Alert archive / South Dakota / Tornado Warnings in 2011

Tornado Warning 35, NWS Sioux Falls, SD

July 1, 2011Moody County, South Dakota

NWS Sioux Falls, SD issued this tornado warning at Jul 1, 2011, 3:18 PM CDT for Moody County, South Dakota. It was in force for 27 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 1, 2011, 3:18 PM CDT (20:18 UTC)
Expired: Jul 1, 2011, 3:45 PM CDT
In force: 27 min
Issued by: NWS Sioux Falls, SD
Area: Storm-based polygon

County Moody County, SD

The radar

The Sioux Falls radar (KFSD), 56 km from the middle of the area, began a volume at 20:20 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 1, 3:25 PM CDT	TSTM WND GST 65	6 W Flandreau, SD	4 SEMI-TRAILER TRUCKS AND A CAMPER WERE BLOWN OVER BY WINDS AT THE FLANDREAU EXIT ON INTERSTATE 29.
Jul 1, 3:30 PM CDT	TSTM WND GST 70	Flandreau, SD	STRONG THUNDERSTORM WINDS UPROOTED AND SNAPPED TREES IN FLANDREAU, PRODUCING SIGNIFICANT DAMAGE. NO TRAVEL TO FLANDREAU WAS REQUESTED DUE TO BLOCKED ROADS IN TOWN.

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 1, 2:08 PM CDT	Severe Thunderstorm Watch	SPC	9 hr

The nearest sounding before it

Aberdeen, SD (KABR), launched 12:00Z, 8.3 hours before the alert went out and 163 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: 407 J/kg
Mixed-layer CIN: -374 J/kg
Mixed-layer LCL: 983 m above ground
0-6 km bulk shear: 69 kt
0-1 km storm-relative helicity: -270 m²/s²
0-3 km storm-relative helicity: -229 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.

667 
WFUS53 KFSD 012018
TORFSD
SDC101-012045-
/O.NEW.KFSD.TO.W.0035.110701T2018Z-110701T2045Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE SIOUX FALLS SD
318 PM CDT FRI JUL 1 2011

THE NATIONAL WEATHER SERVICE IN SIOUX FALLS HAS ISSUED A

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

* UNTIL 345 PM CDT

* AT 318 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS WERE
  TRACKING A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO. THIS
  DANGEROUS STORM WAS LOCATED NEAR COLMAN...OR 16 MILES EAST OF
  MADISON...AND MOVING EAST AT 45 MPH.

* THIS TORNADIC STORM WILL BE NEAR...
  FLANDREAU AROUND 330 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 4417 9664 4402 9654 4399 9681 4409 9681
TIME...MOT...LOC 2018Z 251DEG 37KT 4405 9676

$$

WEISSER

1 follow-up statement

584 
WWUS53 KFSD 012041
SVSFSD

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
341 PM CDT FRI JUL 1 2011

SDC101-012052-
/O.EXP.KFSD.TO.W.0035.000000T0000Z-110701T2045Z/
MOODY SD-
341 PM CDT FRI JUL 1 2011

...THE TORNADO WARNING FOR NORTHERN MOODY COUNTY WILL EXPIRE AT 345
PM CDT...

THE STORM WHICH PROMPTED THE WARNING HAS MOVED OUT OF THE WARNED
AREA...HOWEVER HEAVY RAIN IS STILL POSSIBLE WITH THIS THUNDERSTORM.

LAT...LON 4417 9664 4402 9654 4399 9681 4409 9681
TIME...MOT...LOC 2042Z 251DEG 37KT 4413 9643

$$

WEISSER

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 30, 10:07 PM CDT	Severe Thunderstorm Warning	FSD	Brule, Charles Mix, Gregory	38 min
Jun 30, 10:47 PM CDT	Severe Thunderstorm Warning	FSD	Brule	43 min
Jun 30, 11:38 PM CDT	Severe Thunderstorm Warning	FSD	Charles Mix, Douglas, Gregory	37 min
Jul 1, 12:10 PM CDT	Severe Thunderstorm Warning	FSD	Beadle, Jerauld	35 min
Jul 1, 12:40 PM CDT	Severe Thunderstorm Warning	FSD	Beadle	35 min
Jul 1, 1:11 PM CDT	Severe Thunderstorm Warning	FSD	Beadle, Jerauld	49 min
Jul 1, 2:14 PM CDT	Severe Thunderstorm Warning	FSD	Lake, McCook, Miner	46 min
Jul 1, 2:18 PM CDT	Severe Thunderstorm Warning	FSD	Hutchinson, McCook, Turner	42 min
Jul 1, 2:42 PM CDT	Severe Thunderstorm Warning	FSD	Lake, McCook, Minnehaha, Moody	63 min
Jul 1, 3:13 PM CDT	Severe Thunderstorm Warning	FSD	Brookings, Minnehaha, Moody	62 min
Jul 1, 3:31 PM CDT	Tornado Warning	FSD	Moody	29 min
Jul 1, 3:41 PM CDT	Flash Flood Warning	FSD	Brookings, Moody	100 min

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.