Alert archive / Nebraska / Severe Thunderstorm Watches in 2017
Severe Thunderstorm Watch 491
The Storm Prediction Center issued this severe thunderstorm watch at Oct 1, 2017, 6:32 PM CDT for 24 counties in Nebraska. It was in force for 5 hr.
The area
The outline as issued.
The facts
- Issued
- Oct 1, 2017, 6:32 PM CDT (23:32 UTC)
- Expired
- Oct 1, 2017, 11:57 PM CDT
- In force
- 5 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 2 in
- Strongest gust expected
- 60 kt
All 24 counties
Adams County, NE, Antelope County, NE, Boone County, NE, Clay County, NE, Fillmore County, NE, Garfield County, NE, Greeley County, NE, Hall County, NE, Hamilton County, NE, Holt County, NE, Howard County, NE, Knox County, NE, Loup County, NE, Madison County, NE, Merrick County, NE, Nance County, NE, Nuckolls County, NE, Pierce County, NE, Platte County, NE, Polk County, NE, Thayer County, NE, Webster County, NE, Wheeler County, NE, York County, NE
The radar
The Grand Island radar (KUEX), 132 km from the middle of the area, began a volume at 23:32 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
- 10%
- One or more EF2 to EF5 tornadoes
- 5%
- Ten or more severe wind reports
- 30%
- One or more gusts of 65 knots or more
- 10%
- Ten or more severe hail reports
- 30%
- One or more hailstones of 2 inches or more
- 30%
- Six or more combined severe hail and wind reports
- 60%
Warnings issued inside it
5 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Oct 1, 7:15 PM CDT | Severe Thunderstorm Warning | LBF | Custer, Garfield, Holt, Loup | 45 min |
| Oct 1, 7:43 PM CDT | Flash Flood Warning | LBF | Custer, Loup | 6 hr |
| Oct 1, 8:14 PM CDT | Severe Thunderstorm Warning | LBF | Holt | 46 min |
| Oct 1, 8:37 PM CDT | Severe Thunderstorm Warning | GID | Webster | 38 min |
| Oct 1, 9:15 PM CDT | Severe Thunderstorm Warning | GID | Nuckolls, Webster | 45 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 12:00Z, 11.5 hours before the alert went out and 213 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
- 280 J/kg
- Mixed-layer CIN
- -150 J/kg
- Mixed-layer LCL
- 1058 m above ground
- 0-6 km bulk shear
- 25 kt
- 0-1 km storm-relative helicity
- 4 m²/s²
- 0-3 km storm-relative helicity
- -15 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.8
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Oct 1, 2:39 PM CDT | Mesoscale Discussion | SPC | Chase, Dawson, Dundy, Frontier, Furnas, Gosper and 7 more | 66 min |
| Oct 1, 3:25 PM CDT | Tornado Watch | SPC | Buffalo, Chase, Custer, Dawson, Dundy, Franklin and 16 more | 8 hr |
| Oct 1, 6:40 PM CDT | Mesoscale Discussion | SPC | Adams, Buffalo, Chase, Custer, Dawson, Dundy and 19 more | 2 hr |
Nearby
Severe Thunderstorm Watches in Nebraska, 2017Every severe thunderstorm watch 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.