Alert archive / Kansas / Tornado Watches in 2021

Tornado Watch 309

June 24, 20214 states

The Storm Prediction Center issued this tornado watch at Jun 24, 2021, 3:44 PM CDT for 4 states. It was in force for 5 hr.

The area

The outline as issued.

The facts

Issued
Jun 24, 2021, 3:44 PM CDT (20:44 UTC)
Expired
Jun 24, 2021, 9:00 PM CDT
In force
5 hr
Issued by
the Storm Prediction Center
Largest hail expected
3 in
Strongest gust expected
65 kt
All 30 counties

Fremont County, IA, Page County, IA, Atchison County, KS, Brown County, KS, Clay County, KS, Cloud County, KS, Doniphan County, KS, Jackson County, KS, Jewell County, KS, Marshall County, KS, Mitchell County, KS, Nemaha County, KS, Pottawatomie County, KS, Republic County, KS, Riley County, KS, Washington County, KS, Andrew County, MO, Atchison County, MO, Buchanan County, MO, Holt County, MO, Nodaway County, MO, Gage County, NE, Jefferson County, NE, Johnson County, NE, Nemaha County, NE, Nuckolls County, NE, Otoe County, NE, Pawnee County, NE, Richardson County, NE, Thayer County, NE

The radar

The Topeka radar (KTWX), 120 km from the middle of the area, began a volume at 20:46 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
30%
Ten or more severe wind reports
80%
One or more gusts of 65 knots or more
60%
Ten or more severe hail reports
90%
One or more hailstones of 2 inches or more
60%
Six or more combined severe hail and wind reports
95%

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
Jun 24, 4:09 PM CDTSevere Thunderstorm WarningGIDAdams, Clay, Nuckolls, Webster31 min
Jun 24, 5:10 PM CDTSevere Thunderstorm WarningOAXCass, Lancaster, Otoe40 min
Jun 24, 5:29 PM CDTSevere Thunderstorm WarningGIDFillmore, Thayer, York46 min
Jun 24, 5:34 PM CDTSevere Thunderstorm WarningTOPMarshall26 min
Jun 24, 5:34 PM CDTFlash Flood WarningOAXCass, Lancaster, Otoe4 hr
Jun 24, 5:35 PM CDTSevere Thunderstorm WarningOAXGage, Jefferson, Saline, Seward40 min
Jun 24, 5:43 PM CDTTornado WarningOAXOtoe47 min
Jun 24, 5:45 PM CDTTornado WarningTOPMarshall30 min
Jun 24, 6:01 PM CDTSevere Thunderstorm WarningTOPMarshall, Nemaha44 min
Jun 24, 6:07 PM CDTTornado WarningTOPMarshall23 min
Jun 24, 6:07 PM CDTTornado WarningOAXOtoe38 min
Jun 24, 6:12 PM CDTFlash Flood WarningOAXPawnee, Richardson8 hr
Jun 24, 6:12 PM CDTSevere Thunderstorm WarningOAXGage, Lancaster, Saline, Seward48 min
Jun 24, 6:16 PM CDTTornado WarningTOPMarshall, Nemaha29 min
Jun 24, 6:26 PM CDTTornado WarningTOPMarshall, Nemaha34 min
Jun 24, 6:28 PM CDTSevere Thunderstorm WarningOAXRichardson47 min
Jun 24, 6:32 PM CDTFlash Flood WarningEAXAndrew, Atchison, Holt, Nodaway8 hr
Jun 24, 6:34 PM CDTTornado WarningOAXRichardson41 min
Jun 24, 6:36 PM CDTSevere Thunderstorm WarningTOPBrown, Nemaha24 min
Jun 24, 6:43 PM CDTSevere Thunderstorm WarningOAXFremont47 min
Jun 24, 6:46 PM CDTSevere Thunderstorm WarningTOPPottawatomie, Riley29 min
Jun 24, 6:53 PM CDTSevere Thunderstorm WarningEAXAtchison, Holt, Nodaway52 min
Jun 24, 7:00 PM CDTSevere Thunderstorm WarningTOPBrown, Nemaha45 min
Jun 24, 7:03 PM CDTSevere Thunderstorm WarningEAXAtchison42 min
Jun 24, 7:05 PM CDTSevere Thunderstorm WarningOAXPawnee, Richardson21 min
Jun 24, 7:07 PM CDTSevere Thunderstorm WarningTOPPottawatomie23 min
Jun 24, 7:16 PM CDTFlash Flood WarningOAXRichardson8 hr
Jun 24, 7:17 PM CDTSevere Thunderstorm WarningEAXDoniphan43 min
Jun 24, 7:17 PM CDTSevere Thunderstorm WarningTOPMarshall, Nemaha43 min
Jun 24, 7:25 PM CDTSevere Thunderstorm WarningTOPBrown35 min
Jun 24, 7:45 PM CDTSevere Thunderstorm WarningEAXAndrew, DeKalb, Gentry, Nodaway45 min
Jun 24, 7:49 PM CDTSevere Thunderstorm WarningTOPNemaha26 min
Jun 24, 7:55 PM CDTFlash Flood WarningTOPBrown, Nemaha7 hr
Jun 24, 8:04 PM CDTSevere Thunderstorm WarningOAXFremont, Page26 min
Jun 24, 8:07 PM CDTSevere Thunderstorm WarningTOPPottawatomie, Riley23 min
Jun 24, 8:11 PM CDTSevere Thunderstorm WarningTOPBrown, Nemaha49 min
Jun 24, 8:12 PM CDTSevere Thunderstorm WarningEAXAndrew, Daviess, DeKalb, Gentry, Grundy, Harrison and 2 more48 min
Jun 24, 8:27 PM CDTFlash Flood WarningEAXDoniphan16 hr
Jun 24, 8:37 PM CDTSevere Thunderstorm WarningEAXAtchison, Doniphan38 min
Jun 24, 8:41 PM CDTSevere Thunderstorm WarningTOPBrown, Jackson, Nemaha34 min
Jun 24, 8:43 PM CDTSevere Thunderstorm WarningTOPGeary, Pottawatomie, Riley, Wabaunsee32 min
Jun 24, 9:00 PM CDTSevere Thunderstorm WarningEAXAtchison, Leavenworth60 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, 8.7 hours before the alert went out and 149 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 2021-06-24Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2072 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Topeka, KS at 12:00Z on 2021-06-24The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 342 square meters per square second.193958Sfc1 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
2072 J/kg
Mixed-layer CIN
-283 J/kg
Mixed-layer LCL
688 m above ground
0-6 km bulk shear
26 kt
0-1 km storm-relative helicity
342 m²/s²
0-3 km storm-relative helicity
386 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.2

