Alert archive / Minnesota / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 127, NWS Twin Cities, MN

September 17, 20214 counties in Minnesota

NWS Twin Cities, MN issued this severe thunderstorm warning at Sep 17, 2021, 2:29 AM CDT for 4 counties in Minnesota. It was in force for 16 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 17, 2021, 2:29 AM CDT (07:29 UTC)
Expired: Sep 17, 2021, 2:45 AM CDT
In force: 16 min
Issued by: NWS Twin Cities, MN
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Carver County, MN, McLeod County, MN, Scott County, MN, Sibley County, MN

The radar

The Minneapolis radar (KMPX), 35 km from the middle of the area, began a volume at 07:32 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 nearest sounding before it

Aberdeen, SD (KABR), launched 00:00Z, 7.5 hours before the alert went out and 351 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: 1789 m above ground
0-6 km bulk shear: 75 kt
0-1 km storm-relative helicity: -170 m²/s²
0-3 km storm-relative helicity: 116 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

633 
WUUS53 KMPX 170729
SVRMPX
MNC019-085-139-143-170745-
/O.NEW.KMPX.SV.W.0127.210917T0729Z-210917T0745Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Twin Cities/Chanhassen MN
229 AM CDT Fri Sep 17 2021

The National Weather Service in the Twin Cities has issued a

* Severe Thunderstorm Warning for...
  Eastern Sibley County in central Minnesota...
  West central Scott County in east central Minnesota...
  Southeastern McLeod County in central Minnesota...
  Carver County in east central Minnesota...

* Until 245 AM CDT.

* At 228 AM CDT, severe thunderstorms were located along a line
  extending from near Glencoe to near Arlington, moving northeast at
  70 mph. This storm has a history of producing 60mph wind gusts.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

  IMPACT...Expect damage to roofs, siding, and trees.

* Severe thunderstorms will be near...
  Belle Plaine and Norwood Young America around 240 AM CDT.
  Waconia, Jordan, Watertown, St. Bonifacius and Mayer around 245 AM 
  CDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4446 9410 4468 9430 4498 9387 4498 9382
      4470 9359
TIME...MOT...LOC 0728Z 229DEG 60KT 4471 9418 4455 9405 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

TDH

2 follow-up statements

818 
WWUS53 KMPX 170739
SVSMPX

Severe Weather Statement
National Weather Service Twin Cities/Chanhassen MN
239 AM CDT Fri Sep 17 2021

MNC019-085-139-143-170745-
/O.CON.KMPX.SV.W.0127.000000T0000Z-210917T0745Z/
Sibley MN-Scott MN-McLeod MN-Carver MN-
239 AM CDT Fri Sep 17 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 245 AM CDT
FOR NORTHEASTERN SIBLEY...WEST CENTRAL SCOTT...EAST CENTRAL MCLEOD
AND CARVER COUNTIES...

At 239 AM CDT, severe thunderstorms were located along a line
extending from 5 miles south of Lester Prairie to 5 miles southeast
of Green Isle, moving northeast at 70 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

IMPACT...Expect damage to roofs, siding, and trees.

Locations impacted include...
  Waconia, Jordan, Watertown, Mayer, Cologne, Carver, St. Bonifacius 
  and Minnetrista.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4452 9397 4475 9420 4498 9387 4498 9382
      4470 9359
TIME...MOT...LOC 0739Z 229DEG 60KT 4480 9403 4464 9390 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

TDH

078 
WWUS53 KMPX 170755
SVSMPX

Severe Weather Statement
National Weather Service Twin Cities/Chanhassen MN
255 AM CDT Fri Sep 17 2021

MNC019-085-139-143-170804-
/O.EXP.KMPX.SV.W.0127.000000T0000Z-210917T0745Z/
Sibley MN-Scott MN-McLeod MN-Carver MN-
255 AM CDT Fri Sep 17 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN SIBLEY...
SOUTHWESTERN SCOTT...EAST CENTRAL MCLEOD AND CARVER COUNTIES HAS
EXPIRED...
    
The storms which prompted the warning have moved out of the area.
Therefore, the warning has been allowed to expire.


LAT...LON 4452 9397 4475 9420 4498 9387 4498 9382
      4470 9359
TIME...MOT...LOC 0754Z 229DEG 60KT 4480 9403 4464 9390 

$$

TDH

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, 7:30 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, 2:34 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.