Alert archive / South Dakota / Severe Thunderstorm Watches in 2004
Severe Thunderstorm Watch 189
The Storm Prediction Center issued this severe thunderstorm watch at May 11, 2004, 6:40 PM CDT for 11 counties in Nebraska; 18 counties in South Dakota. It was in force for 6 hr.
The area
The outline as issued.
The facts
- Issued
- May 11, 2004, 6:40 PM CDT (23:40 UTC)
- Expired
- May 12, 2004, 1:00 AM CDT
- In force
- 6 hr
- Issued by
- the Storm Prediction Center
All 29 counties
Antelope County, NE, Blaine County, NE, Boyd County, NE, Brown County, NE, Holt County, NE, Keya Paha County, NE, Knox County, NE, Loup County, NE, Pierce County, NE, Rock County, NE, Thomas County, NE, Aurora County, SD, Bon Homme County, SD, Brule County, SD, Buffalo County, SD, Charles Mix County, SD, Davison County, SD, Douglas County, SD, Gregory County, SD, Hanson County, SD, Hutchinson County, SD, Jerauld County, SD, Kingsbury County, SD, Lyman County, SD, Mellette County, SD, Miner County, SD, Sanborn County, SD, Todd County, SD, Tripp County, SD
The radar
The North Platte radar (KLNX), 160 km from the middle of the area, began a volume at 23:41 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.
Warnings issued inside it
6 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 11, 6:41 PM CDT | Severe Thunderstorm Warning | UNR | Todd | 64 min |
| May 11, 6:46 PM CDT | Severe Thunderstorm Warning | ABR | Lyman, Stanley | 29 min |
| May 11, 7:13 PM CDT | Severe Thunderstorm Warning | ABR | Lyman | 32 min |
| May 11, 7:18 PM CDT | Severe Thunderstorm Warning | UNR | Tripp | 57 min |
| May 11, 7:55 PM CDT | Severe Thunderstorm Warning | ABR | Buffalo, Lyman | 35 min |
| May 11, 8:42 PM CDT | Flash Flood Warning | UNR | Todd | 3 hr |
Discussions around it
SPC mesoscale discussions over the same counties from four hours before the watch to its end.
The nearest sounding before it
Aberdeen, SD (KABR), launched 12:00Z, 11.7 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.
- Mixed-layer CAPE
- 48 J/kg
- Mixed-layer CIN
- -312 J/kg
- Mixed-layer LCL
- 1079 m above ground
- 0-6 km bulk shear
- 36 kt
- 0-1 km storm-relative helicity
- 355 m²/s²
- 0-3 km storm-relative helicity
- 454 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 1.9
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 10, 8:06 PM CDT | Mesoscale Discussion | SPC | Banner, Box Butte, Cheyenne, Dawes, Deuel, Garden and 5 more | 114 min |
| May 10, 8:30 PM CDT | Severe Thunderstorm Watch | SPC | Banner, Kimball, Scotts Bluff | 5 hr |
| May 10, 10:19 PM CDT | Mesoscale Discussion | SPC | Banner, Scotts Bluff, Sioux | 116 min |
| May 10, 10:45 PM CDT | Severe Thunderstorm Watch | SPC | Arthur, Box Butte, Chase, Cheyenne, Custer, Dawes and 21 more | 4 hr |
| May 11, 1:27 AM CDT | Mesoscale Discussion | SPC | Arthur, Brown, Cherry, Grant, Hooker, Keya Paha and 3 more | 63 min |
| May 11, 1:32 PM CDT | Mesoscale Discussion | SPC | Cherry, Dawes, Sheridan | 118 min |
| May 11, 1:55 PM CDT | Severe Thunderstorm Watch | SPC | Arthur, Cherry, Garden, Grant, Hooker, Keith and 4 more | 5 hr |
| May 11, 2:00 PM CDT | Mesoscale Discussion | SPC | Chase, Dundy, Hayes, Hitchcock | 2 hr |
| May 11, 2:40 PM CDT | Tornado Watch | SPC | Chase, Dawson, Dundy, Frontier, Furnas, Gosper and 5 more | 6 hr |
| May 11, 5:04 PM CDT | Mesoscale Discussion | SPC | Cherry, Grant, Hooker, Keya Paha | 116 min |
| May 11, 5:20 PM CDT | Mesoscale Discussion | SPC | Frontier, Hayes, Hitchcock, Lincoln, Red Willow | 115 min |
| May 11, 3:55 PM CDT | Tornado Watch | SPC | Beadle, Brown, Clark, Codington, Day, Deuel and 10 more | 5 hr |
| May 11, 5:37 PM CDT | Mesoscale Discussion | SPC | Brown, Day, Edmunds, McPherson, Marshall, Roberts | 113 min |
| May 11, 6:53 PM CDT | Mesoscale Discussion | SPC | Aurora, Beadle, Brule, Buffalo, Charles Mix, Clark and 18 more | 2 hr |
Nearby
Severe Thunderstorm Watches in South Dakota, 2004Severe Thunderstorm Watches in Nebraska, 2004Every severe thunderstorm watch in 2004
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.