Alert archive / South Dakota / Mesoscale Discussions in 2015
Mesoscale Discussion 1448
The Storm Prediction Center issued this mesoscale discussion at Jul 17, 2015, 2:36 PM MDT for 21 counties in Nebraska; 22 counties in South Dakota; 4 counties in Wyoming. It was in force for 54 min.
The area
The outline as issued.
The facts
- Issued
- Jul 17, 2015, 2:36 PM MDT (20:36 UTC)
- Expired
- Jul 17, 2015, 3:30 PM MDT
- In force
- 54 min
- Issued by
- the Storm Prediction Center
- Chance of a watch
- 80%
All 47 counties
Arthur County, NE, Banner County, NE, Blaine County, NE, Box Butte County, NE, Brown County, NE, Cherry County, NE, Dawes County, NE, Garden County, NE, Grant County, NE, Hooker County, NE, Keith County, NE, Keya Paha County, NE, Logan County, NE, Loup County, NE, McPherson County, NE, Morrill County, NE, Rock County, NE, Scotts Bluff County, NE, Sheridan County, NE, Sioux County, NE, Thomas County, NE, Bennett County, SD, Brule County, SD, Buffalo County, SD, Custer County, SD, Fall River County, SD, Gregory County, SD, Haakon County, SD, Hughes County, SD, Hyde County, SD, Jackson County, SD, Jones County, SD, Lawrence County, SD, Lyman County, SD, Meade County, SD, Mellette County, SD, Oglala Lakota County, SD, Pennington County, SD, Stanley County, SD, Sully County, SD, Todd County, SD, Tripp County, SD, Ziebach County, SD, Converse County, WY, Goshen County, WY, Niobrara County, WY, Weston County, WY
The radar
The North Platte radar (KLNX), 134 km from the middle of the area, began a volume at 20:37 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 (KRAP), launched 12:00Z, 8.6 hours before the alert went out and 170 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1565 m above ground
- 0-6 km bulk shear
- 34 kt
- 0-1 km storm-relative helicity
- 130 m²/s²
- 0-3 km storm-relative helicity
- 296 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 17, 3:03 PM MDT | Severe Thunderstorm Watch | SPC | Arthur, Banner, Blaine, Box Butte, Brown, Buffalo and 34 more | 8 hr |
| Jul 17, 4:43 PM MDT | Mesoscale Discussion | SPC | Antelope, Boone, Cedar, Colfax, Cuming, Dixon and 12 more | 92 min |
| Jul 17, 5:02 PM MDT | Mesoscale Discussion | SPC | Arthur, Banner, Blaine, Box Butte, Brown, Chase and 28 more | 118 min |
| Jul 17, 12:10 PM MDT | Mesoscale Discussion | SPC | Beadle, Brookings, Brown, Clark, Codington, Day and 17 more | 2 hr |
| Jul 17, 2:43 PM MDT | Severe Thunderstorm Watch | SPC | Beadle, Brookings, Brown, Buffalo, Campbell, Clark and 21 more | 7 hr |
| Jul 16, 7:09 PM MDT | Mesoscale Discussion | SPC | Sheridan | 96 min |
| Jul 17, 3:45 PM MDT | Mesoscale Discussion | SPC | Albany, Carbon, Converse, Laramie, Natrona, Platte and 1 more | 60 min |
Nearby
Mesoscale Discussions in South Dakota, 2015Mesoscale Discussions in Nebraska, 2015Mesoscale Discussions in Wyoming, 2015Every mesoscale discussion in 2015
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.