Alert archive / South Dakota / Mesoscale Discussions in 2004
Mesoscale Discussion 1851
The Storm Prediction Center issued this mesoscale discussion at Aug 3, 2004, 7:21 AM CDT for Lyon County, Iowa; Pipestone County, Rock County, Minnesota; 23 counties in South Dakota. It was in force for 54 min.
The area
The outline as issued.
The facts
- Issued
- Aug 3, 2004, 7:21 AM CDT (12:21 UTC)
- Expired
- Aug 3, 2004, 8:15 AM CDT
- In force
- 54 min
- Issued by
- the Storm Prediction Center
All 26 counties
Lyon County, IA, Pipestone County, MN, Rock County, MN, Aurora County, SD, Beadle County, SD, Brule County, SD, Buffalo County, SD, Davison County, SD, Douglas County, SD, Hand County, SD, Hanson County, SD, Hughes County, SD, Hutchinson County, SD, Hyde County, SD, Jerauld County, SD, Kingsbury County, SD, Lake County, SD, Lincoln County, SD, Lyman County, SD, McCook County, SD, Miner County, SD, Minnehaha County, SD, Moody County, SD, Sanborn County, SD, Sully County, SD, Turner County, SD
The radar
The Sioux Falls radar (KFSD), 105 km from the middle of the area, began a volume at 12:23 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 watches that followed
Watches SPC issued over any of the same counties within four hours of this discussion.
The nearest sounding before it
Aberdeen, SD (KABR), launched 12:00Z, 0.4 hours before the alert went out and 121 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
- 197 J/kg
- Mixed-layer CIN
- -333 J/kg
- Mixed-layer LCL
- 811 m above ground
- 0-6 km bulk shear
- 29 kt
- 0-1 km storm-relative helicity
- 43 m²/s²
- 0-3 km storm-relative helicity
- 119 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.7
The text
As transmitted, in the capitals the NWS used until 2016.
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</html>SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 3, 2:02 AM CDT | Mesoscale Discussion | SPC | Benton, Black Hawk, Boone, Buena Vista, Butler, Calhoun and 30 more | 118 min |
| Aug 3, 10:48 AM CDT | Mesoscale Discussion | SPC | Allamakee, Black Hawk, Bremer, Buchanan, Buena Vista, Butler and 32 more | 87 min |
| Aug 3, 11:05 AM CDT | Severe Thunderstorm Watch | SPC | Bremer, Buena Vista, Butler, Calhoun, Cerro Gordo, Cherokee and 25 more | 6 hr |
| Aug 3, 1:16 PM CDT | Mesoscale Discussion | SPC | Benton, Black Hawk, Boone, Bremer, Buchanan, Buena Vista and 46 more | 89 min |
| Aug 3, 2:25 PM CDT | Severe Thunderstorm Watch | SPC | Allamakee, Bremer, Butler, Cerro Gordo, Chickasaw, Clayton and 7 more | 5 hr |
| Aug 3, 3:00 PM CDT | Mesoscale Discussion | SPC | Adair, Audubon, Carroll, Cass, Crawford, Greene and 8 more | 2 hr |
| Aug 3, 3:55 PM CDT | Mesoscale Discussion | SPC | Adair, Appanoose, Benton, Black Hawk, Boone, Buchanan and 43 more | 95 min |
| Aug 3, 4:25 PM CDT | Tornado Watch | SPC | Appanoose, Benton, Black Hawk, Boone, Buchanan, Cedar and 39 more | 6 hr |
| Aug 3, 4:52 PM CDT | Mesoscale Discussion | SPC | Adams, Audubon, Cass, Fremont, Harrison, Mills and 5 more | 53 min |
| Aug 3, 5:00 PM CDT | Tornado Watch | SPC | Adair, Adams, Audubon, Cass, Fremont, Guthrie and 9 more | 5 hr |
| Aug 3, 5:07 PM CDT | Mesoscale Discussion | SPC | Allamakee, Clayton, Fayette, Winneshiek | 53 min |
| Aug 3, 5:39 PM CDT | Mesoscale Discussion | SPC | Appanoose, Benton, Black Hawk, Buchanan, Cedar, Clarke and 32 more | 66 min |
| Aug 3, 6:34 PM CDT | Mesoscale Discussion | SPC | Appanoose, Benton, Black Hawk, Buchanan, Cedar, Clinton and 28 more | 86 min |
| Aug 3, 6:45 PM CDT | Mesoscale Discussion | SPC | Adair, Adams, Audubon, Cass, Fremont, Guthrie and 9 more | 90 min |
| Aug 2, 7:47 PM CDT | Mesoscale Discussion | SPC | Aurora, Bennett, Bon Homme, Brule, Buffalo, Charles Mix and 19 more | 58 min |
| Aug 2, 9:07 PM CDT | Mesoscale Discussion | SPC | Butte, Harding, Lawrence, Meade | 53 min |
| Aug 3, 2:30 AM CDT | Mesoscale Discussion | SPC | Haakon, Hughes, Jones, Meade, Stanley, Ziebach | 2 hr |
| Aug 3, 3:00 AM CDT | Severe Thunderstorm Watch | SPC | Buffalo, Haakon, Hughes, Hyde, Jones, Lyman and 4 more | 5 hr |
| Aug 3, 5:04 AM CDT | Mesoscale Discussion | SPC | Buffalo, Haakon, Hughes, Hyde, Jones, Lyman and 2 more | 116 min |
| Aug 3, 8:00 AM CDT | Severe Thunderstorm Watch | SPC | Aurora, Beadle, Brule, Buffalo, Davison, Douglas and 14 more | 5 hr |
| Aug 3, 2:53 PM CDT | Mesoscale Discussion | SPC | Butte, Custer, Harding, Lawrence, Meade, Pennington and 1 more | 2 hr |
Nearby
Mesoscale Discussions in South Dakota, 2004Mesoscale Discussions in Minnesota, 2004Mesoscale Discussions in Iowa, 2004Every mesoscale discussion 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.