Alert archive / South Dakota / Severe Thunderstorm Watches in 2003
Severe Thunderstorm Watch 811
The Storm Prediction Center issued this severe thunderstorm watch at Jul 29, 2003, 1:40 PM CDT for 5 counties in Nebraska; 26 counties in South Dakota. It was in force for 5 hr.
The area
The outline as issued.
The facts
- Issued
- Jul 29, 2003, 1:40 PM CDT (18:40 UTC)
- Expired
- Jul 29, 2003, 7:00 PM CDT
- In force
- 5 hr
- Issued by
- the Storm Prediction Center
All 31 counties
Boyd County, NE, Brown County, NE, Cherry County, NE, Keya Paha County, NE, Rock County, NE, Aurora County, SD, Beadle County, SD, Brule County, SD, Buffalo County, SD, Charles Mix County, SD, Clark County, SD, Codington County, SD, Davison County, SD, Douglas County, SD, Faulk County, SD, Grant County, SD, Gregory County, SD, Hamlin County, SD, Hand County, SD, Hanson County, SD, Hughes County, SD, Hyde County, SD, Jerauld County, SD, Kingsbury County, SD, Lyman County, SD, Mellette County, SD, Miner County, SD, Sanborn County, SD, Spink County, SD, Todd County, SD, Tripp County, SD
Warnings issued inside it
15 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 29, 2:35 PM CDT | Severe Thunderstorm Warning | ABR | Hughes, Stanley | 40 min |
| Jul 29, 2:46 PM CDT | Severe Thunderstorm Warning | ABR | Codington | 44 min |
| Jul 29, 2:50 PM CDT | Severe Thunderstorm Warning | ABR | Spink | 40 min |
| Jul 29, 3:07 PM CDT | Severe Thunderstorm Warning | ABR | Faulk, Hand, Spink | 38 min |
| Jul 29, 3:10 PM CDT | Severe Thunderstorm Warning | ABR | Clark | 50 min |
| Jul 29, 3:19 PM CDT | Severe Thunderstorm Warning | UNR | Bennett, Todd | 26 min |
| Jul 29, 3:22 PM CDT | Tornado Warning | ABR | Spink | 38 min |
| Jul 29, 3:42 PM CDT | Severe Thunderstorm Warning | FSD | Beadle | 33 min |
| Jul 29, 4:00 PM CDT | Severe Thunderstorm Warning | ABR | Clark, Spink | 45 min |
| Jul 29, 4:02 PM CDT | Severe Thunderstorm Warning | FSD | Kingsbury | 43 min |
| Jul 29, 4:14 PM CDT | Severe Thunderstorm Warning | ABR | Codington, Grant | 46 min |
| Jul 29, 4:15 PM CDT | Severe Thunderstorm Warning | FSD | Beadle | 30 min |
| Jul 29, 4:40 PM CDT | Severe Thunderstorm Warning | ABR | Hamlin | 50 min |
| Jul 29, 5:12 PM CDT | Severe Thunderstorm Warning | FSD | Miner | 33 min |
| Jul 29, 5:13 PM CDT | Severe Thunderstorm Warning | LBF | Cherry | 32 min |
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, 6.7 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
- 4 J/kg
- Mixed-layer CIN
- -422 J/kg
- Mixed-layer LCL
- 1942 m above ground
- 0-6 km bulk shear
- 25 kt
- 0-1 km storm-relative helicity
- 38 m²/s²
- 0-3 km storm-relative helicity
- 143 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 29, 12:42 PM CDT | Mesoscale Discussion | SPC | Brown, Clark, Day, Edmunds, Faulk, Hand and 8 more | 108 min |
| Jul 29, 3:09 PM CDT | Mesoscale Discussion | SPC | Aurora, Beadle, Brookings, Brule, Buffalo, Clark and 19 more | 2 hr |
| Jul 29, 5:10 PM CDT | Severe Thunderstorm Watch | SPC | Brookings, Clay, Deuel, Lake, Lincoln, Minnehaha and 4 more | 5 hr |
Nearby
Severe Thunderstorm Watches in South Dakota, 2003Severe Thunderstorm Watches in Nebraska, 2003Every severe thunderstorm watch in 2003
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.