Alert archive / South Dakota / Tornado Warnings in 2021
Tornado Warning 6, NWS Sioux Falls, SD
NWS Sioux Falls, SD issued this tornado warning at Aug 22, 2021, 6:47 PM CDT for Aurora County, Davison County, Sanborn County, South Dakota. It was in force for 32 min. No storm report in the archive falls inside the area while it was in force.
The area
The outline as issued.
The facts
- Issued
- Aug 22, 2021, 6:47 PM CDT (23:47 UTC)
- Expired
- Aug 22, 2021, 7:19 PM CDT
- In force
- 32 min
- Issued by
- NWS Sioux Falls, SD
- Area
- Storm-based polygon
- Tornado
- Radar indicated
- Hail
- 2.5 in
Counties Aurora County, SD, Davison County, SD, Sanborn County, SD
The radar
The Sioux Falls radar (KFSD), 116 km from the middle of the area, began a volume at 23:49 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.
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 22, 3:36 PM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Aug 22, 6:31 PM CDT | Tornado Watch | SPC | 3 hr |
The nearest sounding before it
Aberdeen, SD (KABR), launched 12:00Z, 11.8 hours before the alert went out and 119 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.
- Mixed-layer CAPE
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1388 m above ground
- 0-6 km bulk shear
- 33 kt
- 0-1 km storm-relative helicity
- 135 m²/s²
- 0-3 km storm-relative helicity
- 261 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
962
WFUS53 KFSD 222347
TORFSD
SDC003-035-111-230030-
/O.NEW.KFSD.TO.W.0006.210822T2347Z-210823T0030Z/
BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Sioux Falls SD
647 PM CDT Sun Aug 22 2021
The National Weather Service in Sioux Falls has issued a
* Tornado Warning for...
Northern Davison County in southeastern South Dakota...
Southwestern Sanborn County in east central South Dakota...
Northeastern Aurora County in south central South Dakota...
* Until 730 PM CDT.
* At 647 PM CDT, a severe thunderstorm capable of producing a tornado
was located near Storla, or 11 miles north of Plankinton, moving
east at 30 mph.
HAZARD...Tornado and tennis ball size hail.
SOURCE...Radar indicated rotation.
IMPACT...Flying debris will be dangerous to those caught without
shelter. Mobile homes will be damaged or destroyed.
Damage to roofs, windows, and vehicles will occur. Tree
damage is likely.
* This dangerous storm will be near...
Storla around 655 PM CDT.
Letcher around 710 PM CDT.
Loomis around 715 PM CDT.
Mitchell around 725 PM CDT.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.
&&
LAT...LON 4389 9795 4385 9796 4385 9797 4381 9796
4367 9799 4383 9849 4394 9848 4394 9839
TIME...MOT...LOC 2347Z 279DEG 28KT 4387 9841
TORNADO...RADAR INDICATED
MAX HAIL SIZE...2.50 IN
$$
Schumacher3 follow-up statements
858
WWUS53 KFSD 230002
SVSFSD
Severe Weather Statement
National Weather Service Sioux Falls SD
702 PM CDT Sun Aug 22 2021
SDC003-230011-
/O.CAN.KFSD.TO.W.0006.000000T0000Z-210823T0030Z/
Aurora SD-
702 PM CDT Sun Aug 22 2021
...THE TORNADO WARNING FOR NORTHEASTERN AURORA COUNTY IS CANCELLED...
The tornadic thunderstorm which prompted the warning has moved out
of the warned area. Therefore, the warning has been cancelled.
A Tornado Watch remains in effect until 1000 PM CDT for south
central, southeastern and east central South Dakota.
LAT...LON 4388 9795 4385 9796 4385 9797 4377 9797
4367 9799 4377 9832 4378 9832 4391 9833
TIME...MOT...LOC 0001Z 286DEG 28KT 4387 9827
$$
SDC035-111-230030-
/O.CON.KFSD.TO.W.0006.000000T0000Z-210823T0030Z/
Davison SD-Sanborn SD-
702 PM CDT Sun Aug 22 2021
...A TORNADO WARNING REMAINS IN EFFECT UNTIL 730 PM CDT FOR NORTHERN
DAVISON AND SOUTHWESTERN SANBORN COUNTIES...
