Alert archive / South Dakota / Tornado Warnings in 2017

Tornado Warning 38, NWS Sioux Falls, SD

September 19, 2017Beadle County, South Dakota

NWS Sioux Falls, SD issued this tornado warning at Sep 19, 2017, 8:08 PM CDT for Beadle County, South Dakota. It was in force for 22 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: Sep 19, 2017, 8:08 PM CDT (01:08 UTC)
Expired: Sep 19, 2017, 8:30 PM CDT
In force: 22 min
Issued by: NWS Sioux Falls, SD
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 1.25 in

County Beadle County, SD

The radar

The Aberdeen radar (KABR), 97 km from the middle of the area, began a volume at 01:10 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
Sep 19, 3:37 PM CDT	Tornado Watch	SPC	8 hr

The nearest sounding before it

Aberdeen, SD (KABR), launched 00:00Z, 1.1 hours before the alert went out and 36 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: 2563 J/kg
Mixed-layer CIN: -16 J/kg
Mixed-layer LCL: 1127 m above ground
0-6 km bulk shear: 40 kt
0-1 km storm-relative helicity: 229 m²/s²
0-3 km storm-relative helicity: 239 m²/s²
Significant tornado parameter: 2.6
Supercell composite: 16.8

Open this sounding in Storm Lab

The text

As transmitted.

662 
WFUS53 KFSD 200108
TORFSD
SDC005-200130-
/O.NEW.KFSD.TO.W.0038.170920T0108Z-170920T0130Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Sioux Falls SD
808 PM CDT TUE SEP 19 2017

The National Weather Service in Sioux Falls has issued a

* Tornado Warning for...
  North central Beadle County in east central South Dakota...

* Until 830 PM CDT
    
* At 807 PM CDT, a severe thunderstorm capable of producing a tornado
  was located 8 miles southeast of Hitchcock, or 14 miles north of
  Huron, moving northeast at 30 mph.

  HAZARD...Tornado and half dollar 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 tornadic thunderstorm will remain over mainly rural areas of
  north central Beadle County, including the following locations:
  Broadland.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4463 9807 4449 9832 4456 9846 4463 9840
TIME...MOT...LOC 0107Z 224DEG 27KT 4457 9826 

TORNADO...RADAR INDICATED
HAIL...1.25IN

$$

Hanko

1 follow-up statement

633 
WWUS53 KFSD 200126
SVSFSD

Severe Weather Statement
National Weather Service Sioux Falls SD
826 PM CDT TUE SEP 19 2017

SDC005-200136-
/O.EXP.KFSD.TO.W.0038.000000T0000Z-170920T0130Z/
Beadle SD-
826 PM CDT TUE SEP 19 2017

...THE TORNADO WARNING FOR NORTH CENTRAL BEADLE COUNTY WILL EXPIRE AT
830 PM CDT...
        
The storm which prompted the warning has moved out of the area.
Therefore the warning will be allowed to expire.

A tornado watch remains in effect until midnight CDT for east central
South Dakota.

LAT...LON 4463 9807 4449 9832 4456 9846 4463 9840
TIME...MOT...LOC 0126Z 224DEG 27KT 4467 9813 

$$

Hanko

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 19, 7:59 PM CDT	Severe Thunderstorm Warning	FSD	Beadle	31 min
Sep 19, 8:38 PM CDT	Severe Thunderstorm Warning	FSD	Aurora, Beadle, Jerauld, Sanborn	52 min
Sep 19, 8:53 PM CDT	Severe Thunderstorm Warning	FSD	Aurora, Brule	52 min
Sep 19, 8:57 PM CDT	Severe Thunderstorm Warning	FSD	Gregory	48 min
Sep 19, 9:17 PM CDT	Tornado Warning	FSD	Aurora, Brule	28 min
Sep 19, 9:21 PM CDT	Severe Thunderstorm Warning	FSD	Beadle, Jerauld, Kingsbury, Miner, Sanborn	39 min
Sep 19, 9:41 PM CDT	Severe Thunderstorm Warning	FSD	Aurora, Davison, Hanson, Sanborn	49 min
Sep 19, 9:55 PM CDT	Severe Thunderstorm Warning	FSD	Beadle, Kingsbury, Miner, Sanborn	46 min
Sep 19, 10:00 PM CDT	Severe Thunderstorm Warning	FSD	Aurora, Davison, Douglas, Hanson, Hutchinson	45 min
Sep 19, 10:15 PM CDT	Severe Thunderstorm Warning	FSD	Kingsbury, Lake, Miner, Sanborn	45 min
Sep 19, 10:39 PM CDT	Severe Thunderstorm Warning	FSD	Hanson, Kingsbury, Lake, McCook, Miner, Minnehaha and 1 more	36 min
Sep 19, 11:04 PM CDT	Tornado Warning	FSD	Lake, McCook, Minnehaha, Moody	26 min
Sep 19, 11:08 PM CDT	Severe Thunderstorm Warning	FSD	Brookings, Lake, McCook, Minnehaha, Moody	52 min
Sep 19, 11:29 PM CDT	Severe Thunderstorm Warning	FSD	Lincoln, Minnehaha	46 min
Sep 19, 11:47 PM CDT	Severe Thunderstorm Warning	FSD	Brookings	43 min

Nearby

Tornado Warnings in South Dakota, 2017 Every tornado warning in 2017 Tornadoes in 2017

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.