Alert archive / Missouri / Severe Thunderstorm Watches in 2021
Severe Thunderstorm Watch 530
The Storm Prediction Center issued this severe thunderstorm watch at Oct 23, 2021, 9:53 PM CDT for 4 states. It was in force for 7 hr.
The area
The outline as issued.
The facts
- Issued
- Oct 23, 2021, 9:53 PM CDT (02:53 UTC)
- Expired
- Oct 24, 2021, 5:00 AM CDT
- In force
- 7 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 1.5 in
- Strongest gust expected
- 50 kt
All 58 counties
Adams County, IA, Appanoose County, IA, Clarke County, IA, Davis County, IA, Decatur County, IA, Fremont County, IA, Mills County, IA, Montgomery County, IA, Page County, IA, Ringgold County, IA, Taylor County, IA, Union County, IA, Wayne County, IA, Atchison County, KS, Brown County, KS, Doniphan County, KS, Jackson County, KS, Marshall County, KS, Nemaha County, KS, Adair County, MO, Andrew County, MO, Atchison County, MO, Buchanan County, MO, Caldwell County, MO, Carroll County, MO, Chariton County, MO, Clay County, MO, Clinton County, MO, Daviess County, MO, DeKalb County, MO, Gentry County, MO, Grundy County, MO, Harrison County, MO, Holt County, MO, Howard County, MO, Lafayette County, MO, Linn County, MO, Livingston County, MO, Macon County, MO, Mercer County, MO, Nodaway County, MO, Platte County, MO, Putnam County, MO, Randolph County, MO, Ray County, MO, Saline County, MO, Schuyler County, MO, Sullivan County, MO, Worth County, MO, Cass County, NE, Gage County, NE, Johnson County, NE, Lancaster County, NE, Nemaha County, NE, Otoe County, NE, Pawnee County, NE, Richardson County, NE, Sarpy County, NE
The radar
The Omaha radar (KOAX), 160 km from the middle of the area, began a volume at 02:55 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
- 5%
- One or more gusts of 65 knots or more
- 5%
- Ten or more severe hail reports
- 60%
- One or more hailstones of 2 inches or more
- 10%
- Six or more combined severe hail and wind reports
- 80%
Warnings issued inside it
2 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Oct 24, 12:37 AM CDT | Severe Thunderstorm Warning | TOP | Jackson | 38 min |
| Oct 24, 1:04 AM CDT | Severe Thunderstorm Warning | EAX | Atchison | 26 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 00:00Z, 2.9 hours before the alert went out and 161 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 616 m above ground
- 0-6 km bulk shear
- 51 kt
- 0-1 km storm-relative helicity
- 339 m²/s²
- 0-3 km storm-relative helicity
- 493 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.2
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Oct 23, 9:14 PM CDT | Mesoscale Discussion | SPC | Appanoose, Davis, Decatur, Fremont, Lee, Page and 4 more | 3 hr |
| Oct 24, 2:13 AM CDT | Mesoscale Discussion | SPC | Andrew, Audrain, Boone, Buchanan, Caldwell, Callaway and 24 more | 2 hr |
| Oct 24, 12:40 PM CDT | Mesoscale Discussion | SPC | Audrain, Barry, Barton, Benton, Boone, Callaway and 60 more | 3 hr |
| Oct 24, 2:06 PM CDT | Tornado Watch | SPC | Adair, Andrew, Audrain, Barry, Barton, Bates and 83 more | 9 hr |
| Oct 24, 3:28 PM CDT | Mesoscale Discussion | SPC | Bates, Caldwell, Carroll, Cass, Daviess, Grundy and 10 more | 92 min |
| Oct 24, 3:50 PM CDT | Mesoscale Discussion | SPC | Audrain, Callaway, Cole, Franklin, Gasconade, Lincoln and 8 more | 85 min |
| Oct 24, 5:11 PM CDT | Mesoscale Discussion | SPC | Saint Louis, City of Saint Louis | 3 hr |
| Oct 24, 5:25 PM CDT | Mesoscale Discussion | SPC | Adair, Audrain, Benton, Boone, Callaway, Camden and 41 more | 2 hr |
| Oct 24, 5:44 PM CDT | Tornado Watch | SPC | Bollinger, Butler, Cape Girardeau, Carter, Madison, Mississippi and 8 more | 7 hr |
Nearby
Severe Thunderstorm Watches in Missouri, 2021Severe Thunderstorm Watches in Iowa, 2021Severe Thunderstorm Watches in Nebraska, 2021Every severe thunderstorm watch in 2021
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.