Alert archive / South Dakota / Tornado Warnings in 2015

Tornado Warning 18, NWS Sioux Falls, SD

July 23, 2015Beadle County, Sanborn County, South Dakota

NWS Sioux Falls, SD issued this tornado warning at Jul 23, 2015, 8:39 PM CDT for Beadle County, Sanborn County, South Dakota. It was in force for 36 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: Jul 23, 2015, 8:39 PM CDT (01:39 UTC)
Expired: Jul 23, 2015, 9:15 PM CDT
In force: 36 min
Issued by: NWS Sioux Falls, SD
Area: Storm-based polygon
Tornado: Observed
Hail: 1.5 in

Counties Beadle County, SD, Sanborn County, SD

The radar

The Sioux Falls radar (KFSD), 133 km from the middle of the area, began a volume at 01:41 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
Jul 23, 8:44 PM CDT	TORNADO	10 S Huron, SD	BEANS SCOURED
Jul 23, 8:59 PM CDT	HAIL 1	6 Ne Woonsocket, SD

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Aberdeen, SD (KABR), launched 00:00Z, 1.7 hours before the alert went out and 81 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: 3528 J/kg
Mixed-layer CIN: -10 J/kg
Mixed-layer LCL: 1264 m above ground
0-6 km bulk shear: 25 kt
0-1 km storm-relative helicity: 129 m²/s²
0-3 km storm-relative helicity: 209 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 12.1

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

206 
WFUS53 KFSD 240139
TORFSD
SDC005-111-240215-
/O.NEW.KFSD.TO.W.0018.150724T0139Z-150724T0215Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE SIOUX FALLS SD
839 PM CDT THU JUL 23 2015

THE NATIONAL WEATHER SERVICE IN SIOUX FALLS HAS ISSUED A

* TORNADO WARNING FOR...
  SOUTHEASTERN BEADLE COUNTY IN EAST CENTRAL SOUTH DAKOTA...
  NORTHERN SANBORN COUNTY IN EAST CENTRAL SOUTH DAKOTA...

* UNTIL 915 PM CDT

* AT 838 PM CDT...A CONFIRMED TORNADO WAS LOCATED 8 MILES EAST OF
  ALPENA...OR 9 MILES SOUTH OF HURON...MOVING EAST AT 10 MPH.

  HAZARD...DAMAGING TORNADO AND PING PONG BALL SIZE HAIL. 

  SOURCE...LAW ENFORCEMENT CONFIRMED TORNADO. AT 836 PM CDT A 
TORNADO WAS REPORTED 9 MILES SOUTH OF HURON. 

  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
  SOUTHEASTERN BEADLE AND NORTHERN SANBORN COUNTIES.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TO REPEAT...A TORNADO IS ON THE GROUND. 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 4410 9827 4428 9830 4435 9800 4412 9796
TIME...MOT...LOC 0138Z 264DEG 6KT 4420 9820 

TORNADO...OBSERVED
HAIL...1.50IN

$$

HANKO

2 follow-up statements

783 
WWUS53 KFSD 240146
SVSFSD

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
846 PM CDT THU JUL 23 2015

SDC005-111-240215-
/O.CON.KFSD.TO.W.0018.000000T0000Z-150724T0215Z/
BEADLE SD-SANBORN SD-
846 PM CDT THU JUL 23 2015

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 915 PM CDT FOR
SOUTHEASTERN BEADLE AND NORTHWESTERN SANBORN COUNTIES...
    
AT 844 PM CDT...A CONFIRMED TORNADO WAS LOCATED 8 MILES EAST OF
ALPENA...OR 10 MILES SOUTH OF HURON...MOVING EAST AT 5 MPH.

HAZARD...DAMAGING TORNADO AND PING PONG BALL SIZE HAIL. 

SOURCE...LAW ENFORCEMENT CONFIRMED TORNADO. AT 842 PM CDT AT TORNADO 
WAS REPORTED 8 MILES EAST OF ALPENA.

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
SOUTHEASTERN BEADLE AND NORTHWESTERN SANBORN COUNTIES.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TO REPEAT...A TORNADO IS ON THE GROUND. 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 4412 9825 4428 9828 4435 9800 4414 9797
TIME...MOT...LOC 0144Z 254DEG 6KT 4421 9821 

TORNADO...OBSERVED
HAIL...1.50IN

$$

HANKO

911 
WWUS53 KFSD 240159
SVSFSD

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
859 PM CDT THU JUL 23 2015

SDC005-111-240215-
/O.CON.KFSD.TO.W.0018.000000T0000Z-150724T0215Z/
BEADLE SD-SANBORN SD-
859 PM CDT THU JUL 23 2015

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 915 PM CDT FOR
SOUTHEASTERN BEADLE AND NORTH CENTRAL SANBORN COUNTIES...
    
AT 858 PM CDT...A CONFIRMED TORNADO WAS LOCATED 10 MILES EAST OF
ALPENA...OR 11 MILES SOUTH OF HURON...MOVING EAST AT 5 MPH.

HAZARD...DAMAGING TORNADO AND QUARTER SIZE HAIL. 

SOURCE...LAW ENFORCEMENT CONFIRMED TORNADO. 

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
SOUTHEASTERN BEADLE AND NORTH CENTRAL SANBORN COUNTIES.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

HEAVY RAINFALL MAY HIDE THIS TORNADO. DO NOT WAIT TO SEE OR HEAR THE
TORNADO. TAKE COVER NOW.

&&

LAT...LON 4415 9815 4427 9819 4433 9800 4414 9797
TIME...MOT...LOC 0158Z 259DEG 5KT 4421 9815 

TORNADO...OBSERVED
HAIL...1.00IN

$$

HANKO

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 23, 7:24 PM CDT	Severe Thunderstorm Warning	FSD	Beadle, Jerauld, Sanborn	51 min
Jul 23, 7:55 PM CDT	Severe Thunderstorm Warning	FSD	Beadle, Kingsbury, Sanborn	33 min
Jul 23, 8:10 PM CDT	Severe Thunderstorm Warning	FSD	Beadle, Sanborn	50 min
Jul 23, 8:55 PM CDT	Severe Thunderstorm Warning	FSD	Beadle, Kingsbury, Miner, Sanborn	50 min
Jul 23, 9:13 PM CDT	Tornado Warning	FSD	Beadle, Sanborn	32 min
Jul 23, 9:45 PM CDT	Tornado Warning	FSD	Kingsbury, Miner, Sanborn	45 min
Jul 23, 10:24 PM CDT	Tornado Warning	FSD	Miner	51 min
Jul 23, 11:15 PM CDT	Tornado Warning	FSD	Lake, Miner	25 min
Jul 23, 11:38 PM CDT	Severe Thunderstorm Warning	FSD	Lake	14 min

Nearby

Tornado Warnings in South Dakota, 2015 Every tornado warning in 2015 Tornadoes in 2015

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.