Alert archive / Nebraska / Mesoscale Discussions in 2020
Mesoscale Discussion 1127
The Storm Prediction Center issued this mesoscale discussion at Jul 7, 2020, 12:44 AM CDT for 13 counties in Nebraska; 9 counties in South Dakota. It was in force for 2 hr.
The area
The outline as issued.
The facts
- Issued
- Jul 7, 2020, 12:44 AM CDT (05:44 UTC)
- Expired
- Jul 7, 2020, 2:45 AM CDT
- In force
- 2 hr
- Issued by
- the Storm Prediction Center
- Concerning
- Severe thunderstorm watch 336
All 22 counties
Antelope County, NE, Boone County, NE, Boyd County, NE, Brown County, NE, Cedar County, NE, Holt County, NE, Keya Paha County, NE, Knox County, NE, Madison County, NE, Pierce County, NE, Rock County, NE, Wayne County, NE, Wheeler County, NE, Aurora County, SD, Bon Homme County, SD, Brule County, SD, Charles Mix County, SD, Douglas County, SD, Gregory County, SD, Lyman County, SD, Todd County, SD, Tripp County, SD
The radar
The North Platte radar (KLNX), 160 km from the middle of the area, began a volume at 05:45 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 00:00Z, 5.7 hours before the alert went out and 226 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
- 450 J/kg
- Mixed-layer CIN
- -162 J/kg
- Mixed-layer LCL
- 2603 m above ground
- 0-6 km bulk shear
- 27 kt
- 0-1 km storm-relative helicity
- -10 m²/s²
- 0-3 km storm-relative helicity
- 111 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- -0.1
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 |
|---|---|---|---|---|
| Jul 6, 8:22 PM CDT | Mesoscale Discussion | SPC | Boone, Burt, Colfax, Dodge, Madison, Platte | 53 min |
| Jul 7, 1:02 AM CDT | Severe Thunderstorm Watch | SPC | Antelope, Boyd, Brown, Cedar, Cuming, Dakota and 12 more | 4 hr |
| Jul 7, 3:24 AM CDT | Mesoscale Discussion | SPC | Burt, Cedar, Colfax, Cuming, Dakota, Dixon and 8 more | 2 hr |
| Jul 7, 3:50 PM CDT | Mesoscale Discussion | SPC | Box Butte, Dawes, Morrill, Scotts Bluff, Sioux | 85 min |
| Jul 6, 9:07 PM CDT | Mesoscale Discussion | SPC | Bennett, Buffalo, Haakon, Hand, Hughes, Hyde and 9 more | 83 min |
| Jul 6, 10:47 PM CDT | Severe Thunderstorm Watch | SPC | Aurora, Bennett, Bon Homme, Brule, Buffalo, Charles Mix and 18 more | 4 hr |
Nearby
Mesoscale Discussions in Nebraska, 2020Mesoscale Discussions in South Dakota, 2020Every mesoscale discussion in 2020
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.