Alert archive / Missouri / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 25, NWS Kansas City, MO

June 11, 2021Johnson County, Leavenworth County, Wyandotte County, Kansas; 4 counties in Missouri

NWS Kansas City, MO issued this severe thunderstorm warning at Jun 11, 2021, 2:52 PM CDT for Johnson County, Leavenworth County, Wyandotte County, Kansas; 4 counties in Missouri. It was in force for 68 min. 17 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, 2:52 PM CDT (19:52 UTC)
Expired: Jun 11, 2021, 4:00 PM CDT
In force: 68 min
Issued by: NWS Kansas City, MO
Area: Storm-based polygon
Hail: 1.0 in
Wind: 70.0 mph

Counties Johnson County, KS, Leavenworth County, KS, Wyandotte County, KS, Clay County, MO, Clinton County, MO, Jackson County, MO, Platte County, MO

The radar

The Pleasant Hill radar (KEAX), 62 km from the middle of the area, began a volume at 19:55 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 was reported inside it

Time	Report	Where	Remark
Jun 11, 3:11 PM CDT	TSTM WND DMG	2 N Piper, KS	DELAYED REPORT. NUMEROUS PHOTOS OF SNAPPED TREES IN AREAS JUST WEST OF PIPER HIGH SCHOOL.
Jun 11, 3:15 PM CDT	TSTM WND DMG	Smithville, MO	DELAYED REPORT. TEN INCH TREE LIMBS DOWN.
Jun 11, 3:22 PM CDT	TSTM WND DMG	Shawnee, KS	6 INCH LARGE TREE BRANCH DOWN.
Jun 11, 3:27 PM CDT	TSTM WND GST 90	3 Nne Mosby, MO	MULTIPLE 1 FOOT IN DIAMETER TREES DOWN IN BETWEEN KEARNEY, MO AND EXCELSIOR SPRINGS, MO. TREES WERE REPORTED HEALTHY WITH NUMEROUS REPORTED DOWN. DEBRIS ON GROUND ALONG WITH ROAD SIGNS REPORTED DOWN.
Jun 11, 3:30 PM CDT	TSTM WND DMG	1 Ese Basehor, KS	TREE ON POWER LINES AND 3 POWER POLES DOWN.
Jun 11, 3:30 PM CDT	TSTM WND DMG	3 W Excelsior Estates, MO	DELAYED REPORT. AT WATKINS MILL STATE PARK THERE WERE APPROXIMATELY 25 TO 30 TREES DOWN ACROSS THE CAMPGROUND WITH TREES ON TOP OF CARS AND CAMPERS. AS OF THE REPORT TIME, THERE WERE NO INJURIES.
Jun 11, 3:30 PM CDT	TSTM WND GST 65	Holt, MO	WINDS KNOCKED DOWN STREET LAMPS, SEVERAL 2-2.5 INCH TREE BRANCHES ON ROADWAYS. SPORADIC PEA-SIZED HAIL REPORTED.
Jun 11, 3:33 PM CDT	TSTM WND GST 60	1 Nnw Kearney, MO	ESTIMATED 60MPH 33 HWY ONE HALF MILE EAST OF 92 CLAY COUNTY.
Jun 11, 3:38 PM CDT	TSTM WND DMG	3 Wsw Stanley, KS	DELAYED REPORT. SEVERAL 6 TO 12 INCH TREES DOWN NEAR THE INTERSECTION OF 159TH AND QUIVIRA IN OLATHE. TIME ESTIMATED FROM RADAR.
Jun 11, 3:40 PM CDT	TSTM WND DMG	Roeland Park, KS	DELAYED REPORT. TEN INCH TREE LIMBS DOWN IN ROELAND PARK.
Jun 11, 3:45 PM CDT	TSTM WND DMG	Basehor, KS	MOTORIST HIT DOWN POWER LINE IN ROADWAY IN AREA OF 153 TERR/PARALLEL ROAD (BASEHOR, KS).
Jun 11, 3:46 PM CDT	TSTM WND DMG	5 S Kansas City, MO	DELAYED REPORT. TEN INCH TREE LIMBS DOWN IN BROOKSIDE.
Jun 11, 3:48 PM CDT	HAIL 1.5	2 Sse Leawood, KS	DELAYED REPORT. 435 AND STATELINE.
Jun 11, 4:00 PM CDT	TSTM WND GST 62	Mosby, MO
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

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, 7.9 hours before the alert went out and 64 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.

