Alert archive / Iowa / Tornado Warnings in 2008

Tornado Warning 37, NWS Sioux Falls, SD

June 11, 20085 counties in Iowa

NWS Sioux Falls, SD issued this tornado warning at Jun 11, 2008, 6:28 PM CDT for 5 counties in Iowa. It was in force for 32 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: Jun 11, 2008, 6:28 PM CDT (23:28 UTC)
Expired: Jun 11, 2008, 7:00 PM CDT
In force: 32 min
Issued by: NWS Sioux Falls, SD
Area: Storm-based polygon

Counties Buena Vista County, IA, Cherokee County, IA, Clay County, IA, Dickinson County, IA, O'Brien County, IA

The radar

The Sioux Falls radar (KFSD), 121 km from the middle of the area, began a volume at 23:29 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 11, 6:55 PM CDT	TORNADO	3 Sw Spencer, IA	EXTENSIVE DAMAGE TO FARM...POWER LINES DOWN

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
Jun 11, 2:52 PM CDT	Tornado Watch	SPC	7 hr

The nearest sounding before it

Omaha, NE (KOAX), launched 12:00Z, 11.5 hours before the alert went out and 214 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: 1784 J/kg
Mixed-layer CIN: -93 J/kg
Mixed-layer LCL: 818 m above ground
0-6 km bulk shear: 38 kt
0-1 km storm-relative helicity: 548 m²/s²
0-3 km storm-relative helicity: 862 m²/s²
Significant tornado parameter: 4.9
Supercell composite: 43.9

Open this sounding in Storm Lab

The text

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

000 
WFUS53 KFSD 112329
TORFSD
IAC021-035-041-059-141-120000-
/O.NEW.KFSD.TO.W.0037.080611T2328Z-080612T0000Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE SIOUX FALLS SD
628 PM CDT WED JUN 11 2008

THE NATIONAL WEATHER SERVICE IN SIOUX FALLS HAS ISSUED A

* TORNADO WARNING FOR...
  EXTREME NORTHWESTERN BUENA VISTA COUNTY IN NORTHWEST IOWA
  NORTHEASTERN CHEROKEE COUNTY IN NORTHWEST IOWA
  WESTERN CLAY COUNTY IN NORTHWEST IOWA
  SOUTHWESTERN DICKINSON COUNTY IN NORTHWEST IOWA
  EASTERN OBRIEN COUNTY IN NORTHWEST IOWA

* UNTIL 700 PM CDT

* AT 628 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO 6 MILES SOUTH OF
  HARTLEY...OR 16 MILES WEST OF SPENCER...MOVING NORTHEAST AT 37 MPH.
  ANOTHER STORM WAS DEVELOPING SOUTHEAST OF SUTHERLAND...MOVING
  NORTHEAST AT 35 MPH.

* THE TORNADO WILL BE NEAR...
   HARTLEY AROUND 635 PM CDT...
   EVERLY AROUND 640 PM CDT...

THIS REPLACES THE PREVIOUS WARNING FOR CHEROKEE AND OBRIEN COUNTIES.

THIS IS AN EXTREMELY DANGEROUS AND LIFE THREATENING SITUATION. TAKE
COVER NOW.

LAT...LON 4335 9529 4307 9515 4285 9541 4292 9556
      4307 9560
TIME...MOT...LOC 2328Z 218DEG 32KT 4311 9544

$$

CHAPMAN

2 follow-up statements

000 
WWUS53 KFSD 112346
SVSFSD

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
646 PM CDT WED JUN 11 2008

IAC021-035-041-059-141-120000-
/O.CON.KFSD.TO.W.0037.000000T0000Z-080612T0000Z/
DICKINSON IA-OBRIEN IA-CLAY IA-CHEROKEE IA-BUENA VISTA IA-
646 PM CDT WED JUN 11 2008

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 700 PM CDT FOR EXTREME
NORTHWESTERN BUENA VISTA...NORTHEASTERN CHEROKEE...WESTERN CLAY...
SOUTHEASTERN OBRIEN AND SOUTHWESTERN DICKINSON COUNTIES...

AT 646 PM CDT...TRAINED WEATHER SPOTTERS REPORTED A FUNNEL CLOUD. 
THIS TORNADO WAS LOCATED 3 MILES SOUTH OF ROYAL...OR 10 MILES
SOUTHWEST OF SPENCER...MOVING NORTHEAST AT 36 MPH.

