfield, Iron, Sawyer	63 min
Sep 20, 6:31 PM CDT	Special Weather Statement	DLH	Sawyer	29 min

Nearby

Tornado Warnings in Wisconsin, 2021 Every tornado warning in 2021 Tornadoes in 2021

Sources

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