Alert archive / Minnesota / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 43, NWS Twin Cities, MN

July 11, 2020Swift County, Minnesota

NWS Twin Cities, MN issued this severe thunderstorm warning at Jul 11, 2020, 11:17 AM CDT for Swift County, Minnesota. It was in force for 43 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: Jul 11, 2020, 11:17 AM CDT (16:17 UTC)
Expired: Jul 11, 2020, 12:00 PM CDT
In force: 43 min
Issued by: NWS Twin Cities, MN
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

County Swift County, MN

The radar

The Minneapolis radar (KMPX), 163 km from the middle of the area, began a volume at 16:18 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
Jul 11, 11:49 AM CDT	TSTM WND DMG	De Graff, MN	REPORTED AT US HWY 12 AND SWIFT COUNTY ROAD 31. MEASURED 5.4 INCH DIAMETER TREE BRANCH SNAPPED OFF.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Minneapolis, MN (KMPX), launched 12:00Z, 4.3 hours before the alert went out and 160 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: 52 J/kg
Mixed-layer CIN: -178 J/kg
Mixed-layer LCL: 1331 m above ground
0-6 km bulk shear: 36 kt
0-1 km storm-relative helicity: 47 m²/s²
0-3 km storm-relative helicity: 69 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.3

Open this sounding in Storm Lab

The text

As transmitted.

083 
WUUS53 KMPX 111617
SVRMPX
MNC151-111700-
/O.NEW.KMPX.SV.W.0043.200711T1617Z-200711T1700Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Twin Cities/Chanhassen MN
1117 AM CDT Sat Jul 11 2020

The National Weather Service in The Twin Cities has issued a

* Severe Thunderstorm Warning for...
  Eastern Swift County in west central Minnesota...

* Until noon CDT.

* At 1116 AM CDT, a severe thunderstorm was located near Benson, or
  19 miles southeast of Morris, moving east at 30 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...
  Benson, Kerkhoven, Murdock, Lake Hassel, Clontarf, De Graff,
  Danvers and Benson Airport.

This includes U.S. Highway 12 between mile markers 35 and 63.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

To report severe weather, contact your nearest law enforcement
agency. They will send your report to the National Weather Service
office in The Twin Cities.

&&

LAT...LON 4542 9569 4542 9561 4534 9525 4516 9525
      4515 9544 4531 9581
TIME...MOT...LOC 1616Z 290DEG 26KT 4536 9567 

HAIL...1.00IN
WIND...60MPH
 
$$

CTG

4 follow-up statements

861 
WWUS53 KMPX 111627
SVSMPX

Severe Weather Statement
National Weather Service Twin Cities/Chanhassen MN
1127 AM CDT Sat Jul 11 2020

MNC151-111700-
/O.CON.KMPX.SV.W.0043.000000T0000Z-200711T1700Z/
Swift MN-
1127 AM CDT Sat Jul 11 2020

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL NOON CDT FOR
EASTERN SWIFT COUNTY...

At 1126 AM CDT, a severe thunderstorm was located over Benson, or 24
miles southeast of Morris, moving east at 30 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...
Benson, Kerkhoven, Murdock, Lake Hassel, Clontarf, De Graff and
Benson Airport.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

To report severe weather contact your nearest law enforcement agency.
They will send your report to the National Weather Service office in
The Twin Cities.

&&

LAT...LON 4538 9567 4541 9557 4534 9525 4516 9525
      4515 9544 4528 9574
TIME...MOT...LOC 1626Z 290DEG 26KT 4533 9557 

HAIL...1.00IN
WIND...60MPH
 
$$

CTG

155 
WWUS53 KMPX 111640
SVSMPX

Severe Weather Statement
National Weather Service Twin Cities/Chanhassen MN
1140 AM CDT Sat Jul 11 2020

MNC151-111700-
/O.CON.KMPX.SV.W.0043.000000T0000Z-200711T1700Z/
Swift MN-
1140 AM CDT Sat Jul 11 2020

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL NOON CDT FOR
EASTERN SWIFT COUNTY...

At 1140 AM CDT, a severe thunderstorm was located near Murdock, or 22
miles northwest of Willmar, moving east at 30 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...
Benson, Kerkhoven, Murdock and De Graff. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

To report severe weather contact your nearest law enforcement agency.
They will send your report to the National Weather Service office in
The Twin Cities.

&&

LAT...LON 4533 9560 4536 9552 4533 9525 4516 9525
      4515 9544 4526 9569
TIME...MOT...LOC 1640Z 290DEG 26KT 4529 9543 

HAIL...1.00IN
WIND...60MPH
 
$$

CTG

029 
WWUS53 KMPX 111651
SVSMPX

Severe Weather Statement
National Weather Service Twin Cities/Chanhassen MN
1151 AM CDT Sat Jul 11 2020

MNC151-111700-
/O.CON.KMPX.SV.W.0043.000000T0000Z-200711T1700Z/
Swift MN-
1151 AM CDT Sat Jul 11 2020

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL NOON CDT FOR
SOUTHEASTERN SWIFT COUNTY...

