Alert archive / South Dakota / Severe Thunderstorm Watches in 2004
Severe Thunderstorm Watch 681
The Storm Prediction Center issued this severe thunderstorm watch at Aug 1, 2004, 6:35 PM CDT for 10 counties in South Dakota. It was in force for 3 hr.
The area
The outline as issued.
The facts
- Issued
- Aug 1, 2004, 6:35 PM CDT (23:35 UTC)
- Expired
- Aug 1, 2004, 10:00 PM CDT
- In force
- 3 hr
- Issued by
- the Storm Prediction Center
Counties Brown County, SD, Campbell County, SD, Corson County, SD, Dewey County, SD, Edmunds County, SD, Faulk County, SD, McPherson County, SD, Potter County, SD, Spink County, SD, Walworth County, SD
The radar
The Aberdeen radar (KABR), 133 km from the middle of the area, began a volume at 23:36 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
4 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 1, 6:44 PM CDT | Severe Thunderstorm Warning | ABR | Corson | 61 min |
| Aug 1, 7:42 PM CDT | Severe Thunderstorm Warning | ABR | Corson, Dewey | 63 min |
| Aug 1, 8:43 PM CDT | Severe Thunderstorm Warning | ABR | Dewey | 47 min |
| Aug 1, 9:15 PM CDT | Severe Thunderstorm Warning | ABR | Potter, Sully | 45 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
Bismarck Municip, ND (KBIS), launched 12:00Z, 11.6 hours before the alert went out and 139 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
- 96 J/kg
- Mixed-layer CIN
- -236 J/kg
- Mixed-layer LCL
- 1468 m above ground
- 0-6 km bulk shear
- 41 kt
- 0-1 km storm-relative helicity
- -12 m²/s²
- 0-3 km storm-relative helicity
- 45 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 31, 8:19 PM CDT | Mesoscale Discussion | SPC | Minnehaha | 56 min |
| Jul 31, 9:45 PM CDT | Severe Thunderstorm Watch | SPC | Lincoln, Union | 5 hr |
| Jul 31, 10:27 PM CDT | Mesoscale Discussion | SPC | Bon Homme, Charles Mix, Douglas, Gregory, Hutchinson, Todd and 3 more | 93 min |
| Aug 1, 1:48 PM CDT | Mesoscale Discussion | SPC | Beadle, Bon Homme, Brookings, Brown, Clark, Clay and 23 more | 117 min |
| Aug 1, 3:15 PM CDT | Tornado Watch | SPC | Brookings, Codington, Day, Deuel, Grant, Hamlin and 5 more | 7 hr |
Nearby
Severe Thunderstorm Watches in South Dakota, 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.