Alert archive / South Dakota / Tornado Warnings in 2007
Tornado Warning 42, NWS Sioux Falls, SD
NWS Sioux Falls, SD issued this tornado warning at Aug 21, 2007, 6:12 PM CDT for Bon Homme County, South Dakota. It was in force for 48 min. No storm report in the archive falls inside the area while it was in force.
The area
The outline as issued.
The facts
- Issued
- Aug 21, 2007, 6:12 PM CDT (23:12 UTC)
- Expired
- Aug 21, 2007, 7:00 PM CDT
- In force
- 48 min
- Issued by
- NWS Sioux Falls, SD
- Area
- Counties, with a storm outline in the text
County Bon Homme County, SD
The radar
The Sioux Falls radar (KFSD), 125 km from the middle of the area, began a volume at 23:13 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.
The watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Aug 21, 3:45 PM CDT | Tornado Watch | SPC | 6 hr |
The nearest sounding before it
Omaha, NE (KOAX), launched 12:00Z, 11.2 hours before the alert went out and 218 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.
- Mixed-layer CAPE
- 174 J/kg
- Mixed-layer CIN
- -479 J/kg
- Mixed-layer LCL
- 1438 m above ground
- 0-6 km bulk shear
- 21 kt
- 0-1 km storm-relative helicity
- 46 m²/s²
- 0-3 km storm-relative helicity
- 61 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
000
WFUS53 KFSD 212312
TORFSD
SDC009-220000-
/O.NEW.KFSD.TO.W.0042.070821T2312Z-070822T0000Z/
BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE SIOUX FALLS SD
612 PM CDT TUE AUG 21 2007
THE NATIONAL WEATHER SERVICE IN SIOUX FALLS HAS ISSUED A
* TORNADO WARNING FOR...
BON HOMME COUNTY IN SOUTHEAST SOUTH DAKOTA
* UNTIL 700 PM CDT
* AT 612 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO 7 MILES
SOUTHWEST OF AVON...OR ABOUT 21 MILES SOUTHEAST OF PICKSTOWN...
MOVING SOUTHEAST AT 30 MPH.
* THE TORNADO WILL BE NEAR...
TYNDALL AROUND 630 PM CDT...
SPRINGFIELD AROUND 635 PM CDT...
TABOR AROUND 645 PM CDT...
THIS WARNING REPLACES THE SEVERE THUNDERSTORM WARNING PREVIOUSLY
ISSUED FOR THE WARNED AREA.
A TORNADO WATCH REMAINS IN EFFECT UNTIL 1000 PM CDT TUESDAY EVENING
FOR NORTHEAST NEBRASKA.
LAT...LON 4285 9768 4287 9772 4286 9788 4278 9796
4277 9800 4285 9816 4286 9813 4293 9810
4294 9812 4298 9809 4304 9811 4311 9766
$$
LIEBL2 follow-up statements
000
WWUS53 KFSD 212330
SVSFSD
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
629 PM CDT TUE AUG 21 2007
SDC009-220000-
/O.CON.KFSD.TO.W.0042.000000T0000Z-070822T0000Z/
BON HOMME SD-
629 PM CDT TUE AUG 21 2007
...A TORNADO WARNING REMAINS IN EFFECT UNTIL 700 PM CDT FOR BON HOMME
COUNTY...
AT 629 PM CDT...WEATHER SERVICE DOPPLER RADAR CONTINUED TO INDICATE A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO. THIS TORNADO WAS
LOCATED 8 MILES SOUTH OF AVON...OR ABOUT 27 MILES SOUTHEAST OF
PICKSTOWN...MOVING SOUTHEAST AT 25 MPH.
THE TORNADO WILL BE NEAR...
TYNDALL AROUND 635 PM CDT...
SPRINGFIELD AROUND 645 PM CDT...
IN ADDITION TO THE TORNADO...THIS STORM IS CAPABLE OF PRODUCING
BASEBALL SIZE HAIL AND DESTRUCTIVE STRAIGHT LINE WINDS.
A TORNADO WATCH REMAINS IN EFFECT UNTIL 1000 PM CDT TUESDAY EVENING
FOR NORTHEAST NEBRASKA.
LAT...LON 4285 9768 4287 9772 4286 9788 4278 9796
4277 9800 4285 9816 4286 9813 4293 9810
4294 9812 4298 9809 4311 9809 4313 9774
$$
LIEBL000
WWUS53 KFSD 212358
SVSFSD
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
658 PM CDT TUE AUG 21 2007
SDC009-220008-
/O.EXP.KFSD.TO.W.0042.000000T0000Z-070822T0000Z/
BON HOMME SD-
658 PM CDT TUE AUG 21 2007
...THE TORNADO WARNING FOR BON HOMME COUNTY EXPIRES AT 700 PM CDT...
...THIS TORNADO WARNING HAS REPLACED BY A SEVERE THUNDERSTORM
WARNING...
A TORNADO WATCH REMAINS IN EFFECT UNTIL 1000 PM CDT TUESDAY EVENING
FOR NORTHEAST NEBRASKA. A TORNADO WATCH ALSO REMAINS IN EFFECT UNTIL
200 AM CDT WEDNESDAY MORNING FOR NORTHWEST IOWA.
LAT...LON 4285 9768 4287 9772 4286 9788 4278 9796
4277 9800 4285 9816 4286 9813 4293 9810
4294 9812 4298 9809 4311 9809 4313 9774
$$
LIEBLThe office that day
Everything else NWS Sioux Falls, SD issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 21, 3:07 AM CDT | Dense Fog Advisory | FSD | Brookings | 4 hr |
| Aug 21, 5:03 PM CDT | Severe Thunderstorm Warning | FSD | Charles Mix | 57 min |
| Aug 21, 5:40 PM CDT | Severe Thunderstorm Warning | FSD | Douglas | 50 min |
| Aug 21, 5:46 PM CDT | Tornado Warning | FSD | Charles Mix | 44 min |
| Aug 21, 5:56 PM CDT | Severe Thunderstorm Warning | FSD | Bon Homme | 64 min |
| Aug 21, 6:02 PM CDT | Severe Thunderstorm Warning | FSD | Hutchinson | 32 min |
| Aug 21, 6:36 PM CDT | Severe Thunderstorm Warning | FSD | Charles Mix | 39 min |
| Aug 21, 6:56 PM CDT | Severe Thunderstorm Warning | FSD | Bon Homme | 49 min |
Nearby
Tornado Warnings in South Dakota, 2007Every tornado warning in 2007Tornadoes in 2007
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.