Alert archive / South Dakota / Tornado Warnings in 2020

Tornado Warning 14, NWS Sioux Falls, SD

August 28, 2020Kingsbury County, South Dakota

NWS Sioux Falls, SD issued this tornado warning at Aug 28, 2020, 1:22 AM CDT for Kingsbury County, South Dakota. It was in force for 38 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, 2020, 1:22 AM CDT (06:22 UTC)
Expired: Aug 28, 2020, 2:00 AM CDT
In force: 38 min
Issued by: NWS Sioux Falls, SD
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 0.75 in

County Kingsbury County, SD

The radar

The Sioux Falls radar (KFSD), 118 km from the middle of the area, began a volume at 06:27 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, 1:32 AM CDT	TSTM WND DMG	4 N De Smet, SD	TIPPED OVER TRAILER. SIDING RIPPED OFF TIN SHED. SOME TREE DAMAGE.
Aug 28, 1:52 AM CDT	TSTM WND DMG	Badger, SD	2-6 INCH BRANCHES DOWN.

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 27, 10:20 PM CDT	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

Aberdeen, SD (KABR), launched 00:00Z, 6.4 hours before the alert went out and 83 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: 451 J/kg
Mixed-layer CIN: -200 J/kg
Mixed-layer LCL: 1389 m above ground
0-6 km bulk shear: 52 kt
0-1 km storm-relative helicity: 140 m²/s²
0-3 km storm-relative helicity: 218 m²/s²
Significant tornado parameter: -0.0
Supercell composite: -0.1

Open this sounding in Storm Lab

The text

As transmitted.

040 
WFUS53 KFSD 280622
TORFSD
SDC077-280700-
/O.NEW.KFSD.TO.W.0014.200828T0622Z-200828T0700Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Sioux Falls SD
122 AM CDT Fri Aug 28 2020

The National Weather Service in Sioux Falls has issued a

* Tornado Warning for...
  Northern Kingsbury County in east central South Dakota...

* Until 200 AM CDT.
    
* At 122 AM CDT, a severe thunderstorm capable of producing a tornado
  was located 7 miles northeast of Iroquois, or 15 miles northwest of
  Lake Thompson State Recreation Area, moving east at 60 mph.

  HAZARD...Tornado.

  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...
  De Smet around 130 AM CDT.
  Badger around 150 AM CDT.

Other locations impacted by this tornadic thunderstorm include
Bancroft and Erwin.

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 4455 9742 4454 9717 4446 9715 4434 9784
      4440 9786 4454 9785
TIME...MOT...LOC 0622Z 258DEG 51KT 4443 9773 

TORNADO...RADAR INDICATED
HAIL...<.75IN

$$

SG

2 follow-up statements

516 
WWUS53 KFSD 280633
SVSFSD

Severe Weather Statement
National Weather Service Sioux Falls SD
133 AM CDT Fri Aug 28 2020

SDC077-280700-
/O.CON.KFSD.TO.W.0014.000000T0000Z-200828T0700Z/
Kingsbury SD-
133 AM CDT Fri Aug 28 2020

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 200 AM CDT FOR NORTHERN
KINGSBURY COUNTY...

At 133 AM CDT, a severe squall line capable of producing both
tornadoes and extensive straight line wind damage was located near De
Smet, or 10 miles northwest of Lake Thompson State Recreation Area,
moving east at 50 mph.

HAZARD...Tornado.

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.

These dangerous storms will be near...
  Badger around 155 AM CDT.

Other locations impacted by this tornadic thunderstorm include
Bancroft and Erwin.

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.

Tornadoes are extremely difficult to see and confirm at night. Do not
wait to see or hear the tornado. TAKE COVER NOW!

&&

LAT...LON 4455 9742 4454 9717 4446 9715 4434 9784
      4440 9786 4454 9785
TIME...MOT...LOC 0633Z 251DEG 43KT 4445 9754 

TORNADO...RADAR INDICATED
HAIL...<.75IN

$$

SG

085 
WWUS53 KFSD 280646
SVSFSD

Severe Weather Statement
National Weather Service Sioux Falls SD
146 AM CDT Fri Aug 28 2020

SDC077-280700-
/O.CON.KFSD.TO.W.0014.000000T0000Z-200828T0700Z/
Kingsbury SD-
146 AM CDT Fri Aug 28 2020

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 200 AM CDT FOR
NORTHEASTERN KINGSBURY COUNTY...

At 146 AM CDT, a severe squall line capable of producing both
tornadoes and extensive straight line wind damage was located near
Badger, or 13 miles northeast of Lake Thompson State Recreation Area,
moving east at 60 mph.

HAZARD...Tornado.

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.

These dangerous storms will be near...
  Badger around 150 AM CDT.

Other locations impacted by this tornadic thunderstorm include Erwin.

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.

Tornadoes are extremely difficult to see and confirm at night. Do not
wait to see or hear the tornado. TAKE COVER NOW!

&&

LAT...LON 4454 9717 4446 9715 4441 9746 4454 9749
TIME...MOT...LOC 0646Z 259DEG 51KT 4447 9728 

TORNADO...RADAR INDICATED
HAIL...<.75IN

$$

SG

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 28, 12:27 AM CDT	Severe Thunderstorm Warning	FSD	Beadle, Jerauld, Sanborn	63 min
Aug 28, 1:02 AM CDT	Severe Thunderstorm Warning	FSD	Beadle, Sanborn	28 min
Aug 28, 1:05 AM CDT	Severe Thunderstorm Warning	FSD	Aurora, Brule, Davison, Sanborn	25 min
Aug 28, 1:09 AM CDT	Severe Thunderstorm Warning	FSD	Brookings, Kingsbury, Lake, Miner	66 min
Aug 28, 1:19 AM CDT	Tornado Warning	FSD	Kingsbury	26 min
Aug 28, 1:28 AM CDT	Severe Thunderstorm Warning	FSD	Hanson, McCook	62 min
Aug 28, 1:50 AM CDT	Tornado Warning	FSD	Brookings, Kingsbury	25 min
Aug 28, 2:01 AM CDT	Severe Thunderstorm Warning	FSD	Brookings, Lake, Moody	59 min
Aug 28, 2:15 AM CDT	Tornado Warning	FSD	Brookings	30 min

Nearby

Tornado Warnings in South Dakota, 2020 Every tornado warning in 2020 Tornadoes 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.