Alert archive / Nebraska / Mesoscale Discussions in 2018
Mesoscale Discussion 447
The Storm Prediction Center issued this mesoscale discussion at May 17, 2018, 6:47 PM MDT for Logan County, Phillips County, Sedgwick County, Colorado; 15 counties in Nebraska; Bennett County, Fall River County, Oglala Lakota County, South Dakota. It was in force for 58 min.
The area
The outline as issued.
The facts
- Issued
- May 17, 2018, 6:47 PM MDT (00:47 UTC)
- Expired
- May 17, 2018, 7:45 PM MDT
- In force
- 58 min
- Issued by
- the Storm Prediction Center
All 21 counties
Logan County, CO, Phillips County, CO, Sedgwick County, CO, Arthur County, NE, Banner County, NE, Box Butte County, NE, Cheyenne County, NE, Dawes County, NE, Deuel County, NE, Garden County, NE, Grant County, NE, Keith County, NE, Kimball County, NE, Morrill County, NE, Perkins County, NE, Scotts Bluff County, NE, Sheridan County, NE, Sioux County, NE, Bennett County, SD, Fall River County, SD, Oglala Lakota County, SD
The radar
The North Platte radar (KLNX), 187 km from the middle of the area, began a volume at 00:48 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
N. Platte/Lee Bi, NE (KLBF), launched 00:00Z, 0.8 hours before the alert went out and 224 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
- 1242 J/kg
- Mixed-layer CIN
- -26 J/kg
- Mixed-layer LCL
- 2392 m above ground
- 0-6 km bulk shear
- 29 kt
- 0-1 km storm-relative helicity
- 8 m²/s²
- 0-3 km storm-relative helicity
- 220 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 4.7
The text
As transmitted.
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</html>SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 17, 9:03 PM MDT | Mesoscale Discussion | SPC | Sedgwick | 117 min |
| May 18, 1:43 PM MDT | Mesoscale Discussion | SPC | Baca, Bent, Kiowa, Prowers | 2 hr |
| May 18, 3:02 PM MDT | Severe Thunderstorm Watch | SPC | Baca, Bent, Cheyenne, Crowley, El Paso, Huerfano and 6 more | 7 hr |
| May 18, 3:06 PM MDT | Mesoscale Discussion | SPC | Adams, Arapahoe, Boulder, Broomfield, Denver, Jefferson and 4 more | 114 min |
| May 18, 1:50 PM MDT | Mesoscale Discussion | SPC | Scotts Bluff, Sioux | 115 min |
| May 18, 5:04 PM MDT | Mesoscale Discussion | SPC | Banner, Box Butte, Dawes, Morrill, Scotts Bluff, Sioux | 86 min |
| May 18, 5:27 PM MDT | Mesoscale Discussion | SPC | Dundy, Hitchcock, Red Willow | 63 min |
| May 17, 7:11 PM MDT | Mesoscale Discussion | SPC | Bennett, Buffalo, Dewey, Edmunds, Fall River, Faulk and 17 more | 64 min |
Nearby
Mesoscale Discussions in Nebraska, 2018Mesoscale Discussions in Colorado, 2018Mesoscale Discussions in South Dakota, 2018Every mesoscale discussion in 2018
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.