Alert archive / Kansas / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 29, NWS Kansas City, MO

June 11, 2021Johnson County, Miami County, Wyandotte County, Kansas; Cass County, Clay County, Jackson County, Missouri

NWS Kansas City, MO issued this severe thunderstorm warning at Jun 11, 2021, 3:59 PM CDT for Johnson County, Miami County, Wyandotte County, Kansas; Cass County, Clay County, Jackson County, Missouri. It was in force for 31 min. 4 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Jun 11, 2021, 3:59 PM CDT (20:59 UTC)
Expired: Jun 11, 2021, 4:30 PM CDT
In force: 31 min
Issued by: NWS Kansas City, MO
Area: Storm-based polygon
Hail: 1.25 in
Wind: 60.0 mph

Counties Johnson County, KS, Miami County, KS, Wyandotte County, KS, Cass County, MO, Clay County, MO, Jackson County, MO

The radar

The Pleasant Hill radar (KEAX), 33 km from the middle of the area, began a volume at 21:02 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 was reported inside it

Time	Report	Where	Remark
Jun 11, 4:00 PM CDT	HAIL 1	4 Sw Leawood, KS	SEVERAL REPORTS OF QUARTER SIZED-HAIL. PICTURES ON TWITTER SHOWS HAIL APPROPRIATELY MEASURED.
Jun 11, 4:02 PM CDT	HAIL 1	Overland Park, KS	DELAYED REPORT.
Jun 11, 4:02 PM CDT	HAIL 1.5	Leawood, KS
Jun 11, 4:10 PM CDT	TSTM WND GST 60	2 W Raymore, MO

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Jun 11, 12:32 PM CDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Topeka, KS (KTOP), launched 12:00Z, 9.0 hours before the alert went out and 88 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 2135 J/kg
Mixed-layer CIN: -160 J/kg
Mixed-layer LCL: 1019 m above ground
0-6 km bulk shear: 23 kt
0-1 km storm-relative helicity: 3 m²/s²
0-3 km storm-relative helicity: 72 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -1.2

Open this sounding in Storm Lab

The text

As transmitted.

502 
WUUS53 KEAX 112059
SVREAX
KSC091-121-209-MOC037-047-095-112130-
/O.NEW.KEAX.SV.W.0029.210611T2059Z-210611T2130Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Kansas City/Pleasant Hill MO
359 PM CDT Fri Jun 11 2021

The National Weather Service in Pleasant Hill has issued a

* Severe Thunderstorm Warning for...
  Southeastern Wyandotte County in northeastern Kansas...
  Northeastern Miami County in east central Kansas...
  Johnson County in east central Kansas...
  Northwestern Cass County in west central Missouri...
  Southwestern Clay County in west central Missouri...
  Western Jackson County in west central Missouri...

* Until 430 PM CDT.

* At 359 PM CDT, a severe thunderstorm was located near Leawood,
  moving southeast at 30 mph.

  HAZARD...60 mph wind gusts and half dollar size hail.

  SOURCE...Radar indicated.

  IMPACT...Hail damage to vehicles is expected. Expect wind damage 
           to roofs, siding, and trees.

* This severe thunderstorm will be near...
  Belton around 405 PM CDT.
  Raymore around 410 PM CDT.

Other locations in the path of this severe thunderstorm include Lake
Winnebago, Peculiar and Lake Annette.

This includes the following highways...
 Interstate 70 in Missouri between mile markers 0 and 10.
 Interstate 70 in Kansas between mile markers 416 and 423.
 Interstate 35 in Missouri between mile markers 0 and 7.
 Interstate 35 in Kansas between mile markers 211 and 235.
 Interstate 635 between mile markers 0 and 8.
 Interstate 470 between mile markers 0 and 4.
 Interstate 435 between mile markers 0 and 8, and between mile
markers 55 and 83.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 3894 9489 3915 9470 3917 9442 3889 9447
      3883 9436 3858 9449 3862 9487
TIME...MOT...LOC 2059Z 318DEG 24KT 3887 9459 

HAIL...1.25IN
WIND...60MPH
 
$$

PP

2 follow-up statements

292 
WWUS53 KEAX 112116
SVSEAX

Severe Weather Statement
National Weather Service Kansas City/Pleasant Hill MO
416 PM CDT Fri Jun 11 2021

KSC121-MOC047-112126-
/O.CAN.KEAX.SV.W.0029.000000T0000Z-210611T2130Z/
Miami KS-Clay MO-
416 PM CDT Fri Jun 11 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN MIAMI AND
SOUTHWESTERN CLAY COUNTIES IS CANCELLED...
    
The severe thunderstorm which prompted the warning has moved out of 
the warned area. Therefore, the warning has been cancelled.

A Severe Thunderstorm Watch remains in effect until 700 PM CDT for
northeastern and east central Kansas...and west central Missouri.

LAT...LON 3868 9461 3873 9461 3874 9466 3893 9480
      3908 9472 3907 9444 3889 9447 3882 9446
      3858 9451 3858 9452
TIME...MOT...LOC 2116Z 318DEG 24KT 3878 9449 

$$

KSC091-209-MOC037-095-112130-
/O.CON.KEAX.SV.W.0029.000000T0000Z-210611T2130Z/
Wyandotte KS-Johnson KS-Cass MO-Jackson MO-
416 PM CDT Fri Jun 11 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 430 PM CDT
FOR EAST CENTRAL WYANDOTTE...EASTERN JOHNSON...NORTHWESTERN CASS AND
SOUTHWESTERN JACKSON COUNTIES...