THE TORNADO WILL BE NEAR...
  RURAL AREAS EAST OF ROYAL AROUND 650 PM CDT...
  SOUTHERN SPENCER AROUND 700 PM CDT...

A TORNADO WATCH REMAINS IN EFFECT UNTIL 1000 PM CDT WEDNESDAY EVENING
FOR NORTHWEST IOWA AND SOUTHWEST MINNESOTA AND NORTHEAST NEBRASKA AND
SOUTHEAST SOUTH DAKOTA.

LAT...LON 4285 9541 4292 9556 4308 9540 4335 9529
      4307 9515
TIME...MOT...LOC 2346Z 220DEG 31KT 4305 9522

$$

CHAPMAN

000 
WWUS53 KFSD 120007
SVSFSD

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
707 PM CDT WED JUN 11 2008

IAC021-035-041-059-141-120017-
/O.EXP.KFSD.TO.W.0037.000000T0000Z-080612T0000Z/
DICKINSON IA-OBRIEN IA-CLAY IA-CHEROKEE IA-BUENA VISTA IA-
707 PM CDT WED JUN 11 2008

...THE TORNADO WARNING FOR EXTREME NORTHWESTERN BUENA VISTA...
NORTHEASTERN CHEROKEE...WESTERN CLAY...SOUTHEASTERN OBRIEN AND
SOUTHWESTERN DICKINSON COUNTIES HAS EXPIRED...

THE STORM HAS WEAKENED AND EXITED THE WARNED AREA.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 1000 PM CDT WEDNESDAY EVENING
FOR NORTHWEST IOWA AND SOUTHWEST MINNESOTA AND NORTHEAST NEBRASKA AND
SOUTHEAST SOUTH DAKOTA.

LAT...LON 4285 9541 4292 9556 4308 9540 4335 9529
      4307 9515
TIME...MOT...LOC 2346Z 220DEG 31KT 4305 9521

$$
RSR

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 11, 5:14 AM CDT	Severe Thunderstorm Warning	FSD	Lyon, Sioux	16 min
Jun 11, 6:13 AM CDT	Severe Thunderstorm Warning	FSD	Lyon, O'Brien, Osceola, Sioux	32 min
Jun 11, 6:42 AM CDT	Severe Thunderstorm Warning	FSD	O'Brien, Osceola	33 min
Jun 11, 7:14 AM CDT	Severe Thunderstorm Warning	FSD	Lyon, Osceola	31 min
Jun 11, 10:22 AM CDT	Wind Advisory	FSD	Buena Vista, Cherokee, Clay, Dickinson, Ida, Lyon and 5 more	5 hr
Jun 11, 3:58 PM CDT	Tornado Warning	FSD	Plymouth	32 min
Jun 11, 4:57 PM CDT	Flash Flood Warning	FSD	Cherokee, O'Brien, Osceola	2 hr
Jun 11, 4:57 PM CDT	Severe Thunderstorm Warning	FSD	Cherokee, O'Brien, Plymouth, Sioux	33 min
Jun 11, 5:00 PM CDT	Severe Thunderstorm Warning	FSD	Plymouth, Woodbury	45 min
Jun 11, 5:10 PM CDT	Tornado Warning	FSD	Lyon, Osceola, Sioux	35 min
Jun 11, 5:22 PM CDT	Tornado Warning	FSD	Cherokee, O'Brien, Osceola, Plymouth, Sioux	23 min
Jun 11, 5:27 PM CDT	Tornado Warning	FSD	Cherokee, Plymouth, Woodbury	48 min
Jun 11, 5:30 PM CDT	Flash Flood Warning	FSD	Cherokee, Plymouth, Woodbury	68 min
Jun 11, 5:42 PM CDT	Tornado Warning	FSD	Osceola	48 min
Jun 11, 5:46 PM CDT	Tornado Warning	FSD	Cherokee, O'Brien	44 min
Jun 11, 6:16 PM CDT	Tornado Warning	FSD	Cherokee, Ida, Plymouth, Woodbury	44 min
Jun 11, 6:22 PM CDT	Tornado Warning	FSD	Ida, Woodbury	38 min
Jun 11, 6:37 PM CDT	Severe Thunderstorm Warning	FSD	Buena Vista, Cherokee, Ida	38 min
Jun 11, 6:48 PM CDT	Tornado Warning	FSD	Clay, Dickinson	42 min

Nearby

Tornado Warnings in Iowa, 2008 Every tornado warning in 2008 Tornadoes in 2008

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.