Alert archive / South Dakota / Mesoscale Discussions in 2004
Mesoscale Discussion 378
The Storm Prediction Center issued this mesoscale discussion at Apr 18, 2004, 7:10 PM CDT for Lincoln County, Pipestone County, Rock County, Minnesota; 13 counties in Nebraska; 21 counties in South Dakota. It was in force for 65 min.
The area
The outline as issued.
The facts
- Issued
- Apr 18, 2004, 7:10 PM CDT (00:10 UTC)
- Expired
- Apr 18, 2004, 8:15 PM CDT
- In force
- 65 min
- Issued by
- the Storm Prediction Center
All 37 counties
Lincoln County, MN, Pipestone County, MN, Rock County, MN, Antelope County, NE, Boyd County, NE, Cedar County, NE, Garfield County, NE, Holt County, NE, Knox County, NE, Loup County, NE, Madison County, NE, Pierce County, NE, Rock County, NE, Stanton County, NE, Wayne County, NE, Wheeler County, NE, Aurora County, SD, Beadle County, SD, Bon Homme County, SD, Brookings County, SD, Charles Mix County, SD, Clay County, SD, Davison County, SD, Douglas County, SD, Hanson County, SD, Hutchinson County, SD, Jerauld County, SD, Kingsbury County, SD, Lake County, SD, Lincoln County, SD, McCook County, SD, Miner County, SD, Minnehaha County, SD, Moody County, SD, Sanborn County, SD, Turner County, SD, Yankton County, SD
The radar
The Sioux Falls radar (KFSD), 123 km from the middle of the area, began a volume at 00:12 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 nearest sounding before it
Omaha, NE (KOAX), launched 00:00Z, 0.2 hours before the alert went out and 233 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
- 1099 J/kg
- Mixed-layer CIN
- -135 J/kg
- Mixed-layer LCL
- 1062 m above ground
- 0-6 km bulk shear
- 64 kt
- 0-1 km storm-relative helicity
- 334 m²/s²
- 0-3 km storm-relative helicity
- 385 m²/s²
- Significant tornado parameter
- 1.2
- Supercell composite
- 5.0
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 |
|---|---|---|---|---|
| Apr 18, 7:05 PM CDT | Mesoscale Discussion | SPC | Blue Earth, Cottonwood, Dodge, Faribault, Freeborn, Jackson and 6 more | 115 min |
| Apr 18, 8:28 PM CDT | Mesoscale Discussion | SPC | Brown, Carver, Dakota, Goodhue, Hennepin, Le Sueur and 7 more | 92 min |
| Apr 18, 9:45 PM CDT | Tornado Watch | SPC | Fillmore, Houston, Mower, Olmsted, Wabasha, Winona | 4 hr |
| Apr 18, 11:12 PM CDT | Mesoscale Discussion | SPC | Fillmore, Houston, Mower, Olmsted, Wabasha, Winona | 93 min |
Nearby
Mesoscale Discussions in South Dakota, 2004Mesoscale Discussions in Nebraska, 2004Mesoscale Discussions in Minnesota, 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.