Alert archive / Kansas / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 133, NWS Kansas City, MO

September 20, 2021Johnson County, Wyandotte County, Kansas; Jackson County, Missouri

NWS Kansas City, MO issued this severe thunderstorm warning at Sep 20, 2021, 5:29 PM CDT for Johnson County, Wyandotte County, Kansas; Jackson County, Missouri. It was in force for 46 min. 2 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: Sep 20, 2021, 5:29 PM CDT (22:29 UTC)
Expired: Sep 20, 2021, 6:15 PM CDT
In force: 46 min
Issued by: NWS Kansas City, MO
Area: Storm-based polygon
Damage threat: Considerable
Hail: 2.0 in
Wind: 60.0 mph

Counties Johnson County, KS, Wyandotte County, KS, Jackson County, MO

The radar

The Pleasant Hill radar (KEAX), 38 km from the middle of the area, began a volume at 22:30 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
Sep 20, 5:30 PM CDT	HAIL 1	2 W Merriam, KS	DELAYED REPORT FROM MPING.
Sep 20, 5:40 PM CDT	HAIL 1.75	2 W Merriam, 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
Sep 20, 3:25 PM CDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Topeka, KS (KTOP), launched 12:00Z, 10.5 hours before the alert went out and 95 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: 583 J/kg
Mixed-layer CIN: -288 J/kg
Mixed-layer LCL: 1142 m above ground
0-6 km bulk shear: 14 kt
0-1 km storm-relative helicity: 59 m²/s²
0-3 km storm-relative helicity: 185 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.5

Open this sounding in Storm Lab

The text

As transmitted.

694 
WUUS53 KEAX 202229
SVREAX
KSC091-209-MOC095-202315-
/O.NEW.KEAX.SV.W.0133.210920T2229Z-210920T2315Z/

BULLETIN - EAS ACTIVATION REQUESTED
Severe Thunderstorm Warning
National Weather Service Kansas City/Pleasant Hill MO
529 PM CDT Mon Sep 20 2021

The National Weather Service in Pleasant Hill has issued a

* Severe Thunderstorm Warning for...
  Southeastern Wyandotte County in northeastern Kansas...
  Northeastern Johnson County in east central Kansas...
  West central Jackson County in west central Missouri...

* Until 615 PM CDT.

* At 528 PM CDT, a severe thunderstorm was located over Merriam,
  moving northeast at 25 mph.

  HAZARD...Two inch hail and 60 mph wind gusts.

  SOURCE...Radar indicated. At 522 PM, 1 inch hail was reported 4 
           miles WSW of Shawnee in Johnson County, KS.

  IMPACT...People and animals outdoors will be injured. Expect hail 
           damage to roofs, siding, windows, and vehicles. Expect 
           wind damage to roofs, siding, and trees.

* Locations impacted include...
  Kansas City, Overland Park, Independence, Lee's Summit, Shawnee,
  Lenexa, Leawood, Raytown, Prairie Village, Merriam, Mission,
  Fairway, Mission Hills, Sugar Creek, Westwood, Lake Quivira,
  Westwood Hills, Mission Woods, Countryside and Roeland Park.

This includes the following highways...
 Interstate 70 in Missouri between mile markers 1 and 13.
 Interstate 70 in Kansas between mile markers 421 and 422.
 Interstate 35 in Missouri between mile markers 0 and 4.
 Interstate 35 in Kansas between mile markers 223 and 235.
 Interstate 635 between mile markers 0 and 2.
 Interstate 435 near mile marker 1, near mile marker 4, near mile
marker 7, and between mile markers 56 and 70.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3915 9449 3912 9446 3914 9442 3896 9436
      3894 9477 3904 9479
TIME...MOT...LOC 2228Z 247DEG 23KT 3899 9473 

THUNDERSTORM DAMAGE THREAT...CONSIDERABLE
HAIL THREAT...OBSERVED
MAX HAIL SIZE...2.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

Klaus

2 follow-up statements

586 
WWUS53 KEAX 202243
SVSEAX

Severe Weather Statement
National Weather Service Kansas City/Pleasant Hill MO
543 PM CDT Mon Sep 20 2021

KSC091-209-MOC095-202315-
/O.CON.KEAX.SV.W.0133.000000T0000Z-210920T2315Z/
Wyandotte KS-Johnson KS-Jackson MO-
543 PM CDT Mon Sep 20 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 615 PM CDT
FOR EAST CENTRAL WYANDOTTE...NORTHEASTERN JOHNSON AND WEST CENTRAL
JACKSON COUNTIES...

At 542 PM CDT, a severe thunderstorm was located over Fairway, moving
northeast at 25 mph.

HAZARD...Two inch hail and 60 mph wind gusts.

SOURCE...Radar indicated. At 528 PM 2 miles southeast of Lake 
         Quivira, estimated 1 inch hail was reported.

