Alert archive / South Dakota / Mesoscale Discussions in 2004
Mesoscale Discussion 860
The Storm Prediction Center issued this mesoscale discussion at May 24, 2004, 8:41 AM CDT for Boyd County, Knox County, Nebraska; 35 counties in South Dakota. It was in force for 2 hr.
The area
The outline as issued.
The facts
- Issued
- May 24, 2004, 8:41 AM CDT (13:41 UTC)
- Expired
- May 24, 2004, 10:45 AM CDT
- In force
- 2 hr
- Issued by
- the Storm Prediction Center
All 37 counties
Boyd County, NE, Knox County, NE, Aurora County, SD, Beadle County, SD, Bon Homme County, SD, Brookings County, SD, Brule County, SD, Buffalo County, SD, Charles Mix County, SD, Clark County, SD, Clay County, SD, Codington County, SD, Davison County, SD, Deuel County, SD, Douglas County, SD, Grant County, SD, Gregory County, SD, Hamlin 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, Spink County, SD, Tripp County, SD, Turner County, SD, Yankton County, SD
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, 1.7 hours before the alert went out and 152 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 484 m above ground
- 0-6 km bulk shear
- 52 kt
- 0-1 km storm-relative helicity
- 189 m²/s²
- 0-3 km storm-relative helicity
- 121 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
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 |
|---|---|---|---|---|
| May 24, 9:30 AM CDT | Mesoscale Discussion | SPC | Butler, Cass, Dodge, Douglas, Gage, Jefferson and 13 more | 2 hr |
| May 24, 10:10 AM CDT | Severe Thunderstorm Watch | SPC | Cedar, Dakota, Dixon, Knox, Pierce | 6 hr |
| May 24, 11:30 AM CDT | Tornado Watch | SPC | Adams, Boone, Burt, Butler, Cass, Clay and 33 more | 11 hr |
| May 24, 2:08 PM CDT | Mesoscale Discussion | SPC | Cedar, Dakota, Dixon, Knox, Pierce, Wayne | 67 min |
| May 24, 2:39 PM CDT | Mesoscale Discussion | SPC | Adams, Boone, Burt, Butler, Cass, Clay and 33 more | 96 min |
| May 24, 5:26 PM CDT | Mesoscale Discussion | SPC | Boone, Burt, Butler, Cass, Clay, Colfax and 31 more | 94 min |
Nearby
Mesoscale Discussions in South Dakota, 2004Mesoscale Discussions in Nebraska, 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.