Alert archive / South Dakota / Mesoscale Discussions in 2003
Mesoscale Discussion 1885
The Storm Prediction Center issued this mesoscale discussion at Jul 18, 2003, 3:30 PM MDT for 5 states. It was in force for 90 min.
The area
The outline as issued.
The facts
- Issued
- Jul 18, 2003, 3:30 PM MDT (21:30 UTC)
- Expired
- Jul 18, 2003, 5:00 PM MDT
- In force
- 90 min
- Issued by
- the Storm Prediction Center
All 22 counties
Carter County, MT, Bowman County, ND, Banner County, NE, Box Butte County, NE, Dawes County, NE, Kimball County, NE, Morrill County, NE, Scotts Bluff County, NE, Sheridan County, NE, Sioux County, NE, Butte County, SD, Custer County, SD, Fall River County, SD, Harding County, SD, Lawrence County, SD, Meade County, SD, Oglala Lakota County, SD, Pennington County, SD, Perkins County, SD, Crook County, WY, Goshen County, WY, Niobrara County, WY
The watches that followed
Watches SPC issued over any of the same counties within four hours of this discussion.
The nearest sounding before it
Rapid City, SD (KUNR), launched 12:00Z, 9.5 hours before the alert went out and 72 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
- 1538 J/kg
- Mixed-layer CIN
- -274 J/kg
- Mixed-layer LCL
- 1339 m above ground
- 0-6 km bulk shear
- 20 kt
- 0-1 km storm-relative helicity
- -1 m²/s²
- 0-3 km storm-relative helicity
- 19 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 |
|---|---|---|---|---|
| Jul 17, 6:41 PM MDT | Mesoscale Discussion | SPC | Carter, Dawson, Fallon, McCone, Richland, Roosevelt and 1 more | 94 min |
| Jul 18, 3:45 PM MDT | Severe Thunderstorm Watch | SPC | Carter, Fallon | 5 hr |
| Jul 17, 6:19 PM MDT | Mesoscale Discussion | SPC | Brown, Cherry, Keya Paha, Rock, Sheridan | 116 min |
| Jul 18, 6:13 AM MDT | Mesoscale Discussion | SPC | McLean, Mountrail, Sheridan, Ward | 2 hr |
| Jul 17, 8:05 PM MDT | Severe Thunderstorm Watch | SPC | Butte, Harding, Lawrence, Meade, Pennington, Perkins | 5 hr |
| Jul 17, 10:15 PM MDT | Mesoscale Discussion | SPC | Butte, Harding, Lawrence, Meade, Pennington, Perkins | 90 min |
Nearby
Mesoscale Discussions in South Dakota, 2003Mesoscale Discussions in Nebraska, 2003Mesoscale Discussions in Wyoming, 2003Every mesoscale discussion in 2003
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.