Alert archive / Missouri / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 137, NWS Kansas City, MO

September 20, 2021Clay County, Jackson County, Ray County, Missouri

NWS Kansas City, MO issued this severe thunderstorm warning at Sep 20, 2021, 6:23 PM CDT for Clay County, Jackson County, Ray County, Missouri. It was in force for 52 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: Sep 20, 2021, 6:23 PM CDT (23:23 UTC)
Expired: Sep 20, 2021, 7:15 PM CDT
In force: 52 min
Issued by: NWS Kansas City, MO
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Clay County, MO, Jackson County, MO, Ray County, MO

The radar

The Pleasant Hill radar (KEAX), 54 km from the middle of the area, began a volume at 23:27 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, 6:27 PM CDT	HAIL 1.25	Liberty, MO
Sep 20, 6:35 PM CDT	TSTM WND GST 53	2 Nnw Mosby, MO	KGPH.
Sep 20, 6:37 PM CDT	HAIL 0.75	1 N Excelsior Springs, MO	DELAYED REPORT FROM MPING.
Sep 20, 6:51 PM CDT	TSTM WND DMG	1 Nne Richmond, MO	DELAYED REPORT FROM MPING: 1-INCH TREE LIMBS BROKEN; SHINGLES BLOWN OFF.

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, 11.4 hours before the alert went out and 133 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.

011 
WUUS53 KEAX 202323
SVREAX
MOC047-095-177-210015-
/O.NEW.KEAX.SV.W.0137.210920T2323Z-210921T0015Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Kansas City/Pleasant Hill MO
623 PM CDT Mon Sep 20 2021

The National Weather Service in Pleasant Hill has issued a

* Severe Thunderstorm Warning for...
  Northeastern Clay County in west central Missouri...
  Western Ray County in west central Missouri...
  North central Jackson County in west central Missouri...

* Until 715 PM CDT.

* At 623 PM CDT, a severe thunderstorm was located near Kearney,
  moving east at 35 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, Liberty, Excelsior Springs, Kearney, Richmond, Lawson,
  Pleasant Valley, Orrick, Glenaire, Henrietta, Crystal Lakes,
  Missouri City, Excelsior Estates, Woods Heights, Rayville, Camden,
  Mosby, Homestead, Fleming and Prathersville.

This includes Interstate 35 in Missouri between mile markers 13 and
30.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3941 9446 3952 9390 3918 9390 3918 9396
      3921 9398 3919 9404 3921 9449
TIME...MOT...LOC 2323Z 270DEG 29KT 3932 9435 

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

$$

Klaus

3 follow-up statements

235 
WWUS53 KEAX 202338
SVSEAX

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

MOC047-095-177-210015-
/O.CON.KEAX.SV.W.0137.000000T0000Z-210921T0015Z/
Clay MO-Ray MO-Jackson MO-
638 PM CDT Mon Sep 20 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 715 PM CDT
FOR NORTHEASTERN CLAY...WESTERN RAY AND NORTH CENTRAL JACKSON
COUNTIES...

At 637 PM CDT, a severe thunderstorm was located over Woods Heights,
or over Excelsior Springs, moving east at 35 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...
Liberty, Excelsior Springs, Kearney, Richmond, Lawson, Orrick,
Henrietta, Crystal Lakes, Missouri City, Excelsior Estates, Woods
Heights, Rayville, Camden, Mosby, Homestead, Fleming, Prathersville
and Knoxville.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3952 9390 3918 9390 3918 9396 3921 9398
      3919 9404 3921 9440 3944 9433
TIME...MOT...LOC 2337Z 270DEG 29KT 3932 9420 

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

$$

Klaus

374 
WWUS53 KEAX 210005
SVSEAX

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

MOC047-095-210013-
/O.CAN.KEAX.SV.W.0137.000000T0000Z-210921T0015Z/
Clay MO-Jackson MO-
705 PM CDT Mon Sep 20 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN CLAY AND NORTH
CENTRAL JACKSON COUNTIES IS CANCELLED...
    
The severe thunderstorm which prompted the warning has moved out of 
eastern Clay and western Ray counties. Therefore, the warning has 
been cancelled for eastern Clay and western Ray counties only. The 
Severe Thunderstorm Warning is still in effect for eastern Ray and 
Carroll counties.

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

LAT...LON 3952 9390 3918 9390 3918 9396 3921 9398
      3919 9404 3919 9405 3948 9407
TIME...MOT...LOC 0003Z 270DEG 29KT 3932 9392 

$$

MOC177-210015-
/O.CON.KEAX.SV.W.0137.000000T0000Z-210921T0015Z/
Ray MO-
705 PM CDT Mon Sep 20 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 715 PM CDT
FOR CENTRAL RAY COUNTY...

At 703 PM CDT, a severe thunderstorm was located near Richmond,
moving east at 35 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...
Richmond, Henrietta, Rayville, Camden, Fleming and Knoxville. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3952 9390 3918 9390 3918 9396 3921 9398
      3919 9404 3919 9405 3948 9407
TIME...MOT...LOC 0003Z 270DEG 29KT 3932 9392 

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

$$

Klaus

274 
WWUS53 KEAX 210007
SVSEAX

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

MOC177-210016-
/O.EXP.KEAX.SV.W.0137.000000T0000Z-210921T0015Z/
Ray MO-
707 PM CDT Mon Sep 20 2021

...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL RAY COUNTY WILL EXPIRE
AT 715 PM CDT...
        
The storm which prompted the warning has moved out of central Ray 
County. Therefore, the warning will be allowed to expire for central 
Ray county. However gusty winds and heavy rain are still possible 
with this thunderstorm.

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

Remember, a Severe Thunderstorm Warning still remains in effect for
eastern Ray and Carroll counties.

LAT...LON 3952 9390 3918 9390 3918 9396 3921 9398
      3919 9404 3919 9405 3948 9407
TIME...MOT...LOC 0006Z 270DEG 29KT 3932 9391 

$$

Klaus

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 20, 4:00 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, 5:29 PM CDT	Severe Thunderstorm Warning Considerable damage threat	EAX	Jackson	46 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, 6:13 PM CDT	Severe Thunderstorm Warning	EAX	Bates	47 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 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.