Alert archive / South Dakota / Tornado Warnings in 2008

Tornado Warning 7, NWS Sioux Falls, SD

May 1, 2008Lincoln County, Minnehaha County, South Dakota; Lyon County, Sioux County, Iowa; Nobles County, Rock County, Minnesota

NWS Sioux Falls, SD issued this tornado warning at May 1, 2008, 7:22 PM CDT for Lincoln County, Minnehaha County, South Dakota; Lyon County, Sioux County, Iowa; Nobles County, Rock County, Minnesota. 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: May 1, 2008, 7:22 PM CDT (00:22 UTC)
Expired: May 1, 2008, 7:45 PM CDT
In force: 23 min
Issued by: NWS Sioux Falls, SD
Area: Storm-based polygon

Counties Lyon County, IA, Sioux County, IA, Nobles County, MN, Rock County, MN, Lincoln County, SD, Minnehaha County, SD

The radar

The Sioux Falls radar (KFSD), 36 km from the middle of the area, began a volume at 00:25 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 1, 7:30 PM CDT	TORNADO	1 E Doon, IA
May 1, 7:30 PM CDT	TORNADO	4 Sw Rock Rapids, IA	TORNADO VISIBLE FROM HWY 9 BETWEEN LESTER AND ROCK RAPIDS, ABOUT 6 MILES SOUTH.
May 1, 7:44 PM CDT	TORNADO	2 W George, IA	TORNADO MOVING NORTH.

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 1, 4:34 PM CDT	Tornado Watch	SPC	5 hr

The nearest sounding before it

Aberdeen, SD (KABR), launched 00:00Z, 0.4 hours before the alert went out and 230 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1220 m above ground
0-6 km bulk shear: 38 kt
0-1 km storm-relative helicity: 270 m²/s²
0-3 km storm-relative helicity: 338 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

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

000 
WFUS53 KFSD 020023
TORFSD
IAC119-167-MNC105-133-SDC083-099-020045-
/O.NEW.KFSD.TO.W.0007.080502T0022Z-080502T0045Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE SIOUX FALLS SD
722 PM CDT THU MAY 1 2008

THE NATIONAL WEATHER SERVICE IN SIOUX FALLS HAS ISSUED A

* TORNADO WARNING FOR...
  LYON COUNTY IN NORTHWEST IOWA
  NORTH CENTRAL SIOUX COUNTY IN NORTHWEST IOWA
  NORTHEASTERN LINCOLN COUNTY IN SOUTHEAST SOUTH DAKOTA
  SOUTHEASTERN MINNEHAHA COUNTY IN SOUTHEAST SOUTH DAKOTA
  SOUTHWESTERN NOBLES COUNTY IN SOUTHWEST MINNESOTA
  SOUTHERN ROCK COUNTY IN SOUTHWEST MINNESOTA

* UNTIL 745 PM CDT

* AT 722 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING
  A LINE OF THUNDERSTORMS CAPABLE OF PRODUCING TORNADOES EXTENDING 
  FROM HARRISBURG TO 6 MILES SOUTH OF LARCHWOOD TO DOON TO 4 MILES 
  SOUTHWEST OF BOYDEN...OR ALONG A LINE EXTENDING FROM 9 MILES 
  SOUTHEAST OF SIOUX FALLS TO 9 MILES NORTHEAST OF CANTON TO 12 
  MILES SOUTH OF ROCK RAPIDS TO 10 MILES NORTH OF ORANGE 
  CITY...MOVING NORTHEAST AT 28 MPH.

* TORNADO PRODUCING STORMS WILL BE NEAR...
   LARCHWOOD...BOYDEN AROUND 730 PM CDT...
   LESTER...ROWENA...SIOUX FALLS EAST OF I229 AROUND 735 PM CDT...
   BRANDON...ROCK RAPIDS AROUND 740 PM CDT...
   GEORGE...VALLEY SPRINGS...BEAVER CREEK...ELLSWORTH AROUND 745 PM
   CDT...

A TORNADO WATCH REMAINS IN EFFECT UNTIL 1100 PM CDT THURSDAY EVENING
FOR NORTHWEST IOWA AND SOUTHWEST MINNESOTA AND SOUTHEASTERN SOUTH
DAKOTA.

