Alert archive / South Dakota / Tornado Warnings in 2011

Tornado Warning 25, NWS Sioux Falls, SD

May 30, 2011Douglas County, Hutchinson County, South Dakota

NWS Sioux Falls, SD issued this tornado warning at May 30, 2011, 7:21 PM CDT for Douglas County, Hutchinson County, South Dakota. It was in force for 24 min. 1 report 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: May 30, 2011, 7:21 PM CDT (00:21 UTC)
Expired: May 30, 2011, 7:45 PM CDT
In force: 24 min
Issued by: NWS Sioux Falls, SD
Area: Storm-based polygon

Counties Douglas County, SD, Hutchinson County, SD

The radar

The Sioux Falls radar (KFSD), 97 km from the middle of the area, began a volume at 00:21 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
May 30, 7:23 PM CDT	HAIL 1.75	4 W Parkston, 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
May 30, 2:08 PM CDT	Tornado Watch	SPC	7 hr

The nearest sounding before it

Aberdeen, SD (KABR), launched 00:00Z, 0.4 hours before the alert went out and 170 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: 1125 J/kg
Mixed-layer CIN: -258 J/kg
Mixed-layer LCL: 775 m above ground
0-6 km bulk shear: 58 kt
0-1 km storm-relative helicity: 90 m²/s²
0-3 km storm-relative helicity: 174 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -1.0

Open this sounding in Storm Lab

The text

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

996 
WFUS53 KFSD 310021
TORFSD
SDC043-067-310045-
/O.NEW.KFSD.TO.W.0025.110531T0021Z-110531T0045Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE SIOUX FALLS SD
721 PM CDT MON MAY 30 2011

THE NATIONAL WEATHER SERVICE IN SIOUX FALLS HAS ISSUED A

* TORNADO WARNING FOR...
  SOUTHEASTERN DOUGLAS COUNTY IN SOUTH CENTRAL SOUTH DAKOTA...
  NORTHWESTERN HUTCHINSON COUNTY IN SOUTHEAST SOUTH DAKOTA...

* UNTIL 745 PM CDT

* AT 721 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS WERE
  TRACKING A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO. THIS
  DANGEROUS STORM WAS LOCATED NEAR DELMONT...OR 23 MILES NORTHEAST OF
  LAKE ANDES...AND MOVING NORTHEAST AT 50 MPH.

* THIS TORNADIC STORM WILL AFFECT MAINLY RURAL AREAS OF NORTHWESTERN
  HUTCHINSON AND SOUTHEASTERN DOUGLAS COUNTIES.

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 4350 9788 4350 9774 4336 9763 4326 9813
      4335 9821
TIME...MOT...LOC 0021Z 235DEG 46KT 4335 9805

$$

WEISSER

1 follow-up statement

083 
WWUS53 KFSD 310031
SVSFSD

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
731 PM CDT MON MAY 30 2011

SDC043-067-310045-
/O.CON.KFSD.TO.W.0025.000000T0000Z-110531T0045Z/
HUTCHINSON SD-DOUGLAS SD-
731 PM CDT MON MAY 30 2011

...A TORNADO WARNING REMAINS IN EFFECT FOR SOUTHEASTERN DOUGLAS AND
NORTHWESTERN HUTCHINSON COUNTIES UNTIL 745 PM CDT...

AT 731 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS WERE TRACKING
A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO.  THIS DANGEROUS
STORM WAS LOCATED NEAR PARKSTON...OR 24 MILES SOUTH OF MITCHELL...
MOVING NORTHEAST AT 50 MPH.

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 4350 9788 4350 9774 4336 9763 4326 9813
      4335 9821
TIME...MOT...LOC 0031Z 232DEG 43KT 4342 9794

$$

WEISSER

The office that day

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

Issued	Product	Office	Counties	Lasted
May 30, 7:05 PM CDT	Severe Thunderstorm Warning	FSD	Bon Homme, Charles Mix, Douglas, Hutchinson	40 min
May 30, 7:29 PM CDT	Severe Thunderstorm Warning	FSD	Bon Homme, Charles Mix, Hutchinson	46 min
May 30, 7:42 PM CDT	Tornado Warning	FSD	Hanson, Hutchinson, McCook	33 min
May 30, 8:05 PM CDT	Tornado Warning	FSD	Lake, McCook, Minnehaha	25 min
May 30, 8:09 PM CDT	Tornado Warning	FSD	Brookings, Kingsbury, Lake, Miner	51 min
May 30, 8:46 PM CDT	Severe Thunderstorm Warning	FSD	Brookings, Lake, Moody	44 min
May 31, 3:48 AM CDT	Wind Advisory	FSD	Aurora, Beadle, Brookings, Brule, Davison, Hanson and 8 more	15 hr
May 31, 10:10 AM CDT	River Flood Warning	FSD	Union	86 days
May 31, 10:41 AM CDT	River Flood Warning	FSD	Turner	24 hr
May 31, 10:41 AM CDT	River Flood Warning	FSD	Clay	24 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.