Alert archive / South Dakota / Mesoscale Discussions in 2004
Mesoscale Discussion 1671
The Storm Prediction Center issued this mesoscale discussion at Jul 14, 2004, 3:53 PM MDT for 14 counties in Nebraska; 15 counties in South Dakota; 8 counties in Wyoming. It was in force for 2 hr.
The area
The outline as issued.
The facts
- Issued
- Jul 14, 2004, 3:53 PM MDT (21:53 UTC)
- Expired
- Jul 14, 2004, 6:00 PM MDT
- In force
- 2 hr
- Issued by
- the Storm Prediction Center
All 37 counties
Arthur County, NE, Banner County, NE, Box Butte County, NE, Cherry County, NE, Cheyenne County, NE, Dawes County, NE, Garden County, NE, Grant County, NE, Keith County, NE, Kimball County, NE, Morrill County, NE, Scotts Bluff County, NE, Sheridan County, NE, Sioux County, NE, Bennett County, SD, Butte County, SD, Custer County, SD, Fall River County, SD, Haakon County, SD, Hughes County, SD, Jackson County, SD, Jones County, SD, Lawrence County, SD, Meade County, SD, Mellette County, SD, Oglala Lakota County, SD, Pennington County, SD, Stanley County, SD, Todd County, SD, Campbell County, WY, Converse County, WY, Crook County, WY, Goshen County, WY, Laramie County, WY, Niobrara County, WY, Platte County, WY, Weston County, WY
The radar
The Rapid City radar (KUDX), 162 km from the middle of the area, began a volume at 21:55 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
Denver, CO (KDNR), launched 12:00Z, 9.9 hours before the alert went out and 339 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
- 680 J/kg
- Mixed-layer CIN
- -351 J/kg
- Mixed-layer LCL
- 1429 m above ground
- 0-6 km bulk shear
- 20 kt
- 0-1 km storm-relative helicity
- -30 m²/s²
- 0-3 km storm-relative helicity
- 33 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.1
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 |
|---|---|---|---|---|
| Jul 13, 6:15 PM MDT | Mesoscale Discussion | SPC | Arthur, Banner, Box Butte, Cheyenne, Dawes, Deuel and 9 more | 90 min |
| Jul 13, 8:51 PM MDT | Mesoscale Discussion | SPC | Box Butte, Cherry, Dawes, Hooker, Sheridan, Sioux | 84 min |
| Jul 13, 10:52 PM MDT | Mesoscale Discussion | SPC | Blaine, Boyd, Brown, Cherry, Garfield, Grant and 10 more | 83 min |
| Jul 14, 4:35 PM MDT | Severe Thunderstorm Watch | SPC | Banner, Box Butte, Cheyenne, Dawes, Deuel, Kimball and 3 more | 5 hr |
Nearby
Mesoscale Discussions in South Dakota, 2004Mesoscale Discussions in Nebraska, 2004Mesoscale Discussions in Wyoming, 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.