Alert archive / Minnesota / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 67, NWS Aberdeen, SD

July 24, 2021Big Stone County, Traverse County, Minnesota; Roberts County, South Dakota

NWS Aberdeen, SD issued this severe thunderstorm warning at Jul 24, 2021, 12:43 AM CDT for Big Stone County, Traverse County, Minnesota; Roberts County, South Dakota. It was in force for 47 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 24, 2021, 12:43 AM CDT (05:43 UTC)
Expired: Jul 24, 2021, 1:30 AM CDT
In force: 47 min
Issued by: NWS Aberdeen, SD
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Big Stone County, MN, Traverse County, MN, Roberts County, SD

The radar

The Aberdeen radar (KABR), 161 km from the middle of the area, began a volume at 05:47 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 24, 12:50 AM CDT	TSTM WND DMG	3 W Wheaton, MN	TREE LIMBS UP TO 4 INCHES DIAMETER BROKEN. MORE MINOR DAMAGE LEADING INTO WHEATON. TIME ESTIMATED BASED ON RADAR.

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
Jul 23, 11:22 PM CDT	Severe Thunderstorm Watch	SPC	4 hr
Jul 23, 7:02 PM CDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Aberdeen, SD (KABR), launched 00:00Z, 5.7 hours before the alert went out and 185 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: 3002 J/kg
Mixed-layer CIN: -46 J/kg
Mixed-layer LCL: 1613 m above ground
0-6 km bulk shear: 37 kt
0-1 km storm-relative helicity: 53 m²/s²
0-3 km storm-relative helicity: 89 m²/s²
Significant tornado parameter: 0.4
Supercell composite: 6.9

Open this sounding in Storm Lab

The text

As transmitted.

932 
WUUS53 KABR 240543
SVRABR
MNC011-155-SDC109-240630-
/O.NEW.KABR.SV.W.0067.210724T0543Z-210724T0630Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Aberdeen SD
1243 AM CDT Sat Jul 24 2021

The National Weather Service in Aberdeen has issued a

* Severe Thunderstorm Warning for...
  Traverse County in west central Minnesota...
  Northern Big Stone County in west central Minnesota...
  Northeastern Roberts County in northeastern South Dakota...

* Until 130 AM CDT.

* At 1243 AM CDT, a severe thunderstorm was located over Rosholt, or
  9 miles west of Wheaton, moving east at 35 mph.

  HAZARD...60 mph wind gusts and penny size hail.

  SOURCE...Radar indicated.

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

* This severe thunderstorm will be near...
  Silver Bridge around 1250 AM CDT.
  Mud Lake Landing around 1255 AM CDT.
  Wheaton around 100 AM CDT.

Other locations in the path of this severe thunderstorm include
Immanuel Church.

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 Aberdeen.

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 4594 9627 4593 9625 4559 9625 4558 9624
      4544 9624 4545 9675 4594 9678 4594 9656
      4602 9657 4602 9627
TIME...MOT...LOC 0543Z 271DEG 30KT 4584 9669 

HAIL...0.75IN
WIND...60MPH
 
$$

Parkin

1 follow-up statement

621 
WWUS53 KABR 240627
SVSABR

Severe Weather Statement
National Weather Service Aberdeen SD
127 AM CDT Sat Jul 24 2021

MNC011-155-SDC109-240636-
/O.EXP.KABR.SV.W.0067.000000T0000Z-210724T0630Z/
Traverse MN-Big Stone MN-Roberts SD-
127 AM CDT Sat Jul 24 2021

...THE SEVERE THUNDERSTORM WARNING FOR TRAVERSE...NORTHERN BIG STONE
AND NORTHEASTERN ROBERTS COUNTIES WILL EXPIRE AT 130 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 200 AM CDT for
northeastern South Dakota. A Severe Thunderstorm Watch also remains
in effect until 500 AM CDT for west central Minnesota.

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

LAT...LON 4594 9627 4593 9625 4559 9625 4558 9624
      4544 9624 4545 9675 4594 9678 4594 9656
      4602 9657 4602 9627
TIME...MOT...LOC 0626Z 271DEG 30KT 4583 9620 

$$

Parkin

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 23, 11:13 PM CDT	Severe Thunderstorm Warning	ABR	Big Stone, Traverse	35 min
Jul 23, 11:55 PM CDT	Special Weather Statement	ABR	Big Stone	20 min
Jul 24, 12:29 AM CDT	Special Weather Statement	ABR	Traverse	46 min
Jul 23, 8:14 PM CDT	Severe Thunderstorm Warning	ABR	Corson	46 min
Jul 23, 8:42 PM CDT	Special Weather Statement	ABR	Corson	33 min
Jul 23, 9:27 PM CDT	Special Weather Statement	ABR	Marshall	33 min
Jul 23, 9:47 PM CDT	Severe Thunderstorm Warning	ABR	Campbell, Edmunds, McPherson	43 min
Jul 23, 10:06 PM CDT	Special Weather Statement	ABR	Walworth	24 min
Jul 23, 10:29 PM CDT	Severe Thunderstorm Warning	ABR	Brown, Edmunds, McPherson	46 min
Jul 23, 10:31 PM CDT	Severe Thunderstorm Warning	ABR	Brown, McPherson	44 min
Jul 23, 10:40 PM CDT	Special Weather Statement	ABR	Potter, Walworth	50 min
Jul 23, 10:42 PM CDT	Severe Thunderstorm Warning	ABR	Day, Marshall, Roberts	33 min
Jul 23, 10:54 PM CDT	Severe Thunderstorm Warning	ABR	Edmunds, Faulk, Potter, Sully, Walworth	51 min
Jul 23, 11:17 PM CDT	Severe Thunderstorm Warning	ABR	Brown, Marshall	30 min
Jul 23, 11:54 PM CDT	Special Weather Statement	ABR	Marshall	36 min

Nearby

Severe Thunderstorm Warnings in Minnesota, 2021 Severe Thunderstorm Warnings in South Dakota, 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.