Alert archive / South Dakota / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 252, NWS Sioux Falls, SD

September 19, 20175 counties in South Dakota

NWS Sioux Falls, SD issued this severe thunderstorm warning at Sep 19, 2017, 10:00 PM CDT for 5 counties in South Dakota. It was in force for 45 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: Sep 19, 2017, 10:00 PM CDT (03:00 UTC)
Expired: Sep 19, 2017, 10:45 PM CDT
In force: 45 min
Issued by: NWS Sioux Falls, SD
Area: Storm-based polygon
Hail: 1.0 in
Wind: 70.0 mph

Counties Aurora County, SD, Davison County, SD, Douglas County, SD, Hanson County, SD, Hutchinson County, SD

The radar

The Sioux Falls radar (KFSD), 121 km from the middle of the area, began a volume at 03:03 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
Sep 19, 10:02 PM CDT	TSTM WND GST 58	2 N Mitchell, SD

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
Sep 19, 3:37 PM CDT	Tornado Watch	SPC	8 hr

The nearest sounding before it

Aberdeen, SD (KABR), launched 00:00Z, 3.0 hours before the alert went out and 150 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.

136 
WUUS53 KFSD 200300
SVRFSD
SDC003-035-043-061-067-200345-
/O.NEW.KFSD.SV.W.0252.170920T0300Z-170920T0345Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Sioux Falls SD
1000 PM CDT TUE SEP 19 2017

The National Weather Service in Sioux Falls has issued a

* Severe Thunderstorm Warning for...
  Davison County in southeastern South Dakota...
  Southeastern Aurora County in south central South Dakota...
  Northeastern Douglas County in south central South Dakota...
  Southwestern Hanson County in southeastern South Dakota...
  Northwestern Hutchinson County in southeastern South Dakota...

* Until 1045 PM CDT

* At 959 PM CDT, a severe thunderstorm was located over Harrison, or
  17 miles south of Plankinton, moving northeast at 45 mph.

  HAZARD...70 mph wind gusts and quarter size hail. 

  SOURCE...Radar indicated. 

  IMPACT...Hail damage to vehicles is expected. Expect considerable 
           tree damage. Wind damage is also likely to mobile homes, 
           roofs, and outbuildings. 

* This severe thunderstorm will be near, 
  Corsica around 1005 PM CDT. 
  Stickney around 1015 PM CDT. 
  Mount Vernon around 1030 PM CDT. 
  Mitchell around 1045 PM CDT. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

A tornado watch remains in effect until midnight CDT for south
central and southeastern South Dakota.

LAT...LON 4384 9805 4349 9774 4330 9843 4330 9846
      4356 9867
TIME...MOT...LOC 0259Z 238DEG 38KT 4346 9854 

HAIL...1.00IN
WIND...70MPH
 
$$

Hanko

3 follow-up statements

643 
WWUS53 KFSD 200310
SVSFSD

Severe Weather Statement
National Weather Service Sioux Falls SD
1010 PM CDT TUE SEP 19 2017

SDC003-035-043-061-067-200345-
/O.CON.KFSD.SV.W.0252.000000T0000Z-170920T0345Z/
Davison SD-Aurora SD-Douglas SD-Hanson SD-Hutchinson SD-
1010 PM CDT TUE SEP 19 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1045 PM CDT
FOR DAVISON...SOUTHEASTERN AURORA...NORTHEASTERN DOUGLAS...
SOUTHWESTERN HANSON AND NORTHWESTERN HUTCHINSON COUNTIES...

At 1009 PM CDT, a severe thunderstorm was located near Stickney, or
14 miles south of Plankinton, moving northeast at 45 mph.

This is a very dangerous storm.

HAZARD...80 mph wind gusts and quarter size hail. 

SOURCE...Radar indicated. At 1002 PM CDT 60 mph wind gusts were 
         reported at Mitchell Airport. 