At 1151 AM CDT, a severe thunderstorm was located near Murdock, or 16
miles northwest of Willmar, moving east at 30 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...
Kerkhoven, Murdock and De Graff. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

To report severe weather contact your nearest law enforcement agency.
They will send your report to the National Weather Service office in
The Twin Cities.

&&

LAT...LON 4533 9545 4531 9525 4516 9525 4515 9544
      4522 9560
TIME...MOT...LOC 1651Z 290DEG 26KT 4526 9532 

HAIL...1.00IN
WIND...60MPH
 
$$

CTG

531 
WWUS53 KMPX 111657
SVSMPX

Severe Weather Statement
National Weather Service Twin Cities/Chanhassen MN
1157 AM CDT Sat Jul 11 2020

MNC151-111707-
/O.EXP.KMPX.SV.W.0043.000000T0000Z-200711T1700Z/
Swift MN-
1157 AM CDT Sat Jul 11 2020

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN SWIFT COUNTY WILL
EXPIRE AT NOON 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.  However small hail
is still possible with this thunderstorm.

To report severe weather, contact your nearest law enforcement
agency. They will relay your report to the National Weather Service
The Twin Cities.

LAT...LON 4533 9545 4531 9525 4516 9525 4515 9544
      4522 9560
TIME...MOT...LOC 1657Z 290DEG 26KT 4525 9528 

$$

CTG

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 11, 5:32 AM CDT	Severe Thunderstorm Warning	MPX	Steele	28 min
Jul 11, 10:43 AM CDT	Special Weather Statement	MPX	Douglas, Pope, Stevens	47 min
Jul 11, 11:34 AM CDT	Special Weather Statement	MPX	Todd	56 min
Jul 11, 12:00 PM CDT	Special Weather Statement	MPX	Kandiyohi	45 min
Jul 11, 12:32 PM CDT	Severe Thunderstorm Warning	MPX	Kandiyohi, Renville	58 min
Jul 11, 12:39 PM CDT	Special Weather Statement	MPX	Meeker	51 min
Jul 11, 12:57 PM CDT	Special Weather Statement	MPX	Todd	33 min
Jul 11, 1:05 PM CDT	Severe Thunderstorm Warning	MPX	McLeod, Meeker, Renville, Sibley	55 min
Jul 11, 1:20 PM CDT	Severe Thunderstorm Warning	MPX	Chippewa, Redwood, Renville, Yellow Medicine	40 min
Jul 11, 1:28 PM CDT	Severe Thunderstorm Warning	MPX	Redwood	47 min
Jul 11, 1:48 PM CDT	Severe Thunderstorm Warning	MPX	McLeod, Sibley	57 min
Jul 11, 2:01 PM CDT	Special Weather Statement	MPX	Pope	44 min
Jul 11, 2:15 PM CDT	Severe Thunderstorm Warning	MPX	Pope	45 min
Jul 11, 2:20 PM CDT	Severe Thunderstorm Warning	MPX	Martin	40 min
Jul 11, 2:23 PM CDT	Severe Thunderstorm Warning	MPX	Nicollet, Sibley	52 min
Jul 11, 2:42 PM CDT	Severe Thunderstorm Warning	MPX	Blue Earth, Brown, Nicollet	33 min
Jul 11, 2:57 PM CDT	Severe Thunderstorm Warning	MPX	Martin, Watonwan	48 min
Jul 11, 3:03 PM CDT	Severe Thunderstorm Warning	MPX	Blue Earth, Brown, Le Sueur, Nicollet	42 min
Jul 11, 3:10 PM CDT	Tornado Warning	MPX	Blue Earth, Nicollet	20 min
Jul 11, 3:26 PM CDT	Severe Thunderstorm Warning	MPX	Faribault, Martin	49 min
Jul 11, 3:32 PM CDT	Severe Thunderstorm Warning	MPX	Blue Earth, Faribault, Freeborn, Steele, Waseca	43 min
Jul 11, 4:05 PM CDT	Severe Thunderstorm Warning	MPX	Freeborn, Steele, Waseca	55 min
Jul 11, 4:17 PM CDT	Special Weather Statement	MPX	Faribault	58 min
Jul 11, 4:35 PM CDT	Severe Thunderstorm Warning	MPX	Faribault, Freeborn	25 min
Jul 11, 6:16 PM CDT	Special Weather Statement	MPX	Hennepin	59 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.