Alert archive / South Dakota / Tornado Warnings in 2009

Tornado Warning 21, NWS Sioux Falls, SD

June 16, 20094 counties in South Dakota

NWS Sioux Falls, SD issued this tornado warning at Jun 16, 2009, 8:36 PM CDT for 4 counties in South Dakota. It was in force for 24 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: Jun 16, 2009, 8:36 PM CDT (01:36 UTC)
Expired: Jun 16, 2009, 9:00 PM CDT
In force: 24 min
Issued by: NWS Sioux Falls, SD
Area: Storm-based polygon

Counties Bon Homme County, SD, Clay County, SD, Turner County, SD, Yankton County, SD

The radar

The Sioux Falls radar (KFSD), 86 km from the middle of the area, began a volume at 01:36 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
Jun 16, 8:55 PM CDT	HAIL 0.88	Utica, SD
Jun 16, 9:02 PM CDT	HAIL 1	2 N Utica, SD	IN ADDITION TO QUARTER SIZE HAIL, WINDS WERE GUSTING TO 40-60 MPH.

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
Jun 16, 4:16 PM CDT	Tornado Watch	SPC	7 hr

The nearest sounding before it

Omaha, NE (KOAX), launched 00:00Z, 1.6 hours before the alert went out and 191 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: 264 J/kg
Mixed-layer CIN: -115 J/kg
Mixed-layer LCL: 1545 m above ground
0-6 km bulk shear: 34 kt
0-1 km storm-relative helicity: 28 m²/s²
0-3 km storm-relative helicity: 108 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

Open this sounding in Storm Lab

The text

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

000 
WFUS53 KFSD 170136
TORFSD
SDC009-027-125-135-170200-
/O.NEW.KFSD.TO.W.0021.090617T0136Z-090617T0200Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE SIOUX FALLS SD
836 PM CDT TUE JUN 16 2009

THE NATIONAL WEATHER SERVICE IN SIOUX FALLS HAS ISSUED A

* TORNADO WARNING FOR...
  EASTERN BON HOMME COUNTY IN SOUTHEAST SOUTH DAKOTA
  CLAY COUNTY IN SOUTHEAST SOUTH DAKOTA
  SOUTHERN TURNER COUNTY IN SOUTHEAST SOUTH DAKOTA
  SOUTHERN YANKTON COUNTY IN SOUTHEAST SOUTH DAKOTA

* UNTIL 900 PM CDT

* AT 832 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING A TORNADO. THESE
  DANGEROUS STORMS WERE LOCATED ALONG A LINE EXTENDING FROM WAKONDA
  TO VOLIN TO 7 MILES NORTHWEST OF UTICA...AND MOVING SOUTHEAST AT 20
  MPH.

* THESE TORNADIC STORMS WILL BE NEAR...
   UTICA AROUND 840 PM CDT...
   MISSION HILL...GAYVILLE AROUND 845 PM CDT...
   MECKLING AROUND 855 PM CDT...
   YANKTON...LEWIS AND CLARK STATE PARK AROUND 900 PM CDT...

NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUES TO INDICATE 
MULTIPLE AREAS OF ROTATION ALONG THE LEADING EDGE OF THIS STORM.  IF 
YOU ARE IN THE PATH OF THIS LIFE THREATING STORM...TAKE SHELTER 
NOW.  IN ADDITION TO THE POSSIBLITY OF TORNADOES..THIS STORM CAN 
PRODUCE WINDS IN EXCESS OF 70 MPH AND HAIL TO THE SIZE OF GOLFBALLS.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TORNADOES ARE DIFFICULT TO SEE AT NIGHT...SO DO NOT WAIT. TAKE COVER
NOW

IN ADDITION TO THE TORNADO...THIS STORM IS CAPABLE OF PRODUCING 
GOLFBALL SIZE HAIL AND DESTRUCTIVE STRAIGHT LINE WINDS.

