Alert archive / Kansas / Severe Thunderstorm Watches in 2021
Severe Thunderstorm Watch 546
The Storm Prediction Center issued this severe thunderstorm watch at Nov 10, 2021, 1:55 PM CST for 5 counties in Iowa; 16 counties in Kansas; 13 counties in Missouri. It was in force for 6 hr.
The area
The outline as issued.
The facts
- Issued
- Nov 10, 2021, 1:55 PM CST (19:55 UTC)
- Expired
- Nov 10, 2021, 8:00 PM CST
- In force
- 6 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 1 in
- Strongest gust expected
- 55 kt
All 34 counties
Adams County, IA, Decatur County, IA, Ringgold County, IA, Taylor County, IA, Union County, IA, Atchison County, KS, Brown County, KS, Coffey County, KS, Doniphan County, KS, Douglas County, KS, Franklin County, KS, Jackson County, KS, Jefferson County, KS, Leavenworth County, KS, Lyon County, KS, Morris County, KS, Nemaha County, KS, Osage County, KS, Pottawatomie County, KS, Shawnee County, KS, Wabaunsee County, KS, Andrew County, MO, Atchison County, MO, Buchanan County, MO, Caldwell County, MO, Clinton County, MO, Daviess County, MO, DeKalb County, MO, Gentry County, MO, Harrison County, MO, Holt County, MO, Nodaway County, MO, Platte County, MO, Worth County, MO
The radar
The Topeka radar (KTWX), 74 km from the middle of the area, began a volume at 19:56 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
- 20%
- One or more EF2 to EF5 tornadoes
- 5%
- Ten or more severe wind reports
- 40%
- One or more gusts of 65 knots or more
- 10%
- Ten or more severe hail reports
- 20%
- One or more hailstones of 2 inches or more
- 10%
- Six or more combined severe hail and wind reports
- 70%
Warnings issued inside it
1 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Nov 10, 2:18 PM CST | Severe Thunderstorm Warning | EAX | Doniphan | 27 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, 7.9 hours before the alert went out and 37 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
- 24 J/kg
- Mixed-layer CIN
- -36 J/kg
- Mixed-layer LCL
- 634 m above ground
- 0-6 km bulk shear
- 42 kt
- 0-1 km storm-relative helicity
- 136 m²/s²
- 0-3 km storm-relative helicity
- 154 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
222 WWUS20 KWNS 101953 SEL6 SPC WW 101953 IAZ000-KSZ000-MOZ000-110200- URGENT - IMMEDIATE BROADCAST REQUESTED Severe Thunderstorm Watch Number 546 NWS Storm Prediction Center Norman OK 155 PM CST Wed Nov 10 2021 The NWS Storm Prediction Center has issued a * Severe Thunderstorm Watch for portions of Southern Iowa East-central/Northeast Kansas Northwest Missouri * Effective this Wednesday afternoon and evening from 155 PM until 800 PM CST. * Primary threats include... Scattered damaging wind gusts to 65 mph possible Isolated large hail events to 1 inch in diameter possible A tornado or two possible SUMMARY...Clusters of storms will continue to move northeastward across the region as the air mass continues to modestly destabilize through the afternoon, with periodic severe storms a possibility through late afternoon/early evening. The severe thunderstorm watch area is approximately along and 50 statute miles east and west of a line from 15 miles east southeast of Emporia KS to 30 miles northwest of Lamoni IA. For a complete depiction of the watch see the associated watch outline update (WOUS64 KWNS WOU6). PRECAUTIONARY/PREPAREDNESS ACTIONS... REMEMBER...A Severe Thunderstorm Watch means conditions are favorable for severe thunderstorms in and close to the watch area. Persons in these areas should be on the lookout for threatening weather conditions and listen for later statements and possible warnings. Severe thunderstorms can and occasionally do produce tornadoes. && AVIATION...A few severe thunderstorms with hail surface and aloft to 1 inch. Extreme turbulence and surface wind gusts to 55 knots. A few cumulonimbi with maximum tops to 500. Mean storm motion vector 21035. ...Guyer
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Nov 10, 3:46 PM CST | Mesoscale Discussion | SPC | Boone, Clarke, Dallas, Decatur, Jasper, Lucas and 8 more | 119 min |
| Nov 10, 10:53 AM CST | Mesoscale Discussion | SPC | Atchison, Brown, Chase, Clay, Dickinson, Geary and 10 more | 2 hr |
| Nov 10, 3:26 PM CST | Severe Thunderstorm Watch | SPC | Chautauqua, Elk, Greenwood, Montgomery, Wilson, Woodson | 7 hr |
| Nov 10, 5:29 PM CST | Mesoscale Discussion | SPC | Anderson, Atchison, Coffey, Douglas, Franklin, Jefferson and 8 more | 2 hr |
Nearby
Severe Thunderstorm Watches in Kansas, 2021Severe Thunderstorm Watches in Missouri, 2021Severe Thunderstorm Watches in Iowa, 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.