Alert archive / Nebraska / Tornado Watches in 2024
Tornado Watch 276
The Storm Prediction Center issued this tornado watch at May 21, 2024, 11:10 AM CDT for 4 states. It was in force for 5 hr.
The area
The outline as issued.
The facts
- Issued
- May 21, 2024, 11:10 AM CDT (16:10 UTC)
- Expired
- May 21, 2024, 3:58 PM CDT
- In force
- 5 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 3 in
- Strongest gust expected
- 60 kt
All 48 counties
Buena Vista County, IA, Cherokee County, IA, Clay County, IA, Dickinson County, IA, Fremont County, IA, Harrison County, IA, Ida County, IA, Lyon County, IA, Mills County, IA, Monona County, IA, Montgomery County, IA, O'Brien County, IA, Osceola County, IA, Page County, IA, Plymouth County, IA, Pottawattamie County, IA, Shelby County, IA, Sioux County, IA, Woodbury County, IA, Atchison County, MO, Burt County, NE, Butler County, NE, Cass County, NE, Cedar County, NE, Colfax County, NE, Cuming County, NE, Dakota County, NE, Dixon County, NE, Dodge County, NE, Douglas County, NE, Gage County, NE, Johnson County, NE, Lancaster County, NE, Nemaha County, NE, Otoe County, NE, Pawnee County, NE, Richardson County, NE, Saline County, NE, Sarpy County, NE, Saunders County, NE, Seward County, NE, Stanton County, NE, Thurston County, NE, Washington County, NE, Wayne County, NE, Clay County, SD, Lincoln County, SD, Union County, SD
The radar
The Omaha radar (KOAX), 95 km from the middle of the area, began a volume at 16:09 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
- 50%
- One or more EF2 to EF5 tornadoes
- 40%
- Ten or more severe wind reports
- 60%
- One or more gusts of 65 knots or more
- 20%
- Ten or more severe hail reports
- 60%
- One or more hailstones of 2 inches or more
- 40%
- Six or more combined severe hail and wind reports
- 95%
Warnings issued inside it
24 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 21, 11:20 AM CDT | Severe Thunderstorm Warning | OAX | Butler, Lancaster, Seward | 40 min |
| May 21, 11:48 AM CDT | Severe Thunderstorm Warning | OAX | Butler, Lancaster, Saunders, Seward | 42 min |
| May 21, 12:16 PM CDT | Severe Thunderstorm Warning | OAX | Harrison | 44 min |
| May 21, 12:38 PM CDT | Severe Thunderstorm Warning | OAX | Dodge, Douglas, Saunders, Washington | 52 min |
| May 21, 12:44 PM CDT | Tornado Warning | OAX | Douglas, Saunders | 31 min |
| May 21, 12:45 PM CDT | Severe Thunderstorm Warning | OAX | Gage, Johnson, Otoe | 45 min |
| May 21, 12:50 PM CDT | Tornado Warning | OAX | Harrison | 19 min |
| May 21, 12:59 PM CDT | Severe Thunderstorm Warning | OAX | Harrison, Monona | 61 min |
| May 21, 1:01 PM CDT | Severe Thunderstorm Warning | OAX | Cass, Douglas, Sarpy | 59 min |
| May 21, 1:15 PM CDT | Tornado Warning | OAX | Fremont | 45 min |
| May 21, 1:16 PM CDT | Severe Thunderstorm Warning | OAX | Harrison, Pottawattamie, Shelby | 59 min |
| May 21, 1:27 PM CDT | Severe Thunderstorm Warning | FSD | Woodbury | 33 min |
| May 21, 1:34 PM CDT | Severe Thunderstorm Warning | OAX | Mills, Pottawattamie | 26 min |
| May 21, 1:38 PM CDT | Severe Thunderstorm Warning | OAX | Pottawattamie | 37 min |
| May 21, 1:43 PM CDT | Tornado Warning | OAX | Fremont, Mills | 47 min |
| May 21, 1:47 PM CDT | Severe Thunderstorm Warning | OAX | Fremont, Montgomery, Page | 43 min |
| May 21, 1:48 PM CDT | Severe Thunderstorm Warning | FSD | Cherokee, Ida, Woodbury | 27 min |
| May 21, 1:59 PM CDT | Severe Thunderstorm Warning | OAX | Harrison, Monona | 12 min |
| May 21, 2:10 PM CDT | Severe Thunderstorm Warning | OAX | Mills, Montgomery, Pottawattamie, Shelby | 50 min |
| May 21, 2:11 PM CDT | Severe Thunderstorm Warning | FSD | Buena Vista, Cherokee, Ida | 34 min |
| May 21, 2:11 PM CDT | Severe Thunderstorm Warning | OAX | Harrison, Pottawattamie, Shelby | 49 min |
| May 21, 2:15 PM CDT | Tornado Warning | OAX | Fremont, Mills, Montgomery, Page | 45 min |