071 
WUUS53 KEAX 111952
SVREAX
KSC091-103-209-MOC047-049-095-165-112100-
/O.NEW.KEAX.SV.W.0025.210611T1952Z-210611T2100Z/

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

The National Weather Service in Pleasant Hill has issued a

* Severe Thunderstorm Warning for...
  Wyandotte County in northeastern Kansas...
  Southeastern Leavenworth County in northeastern Kansas...
  Johnson County in east central Kansas...
  Clay County in west central Missouri...
  Southwestern Clinton County in northwestern Missouri...
  Platte County in west central Missouri...
  Northwestern Jackson County in west central Missouri...

* Until 400 PM CDT.

* At 252 PM CDT, severe thunderstorms were located along a line
  extending from near Dearborn to 6 miles southwest of Tonganoxie,
  moving east at 35 mph.

  HAZARD...70 mph wind gusts and quarter 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.

* Severe thunderstorms will be near...
  Camden Point around 300 PM CDT.
  De Soto and Trimble around 310 PM CDT.

Other locations in the path of these severe thunderstorms include
Smithville, Olathe, Shawnee, Lenexa, Kearney, Lake Quivira, Holt,
Merriam, Mission, Countryside, Prairie Village, Excelsior Springs and
Lawson.

This includes the following highways...
 Interstate 70 in Missouri between mile markers 0 and 10.
 Interstate 70 in Kansas between mile markers 410 and 423.
 Interstate 35 in Missouri between mile markers 0 and 32.
 Interstate 35 in Kansas between mile markers 202 and 235.
 Interstate 29 between mile markers 0 and 24.
 Interstate 635 between mile markers 0 and 12.
 Interstate 470 near mile marker 0.
 Interstate 435 between mile markers 0 and 83.
 Kansas Turnpike between mile markers 206 and 226.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3950 9473 3944 9421 3941 9421 3885 9459
      3874 9500 3874 9506 3898 9506 3899 9507
      3898 9509 3896 9508 3898 9516 3896 9517
      3896 9519 3905 9519
TIME...MOT...LOC 1952Z 288DEG 29KT 3950 9471 3906 9518 

HAIL...1.00IN
WIND...70MPH
 
$$

PP

1 follow-up statement

852 
WWUS53 KEAX 112031
SVSEAX

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

KSC091-103-209-MOC047-049-095-165-112100-
/O.CON.KEAX.SV.W.0025.000000T0000Z-210611T2100Z/
Wyandotte KS-Leavenworth KS-Johnson KS-Clay MO-Clinton MO-Platte MO-
Jackson MO-
331 PM CDT Fri Jun 11 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 400 PM CDT
FOR WYANDOTTE...CENTRAL LEAVENWORTH...EASTERN JOHNSON...CLAY...
SOUTHWESTERN CLINTON...SOUTHEASTERN PLATTE AND NORTHWESTERN JACKSON
COUNTIES...

At 331 PM CDT, severe thunderstorms were located along a line
extending from near Kearney to Lenexa, moving east at 35 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...
  Kearney, Holt, Prairie Village, Excelsior Springs, Fairway, 
  Mission Hills, Lawson, Countryside, Leawood and Grandview.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3942 9479 3948 9455 3944 9421 3941 9421
      3885 9459 3878 9486 3903 9497 3917 9506
TIME...MOT...LOC 2031Z 288DEG 29KT 3940 9434 3897 9481 

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

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, 3:59 PM CDT	Severe Thunderstorm Warning	EAX	Johnson, Miami, Wyandotte	31 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 Missouri, 2021 Severe Thunderstorm Warnings in Kansas, 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.