Alert archive / Minnesota / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 121, NWS Twin Cities, MN

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

NWS Twin Cities, MN issued this severe thunderstorm warning at Sep 16, 2021, 7:30 PM CDT for Kanabec County, Mille Lacs County, Morrison County, Minnesota. It was in force for 45 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, 7:30 PM CDT (00:30 UTC)
Expired: Sep 16, 2021, 8:15 PM CDT
In force: 45 min
Issued by: NWS Twin Cities, MN
Area: Storm-based polygon
Tornado: Possible
Hail: 1.0 in
Wind: 60.0 mph

Counties Kanabec County, MN, Mille Lacs County, MN, Morrison County, MN

The radar

The Minneapolis radar (KMPX), 115 km from the middle of the area, began a volume at 00:33 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

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, 0.5 hours before the alert went out and 299 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.

965 
WUUS53 KMPX 170030
SVRMPX
MNC065-095-097-170115-
/O.NEW.KMPX.SV.W.0121.210917T0030Z-210917T0115Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Twin Cities/Chanhassen MN
730 PM CDT Thu Sep 16 2021

The National Weather Service in the Twin Cities has issued a

* Severe Thunderstorm Warning for...
  Central Kanabec County in east central Minnesota...
  Central Mille Lacs County in east central Minnesota...
  East central Morrison County in central Minnesota...

* Until 815 PM CDT.

* At 730 PM CDT, a severe thunderstorm was located 10 miles north of
  Milaca, or 28 miles south of Mille Lacs Lake, moving east at 40
  mph.

  HAZARD...60 mph wind gusts and quarter size hail.

  SOURCE...Radar indicated.

  IMPACT...Hail damage to vehicles is expected. Expect wind damage 
           to roofs, siding, and trees.

* Locations impacted include...
  Mora and Quamba.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Tornado Watch remains in effect until midnight CDT for central and
east central Minnesota.

For your protection move to an interior room on the lowest floor of a
building.

A Tornado Watch remains in effect until midnight CDT for central and
east central Minnesota.

&&

LAT...LON 4586 9313 4585 9314 4578 9377 4582 9377
      4582 9384 4596 9394 4614 9327
TIME...MOT...LOC 0030Z 257DEG 34KT 4590 9373 

TORNADO...POSSIBLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

BPH

3 follow-up statements

398 
WWUS53 KMPX 170045
SVSMPX

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

MNC097-170055-
/O.CAN.KMPX.SV.W.0121.000000T0000Z-210917T0115Z/
Morrison MN-
745 PM CDT Thu Sep 16 2021

...THE SEVERE THUNDERSTORM WARNING FOR EAST CENTRAL MORRISON COUNTY
IS CANCELLED...
    
The severe thunderstorm which prompted the warning has moved out of 
the warned area. Therefore, the warning has been cancelled.

A Tornado Watch remains in effect until midnight CDT for east central
Minnesota.

LAT...LON 4588 9314 4584 9363 4601 9377 4614 9327
TIME...MOT...LOC 0045Z 257DEG 34KT 4593 9353 

$$

MNC065-095-170115-
/O.CON.KMPX.SV.W.0121.000000T0000Z-210917T0115Z/
Kanabec MN-Mille Lacs MN-
745 PM CDT Thu Sep 16 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 815 PM CDT
FOR CENTRAL KANABEC AND CENTRAL MILLE LACS COUNTIES...

At 745 PM CDT, a severe thunderstorm was located 8 miles northwest of
Ogilvie, or 27 miles south of Mille Lacs Lake, moving east at 40 mph.

HAZARD...60 mph wind gusts and quarter size hail.

SOURCE...Radar indicated.

IMPACT...Hail damage to vehicles is expected. Expect wind damage to 
         roofs, siding, and trees.

Locations impacted include...
Mora, Quamba, Knife Lake, Mora Airport and Warman. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Tornado Watch remains in effect until midnight CDT for east central
Minnesota.

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 4588 9314 4584 9363 4601 9377 4614 9327
TIME...MOT...LOC 0045Z 257DEG 34KT 4593 9353 

TORNADO...POSSIBLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

BPH

075 
WWUS53 KMPX 170055
SVSMPX

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

MNC065-095-170115-
/O.CON.KMPX.SV.W.0121.000000T0000Z-210917T0115Z/
Kanabec MN-Mille Lacs MN-
755 PM CDT Thu Sep 16 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 815 PM CDT
FOR CENTRAL KANABEC AND EAST CENTRAL MILLE LACS COUNTIES...

At 755 PM CDT, a severe thunderstorm was located 7 miles northwest of
Mora, or 22 miles west of Pine City, moving east at 40 mph.

HAZARD...Quarter size hail.

SOURCE...Radar indicated.

IMPACT...Damage to vehicles is expected.

Locations impacted include...
Quamba, Knife Lake and Warman. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Tornado Watch remains in effect until midnight CDT for east central
Minnesota.

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 4592 9316 4591 9345 4608 9350 4614 9327
TIME...MOT...LOC 0055Z 257DEG 34KT 4595 9339 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...<50 MPH

$$

BPH

502 
WWUS53 KMPX 170107
SVSMPX

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

MNC065-095-170117-
/O.EXP.KMPX.SV.W.0121.000000T0000Z-210917T0115Z/
Kanabec MN-Mille Lacs MN-
807 PM CDT Thu Sep 16 2021

...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL KANABEC AND EAST
CENTRAL MILLE LACS COUNTIES WILL EXPIRE AT 815 PM CDT...
        
The storm which prompted the warning has weakened below severe
limits, and has exited the warned area. Therefore, the warning will
be allowed to expire.

A Tornado Watch remains in effect until midnight CDT for east central
Minnesota.

LAT...LON 4592 9316 4591 9345 4608 9350 4614 9327
TIME...MOT...LOC 0107Z 257DEG 34KT 4597 9324 

$$

BPH

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 16, 7:07 PM CDT	Tornado Warning	MPX	Mille Lacs, Morrison	23 min
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, 7:43 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

Severe Thunderstorm Warnings in Minnesota, 2021 Every severe thunderstorm warning 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.