Alert archive / Minnesota / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 24, NWS Twin Cities, MN

June 21, 2020Martin County, Watonwan County, Minnesota

NWS Twin Cities, MN issued this severe thunderstorm warning at Jun 21, 2020, 3:59 PM CDT for Martin County, Watonwan County, Minnesota. It was in force for 46 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: Jun 21, 2020, 3:59 PM CDT (20:59 UTC)
Expired: Jun 21, 2020, 4:45 PM CDT
In force: 46 min
Issued by: NWS Twin Cities, MN
Area: Storm-based polygon
Hail: 1.25 in
Wind: 50.0 mph

Counties Martin County, MN, Watonwan County, MN

The radar

The Minneapolis radar (KMPX), 140 km from the middle of the area, began a volume at 21:01 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
Jun 21, 4:05 PM CDT	HAIL 1	2 S Odin, MN	LARGER HAIL REPORTED TO THE NORTH, WITH SOME CROP DAMAGE REPORTED. EXTENT UNKNOWN.

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
Jun 21, 3:55 PM CDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Minneapolis, MN (KMPX), launched 12:00Z, 9.0 hours before the alert went out and 138 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: 44 J/kg
Mixed-layer CIN: -127 J/kg
Mixed-layer LCL: 1247 m above ground
0-6 km bulk shear: 29 kt
0-1 km storm-relative helicity: 125 m²/s²
0-3 km storm-relative helicity: 186 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

011 
WUUS53 KMPX 212059
SVRMPX
MNC091-165-212145-
/O.NEW.KMPX.SV.W.0024.200621T2059Z-200621T2145Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Twin Cities/Chanhassen MN
359 PM CDT Sun Jun 21 2020

The National Weather Service in The Twin Cities has issued a

* Severe Thunderstorm Warning for...
  North central Martin County in south central Minnesota...
  Southwestern Watonwan County in south central Minnesota...

* Until 445 PM CDT.

* At 359 PM CDT, a severe thunderstorm was located near Butterfield,
  or 17 miles east of Windom, moving northeast at 20 mph.

  HAZARD...Half dollar size hail.

  SOURCE...Radar indicated.

  IMPACT...Damage to vehicles is expected.

* Locations impacted include...
  St. James, South Branch, Ormsby, Odin and Echols. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Prepare immediately for large hail and deadly cloud to ground
lightning. Seek shelter inside a well-built structure. Stay away from
windows.

Large hail and damaging winds and continuous cloud to ground
lightning is occurring with this storm. Move indoors immediately.
Lightning is one of nature's leading killers. Remember, if you can
hear thunder, you are close enough to be struck by lightning.

&&

LAT...LON 4380 9475 4388 9482 4402 9461 4386 9446
TIME...MOT...LOC 2059Z 236DEG 17KT 4386 9476 

HAIL...1.25IN
WIND...<50MPH
 
$$

ETA

2 follow-up statements

885 
WWUS53 KMPX 212116
SVSMPX

Severe Weather Statement
National Weather Service Twin Cities/Chanhassen MN
416 PM CDT Sun Jun 21 2020

MNC091-212126-
/O.CAN.KMPX.SV.W.0024.000000T0000Z-200621T2145Z/
Martin MN-
416 PM CDT Sun Jun 21 2020

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

A Severe Thunderstorm Watch remains in effect until 1100 PM CDT for
south central Minnesota.

LAT...LON 4392 9475 4402 9461 4386 9446 4384 9453
      4384 9464
TIME...MOT...LOC 2116Z 236DEG 17KT 4391 9467 

$$

MNC165-212145-
/O.CON.KMPX.SV.W.0024.000000T0000Z-200621T2145Z/
Watonwan MN-
416 PM CDT Sun Jun 21 2020

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 445 PM CDT
FOR SOUTH CENTRAL WATONWAN COUNTY...

At 416 PM CDT, a severe thunderstorm was located near St. James, or
21 miles northwest of Fairmont, moving northeast at 20 mph.

HAZARD...Half dollar size hail.

SOURCE...Radar indicated.

IMPACT...Damage to vehicles is expected.

Locations impacted include...
St. James, South Branch and Echols. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Prepare immediately for large hail and deadly cloud to ground
lightning. Seek shelter inside a well-built structure. Stay away from
windows.

Continuous cloud to ground lightning is occurring with this storm.
Move indoors immediately. Lightning is one of nature's leading
killers. Remember, if you can hear thunder, you are close enough to
be struck by lightning.

&&

LAT...LON 4392 9475 4402 9461 4386 9446 4384 9453
      4384 9464
TIME...MOT...LOC 2116Z 236DEG 17KT 4391 9467 

HAIL...1.25IN
WIND...<50MPH
 
$$

ETA

408 
WWUS53 KMPX 212138
SVSMPX

Severe Weather Statement
National Weather Service Twin Cities/Chanhassen MN
438 PM CDT Sun Jun 21 2020

MNC165-212148-
/O.EXP.KMPX.SV.W.0024.000000T0000Z-200621T2145Z/
Watonwan MN-
438 PM CDT Sun Jun 21 2020

...THE SEVERE THUNDERSTORM WARNING FOR SOUTH CENTRAL WATONWAN COUNTY
WILL EXPIRE AT 445 PM CDT...
        
The storm which prompted the warning has moved out of the area.
Therefore, the warning will be allowed to expire.  However heavy rain
is still possible with this thunderstorm.

A Severe Thunderstorm Watch remains in effect until 1100 PM CDT for
south central Minnesota.

LAT...LON 4392 9475 4402 9461 4386 9446 4384 9453
      4384 9464
TIME...MOT...LOC 2138Z 236DEG 17KT 4396 9456 

$$

ETA

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 20, 10:45 PM CDT	Special Weather Statement	MPX	Lac qui Parle	30 min
Jun 21, 2:26 PM CDT	Special Weather Statement	MPX	Brown	34 min
Jun 21, 2:42 PM CDT	Special Weather Statement	MPX	Scott	33 min
Jun 21, 2:54 PM CDT	Special Weather Statement	MPX	Nicollet	36 min
Jun 21, 3:02 PM CDT	Special Weather Statement	MPX	Brown	73 min
Jun 21, 3:16 PM CDT	Special Weather Statement	MPX	Sibley	44 min
Jun 21, 3:41 PM CDT	Special Weather Statement	MPX	Scott	49 min
Jun 21, 4:14 PM CDT	Severe Thunderstorm Warning	MPX	Blue Earth, Le Sueur, Nicollet	20 min
Jun 21, 4:28 PM CDT	Severe Thunderstorm Warning	MPX	Blue Earth, Watonwan	32 min
Jun 21, 5:12 PM CDT	Severe Thunderstorm Warning	MPX	Faribault	33 min
Jun 21, 5:15 PM CDT	Special Weather Statement	MPX	Martin	45 min
Jun 21, 5:20 PM CDT	Special Weather Statement	MPX	Waseca	40 min
Jun 21, 5:52 PM CDT	Special Weather Statement	MPX	Faribault	38 min
Jun 21, 5:57 PM CDT	Special Weather Statement	MPX	Blue Earth, Watonwan	33 min
Jun 21, 6:07 PM CDT	Special Weather Statement	MPX	Freeborn	38 min
Jun 21, 6:44 PM CDT	Special Weather Statement	MPX	Freeborn	31 min

Nearby

Severe Thunderstorm Warnings in Minnesota, 2020 Every severe thunderstorm warning in 2020

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.