Alert archive / South Dakota / Tornado Warnings in 2017

Tornado Warning 8, NWS Sioux Falls, SD

May 17, 2017Lincoln County, South Dakota

NWS Sioux Falls, SD issued this tornado warning at May 17, 2017, 2:14 PM CDT for Lincoln County, South Dakota. It was in force for 16 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: May 17, 2017, 2:14 PM CDT (19:14 UTC)
Expired: May 17, 2017, 2:30 PM CDT
In force: 16 min
Issued by: NWS Sioux Falls, SD
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 0.75 in

County Lincoln County, SD

The radar

The Sioux Falls radar (KFSD), 33 km from the middle of the area, began a volume at 19:16 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 nearest sounding before it

Omaha, NE (KOAX), launched 12:00Z, 7.2 hours before the alert went out and 221 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: 121 J/kg
Mixed-layer CIN: -156 J/kg
Mixed-layer LCL: 1106 m above ground
0-6 km bulk shear: 41 kt
0-1 km storm-relative helicity: 119 m²/s²
0-3 km storm-relative helicity: 132 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

395 
WFUS53 KFSD 171914
TORFSD
SDC083-171930-
/O.NEW.KFSD.TO.W.0008.170517T1914Z-170517T1930Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Sioux Falls SD
214 PM CDT WED MAY 17 2017

The National Weather Service in Sioux Falls has issued a

* Tornado Warning for...
  Central Lincoln County in southeastern South Dakota...

* Until 230 PM CDT
    
* At 213 PM CDT, a severe thunderstorm capable of producing a tornado
  was located near Canton, moving north at 35 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...
  Worthing around 220 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 4322 9663 4322 9671 4339 9681 4340 9663
TIME...MOT...LOC 1913Z 178DEG 30KT 4327 9668 

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

$$

Ferguson

1 follow-up statement

599 
WWUS53 KFSD 171923
SVSFSD

Severe Weather Statement
National Weather Service Sioux Falls SD
223 PM CDT WED MAY 17 2017

SDC083-171933-
/O.EXP.KFSD.TO.W.0008.000000T0000Z-170517T1930Z/
Lincoln SD-
223 PM CDT WED MAY 17 2017

...THE TORNADO WARNING FOR CENTRAL LINCOLN COUNTY WILL EXPIRE AT 230
PM CDT...
                
The storm which prompted the warning has weakened below severe
limits, and no longer appears capable of producing a tornado.
Therefore the warning will be allowed to expire.  However heavy rain
is still possible with this thunderstorm.

LAT...LON 4322 9663 4322 9671 4339 9681 4340 9663
TIME...MOT...LOC 1923Z 178DEG 30KT 4334 9668 

$$

Ferguson

The office that day

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

Issued	Product	Office	Counties	Lasted
May 17, 11:16 AM CDT	River Flood Warning	FSD	Union	5 days
May 17, 11:16 AM CDT	River Flood Warning	FSD	Union	6 days
May 17, 2:34 PM CDT	Severe Thunderstorm Warning	FSD	Lincoln, Minnehaha	26 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.