Alert archive / Minnesota / Tornado Warnings in 2021

Tornado Warning 24, NWS Twin Cities, MN

September 16, 2021Mille Lacs County, Morrison County, Minnesota

NWS Twin Cities, MN issued this tornado warning at Sep 16, 2021, 7:07 PM CDT for Mille Lacs County, Morrison County, Minnesota. It was in force for 23 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 16, 2021, 7:07 PM CDT (00:07 UTC)
Expired: Sep 16, 2021, 7:30 PM CDT
In force: 23 min
Issued by: NWS Twin Cities, MN
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 2.0 in

Counties Mille Lacs County, MN, Morrison County, MN

The radar

The Minneapolis radar (KMPX), 125 km from the middle of the area, began a volume at 00:09 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 16, 7:35 PM CDT	TSTM WND DMG	7 N Granite Ledge, MN	TREE DOWN ACROSS ROAD ON POWERLINES.

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
Sep 16, 5:57 PM CDT	Tornado Watch	SPC	4 hr

The nearest sounding before it

International Fa, MN (KINL), launched 00:00Z, 0.1 hours before the alert went out and 293 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 832 m above ground
0-6 km bulk shear: 75 kt
0-1 km storm-relative helicity: -33 m²/s²
0-3 km storm-relative helicity: 175 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.6

Open this sounding in Storm Lab

The text

As transmitted.

464 
WFUS53 KMPX 170007
TORMPX
MNC095-097-170030-
/O.NEW.KMPX.TO.W.0024.210917T0007Z-210917T0030Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Twin Cities/Chanhassen MN
707 PM CDT Thu Sep 16 2021

The National Weather Service in the Twin Cities has issued a

* Tornado Warning for...
  Northern Mille Lacs County in east central Minnesota...
  Southeastern Morrison County in central Minnesota...

* Until 730 PM CDT.
    
* At 706 PM CDT, a severe thunderstorm capable of producing a tornado
  was located 7 miles southeast of Pierz, or 18 miles east of Little
  Falls, moving east at 40 mph.

  HAZARD...Tornado and hail up to two inches in diameter.

  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...
  Onamia.

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 4613 9365 4591 9352 4582 9400 4582 9406
      4593 9418
TIME...MOT...LOC 0006Z 252DEG 36KT 4591 9398 

TORNADO...RADAR INDICATED
MAX HAIL SIZE...2.00 IN

$$

BPH

1 follow-up statement

435 
WWUS53 KMPX 170022 RRA
SVSMPX

Severe Weather Statement
National Weather Service Twin Cities/Chanhassen MN
722 PM CDT Thu Sep 16 2021

MNC095-097-170030-
/O.CON.KMPX.TO.W.0024.000000T0000Z-210917T0030Z/
Mille Lacs MN-Morrison MN-
722 PM CDT Thu Sep 16 2021

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 730 PM CDT FOR NORTHERN
MILLE LACS AND SOUTHEASTERN MORRISON COUNTIES...
    
At 722 PM CDT, a severe thunderstorm capable of producing a tornado
was located 8 miles southwest of Onamia, or 24 miles south of Mille
Lacs Lake, moving east at 40 mph.

HAZARD...Tornado and quarter size hail.

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...
Onamia and Hillman. 

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 4613 9365 4591 9352 4583 9395 4599 9402
TIME...MOT...LOC 0022Z 252DEG 36KT 4596 9376 

TORNADO...RADAR INDICATED
MAX HAIL SIZE...1.00 IN

$$

BPH

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 16, 7:08 PM CDT	Severe Thunderstorm Warning	MPX	Chippewa, Kandiyohi	37 min
Sep 16, 7:14 PM CDT	Special Weather Statement	MPX	Chippewa	31 min
Sep 16, 7:18 PM CDT	Severe Thunderstorm Warning	MPX	Chippewa, Kandiyohi, Renville	27 min
Sep 16, 7:30 PM CDT	Severe Thunderstorm Warning	MPX	Kanabec, Mille Lacs, Morrison	45 min
Sep 16, 7:43 PM CDT	Special Weather Statement	MPX	Mille Lacs	47 min
Sep 16, 7:44 PM CDT	Severe Thunderstorm Warning Considerable damage threat	MPX	Kandiyohi, Renville	31 min
Sep 16, 7:47 PM CDT	Special Weather Statement	MPX	Meeker	28 min
Sep 16, 7:53 PM CDT	Severe Thunderstorm Warning	MPX	Mille Lacs	37 min
Sep 16, 8:12 PM CDT	Severe Thunderstorm Warning	MPX	Kandiyohi, McLeod, Meeker, Renville	33 min
Sep 16, 8:38 PM CDT	Special Weather Statement	MPX	Isanti	37 min
Sep 16, 8:45 PM CDT	Severe Thunderstorm Warning	MPX	McLeod, Meeker, Wright	30 min
Sep 16, 9:12 PM CDT	Special Weather Statement	MPX	Hennepin	33 min
Sep 16, 10:24 PM CDT	Special Weather Statement	MPX	Lac qui Parle	36 min
Sep 16, 10:37 PM CDT	Special Weather Statement	MPX	Kanabec	23 min
Sep 16, 11:06 PM CDT	Special Weather Statement	MPX	Stearns	24 min
Sep 17, 12:09 AM CDT	Special Weather Statement	MPX	Mille Lacs	36 min
Sep 17, 12:21 AM CDT	Special Weather Statement	MPX	Benton	24 min
Sep 17, 12:47 AM CDT	Special Weather Statement	MPX	Mille Lacs	28 min
Sep 17, 12:55 AM CDT	Special Weather Statement	MPX	Redwood, Yellow Medicine	35 min
Sep 17, 1:10 AM CDT	Special Weather Statement	MPX	Kanabec	20 min
Sep 17, 1:20 AM CDT	Special Weather Statement	MPX	Benton	25 min
Sep 17, 1:29 AM CDT	Severe Thunderstorm Warning	MPX	Brown, Redwood, Renville	31 min
Sep 17, 1:48 AM CDT	Special Weather Statement	MPX	Kanabec, Mille Lacs	27 min
Sep 17, 1:53 AM CDT	Special Weather Statement	MPX	McLeod, Sibley	37 min
Sep 17, 2:00 AM CDT	Special Weather Statement	MPX	Brown, Nicollet	30 min
Sep 17, 2:29 AM CDT	Severe Thunderstorm Warning	MPX	Carver, McLeod, Scott, Sibley	16 min
Sep 17, 2:34 AM CDT	Special Weather Statement	MPX	Le Sueur, Rice	26 min
Sep 17, 2:45 AM CDT	Severe Thunderstorm Warning	MPX	Carver, Hennepin, Scott	15 min
Sep 17, 2:59 AM CDT	Severe Thunderstorm Warning	MPX	Anoka, Dakota, Hennepin, Ramsey, Scott, Washington	16 min
Sep 17, 3:15 AM CDT	Severe Thunderstorm Warning Considerable damage threat	MPX	Washington	15 min
Sep 17, 3:18 AM CDT	Special Weather Statement	MPX	Goodhue	27 min

Nearby

Tornado Warnings in Minnesota, 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.