IMPACT...Flying debris will be dangerous to those caught without 
         shelter. Mobile homes will be heavily damaged. Expect 
         considerable damage to roofs, windows, and vehicles. 
         Extensive tree damage and power outages are likely. 

This severe storm will be near...
  Mount Vernon around 1030 PM CDT. 
  Mitchell around 1045 PM CDT. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

A tornado watch remains in effect until midnight CDT for south
central and southeastern South Dakota.

LAT...LON 4384 9805 4349 9774 4335 9834 4333 9844
      4358 9860
TIME...MOT...LOC 0309Z 238DEG 38KT 4352 9841 

TORNADO...POSSIBLE
HAIL...1.00IN
WIND...80MPH
 
$$

Hanko

067 
WWUS53 KFSD 200329
SVSFSD

Severe Weather Statement
National Weather Service Sioux Falls SD
1029 PM CDT TUE SEP 19 2017

SDC003-200339-
/O.CAN.KFSD.SV.W.0252.000000T0000Z-170920T0345Z/
Aurora SD-
1029 PM CDT TUE SEP 19 2017

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN AURORA COUNTY IS
CANCELLED...
    
The severe 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 midnight CDT for south
central and southeastern South Dakota.

LAT...LON 4384 9805 4349 9774 4341 9809 4372 9830
TIME...MOT...LOC 0329Z 238DEG 38KT 4363 9816 

$$

SDC035-043-061-067-200345-
/O.CON.KFSD.SV.W.0252.000000T0000Z-170920T0345Z/
Davison SD-Douglas SD-Hanson SD-Hutchinson SD-
1029 PM CDT TUE SEP 19 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1045 PM CDT
FOR DAVISON...NORTHEASTERN DOUGLAS...SOUTHWESTERN HANSON AND
NORTHWESTERN HUTCHINSON COUNTIES...

At 1029 PM CDT, a severe thunderstorm was located 7 miles southeast
of Mount Vernon, or 9 miles southwest of Mitchell, moving northeast
at 45 mph.

This is a very dangerous storm.

HAZARD...80 mph wind gusts and quarter size hail. 

SOURCE...Radar indicated. 

IMPACT...Flying debris will be dangerous to those caught without 
         shelter. Mobile homes will be heavily damaged. Expect 
         considerable damage to roofs, windows, and vehicles. 
         Extensive tree damage and power outages are likely. 

This severe storm will be near...
  Mitchell around 1045 PM CDT. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

A tornado watch remains in effect until midnight CDT for south
central and southeastern South Dakota.

LAT...LON 4384 9805 4349 9774 4341 9809 4372 9830
TIME...MOT...LOC 0329Z 238DEG 38KT 4363 9816 

TORNADO...POSSIBLE
HAIL...1.00IN
WIND...80MPH
 
$$

Hanko

370 
WWUS53 KFSD 200340
SVSFSD

Severe Weather Statement
National Weather Service Sioux Falls SD
1040 PM CDT TUE SEP 19 2017

SDC035-043-061-067-200350-
/O.EXP.KFSD.SV.W.0252.000000T0000Z-170920T0345Z/
Davison SD-Douglas SD-Hanson SD-Hutchinson SD-
1040 PM CDT TUE SEP 19 2017

...THE SEVERE THUNDERSTORM WARNING FOR DAVISON...NORTHEASTERN
DOUGLAS...SOUTHWESTERN HANSON AND NORTHWESTERN HUTCHINSON COUNTIES
WILL EXPIRE AT 1045 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 southeastern
South Dakota.

LAT...LON 4384 9805 4349 9774 4341 9809 4372 9830
TIME...MOT...LOC 0340Z 238DEG 38KT 4369 9803 

$$

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, 8:08 PM CDT	Tornado Warning	FSD	Beadle	22 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, 10:15 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

Severe Thunderstorm Warnings in South Dakota, 2017 Every severe thunderstorm warning 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.