At 701 PM CDT, a severe thunderstorm capable of producing a tornado
was located near Storla, or 15 miles northwest of Mitchell, moving
east at 30 mph.
HAZARD...Tornado and two inch hail.
SOURCE...Radar indicated rotation.
IMPACT...Flying debris will be dangerous to those caught without
shelter. Mobile homes will be damaged or destroyed. Damage
to roofs, windows, and vehicles will occur. Tree damage is
likely.
Locations impacted include...
Letcher, Loomis and Mitchell.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.
&&
LAT...LON 4388 9795 4385 9796 4385 9797 4377 9797
4367 9799 4377 9832 4378 9832 4391 9833
TIME...MOT...LOC 0001Z 286DEG 28KT 4387 9827
TORNADO...RADAR INDICATED
MAX HAIL SIZE...2.00 IN
$$
Schumacher848
WWUS53 KFSD 230012
SVSFSD
Severe Weather Statement
National Weather Service Sioux Falls SD
712 PM CDT Sun Aug 22 2021
SDC035-111-230030-
/O.CON.KFSD.TO.W.0006.000000T0000Z-210823T0030Z/
Davison SD-Sanborn SD-
712 PM CDT Sun Aug 22 2021
...A TORNADO WARNING REMAINS IN EFFECT UNTIL 730 PM CDT FOR
NORTHEASTERN DAVISON AND SOUTH CENTRAL SANBORN COUNTIES...
At 712 PM CDT, a severe thunderstorm capable of producing a tornado
was located near Loomis, or 8 miles northwest of Mitchell, moving
east at 30 mph.
HAZARD...Tornado and two inch hail.
SOURCE...Radar indicated rotation.
IMPACT...Flying debris will be dangerous to those caught without
shelter. Mobile homes will be damaged or destroyed. Damage
to roofs, windows, and vehicles will occur. Tree damage is
likely.
This dangerous storm will be near...
Loomis and Mitchell around 720 PM CDT.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.
&&
LAT...LON 4388 9795 4385 9796 4385 9797 4377 9797
4375 9798 4380 9826 4389 9825
TIME...MOT...LOC 0012Z 281DEG 28KT 4385 9811
TORNADO...RADAR INDICATED
MAX HAIL SIZE...2.00 IN
$$
Schumacher757
WWUS53 KFSD 230019
SVSFSD
Severe Weather Statement
National Weather Service Sioux Falls SD
719 PM CDT Sun Aug 22 2021
SDC035-111-230029-
/O.CAN.KFSD.TO.W.0006.000000T0000Z-210823T0030Z/
Davison SD-Sanborn SD-
719 PM CDT Sun Aug 22 2021
...THE TORNADO WARNING FOR NORTHEASTERN DAVISON AND SOUTH CENTRAL
SANBORN COUNTIES IS CANCELLED...
The tornado threat has diminished and the Tornado Warning has been
cancelled. However, large hail and damaging winds remain likely and a
Severe Thunderstorm Warning remains in effect for the area.
A Tornado Watch remains in effect until 1000 PM CDT for southeastern
and east central South Dakota.
LAT...LON 4388 9795 4385 9796 4385 9797 4377 9797
4375 9798 4380 9826 4389 9825
TIME...MOT...LOC 0017Z 279DEG 28KT 4384 9803
$$
SchumacherThe office that day
Everything else NWS Sioux Falls, SD issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 22, 5:15 PM CDT | Severe Thunderstorm Warning | FSD | Brule | 45 min |
| Aug 22, 5:48 PM CDT | Severe Thunderstorm Warning | FSD | Aurora, Brule, Jerauld | 42 min |
| Aug 22, 6:23 PM CDT | Severe Thunderstorm Warning | FSD | Aurora, Jerauld | 40 min |
Nearby
Tornado Warnings in South Dakota, 2021Every tornado warning in 2021Tornadoes 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.