Alert archive / Minnesota / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 115, NWS Twin Cities, MN

September 16, 2021Benton County, Morrison County, Stearns County, Minnesota

NWS Twin Cities, MN issued this severe thunderstorm warning at Sep 16, 2021, 6:26 PM CDT for Benton County, Morrison County, Stearns County, Minnesota. It was in force for 49 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: Sep 16, 2021, 6:26 PM CDT (23:26 UTC)
Expired: Sep 16, 2021, 7:15 PM CDT
In force: 49 min
Issued by: NWS Twin Cities, MN
Area: Storm-based polygon
Damage threat: Considerable
Hail: 1.75 in
Wind: 60.0 mph

Counties Benton County, MN, Morrison County, MN, Stearns County, MN

The radar

The Minneapolis radar (KMPX), 123 km from the middle of the area, began a volume at 23:28 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, 6:50 PM CDT	HAIL 1.5	2 W Buckman, MN	DELAYED REPORT. TIME APPROXIMATED VIA RADAR.
Sep 16, 7:05 PM CDT	HAIL 1.25	5 Nne Royalton, MN

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

Minneapolis, MN (KMPX), launched 12:00Z, 11.4 hours before the alert went out and 122 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: 1213 m above ground
0-6 km bulk shear: 36 kt
0-1 km storm-relative helicity: 362 m²/s²
0-3 km storm-relative helicity: 428 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 3.0

Open this sounding in Storm Lab

The text

As transmitted.

268 
WUUS53 KMPX 162326
SVRMPX
MNC009-097-145-170015-
/O.NEW.KMPX.SV.W.0115.210916T2326Z-210917T0015Z/

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

The National Weather Service in the Twin Cities has issued a

* Severe Thunderstorm Warning for...
  Northern Benton County in central Minnesota...
  North central Stearns County in central Minnesota...
  Southern Morrison County in central Minnesota...

* Until 715 PM CDT.

* At 626 PM CDT, a severe thunderstorm was located over Bowlus, or 12
  miles south of Little Falls, moving northeast at 45 mph.

  HAZARD...Golf ball size hail and 60 mph wind gusts.

  SOURCE...Radar indicated.

  IMPACT...People and animals outdoors will be injured. Expect hail 
           damage to roofs, siding, windows, and vehicles. Expect 
           wind damage to roofs, siding, and trees.

* This severe thunderstorm will be near...
  Royalton around 635 PM CDT.

Other locations in the path of this severe thunderstorm include
Pierz.

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 4598 9381 4598 9377 4578 9377 4571 9449
      4585 9458 4609 9381
TIME...MOT...LOC 2326Z 247DEG 37KT 4580 9443 

THUNDERSTORM DAMAGE THREAT...CONSIDERABLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

JRB

2 follow-up statements

443 
WWUS53 KMPX 162338
SVSMPX

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

MNC009-097-145-170015-
/O.CON.KMPX.SV.W.0115.000000T0000Z-210917T0015Z/
Benton MN-Stearns MN-Morrison MN-
638 PM CDT Thu Sep 16 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 715 PM CDT
FOR NORTHERN BENTON...NORTH CENTRAL STEARNS AND SOUTHERN MORRISON
COUNTIES...

At 637 PM CDT, a severe thunderstorm was located over Royalton, or 
10 miles southeast of Little Falls, moving northeast at 45 mph.

HAZARD...Two inch hail and 60 mph wind gusts.

SOURCE...Radar indicated.

IMPACT...People and animals outdoors will be injured. Expect hail 
         damage to roofs, siding, windows, and vehicles. Expect wind 
         damage to roofs, siding, and trees.

Locations impacted include...
  Pierz.

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.

&&

LAT...LON 4598 9381 4598 9377 4578 9377 4572 9441
      4587 9452 4609 9381
TIME...MOT...LOC 2337Z 247DEG 37KT 4585 9428 

THUNDERSTORM DAMAGE THREAT...CONSIDERABLE
HAIL THREAT...OBSERVED
MAX HAIL SIZE...2.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

BPH

299 
WWUS53 KMPX 170014
SVSMPX

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

MNC009-097-145-170023-
/O.EXP.KMPX.SV.W.0115.000000T0000Z-210917T0015Z/
Benton MN-Stearns MN-Morrison MN-
714 PM CDT Thu Sep 16 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHERN BENTON...NORTH
CENTRAL STEARNS AND SOUTHERN MORRISON COUNTIES WILL EXPIRE AT 715 PM
CDT...
        
The storm which prompted the warning has moved out of the area.
Therefore, the warning will be allowed to expire.

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

A Severe Thunderstorm Watch remains in effect until 200 AM CDT for
central Minnesota.

Remember, a Tornado Warning still remains in effect for southeastern 
Morrison county.

LAT...LON 4598 9381 4598 9377 4578 9377 4572 9441
      4587 9452 4609 9381
TIME...MOT...LOC 0013Z 247DEG 37KT 4599 9381 

$$

BPH

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 16, 5:45 PM CDT	Tornado Warning	MPX	Morrison, Todd	33 min
Sep 16, 6:14 PM CDT	Special Weather Statement	MPX	Morrison	31 min
Sep 16, 6:25 PM CDT	Severe Thunderstorm Warning	MPX	Morrison	35 min
Sep 16, 6:30 PM CDT	Severe Thunderstorm Warning	MPX	Chippewa, Kandiyohi, Swift	45 min
Sep 16, 6:32 PM CDT	Special Weather Statement	MPX	Stearns	43 min
Sep 16, 6:32 PM CDT	Tornado Warning	MPX	Mille Lacs, Morrison	43 min
Sep 16, 6:40 PM CDT	Severe Thunderstorm Warning	MPX	Chippewa, Lac qui Parle, Renville, Yellow Medicine	35 min
Sep 16, 6:48 PM CDT	Severe Thunderstorm Warning	MPX	Stearns	42 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.