IMPACT...People and animals outdoors will be injured. Expect hail 
         damage to roofs, siding, windows, and vehicles. Expect wind 
         damage to roofs, siding, and trees.

Locations impacted include...
Kansas City, Overland Park, Independence, Lee's Summit, Leawood,
Raytown, Prairie Village, Mission, Fairway, Mission Hills, Sugar
Creek, Westwood, Westwood Hills, Mission Woods, Countryside, Roeland
Park and Unity Village.

This includes the following highways...
 Interstate 70 in Missouri between mile markers 1 and 13.
 Interstate 70 in Kansas between mile markers 421 and 422.
 Interstate 35 in Missouri between mile markers 0 and 4.
 Interstate 35 in Kansas between mile markers 231 and 235.
 Interstate 635 between mile markers 0 and 3.
 Interstate 435 between mile markers 56 and 70.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3915 9449 3912 9446 3914 9442 3896 9436
      3895 9465 3908 9469
TIME...MOT...LOC 2242Z 247DEG 23KT 3903 9462 

THUNDERSTORM DAMAGE THREAT...CONSIDERABLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...2.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

Klaus

904 
WWUS53 KEAX 202258
SVSEAX

Severe Weather Statement
National Weather Service Kansas City/Pleasant Hill MO
558 PM CDT Mon Sep 20 2021

KSC091-209-202307-
/O.CAN.KEAX.SV.W.0133.000000T0000Z-210920T2315Z/
Wyandotte KS-Johnson KS-
558 PM CDT Mon Sep 20 2021

...THE SEVERE THUNDERSTORM WARNING FOR EAST CENTRAL WYANDOTTE AND
NORTHEASTERN JOHNSON COUNTIES IS CANCELLED...
    
The severe thunderstorm which prompted the warning has moved out of 
Wyandotte and Johnson counties in Kansas. Therefore, the warning has 
been cancelled. The warning is still in effect for southwest Jackson 
County until 615PM.

A Severe Thunderstorm Watch remains in effect until 1000 PM CDT for
west central Missouri.

LAT...LON 3913 9449 3913 9447 3912 9446 3914 9442
      3903 9438 3901 9451 3911 9454
TIME...MOT...LOC 2257Z 247DEG 23KT 3907 9450 

$$

MOC095-202315-
/O.CON.KEAX.SV.W.0133.000000T0000Z-210920T2315Z/
Jackson MO-
558 PM CDT Mon Sep 20 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 615 PM CDT
FOR WEST CENTRAL JACKSON COUNTY...

At 557 PM CDT, a severe thunderstorm was located near Kansas City,
moving northeast at 25 mph.

HAZARD...60 mph wind gusts and quarter size hail.

SOURCE...Radar indicated.

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

Locations impacted include...
Kansas City, Independence, Raytown and Sugar Creek. 

This includes the following highways...
 Interstate 70 in Missouri between mile markers 6 and 13.
 Interstate 435 between mile markers 58 and 65.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3913 9449 3913 9447 3912 9446 3914 9442
      3903 9438 3901 9451 3911 9454
TIME...MOT...LOC 2257Z 247DEG 23KT 3907 9450 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

Klaus

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 20, 4:06 PM CDT	Special Weather Statement	EAX	Atchison	24 min
Sep 20, 5:02 PM CDT	Severe Thunderstorm Warning	EAX	Johnson, Wyandotte	28 min
Sep 20, 6:13 PM CDT	Severe Thunderstorm Warning	EAX	Linn	47 min
Sep 20, 4:00 PM CDT	Special Weather Statement	EAX	Buchanan	30 min
Sep 20, 4:12 PM CDT	Severe Thunderstorm Warning	EAX	Harrison, Worth	33 min
Sep 20, 4:36 PM CDT	Special Weather Statement	EAX	DeKalb	24 min
Sep 20, 4:57 PM CDT	Severe Thunderstorm Warning	EAX	Daviess, DeKalb, Gentry, Harrison	33 min
Sep 20, 5:13 PM CDT	Severe Thunderstorm Warning	EAX	Clay, Clinton, Platte	47 min
Sep 20, 5:33 PM CDT	Severe Thunderstorm Warning	EAX	Clay, Clinton, Platte	42 min
Sep 20, 5:49 PM CDT	Special Weather Statement	EAX	Daviess	26 min
Sep 20, 6:00 PM CDT	Severe Thunderstorm Warning	EAX	Clay, Jackson	45 min
Sep 20, 6:23 PM CDT	Severe Thunderstorm Warning	EAX	Clay, Jackson, Ray	52 min
Sep 20, 6:34 PM CDT	Special Weather Statement	EAX	Cass	26 min
Sep 20, 6:47 PM CDT	Severe Thunderstorm Warning	EAX	Carroll, Lafayette, Ray	43 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.