Alert archive / Minnesota / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 90, NWS Twin Cities, MN

August 24, 2021McLeod County, Sibley County, Minnesota

NWS Twin Cities, MN issued this severe thunderstorm warning at Aug 24, 2021, 8:39 AM CDT for McLeod County, Sibley County, Minnesota. It was in force for 21 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: Aug 24, 2021, 8:39 AM CDT (13:39 UTC)
Expired: Aug 24, 2021, 9:00 AM CDT
In force: 21 min
Issued by: NWS Twin Cities, MN
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties McLeod County, MN, Sibley County, MN

The radar

The Minneapolis radar (KMPX), 45 km from the middle of the area, began a volume at 13:39 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Aug 24, 2:17 AM CDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Minneapolis, MN (KMPX), launched 12:00Z, 1.7 hours before the alert went out and 42 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: 1192 J/kg
Mixed-layer CIN: -180 J/kg
Mixed-layer LCL: 1234 m above ground
0-6 km bulk shear: 51 kt
0-1 km storm-relative helicity: 141 m²/s²
0-3 km storm-relative helicity: 178 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 6.9

Open this sounding in Storm Lab

The text

As transmitted.

758 
WUUS53 KMPX 241339
SVRMPX
MNC085-143-241400-
/O.NEW.KMPX.SV.W.0090.210824T1339Z-210824T1400Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Twin Cities/Chanhassen MN
839 AM CDT Tue Aug 24 2021

The National Weather Service in the Twin Cities has issued a

* Severe Thunderstorm Warning for...
  North central Sibley County in central Minnesota...
  East central McLeod County in central Minnesota...

* Until 900 AM CDT.

* At 839 AM CDT, a severe thunderstorm was located 6 miles northwest
  of Arlington, or 18 miles southeast of Hutchinson, moving northeast
  at 50 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.

* This severe thunderstorm will be near...
  Green Isle around 850 AM CDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4460 9423 4465 9426 4479 9405 4474 9400
      4472 9401 4472 9398 4467 9393
TIME...MOT...LOC 1339Z 235DEG 44KT 4466 9418 

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

$$

TDH

2 follow-up statements

992 
WWUS53 KMPX 241348
SVSMPX

Severe Weather Statement
National Weather Service Twin Cities/Chanhassen MN
848 AM CDT Tue Aug 24 2021

MNC085-143-241400-
/O.CON.KMPX.SV.W.0090.000000T0000Z-210824T1400Z/
Sibley MN-McLeod MN-
848 AM CDT Tue Aug 24 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 900 AM CDT
FOR NORTH CENTRAL SIBLEY AND EAST CENTRAL MCLEOD COUNTIES...

At 848 AM CDT, a severe thunderstorm was located near Green Isle, or
19 miles southeast of Hutchinson, moving northeast at 40 mph.

HAZARD...Quarter size hail.

SOURCE...Radar indicated.

IMPACT...Damage to vehicles is expected.

This severe thunderstorm will remain over mainly rural areas of north
central Sibley and east central McLeod Counties, including the
following locations... Plato and Glencoe Airport.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4463 9416 4467 9421 4479 9405 4474 9400
      4472 9401 4472 9398 4467 9393
TIME...MOT...LOC 1348Z 239DEG 37KT 4469 9409 

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

$$

TDH

790 
WWUS53 KMPX 241352
SVSMPX

Severe Weather Statement
National Weather Service Twin Cities/Chanhassen MN
852 AM CDT Tue Aug 24 2021

MNC085-143-241402-
/O.EXP.KMPX.SV.W.0090.000000T0000Z-210824T1400Z/
Sibley MN-McLeod MN-
852 AM CDT Tue Aug 24 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTH CENTRAL SIBLEY AND EAST
CENTRAL MCLEOD COUNTIES WILL EXPIRE AT 900 AM CDT...
                
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning will be allowed to expire.

A Severe Thunderstorm Watch remains in effect until 900 AM CDT for
central and east central Minnesota.