&&

LAT...LON 4280 9719 4285 9724 4286 9741 4284 9747
      4314 9779 4300 9725 4317 9715 4288 9684
      4276 9698
TIME...MOT...LOC 0134Z 323DEG 19KT 4301 9711 4293 9717
          4303 9759

$$

BT

1 follow-up statement

000 
WWUS53 KFSD 170147
SVSFSD

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
847 PM CDT TUE JUN 16 2009

SDC009-027-125-135-170200-
/O.CON.KFSD.TO.W.0021.000000T0000Z-090617T0200Z/
TURNER SD-YANKTON SD-BON HOMME SD-CLAY SD-
847 PM CDT TUE JUN 16 2009

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 900 PM CDT FOR CLAY...
NORTHEASTERN BON HOMME...SOUTHERN YANKTON AND SOUTHERN TURNER
COUNTIES...

AT 842 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A LINE OF TORNADO PRODUCING STORMS. THESE TORNADO PRODUCING
STORMS WERE LOCATED ALONG A LINE EXTENDING FROM WAKONDA TO GAYVILLE
TO UTICA...MOVING SOUTHEAST AT 20 MPH.

TORNADO PRODUCING STORMS WILL BE NEAR...
MECKLING AROUND 855 PM CDT...
YANKTON AND LEWIS AND CLARK STATE PARK AROUND 900 PM CDT...

NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUES TO INDICATE 
MULTIPLE CIRCUTLATIONS ALONG THE LEADING EDGE OF THIS COMPLEX OF 
STORMS.  IF YOU ARE IN THE PATH OF THIS STORM...SEEK SHELTER 
IMMEDIATELY.  IT IS LIKELY ANY TORNADOES WOULD BE VERY DIFFICULT TO 
SEE...AND MAY BE SHIELDED IN RAIN

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IN ADDITION TO THE TORNADO...THIS STORM IS CAPABLE OF PRODUCING 
TENNISBALL
SIZE HAIL AND DESTRUCTIVE STRAIGHT LINE WINDS.

TORNADOES ARE DIFFICULT TO SEE AT NIGHT...SO DO NOT WAIT. TAKE COVER
NOW

A TORNADO WATCH REMAINS IN EFFECT UNTIL 900 PM CDT TUESDAY EVENING
FOR SOUTHEAST SOUTH DAKOTA.

&&

LAT...LON 4280 9719 4285 9724 4286 9741 4284 9747
      4314 9779 4300 9725 4317 9715 4288 9684
      4276 9698
TIME...MOT...LOC 0144Z 323DEG 19KT 4297 9707 4289 9713
          4299 9755

$$

BT

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 16, 7:12 PM CDT	Severe Thunderstorm Warning	FSD	Davison, Hanson, Hutchinson, McCook	48 min
Jun 16, 7:39 PM CDT	Tornado Warning	FSD	Hutchinson, Turner, Yankton	36 min
Jun 16, 8:10 PM CDT	Tornado Warning	FSD	Bon Homme, Clay, Hutchinson, Turner, Yankton	35 min
Jun 16, 8:58 PM CDT	Severe Thunderstorm Warning	FSD	Bon Homme, Clay, Yankton	32 min
Jun 16, 9:05 PM CDT	Tornado Warning	FSD	Bon Homme, Clay, Yankton	25 min
Jun 16, 9:27 PM CDT	Severe Thunderstorm Warning	FSD	Clay, Union, Yankton	48 min
Jun 16, 9:55 PM CDT	Severe Thunderstorm Warning	FSD	Clay, Union	50 min
Jun 16, 10:47 PM CDT	Severe Thunderstorm Warning	FSD	Union	43 min
Jun 17, 3:59 AM CDT	Dense Fog Advisory	FSD	Lake, Lincoln, Minnehaha, Moody	5 hr
Jun 17, 5:43 PM CDT	Severe Thunderstorm Warning	FSD	Gregory	47 min
Jun 17, 5:54 PM CDT	Tornado Warning	FSD	Gregory	36 min
Jun 17, 6:31 PM CDT	Severe Thunderstorm Warning	FSD	Gregory	44 min

Nearby

Tornado Warnings in South Dakota, 2009 Every tornado warning in 2009 Tornadoes in 2009

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.