Alert archive / Wisconsin / Tornado Warnings in 2021

Tornado Warning 4, NWS Duluth, MN

September 20, 20214 counties in Wisconsin

NWS Duluth, MN issued this tornado warning at Sep 20, 2021, 4:59 PM CDT for 4 counties in Wisconsin. It was in force for 31 min. 1 report 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: Sep 20, 2021, 4:59 PM CDT (21:59 UTC)
Expired: Sep 20, 2021, 5:30 PM CDT
In force: 31 min
Issued by: NWS Duluth, MN
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 0.0 in

Counties Bayfield County, WI, Douglas County, WI, Sawyer County, WI, Washburn County, WI

The radar

The Duluth radar (KDLH), 90 km from the middle of the area, began a volume at 21:58 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
Sep 20, 5:05 PM CDT	TSTM WND DMG	4 Ene Minong, WI	TREE DOWN. TIME ESTIMATED FROM RADAR.

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

The nearest sounding before it

Minneapolis, MN (KMPX), launched 12:00Z, 10.0 hours before the alert went out and 205 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.

703 
WFUS53 KDLH 202159
TORDLH
WIC007-031-113-129-202230-
/O.NEW.KDLH.TO.W.0004.210920T2159Z-210920T2230Z/

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

The National Weather Service in Duluth MN has issued a

* Tornado Warning for...
  Southwestern Bayfield County in northwestern Wisconsin...
  Southeastern Douglas County in northwestern Wisconsin...
  Northeastern Washburn County in northwestern Wisconsin...
  Northwestern Sawyer County in northwestern Wisconsin...

* Until 530 PM CDT.
    
* At 459 PM CDT, a severe thunderstorm capable of producing a tornado
  was located over Minong, or 15 miles west of Hayward, moving east
  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...
  Seeley.

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 4602 9186 4611 9191 4630 9147 4612 9135
TIME...MOT...LOC 2159Z 247DEG 37KT 4609 9179 

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

$$

Huyck

2 follow-up statements

158 
WWUS53 KDLH 202207
SVSDLH

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

WIC007-031-113-129-202230-
/O.CON.KDLH.TO.W.0004.000000T0000Z-210920T2230Z/
Bayfield WI-Douglas WI-Washburn WI-Sawyer WI-
507 PM CDT Mon Sep 20 2021

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 530 PM CDT FOR
SOUTHWESTERN BAYFIELD...SOUTHEASTERN DOUGLAS...NORTHEASTERN WASHBURN
AND NORTHWESTERN SAWYER COUNTIES...
    
At 507 PM CDT, a severe thunderstorm capable of producing a tornado
was located near Wascott, or 13 miles northwest of Hayward, moving
northeast at 40 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...
Totagatic Flowage and Totagatic Lake. 

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 4608 9172 4617 9177 4630 9147 4613 9136
TIME...MOT...LOC 2207Z 244DEG 37KT 4614 9170 

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

$$

Huyck

604 
WWUS53 KDLH 202217
SVSDLH

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

WIC007-031-113-129-202230-
/O.CON.KDLH.TO.W.0004.000000T0000Z-210920T2230Z/
Bayfield WI-Douglas WI-Washburn WI-Sawyer WI-
517 PM CDT Mon Sep 20 2021

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 530 PM CDT FOR
SOUTHWESTERN BAYFIELD...SOUTHEASTERN DOUGLAS...NORTHEASTERN WASHBURN
AND NORTHWESTERN SAWYER COUNTIES...
    
At 516 PM CDT, a severe thunderstorm capable of producing a tornado
was located 10 miles east of Wascott, or 13 miles north of Hayward,
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...
Totagatic Flowage and Totagatic Lake. 

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 4609 9162 4620 9169 4630 9147 4613 9136
      4612 9140
TIME...MOT...LOC 2216Z 245DEG 40KT 4619 9157 

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, 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, 5:29 PM CDT	Tornado Warning	DLH	Bayfield	31 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.