Alert archive / Nebraska / Tornado Warnings in 2008

Tornado Warning 47, NWS Sioux Falls, SD

July 6, 2008Dakota County, Dixon County, Nebraska; Plymouth County, Woodbury County, Iowa; Union County, South Dakota

NWS Sioux Falls, SD issued this tornado warning at Jul 6, 2008, 4:41 PM CDT for Dakota County, Dixon County, Nebraska; Plymouth County, Woodbury County, Iowa; Union County, South Dakota. It was in force for 34 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: Jul 6, 2008, 4:41 PM CDT (21:41 UTC)
Expired: Jul 6, 2008, 5:15 PM CDT
In force: 34 min
Issued by: NWS Sioux Falls, SD
Area: Storm-based polygon

Counties Plymouth County, IA, Woodbury County, IA, Dakota County, NE, Dixon County, NE, Union County, SD

The radar

The Sioux Falls radar (KFSD), 114 km from the middle of the area, began a volume at 21:41 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 6, 4:45 PM CDT	TSTM WND DMG	1 Sw North Sioux City, SD	10-15 TREE LIMBS DOWNED AT MCCOOK LAKE.
Jul 6, 4:50 PM CDT	TSTM WND DMG	6 Nw Sioux City, IA	MINOR TREE DAMAGE IN STONE STATE PARK
Jul 6, 4:50 PM CDT	TORNADO	4 Nw Sioux City, IA	TORNADO TOUCHDOWN BRIEFLY IN OPEN AREA NEAR STONE STATE PARK.

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 6, 3:05 PM CDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Omaha, NE (KOAX), launched 12:00Z, 9.7 hours before the alert went out and 141 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: 2155 J/kg
Mixed-layer CIN: -356 J/kg
Mixed-layer LCL: 1374 m above ground
0-6 km bulk shear: 20 kt
0-1 km storm-relative helicity: 176 m²/s²
0-3 km storm-relative helicity: 130 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.

000 
WFUS53 KFSD 062141
TORFSD
IAC149-193-NEC043-051-SDC127-062215-
/O.NEW.KFSD.TO.W.0047.080706T2141Z-080706T2215Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE SIOUX FALLS SD
441 PM CDT SUN JUL 6 2008

THE NATIONAL WEATHER SERVICE IN SIOUX FALLS HAS ISSUED A

* TORNADO WARNING FOR...
  NORTHERN DAKOTA COUNTY IN NORTHEAST NEBRASKA
  EAST CENTRAL DIXON COUNTY IN NORTHEAST NEBRASKA
  SOUTH CENTRAL PLYMOUTH COUNTY IN NORTHWEST IOWA
  NORTHWESTERN WOODBURY COUNTY IN NORTHWEST IOWA
  SOUTHEASTERN UNION COUNTY IN SOUTHEAST SOUTH DAKOTA

* UNTIL 515 PM CDT

* AT 441 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO 4 MILES
  SOUTHEAST OF PONCA...OR NEAR PONCA...MOVING EAST AT 20 MPH.

* THE TORNADO WILL BE NEAR...
   JEFFERSON AROUND 450 PM CDT...
   NORTH SIOUX CITY AROUND 500 PM CDT...
   SIOUX CITY...SOUTH SIOUX CITY AROUND 510 PM CDT...
   HINTON AROUND 515 PM CDT...

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

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

LAT...LON 4271 9623 4247 9617 4243 9671 4260 9676
TIME...MOT...LOC 2141Z 259DEG 17KT 4253 9661

$$
RSR

1 follow-up statement

000 
WWUS53 KFSD 062157
SVSFSD

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
456 PM CDT SUN JUL 6 2008

IAC149-193-SDC127-062215-
/O.CON.KFSD.TO.W.0047.000000T0000Z-080706T2215Z/
PLYMOUTH IA-WOODBURY IA-UNION SD-
456 PM CDT SUN JUL 6 2008

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 515 PM CDT FOR
SOUTHEASTERN UNION...NORTHWESTERN WOODBURY AND SOUTH CENTRAL PLYMOUTH
COUNTIES...

AT 456 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A TORNADO.  THIS TORNADO WAS LOCATED 5 MILES NORTHEAST OF
NORTH SIOUX CITY...OR 6 MILES NORTH OF SIOUX CITY...MOVING NORTHEAST
AT 30 MPH.

THE TORNADO WILL BE NEAR...
   HINTON...LAWTON AROUND 510 PM CDT...

AT 455 PM CDT...A TORNADO TOUCHDOWN WAS REPORTED ON THE NORTHWEST 
SIDE OF SIOUX CITY.

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

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

LAT...LON 4247 9640 4248 9641 4249 9650 4252 9655
      4252 9657 4263 9662 4271 9623 4247 9617
      4246 9640
TIME...MOT...LOC 2156Z 244DEG 25KT 4259 9643

$$
RSR

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 6, 3:57 PM CDT	Severe Thunderstorm Warning	FSD	Dixon	33 min
Jul 6, 3:52 PM CDT	Severe Thunderstorm Warning	FSD	Woodbury	38 min
Jul 6, 4:02 PM CDT	Severe Thunderstorm Warning	FSD	Buena Vista	43 min
Jul 6, 4:29 PM CDT	Severe Thunderstorm Warning	FSD	Woodbury	46 min
Jul 6, 4:34 PM CDT	Flash Flood Warning	FSD	Cherokee, Woodbury	116 min
Jul 6, 4:41 PM CDT	Flash Flood Warning	FSD	Buena Vista, Cherokee, Ida	100 min
Jul 6, 5:05 PM CDT	Severe Thunderstorm Warning	FSD	Cherokee, Ida, Plymouth, Woodbury	40 min
Jul 6, 5:11 PM CDT	Tornado Warning	FSD	Plymouth	34 min
Jul 6, 5:14 PM CDT	Flash Flood Warning	FSD	Buena Vista, Cherokee, Plymouth	86 min
Jul 6, 5:32 PM CDT	Tornado Warning	FSD	Aurora, Davison, Hanson	28 min
Jul 6, 5:50 PM CDT	Flash Flood Warning	FSD	Aurora, Davison, Hanson	3 hr

Nearby

Tornado Warnings in Nebraska, 2008 Tornado Warnings in Iowa, 2008 Tornado Warnings in South Dakota, 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.