Alert archive / South Dakota / Tornado Warnings in 2009

Tornado Warning 41, NWS Sioux Falls, SD

July 7, 2009Kingsbury County, Miner County, Sanborn County, South Dakota

NWS Sioux Falls, SD issued this tornado warning at Jul 7, 2009, 8:23 PM CDT for Kingsbury County, Miner County, Sanborn County, South Dakota. It was in force for 29 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: Jul 7, 2009, 8:23 PM CDT (01:23 UTC)
Expired: Jul 7, 2009, 8:52 PM CDT
In force: 29 min
Issued by: NWS Sioux Falls, SD
Area: Storm-based polygon

Counties Kingsbury County, SD, Miner County, SD, Sanborn County, SD

The radar

The Sioux Falls radar (KFSD), 98 km from the middle of the area, began a volume at 01:23 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
Jul 7, 2:13 PM CDT	Severe Thunderstorm Watch	SPC	8 hr

The nearest sounding before it

Aberdeen, SD (KABR), launched 00:00Z, 1.4 hours before the alert went out and 101 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1262 m above ground
0-6 km bulk shear: 36 kt
0-1 km storm-relative helicity: 23 m²/s²
0-3 km storm-relative helicity: 213 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

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

000 
WFUS53 KFSD 080123
TORFSD
SDC077-097-111-080215-
/O.NEW.KFSD.TO.W.0041.090708T0123Z-090708T0215Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE SIOUX FALLS SD
823 PM CDT TUE JUL 7 2009

THE NATIONAL WEATHER SERVICE IN SIOUX FALLS HAS ISSUED A

* TORNADO WARNING FOR...
  SOUTHWESTERN KINGSBURY COUNTY IN EAST CENTRAL SOUTH DAKOTA
  NORTHWESTERN MINER COUNTY IN EAST CENTRAL SOUTH DAKOTA
  EXTREME NORTHEASTERN SANBORN COUNTY IN EAST CENTRAL SOUTH DAKOTA

* UNTIL 915 PM CDT

* AT 820 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO. THIS DANGEROUS
  STORM WAS LOCATED 6 MILES NORTHWEST OF CARTHAGE...OR 23 MILES
  SOUTHEAST OF HURON...AND MOVING SOUTHEAST AT 15 MPH.

* THIS TORNADIC STORM WILL BE NEAR...
   CARTHAGE AROUND 840 PM CDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

WHEN A TORNADO WARNING IS ISSUED BASED ON DOPPLER RADAR...IT MEANS
THAT STRONG ROTATION HAS BEEN DETECTED IN THE STORM. A TORNADO MAY
ALREADY BE ON THE GROUND...OR IS EXPECTED TO DEVELOP SHORTLY. IF YOU
ARE IN THE PATH OF THIS DANGEROUS STORM...MOVE INDOORS AND TO THE
LOWEST LEVEL OF THE BUILDING. STAY AWAY FROM WINDOWS. IF DRIVING...DO
NOT SEEK SHELTER UNDER A HIGHWAY OVERPASS.

&&

LAT...LON 4416 9751 4399 9772 4419 9787 4425 9777
TIME...MOT...LOC 0123Z 310DEG 15KT 4419 9781

$$

1 follow-up statement

000 
WWUS53 KFSD 080152
SVSFSD

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
852 PM CDT TUE JUL 7 2009

SDC077-097-111-080202-
/O.CAN.KFSD.TO.W.0041.000000T0000Z-090708T0215Z/
SANBORN SD-MINER SD-KINGSBURY SD-
852 PM CDT TUE JUL 7 2009

...THE TORNADO WARNING FOR SOUTHWESTERN KINGSBURY...NORTHWESTERN
MINER AND EXTREME NORTHEASTERN SANBORN COUNTIES IS CANCELLED...

THE STORM WHICH PROMPTED THE WARNING HAS MOVED OUT OF THE WARNED
AREA.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 1000 PM CDT
TUESDAY EVENING FOR NORTHWEST IOWA AND SOUTHWEST MINNESOTA AND
NORTHEAST NEBRASKA AND SOUTHEASTERN SOUTH DAKOTA.

LAT...LON 4416 9751 4399 9772 4419 9787 4425 9777
TIME...MOT...LOC 0152Z 310DEG 15KT 4411 9768

$$

JM

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 7, 7:32 PM CDT	Severe Thunderstorm Warning	FSD	Beadle, Kingsbury, Miner, Sanborn	43 min
Jul 7, 7:51 PM CDT	Severe Thunderstorm Warning	FSD	Lincoln	39 min
Jul 7, 7:56 PM CDT	Flash Flood Warning	FSD	Lincoln, Minnehaha	2 hr
Jul 7, 7:57 PM CDT	Severe Thunderstorm Warning	FSD	Lincoln, Minnehaha, Turner	33 min
Jul 7, 8:51 PM CDT	Tornado Warning	FSD	Miner	24 min
Jul 7, 8:58 PM CDT	Severe Thunderstorm Warning	FSD	Lincoln, Union	32 min
Jul 7, 9:10 PM CDT	Flash Flood Warning	FSD	Union	3 hr
Jul 7, 9:14 PM CDT	Severe Thunderstorm Warning	FSD	Beadle, Miner, Sanborn	46 min
Jul 7, 9:58 PM CDT	Severe Thunderstorm Warning	FSD	Davison, Hanson, McCook, Miner, Sanborn	47 min
Jul 7, 10:07 PM CDT	Flash Flood Warning	FSD	Clay, Yankton	88 min
Jul 7, 10:49 PM CDT	Severe Thunderstorm Warning	FSD	Union	41 min
Jul 8, 2:12 AM CDT	Flash Flood Warning	FSD	Union	3 hr

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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.