Alert archive / South Dakota / Mesoscale Discussions in 2005
Mesoscale Discussion 899
The Storm Prediction Center issued this mesoscale discussion at May 17, 2005, 8:19 PM CDT for 20 counties in Nebraska; 21 counties in South Dakota. It was in force for 116 min.
The area
The outline as issued.
The facts
- Issued
- May 17, 2005, 8:19 PM CDT (01:19 UTC)
- Expired
- May 17, 2005, 10:15 PM CDT
- In force
- 116 min
- Issued by
- the Storm Prediction Center
All 41 counties
Adams County, NE, Antelope County, NE, Boone County, NE, Boyd County, NE, Buffalo County, NE, Cedar County, NE, Garfield County, NE, Greeley County, NE, Hall County, NE, Holt County, NE, Howard County, NE, Kearney County, NE, Knox County, NE, Madison County, NE, Merrick County, NE, Nance County, NE, Pierce County, NE, Sherman County, NE, Valley County, NE, Wheeler County, NE, Aurora County, SD, Beadle County, SD, Bon Homme County, SD, Brule County, SD, Buffalo County, SD, Charles Mix County, SD, Davison County, SD, Douglas County, SD, Faulk County, SD, Hand County, SD, Hanson County, SD, Hutchinson County, SD, Hyde County, SD, Jerauld County, SD, McCook County, SD, Miner County, SD, Potter County, SD, Sanborn County, SD, Sully County, SD, Walworth County, SD, Yankton County, SD
The radar
The North Platte radar (KLNX), 182 km from the middle of the area, began a volume at 01:23 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
Aberdeen, SD (KABR), launched 00:00Z, 1.3 hours before the alert went out and 204 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
- 424 J/kg
- Mixed-layer CIN
- -44 J/kg
- Mixed-layer LCL
- 1524 m above ground
- 0-6 km bulk shear
- 25 kt
- 0-1 km storm-relative helicity
- 64 m²/s²
- 0-3 km storm-relative helicity
- 140 m²/s²
- Significant tornado parameter
- 0.1
- Supercell composite
- 1.6
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 17, 10:40 PM CDT | Mesoscale Discussion | SPC | Adams, Clay, Fillmore, Franklin, Hamilton, Merrick and 5 more | 65 min |
| May 18, 12:58 AM CDT | Mesoscale Discussion | SPC | Burt, Cuming, Dakota, Dodge, Thurston, Washington | 62 min |
| May 18, 12:22 PM CDT | Mesoscale Discussion | SPC | Codington, Day, Deuel, Grant, Marshall, Roberts | 2 hr |
| May 18, 1:25 PM CDT | Severe Thunderstorm Watch | SPC | Brookings, Codington, Deuel, Grant, Hamlin, Marshall and 3 more | 6 hr |
Nearby
Mesoscale Discussions in South Dakota, 2005Mesoscale Discussions in Nebraska, 2005Every mesoscale discussion in 2005
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.