LAT...LON 4463 9416 4467 9421 4479 9405 4474 9400
      4472 9401 4472 9398 4467 9393
TIME...MOT...LOC 1352Z 235DEG 44KT 4472 9404 

$$

TDH

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 24, 2:55 AM CDT	Severe Thunderstorm Warning	MPX	Carver, Le Sueur, Scott, Sibley	35 min
Aug 24, 3:16 AM CDT	Special Weather Statement	MPX	Chippewa, Douglas, Lac qui Parle, Pope, Stevens, Swift	29 min
Aug 24, 3:28 AM CDT	Severe Thunderstorm Warning	MPX	Dakota, Scott	32 min
Aug 24, 3:32 AM CDT	Severe Thunderstorm Warning	MPX	Douglas, Pope, Stevens, Swift	43 min
Aug 24, 3:48 AM CDT	Severe Thunderstorm Warning	MPX	Dakota, Rice	42 min
Aug 24, 3:52 AM CDT	Severe Thunderstorm Warning	MPX	Chippewa, Lac qui Parle, Swift, Yellow Medicine	38 min
Aug 24, 4:08 AM CDT	Severe Thunderstorm Warning	MPX	Kandiyohi, Pope, Stearns, Stevens, Swift	52 min
Aug 24, 4:30 AM CDT	Special Weather Statement	MPX	Chippewa, Kandiyohi, Renville, Swift	45 min
Aug 24, 4:44 AM CDT	Severe Thunderstorm Warning Considerable damage threat	MPX	Kandiyohi, McLeod, Meeker, Stearns	46 min
Aug 24, 4:48 AM CDT	Severe Thunderstorm Warning	MPX	Chippewa, Kandiyohi, Renville	42 min
Aug 24, 5:05 AM CDT	Special Weather Statement	MPX	Goodhue	40 min
Aug 24, 5:27 AM CDT	Severe Thunderstorm Warning	MPX	Kandiyohi, McLeod, Meeker, Renville, Wright	33 min
Aug 24, 5:29 AM CDT	Severe Thunderstorm Warning	MPX	Meeker, Sherburne, Stearns, Wright	46 min
Aug 24, 5:45 AM CDT	Special Weather Statement	MPX	Brown, Nicollet, Redwood, Renville, Sibley	30 min
Aug 24, 5:57 AM CDT	Severe Thunderstorm Warning	MPX	Anoka, Hennepin, Sherburne, Wright	33 min
Aug 24, 5:59 AM CDT	Severe Thunderstorm Warning	MPX	Carver, McLeod, Renville, Sibley	31 min
Aug 24, 6:19 AM CDT	Special Weather Statement	MPX	Carver, Le Sueur, Nicollet, Rice, Scott, Sibley	26 min
Aug 24, 6:25 AM CDT	Severe Thunderstorm Warning	MPX	Anoka, Chisago, Dakota, Hennepin, Ramsey, Washington	35 min
Aug 24, 6:53 AM CDT	Special Weather Statement	MPX	Dakota, Goodhue, Le Sueur, Rice, Scott	67 min
Aug 24, 6:57 AM CDT	Special Weather Statement	MPX	Brown	33 min
Aug 24, 7:00 AM CDT	Special Weather Statement	MPX	Ramsey, Washington	30 min
Aug 24, 7:23 AM CDT	Special Weather Statement	MPX	Nicollet, Sibley	37 min
Aug 24, 7:59 AM CDT	Special Weather Statement	MPX	Le Sueur, Sibley	31 min
Aug 24, 8:01 AM CDT	Special Weather Statement	MPX	Wabasha	29 min
Aug 24, 8:04 AM CDT	Special Weather Statement	MPX	Redwood	26 min
Aug 24, 8:30 AM CDT	Special Weather Statement	MPX	Redwood	30 min
Aug 24, 9:03 AM CDT	Special Weather Statement	MPX	Dakota	27 min
Aug 24, 9:41 AM CDT	Special Weather Statement	MPX	Brown, Nicollet, Watonwan	49 min
Aug 24, 10:23 AM CDT	Special Weather Statement	MPX	Martin	37 min
Aug 24, 10:35 AM CDT	Special Weather Statement	MPX	Blue Earth	25 min
Aug 24, 11:16 AM CDT	Special Weather Statement	MPX	Faribault, Martin	44 min
Aug 24, 12:20 PM CDT	Special Weather Statement	MPX	Freeborn	40 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.