Alert archive / South Dakota / Tornado Warnings in 2011

Tornado Warning 38, NWS Sioux Falls, SD

July 26, 2011Beadle County, South Dakota

NWS Sioux Falls, SD issued this tornado warning at Jul 26, 2011, 9:02 PM CDT for Beadle County, South Dakota. It was in force for 14 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 26, 2011, 9:02 PM CDT (02:02 UTC)
Expired: Jul 26, 2011, 9:16 PM CDT
In force: 14 min
Issued by: NWS Sioux Falls, SD
Area: Storm-based polygon

County Beadle County, SD

The radar

The Aberdeen radar (KABR), 110 km from the middle of the area, began a volume at 02:02 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 26, 9:12 PM CDT	TSTM WND GST 70	Yale, SD
Jul 26, 9:12 PM CDT	TSTM WND GST 70	Yale, 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
Jul 26, 5:43 PM CDT	Severe Thunderstorm Watch	SPC	7 hr
Jul 26, 8:17 PM CDT	Severe Thunderstorm Watch	SPC	8 hr

The nearest sounding before it

Aberdeen, SD (KABR), launched 00:00Z, 2.0 hours before the alert went out and 53 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: 3555 J/kg
Mixed-layer CIN: -42 J/kg
Mixed-layer LCL: 900 m above ground
0-6 km bulk shear: 38 kt
0-1 km storm-relative helicity: 289 m²/s²
0-3 km storm-relative helicity: 399 m²/s²
Significant tornado parameter: 7.2
Supercell composite: 32.6

Open this sounding in Storm Lab

The text

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

792 
WFUS53 KFSD 270202
TORFSD
SDC005-270230-
/O.NEW.KFSD.TO.W.0038.110727T0202Z-110727T0230Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE SIOUX FALLS SD
902 PM CDT TUE JUL 26 2011

THE NATIONAL WEATHER SERVICE IN SIOUX FALLS HAS ISSUED A

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

* UNTIL 930 PM CDT

* AT 902 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS WERE
  TRACKING A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO. THIS
  DANGEROUS STORM WAS LOCATED 7 MILES NORTH OF HURON...AND MOVING
  EAST AT 40 MPH.

* THIS TORNADIC STORM WILL BE NEAR...
  YALE AROUND 915 PM CDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW. MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A
STURDY BUILDING. AVOID WINDOWS. IF IN A MOBILE HOME...A VEHICLE OR
OUTDOORS...MOVE TO THE CLOSEST SUBSTANTIAL SHELTER AND PROTECT
YOURSELF FROM FLYING DEBRIS.

&&

LAT...LON 4459 9786 4441 9786 4443 9828 4450 9830
TIME...MOT...LOC 0202Z 271DEG 36KT 4447 9818

$$

JM

1 follow-up statement

595 
WWUS53 KFSD 270216
SVSFSD

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
916 PM CDT TUE JUL 26 2011

SDC005-270226-
/O.CAN.KFSD.TO.W.0038.000000T0000Z-110727T0230Z/
BEADLE SD-
916 PM CDT TUE JUL 26 2011

...THE TORNADO WARNING FOR EAST CENTRAL BEADLE COUNTY IS CANCELLED...

THE STORM WHICH PROMPTED THE WARNING HAS WEAKENED BELOW SEVERE
LIMITS...AND NO LONGER POSES AN IMMEDIATE THREAT TO LIFE OR PROPERTY.

LAT...LON 4459 9786 4441 9786 4443 9828 4450 9830
TIME...MOT...LOC 0216Z 271DEG 36KT 4447 9798

$$

JM

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 26, 8:07 PM CDT	Severe Thunderstorm Warning	FSD	Beadle, Jerauld	38 min
Jul 26, 8:41 PM CDT	Severe Thunderstorm Warning	FSD	Beadle	49 min
Jul 26, 9:23 PM CDT	Severe Thunderstorm Warning	FSD	Beadle, Jerauld, Kingsbury, Miner, Sanborn	36 min
Jul 26, 10:03 PM CDT	Severe Thunderstorm Warning	FSD	Jerauld	42 min
Jul 26, 10:18 PM CDT	Severe Thunderstorm Warning	FSD	Aurora, Jerauld, Miner, Sanborn	42 min
Jul 26, 10:54 PM CDT	Severe Thunderstorm Warning	FSD	Beadle, Brookings, Kingsbury, Lake, Miner, Sanborn	40 min
Jul 26, 11:42 PM CDT	Severe Thunderstorm Warning	FSD	Lake, McCook, Minnehaha	33 min
Jul 27, 12:16 AM CDT	Severe Thunderstorm Warning	FSD	McCook, Minnehaha	44 min
Jul 27, 3:56 AM CDT	Flash Flood Warning	FSD	Lincoln, Minnehaha	3 hr
Jul 27, 4:17 AM CDT	Flash Flood Warning	FSD	Minnehaha	2 hr
Jul 27, 7:02 AM CDT	River Flood Warning	FSD	Lincoln, Minnehaha	3 hr
Jul 27, 9:39 AM CDT	River Flood Warning	FSD	Lincoln, Union	3 days
Jul 27, 9:39 AM CDT	River Flood Warning	FSD	Union	4 days
Jul 27, 2:49 PM CDT	River Flood Warning	FSD	Minnehaha	19 hr

Nearby

Tornado Warnings in South Dakota, 2011 Every tornado warning in 2011 Tornadoes in 2011

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.