LAT...LON 4373 9667 4368 9619 4355 9596 4342 9593
      4312 9600 4322 9623 4333 9647 4342 9670
TIME...MOT...LOC 0022Z 212DEG 24KT 4344 9664 4338 9642
          4326 9619 4316 9606

$$

SCHUMACHER

1 follow-up statement

000 
WWUS53 KFSD 020034
SVSFSD

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
733 PM CDT THU MAY 1 2008

IAC119-167-MNC105-133-SDC083-099-020045-
/O.CON.KFSD.TO.W.0007.000000T0000Z-080502T0045Z/
LYON IA-SIOUX IA-ROCK MN-NOBLES MN-MINNEHAHA SD-LINCOLN SD-
733 PM CDT THU MAY 1 2008

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 745 PM CDT FOR NORTH
CENTRAL LINCOLN...SOUTHEASTERN MINNEHAHA...SOUTHWESTERN NOBLES...
SOUTHERN ROCK...NORTH CENTRAL SIOUX AND LYON COUNTIES...

AT 733 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A LINE OF TORNADO PRODUCING STORMS.  THESE TORNADO PRODUCING
STORMS WERE LOCATED ALONG A LINE EXTENDING FROM 4 MILES SOUTHWEST OF
ROWENA TO LESTER TO 4 MILES EAST OF DOON TO BOYDEN...OR ALONG A LINE
EXTENDING FROM 8 MILES SOUTHEAST OF SIOUX FALLS TO 11 MILES WEST OF
ROCK RAPIDS TO 9 MILES SOUTH OF ROCK RAPIDS TO 14 MILES NORTH OF
ORANGE CITY...MOVING NORTHEAST AT 28 MPH.

TORNADO PRODUCING STORMS WILL BE NEAR...
  SIOUX FALLS EAST OF I229 THROUGH 735 PM CDT... 
  HILLS...GEORGE...ROCK RAPIDS...STEEN AROUND 745 PM CDT...

AT 730 PM CDT...A WEATHER SPOTTER REPORTED A TORNADO 1.5 MILES EAST 
OF DOON IN LYON COUNTY.

THERE ARE SEVERAL STORMS CAPABLE OF PRODUCING TORNADOES APPROACHING 
BEAVER CREEK...EAST SIDE OF SIOUX FALLS...LARCHWOOD AND ROCK 
RAPIDS.  

A TORNADO HAS BEEN CONFIRMED. TAKE COVER IN A STURDY BUILDING NOW.
MOBILE HOMES AND VEHICLES ARE NOT SAFE.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 1100 PM CDT THURSDAY EVENING
FOR NORTHWEST IOWA AND SOUTHWEST MINNESOTA AND SOUTHEASTERN SOUTH
DAKOTA.

LAT...LON 4312 9600 4338 9641 4346 9669 4373 9667
      4368 9619 4355 9596 4342 9593
TIME...MOT...LOC 0033Z 212DEG 24KT 4350 9659 4344 9637
          4332 9614 4322 9601

$$

PS

The office that day

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

Issued	Product	Office	Counties	Lasted
May 1, 7:08 PM CDT	Tornado Warning	FSD	Turner	29 min
May 1, 7:16 PM CDT	Severe Thunderstorm Warning	FSD	McCook, Minnehaha, Turner	44 min
May 1, 7:25 PM CDT	Tornado Warning	FSD	McCook, Minnehaha, Turner	35 min
May 1, 7:27 PM CDT	Severe Thunderstorm Warning	FSD	Minnehaha	33 min
May 1, 7:45 PM CDT	Tornado Warning	FSD	Minnehaha	30 min
May 1, 7:53 PM CDT	Severe Thunderstorm Warning	FSD	Minnehaha, Moody	24 min
May 1, 7:59 PM CDT	Tornado Warning	FSD	Minnehaha	14 min
May 1, 8:24 PM CDT	Severe Thunderstorm Warning	FSD	Beadle, Sanborn	36 min
May 1, 8:55 PM CDT	Severe Thunderstorm Warning	FSD	Beadle, Jerauld	21 min
May 2, 2:48 PM CDT	River Flood Warning	FSD	Union	18 hr
May 2, 2:48 PM CDT	River Flood Warning	FSD	Lincoln, Union	18 hr
May 2, 3:49 PM CDT	Wind Advisory	FSD	Aurora, Beadle, Bon Homme, Brookings, Brule, Charles Mix and 18 more	12 hr
May 1, 7:39 PM CDT	Tornado Warning	FSD	Lyon, O'Brien, Osceola	36 min
May 1, 8:16 PM CDT	Tornado Warning	FSD	Lyon, O'Brien, Osceola	29 min
May 2, 2:48 PM CDT	River Flood Warning	FSD	Clay, Dickinson	7 days
May 2, 2:48 PM CDT	River Flood Warning	FSD	Buena Vista	7 days
May 1, 7:58 PM CDT	Severe Thunderstorm Warning	FSD	Lincoln, Lyon	26 min

Nearby

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