Alert archive / Minnesota / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 103, NWS Sioux Falls, SD

August 24, 2021Jackson County, Nobles County, Minnesota; Dickinson County, Osceola County, Iowa

NWS Sioux Falls, SD issued this severe thunderstorm warning at Aug 24, 2021, 10:44 AM CDT for Jackson County, Nobles County, Minnesota; Dickinson County, Osceola County, Iowa. It was in force for 30 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: Aug 24, 2021, 10:44 AM CDT (15:44 UTC)
Expired: Aug 24, 2021, 11:14 AM CDT
In force: 30 min
Issued by: NWS Sioux Falls, SD
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Dickinson County, IA, Osceola County, IA, Jackson County, MN, Nobles County, MN

The radar

The Sioux Falls radar (KFSD), 114 km from the middle of the area, began a volume at 15:46 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
Aug 24, 10:46 AM CDT	HAIL 0.7	8 E Round Lake, MN	DICKENSON COUNTY EM REPORTED DIME TO NICKLE SIZED HAIL NEAR SIOUX VALLEY, MN (ABOUT 6 MILES NORTH OF LAKEPARK IA).
Aug 24, 11:08 AM CDT	HAIL 0.88	6 Sw Jackson, MN

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, 3.7 hours before the alert went out and 199 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.

521 
WUUS53 KFSD 241544
SVRFSD
IAC059-143-MNC063-105-241630-
/O.NEW.KFSD.SV.W.0103.210824T1544Z-210824T1630Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Sioux Falls SD
1044 AM CDT Tue Aug 24 2021

The National Weather Service in Sioux Falls has issued a

* Severe Thunderstorm Warning for...
  Northeastern Osceola County in northwestern Iowa...
  Northwestern Dickinson County in northwestern Iowa...
  Western Jackson County in southwestern Minnesota...
  Southeastern Nobles County in southwestern Minnesota...

* Until 1130 AM CDT.

* At 1044 AM CDT, a severe thunderstorm was located over Round Lake,
  or 10 miles southeast of Worthington, 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.

* This severe thunderstorm will be near...
  Lake Park around 1050 AM CDT.

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

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4344 9551 4367 9549 4378 9503 4340 9502
TIME...MOT...LOC 1544Z 262DEG 27KT 4354 9543 

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

$$

BP

2 follow-up statements

754 
WWUS53 KFSD 241601
SVSFSD

Severe Weather Statement
National Weather Service Sioux Falls SD
1101 AM CDT Tue Aug 24 2021

IAC143-MNC105-241610-
/O.CAN.KFSD.SV.W.0103.000000T0000Z-210824T1630Z/
Osceola IA-Nobles MN-
1101 AM CDT Tue Aug 24 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN OSCEOLA AND
SOUTHEASTERN NOBLES COUNTIES IS CANCELLED...
    
The severe thunderstorm which prompted the warning has moved out of 
the warned area. Therefore, the warning has been cancelled.

LAT...LON 4345 9502 4350 9533 4371 9526 4378 9503
TIME...MOT...LOC 1600Z 261DEG 30KT 4357 9518 

$$

IAC059-MNC063-241630-
/O.CON.KFSD.SV.W.0103.000000T0000Z-210824T1630Z/
Dickinson IA-Jackson MN-
1101 AM CDT Tue Aug 24 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1130 AM CDT
FOR NORTH CENTRAL DICKINSON AND CENTRAL JACKSON COUNTIES...

At 1100 AM CDT, a severe thunderstorm was located 7 miles south of
Lakefield, or 10 miles west of Jackson In Jackson County, moving east
at 35 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...
Lakefield, Orleans and Kilen Woods State Park. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 4345 9502 4350 9533 4371 9526 4378 9503
TIME...MOT...LOC 1600Z 261DEG 30KT 4357 9518 

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

$$

BP

057 
WWUS53 KFSD 241614
SVSFSD

Severe Weather Statement
National Weather Service Sioux Falls SD
1114 AM CDT Tue Aug 24 2021

IAC059-MNC063-241624-
/O.CAN.KFSD.SV.W.0103.000000T0000Z-210824T1630Z/
Dickinson IA-Jackson MN-
1114 AM CDT Tue Aug 24 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTH CENTRAL DICKINSON AND
CENTRAL JACKSON COUNTIES IS CANCELLED...
        
The storm which prompted the warning has weakened below severe
limits. Therefore, the warning has been cancelled.

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

LAT...LON 4345 9502 4350 9533 4371 9526 4378 9503
TIME...MOT...LOC 1612Z 262DEG 27KT 4359 9503 

$$

BP

The office that day

Everything else NWS Sioux Falls, SD issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 24, 8:16 AM CDT	Severe Thunderstorm Warning	FSD	Cottonwood, Murray	44 min
Aug 24, 8:59 AM CDT	Severe Thunderstorm Warning	FSD	Cottonwood, Murray	61 min
Aug 24, 9:43 AM CDT	Severe Thunderstorm Warning	FSD	Nobles	47 min
Aug 24, 10:00 AM CDT	Severe Thunderstorm Warning	FSD	Cottonwood, Jackson, Nobles, Rock	45 min
Aug 24, 3:31 AM CDT	Heat Advisory	FSD	Plymouth, Woodbury	11 hr

Nearby

Severe Thunderstorm Warnings in Minnesota, 2021 Severe Thunderstorm Warnings in Iowa, 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.