Alert archive / Kansas / Severe Thunderstorm Watches in 2020

Severe Thunderstorm Watch 101

April 11, 202031 counties in Kansas; 16 counties in Missouri

The Storm Prediction Center issued this severe thunderstorm watch at Apr 11, 2020, 5:35 PM CDT for 31 counties in Kansas; 16 counties in Missouri. It was in force for 7 hr.

The area

The outline as issued.

The facts

Issued
Apr 11, 2020, 5:35 PM CDT (22:35 UTC)
Expired
Apr 12, 2020, 12:54 AM CDT
In force
7 hr
Issued by
the Storm Prediction Center
Largest hail expected
2 in
Strongest gust expected
60 kt
All 47 counties

Anderson County, KS, Atchison County, KS, Butler County, KS, Chase County, KS, Coffey County, KS, Dickinson County, KS, Doniphan County, KS, Douglas County, KS, Franklin County, KS, Geary County, KS, Greenwood County, KS, Harvey County, KS, Jackson County, KS, Jefferson County, KS, Johnson County, KS, Kingman County, KS, Leavenworth County, KS, Lyon County, KS, Marion County, KS, McPherson County, KS, Miami County, KS, Morris County, KS, Osage County, KS, Pottawatomie County, KS, Reno County, KS, Riley County, KS, Saline County, KS, Sedgwick County, KS, Shawnee County, KS, Wabaunsee County, KS, Wyandotte County, KS, Andrew County, MO, Buchanan County, MO, Caldwell County, MO, Cass County, MO, Clay County, MO, Clinton County, MO, Daviess County, MO, DeKalb County, MO, Gentry County, MO, Harrison County, MO, Holt County, MO, Jackson County, MO, Nodaway County, MO, Platte County, MO, Ray County, MO, Worth County, MO

The radar

The Topeka radar (KTWX), 31 km from the middle of the area, began a volume at 22:37 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
20%
One or more gusts of 65 knots or more
10%
Ten or more severe hail reports
40%
One or more hailstones of 2 inches or more
30%
Six or more combined severe hail and wind reports
70%

Warnings issued inside it

28 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.

IssuedProductOfficeCountiesLasted
Apr 11, 5:55 PM CDTSevere Thunderstorm WarningICTChase, Marion65 min
Apr 11, 6:25 PM CDTSevere Thunderstorm WarningTOPMorris35 min
Apr 11, 6:49 PM CDTSevere Thunderstorm WarningTOPLyon, Morris26 min
Apr 11, 6:54 PM CDTSevere Thunderstorm WarningICTButler, Chase, Marion66 min
Apr 11, 7:03 PM CDTSevere Thunderstorm WarningTOPWabaunsee57 min
Apr 11, 7:35 PM CDTSevere Thunderstorm WarningTOPLyon, Osage, Shawnee, Wabaunsee55 min
Apr 11, 7:40 PM CDTSevere Thunderstorm WarningTOPJackson, Shawnee, Wabaunsee50 min
Apr 11, 7:56 PM CDTSevere Thunderstorm WarningTOPDouglas, Jefferson, Shawnee49 min
Apr 11, 8:04 PM CDTSevere Thunderstorm WarningTOPJackson, Jefferson26 min
Apr 11, 8:09 PM CDTSevere Thunderstorm WarningTOPOsage, Shawnee, Wabaunsee36 min
Apr 11, 8:09 PM CDTSevere Thunderstorm WarningEAXClay, Platte36 min
Apr 11, 8:11 PM CDTSevere Thunderstorm WarningEAXAtchison49 min
Apr 11, 8:27 PM CDTSevere Thunderstorm WarningTOPJackson, Shawnee, Wabaunsee33 min
Apr 11, 8:44 PM CDTSevere Thunderstorm WarningEAXAtchison, Doniphan46 min
Apr 11, 8:54 PM CDTSevere Thunderstorm WarningEAXBuchanan, Clinton, DeKalb36 min
Apr 11, 9:07 PM CDTSevere Thunderstorm WarningEAXAndrew, Buchanan, DeKalb38 min
Apr 11, 9:14 PM CDTSevere Thunderstorm WarningEAXDoniphan31 min
Apr 11, 9:40 PM CDTSevere Thunderstorm WarningTOPJackson50 min
Apr 11, 9:40 PM CDTSevere Thunderstorm WarningEAXDaviess, DeKalb, Harrison35 min
Apr 11, 9:52 PM CDTSevere Thunderstorm WarningEAXHarrison, Worth38 min
Apr 11, 10:16 PM CDTSevere Thunderstorm WarningTOPBrown, Jackson, Marshall, Nemaha, Pottawatomie, Riley44 min
Apr 11, 10:17 PM CDTSevere Thunderstorm WarningEAXAtchison43 min
Apr 11, 10:57 PM CDTSevere Thunderstorm WarningTOPJackson, Marshall, Nemaha, Pottawatomie, Riley48 min
Apr 11, 11:20 PM CDTSevere Thunderstorm WarningTOPJackson, Jefferson40 min
Apr 11, 11:22 PM CDTSevere Thunderstorm WarningTOPPottawatomie38 min
Apr 11, 11:26 PM CDTFlash Flood WarningTOPJackson4 hr
Apr 11, 11:39 PM CDTFlash Flood WarningTOPPottawatomie4 hr
Apr 11, 11:58 PM CDTSevere Thunderstorm WarningTOPPottawatomie47 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, 10.6 hours before the alert went out and 70 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.

Skew-T log-pSkew-T log-p diagram, Topeka, KS at 12:00Z on 2020-04-11Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Topeka, KS at 12:00Z on 2020-04-11The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 343 square meters per square second.1939587897Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1850 m above ground
0-6 km bulk shear
32 kt
0-1 km storm-relative helicity
343 m²/s²
0-3 km storm-relative helicity
408 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Apr 11, 3:43 PM CDTMesoscale DiscussionSPCAnderson, Butler, Chase, Chautauqua, Coffey, Cowley and 15 more2 hr

Nearby

Severe Thunderstorm Watches in Kansas, 2020Severe Thunderstorm Watches in Missouri, 2020Every severe thunderstorm watch in 2020

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.