Alert archive / Nebraska / Mesoscale Discussions in 2007
Mesoscale Discussion 527
The Storm Prediction Center issued this mesoscale discussion at Apr 21, 2007, 4:57 PM MDT for Phillips County, Sedgwick County, Colorado; 29 counties in Nebraska. It was in force for 2 hr.
The area
The outline as issued.
The facts
- Issued
- Apr 21, 2007, 4:57 PM MDT (22:57 UTC)
- Expired
- Apr 21, 2007, 7:00 PM MDT
- In force
- 2 hr
- Issued by
- the Storm Prediction Center
All 31 counties
Phillips County, CO, Sedgwick County, CO, Arthur County, NE, Blaine County, NE, Boyd County, NE, Brown County, NE, Chase County, NE, Cherry County, NE, Custer County, NE, Dawson County, NE, Deuel County, NE, Frontier County, NE, Garden County, NE, Garfield County, NE, Gosper County, NE, Grant County, NE, Hayes County, NE, Holt County, NE, Hooker County, NE, Keith County, NE, Keya Paha County, NE, Lincoln County, NE, Logan County, NE, Loup County, NE, McPherson County, NE, Perkins County, NE, Rock County, NE, Sherman County, NE, Thomas County, NE, Valley County, NE, Wheeler County, NE
The radar
The North Platte radar (KLNX), 61 km from the middle of the area, began a volume at 22:57 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 12:00Z, 11.0 hours before the alert went out and 32 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
- 58 J/kg
- Mixed-layer CIN
- -409 J/kg
- Mixed-layer LCL
- 1516 m above ground
- 0-6 km bulk shear
- 33 kt
- 0-1 km storm-relative helicity
- 284 m²/s²
- 0-3 km storm-relative helicity
- 277 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 |
|---|---|---|---|---|
| Apr 21, 12:35 PM MDT | Mesoscale Discussion | SPC | Sedgwick | 55 min |
| Apr 21, 12:57 PM MDT | Tornado Watch | SPC | Phillips, Sedgwick | 9 hr |
| Apr 21, 1:44 PM MDT | Mesoscale Discussion | SPC | Baca, Bent, Cheyenne, Kiowa, Kit Carson, Lincoln and 1 more | 91 min |
| Apr 21, 2:10 PM MDT | Tornado Watch | SPC | Baca, Bent, Cheyenne, Kiowa, Kit Carson, Prowers and 1 more | 7 hr |
| Apr 21, 5:10 PM MDT | Mesoscale Discussion | SPC | Baca, Bent, Cheyenne, Kiowa, Kit Carson, Prowers and 1 more | 2 hr |
| Apr 20, 7:45 PM MDT | Severe Thunderstorm Watch | SPC | Blaine, Boyd, Brown, Chase, Cherry, Custer and 19 more | 5 hr |
| Apr 21, 12:31 AM MDT | Mesoscale Discussion | SPC | Boyd | 59 min |
| Apr 21, 5:11 AM MDT | Mesoscale Discussion | SPC | Frontier, Hitchcock, Red Willow | 2 hr |
Nearby
Mesoscale Discussions in Nebraska, 2007Mesoscale Discussions in Colorado, 2007Every mesoscale discussion in 2007
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.