Alert archive / South Dakota / Mesoscale Discussions in 2003
Mesoscale Discussion 1446
The Storm Prediction Center issued this mesoscale discussion at Jun 21, 2003, 7:54 PM CDT for 31 counties in Nebraska; 34 counties in South Dakota. It was in force for 66 min.
The area
The outline as issued.
The facts
- Issued
- Jun 21, 2003, 7:54 PM CDT (00:54 UTC)
- Expired
- Jun 21, 2003, 9:00 PM CDT
- In force
- 66 min
- Issued by
- the Storm Prediction Center
All 65 counties
Antelope County, NE, Arthur County, NE, Blaine County, NE, Boone County, NE, Boyd County, NE, Brown County, NE, Cherry County, NE, Custer County, NE, Deuel County, NE, Garden County, NE, Garfield County, NE, Grant County, NE, Greeley County, NE, Holt County, NE, Hooker County, NE, Howard County, NE, Keith County, NE, Keya Paha County, NE, Knox County, NE, Lincoln County, NE, Logan County, NE, Loup County, NE, McPherson County, NE, Merrick County, NE, Nance County, NE, Rock County, NE, Sheridan County, NE, Sherman County, NE, Thomas County, NE, Valley County, NE, Wheeler County, NE, Aurora County, SD, Beadle County, SD, Bennett County, SD, Bon Homme County, SD, Brule County, SD, Buffalo County, SD, Charles Mix County, SD, Clark County, SD, Codington County, SD, Davison County, SD, Douglas County, SD, Gregory County, SD, Haakon County, SD, Hamlin County, SD, Hand County, SD, Hanson County, SD, Hughes County, SD, Hutchinson County, SD, Hyde County, SD, Jackson County, SD, Jerauld County, SD, Jones County, SD, Kingsbury County, SD, Lyman County, SD, McCook County, SD, Mellette County, SD, Miner County, SD, Oglala Lakota County, SD, Sanborn County, SD, Spink County, SD, Stanley County, SD, Sully County, SD, Todd County, SD, Tripp County, SD
The radar
The North Platte radar (KLNX), 119 km from the middle of the area, began a volume at 00:53 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
Rapid City, SD (KUNR), launched 00:00Z, 0.9 hours before the alert went out and 183 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
- 911 J/kg
- Mixed-layer CIN
- -48 J/kg
- Mixed-layer LCL
- 1714 m above ground
- 0-6 km bulk shear
- 53 kt
- 0-1 km storm-relative helicity
- 69 m²/s²
- 0-3 km storm-relative helicity
- 166 m²/s²
- Significant tornado parameter
- 0.2
- Supercell composite
- 3.5
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 |
|---|---|---|---|---|
| Jun 21, 8:15 PM CDT | Severe Thunderstorm Watch | SPC | Antelope, Blaine, Boyd, Brown, Cherry, Garfield and 9 more | 6 hr |
| Jun 21, 10:26 PM CDT | Mesoscale Discussion | SPC | Blaine, Boyd, Brown, Garfield, Holt, Keya Paha and 2 more | 94 min |
| Jun 22, 1:27 AM CDT | Mesoscale Discussion | SPC | Antelope, Blaine, Boyd, Brown, Cherry, Garfield and 9 more | 63 min |
| Jun 22, 4:38 AM CDT | Mesoscale Discussion | SPC | Cass, Gage, Jefferson, Johnson, Lancaster, Nemaha and 5 more | 97 min |
| Jun 22, 9:30 AM CDT | Mesoscale Discussion | SPC | Burt, Cass, Cuming, Dodge, Douglas, Gage and 10 more | 3 hr |
| Jun 22, 2:27 PM CDT | Mesoscale Discussion | SPC | Antelope, Boone, Boyd, Butler, Cedar, Colfax and 18 more | 2 hr |
| Jun 22, 3:35 PM CDT | Tornado Watch | SPC | Adams, Antelope, Boone, Boyd, Buffalo, Burt and 57 more | 5 hr |
| Jun 22, 5:29 PM CDT | Mesoscale Discussion | SPC | Adams, Antelope, Boone, Clay, Fillmore, Greeley and 15 more | 61 min |
| Jun 21, 9:13 PM CDT | Mesoscale Discussion | SPC | Brown, Day, Grant, Marshall, Roberts | 92 min |
| Jun 22, 12:45 AM CDT | Mesoscale Discussion | SPC | Brown, Day, Edmunds, Grant, McPherson, Marshall and 1 more | 60 min |
| Jun 22, 1:47 PM CDT | Mesoscale Discussion | SPC | Butte, Custer, Fall River, Harding, Lawrence, Meade and 2 more | 118 min |
| Jun 22, 2:15 PM CDT | Severe Thunderstorm Watch | SPC | Butte, Corson, Custer, Dewey, Fall River, Haakon and 11 more | 7 hr |
| Jun 22, 2:55 PM CDT | Tornado Watch | SPC | Beadle, Brookings, Brown, Clark, Codington, Day and 12 more | 6 hr |
| Jun 22, 5:48 PM CDT | Mesoscale Discussion | SPC | Butte, Corson, Custer, Dewey, Haakon, Harding and 8 more | 117 min |
| Jun 22, 5:59 PM CDT | Mesoscale Discussion | SPC | Beadle, Brookings, Clark, Codington, Day, Deuel and 5 more | 61 min |
Nearby
Mesoscale Discussions in South Dakota, 2003Mesoscale Discussions in Nebraska, 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; radar from the NEXRAD Level II archive.