Alert archive / Iowa / Tornado Warnings in 2010

Tornado Warning 7, NWS Sioux Falls, SD

June 1, 2010O'Brien County, Sioux County, Iowa

NWS Sioux Falls, SD issued this tornado warning at Jun 1, 2010, 1:07 PM CDT for O'Brien County, Sioux County, Iowa. It was in force for 23 min. 3 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 1, 2010, 1:07 PM CDT (18:07 UTC)
Expired: Jun 1, 2010, 1:30 PM CDT
In force: 23 min
Issued by: NWS Sioux Falls, SD
Area: Storm-based polygon

Counties O'Brien County, IA, Sioux County, IA

The radar

The Sioux Falls radar (KFSD), 99 km from the middle of the area, began a volume at 18:09 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 1, 1:22 PM CDT	HAIL 1	Sheldon, IA	VERY HEAVY RAIN.
Jun 1, 1:22 PM CDT	TORNADO	4 Wnw Sanborn, IA	BRIEF TOUCHDOWN
Jun 1, 1:26 PM CDT	FUNNEL CLOUD	3 Wnw Sanborn, IA

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Omaha, NE (KOAX), launched 12:00Z, 6.1 hours before the alert went out and 213 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: 1529 J/kg
Mixed-layer CIN: -110 J/kg
Mixed-layer LCL: 815 m above ground
0-6 km bulk shear: 39 kt
0-1 km storm-relative helicity: 80 m²/s²
0-3 km storm-relative helicity: 36 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 2.1

Open this sounding in Storm Lab

The text

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

655 
WFUS53 KFSD 011807
TORFSD
IAC141-167-011830-
/O.NEW.KFSD.TO.W.0007.100601T1807Z-100601T1830Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE SIOUX FALLS SD
107 PM CDT TUE JUN 1 2010

THE NATIONAL WEATHER SERVICE IN SIOUX FALLS HAS ISSUED A

* TORNADO WARNING FOR...
  NORTHERN O'BRIEN COUNTY IN NORTHWEST IOWA...
  EAST CENTRAL SIOUX COUNTY IN NORTHWEST IOWA...

* UNTIL 130 PM CDT

* AT 106 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS WERE
  TRACKING A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO. THIS
  DANGEROUS STORM WAS LOCATED NEAR BOYDEN...OR 13 MILES NORTHEAST OF
  ORANGE CITY...AND MOVING EAST AT 40 MPH.

* THIS TORNADIC STORM WILL BE NEAR...
  SHELDON AROUND 110 PM CDT...
  ARCHER AROUND 115 PM CDT...
  SANBORN AND PRIMGHAR AROUND 125 PM CDT...
  HARTLEY AROUND 130 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 4309 9544 4307 9598 4323 9600 4326 9559
      4325 9548
TIME...MOT...LOC 1806Z 262DEG 34KT 4316 9590

$$

WILLIAMS

1 follow-up statement

258 
WWUS53 KFSD 011819
SVSFSD

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
119 PM CDT TUE JUN 1 2010

IAC141-167-011830-
/O.CON.KFSD.TO.W.0007.000000T0000Z-100601T1830Z/
SIOUX IA-O'BRIEN IA-
119 PM CDT TUE JUN 1 2010

...A TORNADO WARNING REMAINS IN EFFECT FOR NORTHERN O'BRIEN AND EAST
CENTRAL SIOUX COUNTIES UNTIL 130 PM CDT...

AT 119 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS WERE TRACKING
A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO.  THIS DANGEROUS
STORM WAS LOCATED NEAR ARCHER...OR 19 MILES NORTHEAST OF ORANGE
CITY...MOVING EAST AT 40 MPH.

THIS DANGEROUS STORM WILL BE NEAR...
  SANBORN AND PRIMGHAR AROUND 125 PM CDT...
  HARTLEY AROUND 130 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 4309 9544 4307 9598 4323 9600 4326 9559
      4325 9548
TIME...MOT...LOC 1819Z 262DEG 34KT 4318 9573

$$

WILLIAMS

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 1, 1:28 PM CDT	Tornado Warning	FSD	Clay, O'Brien	32 min
Jun 1, 1:59 PM CDT	Tornado Warning	FSD	Clay	31 min
Jun 1, 2:47 PM CDT	Severe Thunderstorm Warning	FSD	Cherokee, Plymouth	28 min
Jun 1, 3:37 PM CDT	Severe Thunderstorm Warning	FSD	Ida, Woodbury	23 min

Nearby

Tornado Warnings in Iowa, 2010 Every tornado warning in 2010 Tornadoes in 2010

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.