Alert archive / Nebraska / Mesoscale Discussions in 2017
Mesoscale Discussion 1488
The Storm Prediction Center issued this mesoscale discussion at Aug 13, 2017, 3:18 PM CDT for 28 counties in Nebraska; 4 counties in South Dakota. It was in force for 117 min.
The area
The outline as issued.
The facts
- Issued
- Aug 13, 2017, 3:18 PM CDT (20:18 UTC)
- Expired
- Aug 13, 2017, 5:15 PM CDT
- In force
- 117 min
- Issued by
- the Storm Prediction Center
- Chance of a watch
- 80%
All 32 counties
Blaine County, NE, Boyd County, NE, Brown County, NE, Buffalo County, NE, Custer County, NE, Dawson County, NE, Frontier County, NE, Furnas County, NE, Garfield County, NE, Gosper County, NE, Harlan County, NE, Hayes County, NE, Hitchcock 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, Phelps County, NE, Red Willow County, NE, Rock County, NE, Sherman County, NE, Thomas County, NE, Valley County, NE, Aurora County, SD, Charles Mix County, SD, Douglas County, SD, Gregory County, SD
The radar
The North Platte radar (KLNX), 75 km from the middle of the area, began a volume at 20:19 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
N. Platte/Lee Bi, NE (KLBF), launched 12:00Z, 8.3 hours before the alert went out and 99 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
- 439 J/kg
- Mixed-layer CIN
- -191 J/kg
- Mixed-layer LCL
- 890 m above ground
- 0-6 km bulk shear
- 39 kt
- 0-1 km storm-relative helicity
- 83 m²/s²
- 0-3 km storm-relative helicity
- 96 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.4
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 |
|---|---|---|---|---|
| Aug 12, 8:41 PM CDT | Mesoscale Discussion | SPC | Buffalo, Custer, Dawson, Frontier, Furnas, Gosper and 4 more | 94 min |
| Aug 13, 4:00 PM CDT | Severe Thunderstorm Watch | SPC | Antelope, Blaine, Boone, Boyd, Brown, Buffalo and 35 more | 11 hr |
Nearby
Mesoscale Discussions in Nebraska, 2017Mesoscale Discussions in South Dakota, 2017Every mesoscale discussion in 2017
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.