Open this sounding in Storm Lab

The text

As transmitted.

247 
WWUS20 KWNS 242042
SEL9  
SPC WW 242042
IAZ000-KSZ000-MOZ000-NEZ000-250300-

URGENT - IMMEDIATE BROADCAST REQUESTED
Tornado Watch Number 309
NWS Storm Prediction Center Norman OK
345 PM CDT Thu Jun 24 2021

The NWS Storm Prediction Center has issued a

* Tornado Watch for portions of 
  Southwest Iowa
  Northeast Kansas
  Northwest Missouri
  Southeast Nebraska

* Effective this Thursday afternoon and evening from 345 PM until
  1000 PM CDT.

* Primary threats include...
  A few tornadoes and a couple intense tornadoes possible
  Widespread damaging winds and isolated significant gusts to 75
    mph likely
  Widespread large hail and isolated very large hail events to 3
    inches in diameter likely

SUMMARY...Intense thunderstorms are expected to develop along a
boundary over southeast Nebraska. These storms will track
southeastward into northeast Kansas and northwest Missouri during
the late afternoon.  Supercells capable of very large hail, damaging
winds, and a few tornadoes are possible.

The tornado watch area is approximately along and 50 statute miles
north and south of a line from 25 miles west northwest of Concordia
KS to 35 miles east of Falls City NE. For a complete depiction of
the watch see the associated watch outline update (WOUS64 KWNS
WOU9).

PRECAUTIONARY/PREPAREDNESS ACTIONS...

REMEMBER...A Tornado Watch means conditions are favorable for
tornadoes and 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.

&&

AVIATION...Tornadoes and a few severe thunderstorms with hail
surface and aloft to 3 inches. Extreme turbulence and surface wind
gusts to 65 knots. A few cumulonimbi with maximum tops to 600. Mean
storm motion vector 29030.

...Hart

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jun 23, 8:10 PM CDTMesoscale DiscussionSPCMonona, Plymouth, Woodbury95 min
Jun 23, 10:12 PM CDTMesoscale DiscussionSPCHarrison, Mills, Monona, Pottawattamie93 min
Jun 23, 10:37 PM CDTSevere Thunderstorm WatchSPCFremont, Harrison, Mills, Monona, Pottawattamie, Shelby and 1 more6 hr
Jun 24, 1:36 AM CDTMesoscale DiscussionSPCAdams, Cass, Fremont, Harrison, Mills, Montgomery and 4 more114 min
Jun 24, 2:20 AM CDTSevere Thunderstorm WatchSPCAdair, Adams, Audubon, Boone, Carroll, Cass and 15 more6 hr
Jun 24, 5:02 AM CDTMesoscale DiscussionSPCAppanoose, Clarke, Davis, Decatur, Lucas, Madison and 8 more118 min
Jun 24, 5:30 PM CDTMesoscale DiscussionSPCFremont, Page60 min
Jun 24, 6:19 PM CDTMesoscale DiscussionSPCAppanoose, Clarke, Davis, Decatur, Lucas, Monroe and 3 more56 min
Jun 24, 6:33 PM CDTTornado WatchSPCAdams, Appanoose, Clarke, Davis, Decatur, Lucas and 6 more3 hr
Jun 24, 2:45 PM CDTMesoscale DiscussionSPCAtchison, Brown, Douglas, Jackson, Jefferson, Leavenworth and 7 more3 hr
Jun 24, 2:49 PM CDTMesoscale DiscussionSPCCheyenne, Logan, Rawlins, Sherman, Thomas, Wallace116 min
Jun 24, 3:14 PM CDTMesoscale DiscussionSPCGray, Haskell, Meade, Seward91 min
Jun 24, 4:56 PM CDTSevere Thunderstorm WatchSPCCheyenne, Decatur, Finney, Gove, Grant, Gray and 13 more6 hr
Jun 24, 6:31 PM CDTMesoscale DiscussionSPCCheyenne, Greeley, Hamilton, Kearny, Lane, Logan and 6 more119 min

Nearby

Tornado Watches in Kansas, 2021Tornado Watches in Nebraska, 2021Tornado Watches in Missouri, 2021Every tornado 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.