Alert archive / Nebraska / Tornado Watches in 2023
Tornado Watch 688
The Storm Prediction Center issued this tornado watch at Sep 21, 2023, 4:49 PM CDT for 4 counties in Kansas; 8 counties in Nebraska. It was in force for 7 hr.
The area
The outline as issued.
The facts
- Issued
- Sep 21, 2023, 4:49 PM CDT (21:49 UTC)
- Expired
- Sep 21, 2023, 11:58 PM CDT
- In force
- 7 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 2.5 in
- Strongest gust expected
- 60 kt
Counties Jewell County, KS, Mitchell County, KS, Osborne County, KS, Smith County, KS, Adams County, NE, Buffalo County, NE, Clay County, NE, Franklin County, NE, Hall County, NE, Kearney County, NE, Nuckolls County, NE, Webster County, NE
The radar
The Grand Island radar (KUEX), 17 km from the middle of the area, began a volume at 21:53 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
- 40%
- One or more EF2 to EF5 tornadoes
- 20%
- Ten or more severe wind reports
- 40%
- One or more gusts of 65 knots or more
- 20%
- Ten or more severe hail reports
- 40%
- One or more hailstones of 2 inches or more
- 40%
- Six or more combined severe hail and wind reports
- 70%
Warnings issued inside it
9 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 21, 4:58 PM CDT | Severe Thunderstorm Warning | GID | Nuckolls, Webster | 47 min |
| Sep 21, 5:01 PM CDT | Severe Thunderstorm Warning | GID | Buffalo, Dawson | 22 min |
| Sep 21, 5:47 PM CDT | Severe Thunderstorm Warning | GID | Webster | 43 min |
| Sep 21, 6:29 PM CDT | Severe Thunderstorm Warning | GID | Adams, Webster | 22 min |
| Sep 21, 9:43 PM CDT | Severe Thunderstorm Warning | GID | Franklin, Furnas, Harlan | 47 min |
| Sep 21, 9:50 PM CDT | Tornado Warning | GID | Franklin, Harlan | 25 min |
| Sep 21, 10:14 PM CDT | Severe Thunderstorm Warning | GID | Phillips, Smith | 61 min |
| Sep 21, 10:42 PM CDT | Flash Flood Warning | GID | Buffalo | 5 hr |
| Sep 21, 11:32 PM CDT | Flash Flood Warning | GID | Phillips, Smith | 5 hr |
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, 9.8 hours before the alert went out and 186 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
- 912 J/kg
- Mixed-layer CIN
- -259 J/kg
- Mixed-layer LCL
- 1393 m above ground
- 0-6 km bulk shear
- 26 kt
- 0-1 km storm-relative helicity
- 119 m²/s²
- 0-3 km storm-relative helicity
- 41 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 21, 2:08 PM CDT | Mesoscale Discussion | SPC | Decatur, Gove, Graham, Logan, Norton, Phillips and 7 more | 2 hr |
| Sep 21, 2:51 PM CDT | Tornado Watch | SPC | Decatur, Gove, Graham, Logan, Norton, Phillips and 4 more | 9 hr |
| Sep 21, 3:41 PM CDT | Mesoscale Discussion | SPC | Clay, Cloud, Jewell, Marshall, Mitchell, Ottawa and 3 more | 2 hr |
| Sep 21, 4:43 PM CDT | Mesoscale Discussion | SPC | Morton, Stevens | 2 hr |
| Sep 21, 5:18 PM CDT | Mesoscale Discussion | SPC | Allen, Anderson, Bourbon, Chase, Cherokee, Coffey and 13 more | 117 min |
Nearby
Tornado Watches in Nebraska, 2023Tornado Watches in Kansas, 2023Every tornado watch in 2023
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.