At 416 PM CDT, a severe thunderstorm was located over Raymore, moving
southeast at 30 mph.

HAZARD...70 mph wind gusts and half dollar size hail.

SOURCE...Radar indicated.

IMPACT...Hail damage to vehicles is expected. Expect considerable 
         tree damage. Wind damage is also likely to mobile homes, 
         roofs, and outbuildings.

Locations impacted include...
  Lake Annette.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 3868 9461 3873 9461 3874 9466 3893 9480
      3908 9472 3907 9444 3889 9447 3882 9446
      3858 9451 3858 9452
TIME...MOT...LOC 2116Z 318DEG 24KT 3878 9449 

HAIL...1.25IN
WIND...70MPH
 
$$

PP

753 
WWUS53 KEAX 112128
SVSEAX

Severe Weather Statement
National Weather Service Kansas City/Pleasant Hill MO
428 PM CDT Fri Jun 11 2021

KSC091-209-MOC037-095-112137-
/O.EXP.KEAX.SV.W.0029.000000T0000Z-210611T2130Z/
Wyandotte KS-Johnson KS-Cass MO-Jackson MO-
428 PM CDT Fri Jun 11 2021

...THE SEVERE THUNDERSTORM WARNING FOR EAST CENTRAL WYANDOTTE...
EASTERN JOHNSON...NORTHWESTERN CASS AND SOUTHWESTERN JACKSON COUNTIES
WILL EXPIRE AT 430 PM CDT...
        
The storm which prompted the warning has moved out of the area.
Therefore, the warning will be allowed to expire.  However gusty
winds are still possible with this thunderstorm.

A Severe Thunderstorm Watch remains in effect until 700 PM CDT for
northeastern and east central Kansas...and west central Missouri.

Remember, a Severe Thunderstorm Warning still remains in effect for
northern Cass County and southeast Jackson County.

LAT...LON 3868 9461 3873 9461 3874 9466 3893 9480
      3908 9472 3907 9444 3889 9447 3882 9446
      3858 9451 3858 9452
TIME...MOT...LOC 2127Z 318DEG 24KT 3873 9443 

$$

PP

The office that day

Everything else NWS Kansas City, MO issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 11, 1:16 PM CDT	Severe Thunderstorm Warning	EAX	Atchison, Doniphan	29 min
Jun 11, 1:41 PM CDT	Severe Thunderstorm Warning	EAX	Atchison, Doniphan	34 min
Jun 11, 2:12 PM CDT	Severe Thunderstorm Warning	EAX	Atchison, Doniphan, Leavenworth	63 min
Jun 11, 2:52 PM CDT	Severe Thunderstorm Warning	EAX	Johnson, Leavenworth, Wyandotte	68 min
Jun 11, 4:02 PM CDT	Areal Flood Advisory	EAX	Leavenworth, Wyandotte	4 hr
Jun 11, 4:57 PM CDT	Severe Thunderstorm Warning	EAX	Linn, Miami	48 min
Jun 11, 5:42 PM CDT	Severe Thunderstorm Warning	EAX	Linn	33 min
Jun 11, 5:58 PM CDT	River Flood Warning	EAX	Johnson	81 min
Jun 11, 12:04 PM CDT	Special Weather Statement	EAX	Atchison	41 min
Jun 11, 12:10 PM CDT	Severe Thunderstorm Warning	EAX	Atchison, Holt	21 min
Jun 11, 2:44 PM CDT	Severe Thunderstorm Warning	EAX	Andrew, Buchanan, Clay, Clinton, DeKalb, Platte	46 min
Jun 11, 2:49 PM CDT	Severe Thunderstorm Warning	EAX	Carroll, Lafayette, Ray	41 min
Jun 11, 3:26 PM CDT	Severe Thunderstorm Warning	EAX	Caldwell, Clay, Clinton, Jackson, Ray	34 min
Jun 11, 3:28 PM CDT	Special Weather Statement	EAX	Lafayette	47 min
Jun 11, 3:37 PM CDT	Severe Thunderstorm Warning	EAX	Cass, Clay, Jackson, Lafayette, Ray	38 min
Jun 11, 3:57 PM CDT	Severe Thunderstorm Warning	EAX	Clay, Clinton, Jackson, Ray	14 min
Jun 11, 4:07 PM CDT	Special Weather Statement	EAX	Pettis	38 min
Jun 11, 4:14 PM CDT	Severe Thunderstorm Warning	EAX	Cass, Clay, Jackson, Johnson, Lafayette, Ray	46 min
Jun 11, 4:25 PM CDT	Severe Thunderstorm Warning	EAX	Johnson, Lafayette, Pettis, Saline	35 min
Jun 11, 4:42 PM CDT	Severe Thunderstorm Warning	EAX	Bates, Cass, Henry, Johnson, Pettis	33 min
Jun 11, 5:08 PM CDT	Severe Thunderstorm Warning	EAX	Henry, Johnson, Lafayette, Pettis, Saline	37 min

Nearby

Severe Thunderstorm Warnings in Kansas, 2021 Severe Thunderstorm Warnings in Missouri, 2021 Every severe thunderstorm warning 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.