Alert archive / Nebraska / Severe Thunderstorm Watches in 2019
Severe Thunderstorm Watch 608
The Storm Prediction Center issued this severe thunderstorm watch at Aug 20, 2019, 11:02 PM MDT for 22 counties in Nebraska. It was in force for 6 hr.
The area
The outline as issued.
The facts
- Issued
- Aug 20, 2019, 11:02 PM MDT (05:02 UTC)
- Expired
- Aug 21, 2019, 5:00 AM MDT
- In force
- 6 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 1.5 in
- Strongest gust expected
- 65 kt
All 22 counties
Arthur County, NE, Banner County, NE, Blaine County, NE, Box Butte County, NE, Brown County, NE, Cherry County, NE, Cheyenne County, NE, Custer County, NE, Deuel County, NE, Garden County, NE, Grant County, NE, Hooker County, NE, Keith County, NE, Kimball County, NE, Lincoln County, NE, Logan County, NE, Loup County, NE, McPherson County, NE, Morrill County, NE, Perkins County, NE, Sheridan County, NE, Thomas County, NE
The radar
The North Platte radar (KLNX), 111 km from the middle of the area, began a volume at 05:01 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.
What SPC expected
The probabilities SPC published with the watch, for the watch area over its life.
- Two or more tornadoes
- 5%
- One or more EF2 to EF5 tornadoes
- 2%
- Ten or more severe wind reports
- 40%
- One or more gusts of 65 knots or more
- 40%
- Ten or more severe hail reports
- 20%
- One or more hailstones of 2 inches or more
- 20%
- Six or more combined severe hail and wind reports
- 60%
Warnings issued inside it
6 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 20, 11:39 PM MDT | Severe Thunderstorm Warning | CYS | Banner, Box Butte, Cheyenne, Kimball, Morrill | 66 min |
| Aug 20, 11:57 PM MDT | Severe Thunderstorm Warning | LBF | Arthur, Deuel, Garden, Grant, Sheridan | 63 min |
| Aug 21, 12:10 AM MDT | Severe Thunderstorm Warning | LBF | Custer | 65 min |
| Aug 21, 12:32 AM MDT | Severe Thunderstorm Warning | CYS | Box Butte, Cheyenne, Morrill | 28 min |
| Aug 21, 1:05 AM MDT | Flash Flood Warning | LBF | Custer | 5 hr |
| Aug 21, 4:09 AM MDT | Severe Thunderstorm Warning | LBF | Blaine, Brown, Custer, Loup, Rock | 51 min |
Discussions around it
SPC mesoscale discussions over the same counties from four hours before the watch to its end.
The nearest sounding before it
N. Platte/Lee Bi, NE (KLBF), launched 00:00Z, 5.0 hours before the alert went out and 137 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
- 3106 J/kg
- Mixed-layer CIN
- -107 J/kg
- Mixed-layer LCL
- 1409 m above ground
- 0-6 km bulk shear
- 34 kt
- 0-1 km storm-relative helicity
- 25 m²/s²
- 0-3 km storm-relative helicity
- 300 m²/s²
- Significant tornado parameter
- 0.1
- Supercell composite
- 2.1
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 20, 6:00 PM MDT | Mesoscale Discussion | SPC | Banner, Box Butte, Cheyenne, Dawes, Kimball, Morrill and 2 more | 90 min |
| Aug 20, 10:34 PM MDT | Mesoscale Discussion | SPC | Arthur, Banner, Box Butte, Cheyenne, Deuel, Garden and 12 more | 56 min |
| Aug 21, 12:22 AM MDT | Mesoscale Discussion | SPC | Adams, Buffalo, Clay, Fillmore, Gage, Hall and 10 more | 113 min |
| Aug 21, 2:15 AM MDT | Mesoscale Discussion | SPC | Adams, Arthur, Blaine, Buffalo, Custer, Dawson and 14 more | 90 min |
Nearby
Severe Thunderstorm Watches in Nebraska, 2019Every severe thunderstorm watch in 2019
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.