Alert archive / Minnesota / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 141, NWS Sioux Falls, SD

August 28, 2021Nobles County, Rock County, Minnesota

NWS Sioux Falls, SD issued this severe thunderstorm warning at Aug 28, 2021, 8:06 PM CDT for Nobles County, Rock County, Minnesota. It was in force for 54 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 28, 2021, 8:06 PM CDT (01:06 UTC)
Expired: Aug 28, 2021, 9:00 PM CDT
In force: 54 min
Issued by: NWS Sioux Falls, SD
Area: Storm-based polygon
Damage threat: Considerable
Hail: 2.5 in
Wind: 60.0 mph

Counties Nobles County, MN, Rock County, MN

The radar

The Sioux Falls radar (KFSD), 45 km from the middle of the area, began a volume at 01:08 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 28, 8:08 PM CDT	HAIL 1.75	Hills, MN	REPORT VIA SOCIAL MEDIA.
Aug 28, 8:31 PM CDT	HAIL 0.5	1 Ssw Luverne, MN	REPORT FROM MPING: HALF-INCH (0.50 IN.).

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
Aug 28, 3:44 PM CDT	Tornado Watch	SPC	5 hr
Aug 28, 3:57 PM CDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Aberdeen, SD (KABR), launched 00:00Z, 1.1 hours before the alert went out and 230 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: 143 J/kg
Mixed-layer CIN: -122 J/kg
Mixed-layer LCL: 1242 m above ground
0-6 km bulk shear: 71 kt
0-1 km storm-relative helicity: -15 m²/s²
0-3 km storm-relative helicity: 268 m²/s²
Significant tornado parameter: -0.0
Supercell composite: -0.2

Open this sounding in Storm Lab

The text

As transmitted.

055 
WUUS53 KFSD 290106
SVRFSD
MNC105-133-290200-
/O.NEW.KFSD.SV.W.0141.210829T0106Z-210829T0200Z/

BULLETIN - EAS ACTIVATION REQUESTED
Severe Thunderstorm Warning
National Weather Service Sioux Falls SD
806 PM CDT Sat Aug 28 2021

The National Weather Service in Sioux Falls has issued a

* Severe Thunderstorm Warning for...
  Rock County in southwestern Minnesota...
  Southwestern Nobles County in southwestern Minnesota...

* Until 900 PM CDT.

* At 805 PM CDT, a severe thunderstorm was located over Hills, or 9
  miles northwest of Rock Rapids, moving northeast at 20 mph.

  HAZARD...Tennis ball size hail and 60 mph wind gusts.

  SOURCE...Trained weather spotters reported tennis ball size hail 
           in Larchwood around 750 pm.

  IMPACT...People and animals outdoors will be injured. Expect hail 
           damage to roofs, siding, windows, and vehicles. Expect 
           wind damage to roofs, siding, and trees.

* This severe thunderstorm will be near...
  Beaver Creek around 820 PM CDT.

Other locations in the path of this severe thunderstorm include
Luverne and Blue Mounds State Park.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Tornado Watch remains in effect until 900 PM CDT for southwestern
Minnesota.

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

A Tornado Watch remains in effect until 900 PM CDT for southwestern
Minnesota.

&&

LAT...LON 4358 9577 4350 9601 4350 9645 4353 9646
      4355 9646 4382 9631
TIME...MOT...LOC 0105Z 219DEG 19KT 4350 9633 

THUNDERSTORM DAMAGE THREAT...CONSIDERABLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...2.50 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

Kalin

2 follow-up statements

370 
WWUS53 KFSD 290124
SVSFSD

Severe Weather Statement
National Weather Service Sioux Falls SD
824 PM CDT Sat Aug 28 2021

MNC105-133-290200-
/O.CON.KFSD.SV.W.0141.000000T0000Z-210829T0200Z/
Rock MN-Nobles MN-
824 PM CDT Sat Aug 28 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 900 PM CDT
FOR ROCK AND SOUTHWESTERN NOBLES COUNTIES...

At 824 PM CDT, a severe thunderstorm was located near Luverne, moving
northeast at 25 mph.

HAZARD...Golf ball size hail and 60 mph wind gusts.

SOURCE...Trained weather spotters reported golf ball size hail in 
         Hills at 810 pm .

IMPACT...People and animals outdoors will be injured. Expect hail 
         damage to roofs, siding, windows, and vehicles. Expect wind 
         damage to roofs, siding, and trees.

Locations impacted include...
  Luverne, Blue Mounds State Park and Hardwick.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Tornado Watch remains in effect until 900 PM CDT for southwestern
Minnesota.

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

&&

LAT...LON 4358 9577 4350 9601 4355 9646 4382 9631
TIME...MOT...LOC 0124Z 214DEG 22KT 4360 9624 

THUNDERSTORM DAMAGE THREAT...CONSIDERABLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

Kalin

198 
WWUS53 KFSD 290148
SVSFSD

Severe Weather Statement
National Weather Service Sioux Falls SD
848 PM CDT Sat Aug 28 2021

MNC105-133-290200-
/O.CON.KFSD.SV.W.0141.000000T0000Z-210829T0200Z/
Rock MN-Nobles MN-
848 PM CDT Sat Aug 28 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 900 PM CDT
FOR ROCK AND SOUTHWESTERN NOBLES COUNTIES...

At 847 PM CDT, severe thunderstorms were located along a line
extending from Hardwick to Hills, moving east at 30 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

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

Locations impacted include...
  Luverne, Hardwick, Blue Mounds State Park, Adrian and Ellsworth.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Tornado Watch remains in effect until 900 PM CDT for southwestern
Minnesota.

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

&&

LAT...LON 4358 9577 4350 9601 4355 9646 4382 9631
TIME...MOT...LOC 0147Z 280DEG 27KT 4375 9621 4352 9639 

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

$$

Kalin

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 28, 7:00 PM CDT	Severe Thunderstorm Warning Considerable damage threat	FSD	Lincoln, Lyon, Murray, Pipestone	45 min
Aug 28, 7:23 PM CDT	Severe Thunderstorm Warning Considerable damage threat	FSD	Rock	52 min
Aug 28, 7:34 PM CDT	Severe Thunderstorm Warning	FSD	Lyon, Murray, Pipestone	56 min
Aug 28, 7:48 PM CDT	Severe Thunderstorm Warning	FSD	Rock	31 min
Aug 28, 8:03 PM CDT	Flash Flood Warning	FSD	Murray, Pipestone	6 hr
Aug 28, 8:17 PM CDT	Severe Thunderstorm Warning Considerable damage threat	FSD	Cottonwood, Lyon, Murray	58 min
Aug 28, 8:52 PM CDT	Severe Thunderstorm Warning	FSD	Murray, Nobles, Rock	23 min
Aug 28, 9:13 PM CDT	Severe Thunderstorm Warning	FSD	Jackson, Nobles, Rock	47 min
Aug 28, 9:29 PM CDT	Flash Flood Warning	FSD	Murray, Nobles, Pipestone, Rock	3 hr
Aug 28, 10:04 PM CDT	Flash Flood Warning	FSD	Cottonwood, Jackson, Murray, Nobles	4 hr
Aug 28, 10:24 PM CDT	Flash Flood Warning	FSD	Cottonwood, Jackson	5 hr

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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.