| May 21, 2:38 PM CDT | Tornado Warning | OAX | Montgomery, Page | 30 min |
| May 21, 2:42 PM CDT | Severe Thunderstorm Warning | FSD | Buena Vista, Cherokee, Clay, O'Brien | 19 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
Topeka, KS (KTOP), launched 12:00Z, 4.2 hours before the alert went out and 345 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
- 1197 J/kg
- Mixed-layer CIN
- -325 J/kg
- Mixed-layer LCL
- 744 m above ground
- 0-6 km bulk shear
- 48 kt
- 0-1 km storm-relative helicity
- 562 m²/s²
- 0-3 km storm-relative helicity
- 663 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- -0.4
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 20, 9:23 PM CDT | Mesoscale Discussion | SPC | Buena Vista, Calhoun, Cerro Gordo, Cherokee, Clay, Dickinson and 20 more | 97 min |
| May 20, 10:01 PM CDT | Mesoscale Discussion | SPC | Audubon, Cass, Harrison, Mills, Montgomery, Pottawattamie and 1 more | 119 min |
| May 20, 11:33 PM CDT | Severe Thunderstorm Watch | SPC | Fremont, Harrison, Mills, Monona, Montgomery, Page and 2 more | 9 hr |
| May 20, 11:34 PM CDT | Mesoscale Discussion | SPC | Buena Vista, Calhoun, Cerro Gordo, Cherokee, Chickasaw, Clay and 18 more | 86 min |
| May 21, 2:04 AM CDT | Mesoscale Discussion | SPC | Crawford, Harrison, Mills, Monona, Pottawattamie, Shelby and 1 more | 116 min |
| May 21, 5:51 AM CDT | Mesoscale Discussion | SPC | Adair, Adams, Appanoose, Audubon, Benton, Cass and 32 more | 114 min |
| May 21, 6:15 AM CDT | Severe Thunderstorm Watch | SPC | Adair, Adams, Appanoose, Audubon, Benton, Black Hawk and 45 more | 7 hr |
| May 21, 9:29 AM CDT | Mesoscale Discussion | SPC | Benton, Cedar, Clinton, Delaware, Dubuque, Henry and 23 more | 91 min |
| May 21, 10:27 AM CDT | Mesoscale Discussion | SPC | Cherokee, Crawford, Fremont, Harrison, Ida, Mills and 5 more | 2 hr |
| May 21, 12:32 PM CDT | Mesoscale Discussion | SPC | Adair, Adams, Allamakee, Appanoose, Audubon, Benton and 70 more | 118 min |
| May 21, 1:14 PM CDT | Tornado Watch | SPC | Adair, Adams, Allamakee, Appanoose, Audubon, Benton and 74 more | 8 hr |
| May 21, 3:20 PM CDT | Mesoscale Discussion | SPC | Adair, Adams, Clarke, Dallas, Madison, Marion and 3 more | 85 min |
| May 21, 5:03 PM CDT | Mesoscale Discussion | SPC | Appanoose, Benton, Black Hawk, Bremer, Buchanan, Butler and 29 more | 87 min |
| May 21, 5:09 PM CDT | Mesoscale Discussion | SPC | Allamakee, Benton, Black Hawk, Bremer, Buchanan, Butler and 11 more | 96 min |
| May 21, 2:15 PM CDT | Mesoscale Discussion | SPC | Andrew, Barry, Barton, Bates, Benton, Buchanan and 28 more | 2 hr |
| May 21, 2:40 PM CDT | Tornado Watch | SPC | Adair, Andrew, Barry, Barton, Bates, Benton and 51 more | 7 hr |
| May 21, 3:54 PM CDT | Mesoscale Discussion | SPC | Adair, Audrain, Boone, Chariton, Clark, Howard and 12 more | 2 hr |
| May 21, 5:33 PM CDT | Mesoscale Discussion | SPC | Audrain, Barry, Benton, Boone, Callaway, Camden and 37 more | 117 min |
| May 21, 5:56 PM CDT | Tornado Watch | SPC | Audrain, Boone, Callaway, Clark, Cole, Crawford and 35 more | 6 hr |
| May 20, 8:25 PM CDT | Mesoscale Discussion | SPC | Chase, Dundy, Frontier, Furnas, Gosper, Hayes and 3 more | 95 min |
| May 20, 9:01 PM CDT | Tornado Watch | SPC | Arthur, Chase, Deuel, Dundy, Frontier, Garden and 8 more | 6 hr |
| May 20, 10:59 PM CDT | Mesoscale Discussion | SPC | Chase, Dundy, Hayes, Hitchcock, Red Willow | 2 hr |
| May 21, 1:29 AM CDT | Mesoscale Discussion | SPC | Dundy, Frontier, Hitchcock, Red Willow | 61 min |
| May 21, 4:08 AM CDT | Mesoscale Discussion | SPC | Adams, Burt, Butler, Cass, Clay, Colfax and 20 more | 2 hr |
Nearby
Tornado Watches in Nebraska, 2024Tornado Watches in Iowa, 2024Tornado Watches in South Dakota, 2024Every tornado watch in 2024
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.