Alert archive / Missouri / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 155, NWS Kansas City, MO

December 15, 2021Cass County, Jackson County, Missouri; Johnson County, Wyandotte County, Kansas

NWS Kansas City, MO issued this severe thunderstorm warning at Dec 15, 2021, 6:00 PM CST for Cass County, Jackson County, Missouri; Johnson County, Wyandotte County, Kansas. It was in force for 45 min. 5 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: Dec 15, 2021, 6:00 PM CST (00:00 UTC)
Expired: Dec 15, 2021, 6:45 PM CST
In force: 45 min
Issued by: NWS Kansas City, MO
Area: Storm-based polygon
Damage threat: Considerable
Hail: 2.0 in
Wind: 70.0 mph

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

The radar

The Pleasant Hill radar (KEAX), 36 km from the middle of the area, began a volume at 00:06 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
Dec 15, 6:00 PM CST	TSTM WND DMG	1 Sse Independence, MO	SEVERAL POWER POLES DOWN AND AN ESTIMATED 2500 PEOPLE OUT OF POWER.
Dec 15, 6:01 PM CST	TSTM WND DMG	2 Wsw Merriam, KS	TREE ON HOUSE NEAR W 67TH ST AND NIEMAN RD. TIME ESTIMATED VIA RADAR.
Dec 15, 6:20 PM CST	HAIL 0.75	Independence, MO	EOC REPORTED UP TO PENNY SIZED HAIL.
Dec 15, 6:45 PM CST	TSTM WND GST 60	1 Nw Lake Winnebago, MO
Dec 15, 6:53 PM CST	TSTM WND GST 65	2 N Pleasant Hill, MO	ESTIMATED WIND GUST AT NWS KANSAS CITY.

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
Dec 15, 3:18 PM CST	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

Topeka, KS (KTOP), launched 00:00Z, 0.0 hours before the alert went out and 107 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 2425 m above ground
0-6 km bulk shear: 99 kt
0-1 km storm-relative helicity: -149 m²/s²
0-3 km storm-relative helicity: 201 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

818 
WUUS53 KEAX 160000
SVREAX
KSC091-209-MOC037-095-160045-
/O.NEW.KEAX.SV.W.0155.211216T0000Z-211216T0045Z/

BULLETIN - EAS ACTIVATION REQUESTED
Severe Thunderstorm Warning
National Weather Service Kansas City/Pleasant Hill MO
600 PM CST Wed Dec 15 2021

The National Weather Service in Pleasant Hill has issued a

* Severe Thunderstorm Warning for...
  Southeastern Wyandotte County in northeastern Kansas...
  Eastern Johnson County in east central Kansas...
  Northwestern Cass County in west central Missouri...
  Jackson County in west central Missouri...

* Until 645 PM CST.

* At 559 PM CST, a severe thunderstorm was located near Olathe,
  moving east at 60 mph.

  HAZARD...Two inch hail and 70 mph wind gusts.

  SOURCE...Trained weather spotters.

  IMPACT...People and animals outdoors will be injured. Expect hail 
           damage to roofs, siding, windows, and vehicles. Expect 
           considerable tree damage. Wind damage is also likely to 
           mobile homes, roofs, and outbuildings.

* Locations impacted include...
  Kansas City, Overland Park, Olathe, Independence, Lee's Summit,
  Shawnee, Blue Springs, Lenexa, Leawood, Raytown, Grandview, Belton,
  Prairie Village, Raymore, Gardner, Grain Valley, Merriam, Mission,
  Pleasant Hill and Spring Hill.

This includes the following highways...
 Interstate 70 in Missouri between mile markers 1 and 29.
 Interstate 35 in Missouri between mile markers 0 and 4.
 Interstate 35 in Kansas between mile markers 211 and 235.
 Interstate 635 between mile markers 0 and 2.
 Interstate 470 between mile markers 0 and 16.
 Interstate 435 between mile markers 0 and 8, and between mile
markers 57 and 83.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Prepare immediately for large hail and damaging winds. People outside
should move immediately to shelter inside a strong building. Stay
away from windows.

&&

LAT...LON 3903 9486 3909 9461 3911 9460 3915 9452
      3912 9444 3917 9440 3920 9440 3916 9437
      3924 9429 3923 9424 3921 9421 3921 9417
      3918 9419 3917 9414 3914 9410 3882 9412
      3875 9489
TIME...MOT...LOC 2359Z 252DEG 51KT 3890 9476 

THUNDERSTORM DAMAGE THREAT...CONSIDERABLE
HAIL THREAT...OBSERVED
MAX HAIL SIZE...2.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...70 MPH

$$

CDB

1 follow-up statement

950 
WWUS53 KEAX 160017
SVSEAX

Severe Weather Statement
National Weather Service Kansas City/Pleasant Hill MO
617 PM CST Wed Dec 15 2021

KSC091-209-MOC037-160026-
/O.CAN.KEAX.SV.W.0155.000000T0000Z-211216T0045Z/
Wyandotte KS-Johnson KS-Cass MO-
617 PM CST Wed Dec 15 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN WYANDOTTE...
EASTERN JOHNSON AND NORTHWESTERN CASS 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 CST for
east central Kansas...and west central Missouri. A Severe
Thunderstorm Watch also remains in effect until midnight CST for west
central Missouri.

LAT...LON 3885 9461 3911 9460 3915 9452 3912 9444
      3917 9440 3920 9440 3916 9437 3924 9429
      3923 9424 3921 9421 3921 9417 3918 9419
      3917 9414 3914 9410 3883 9412
TIME...MOT...LOC 0016Z 252DEG 51KT 3898 9446 

$$

MOC095-160045-
/O.CON.KEAX.SV.W.0155.000000T0000Z-211216T0045Z/
Jackson MO-
617 PM CST Wed Dec 15 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 645 PM CST
FOR JACKSON COUNTY...

At 616 PM CST, a severe thunderstorm was located over Raytown, moving
east at 60 mph.

HAZARD...70 mph wind gusts and quarter size hail.

SOURCE...Trained weather spotters.

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...
Kansas City, Independence, Lee's Summit, Blue Springs, Raytown,
Grandview, Grain Valley, Greenwood, North Kansas City, Sugar Creek,
Buckner, Lake Lotawana, Courtney, Lone Jack, Lake Tapawingo, Sibley,
Missouri City, Levasy, River Bend and Napoleon.

This includes the following highways...
 Interstate 70 in Missouri between mile markers 1 and 29.
 Interstate 35 in Missouri between mile markers 1 and 4.
 Interstate 470 between mile markers 0 and 16.
 Interstate 435 between mile markers 57 and 75.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Prepare immediately for large hail and damaging winds. People outside
should move to a shelter, inside a strong building and away from
windows.

&&

LAT...LON 3885 9461 3911 9460 3915 9452 3912 9444
      3917 9440 3920 9440 3916 9437 3924 9429
      3923 9424 3921 9421 3921 9417 3918 9419
      3917 9414 3914 9410 3883 9412
TIME...MOT...LOC 0016Z 252DEG 51KT 3898 9446 

THUNDERSTORM DAMAGE THREAT...CONSIDERABLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...70 MPH

$$

CDB

The office that day

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

Issued	Product	Office	Counties	Lasted
Dec 15, 6:11 PM CST	Severe Thunderstorm Warning Considerable damage threat	EAX	Bates, Cass	64 min
Dec 15, 6:15 PM CST	Severe Thunderstorm Warning Considerable damage threat	EAX	Caldwell, Carroll, Clay, Clinton, Daviess, Livingston and 1 more	60 min
Dec 15, 6:24 PM CST	Severe Thunderstorm Warning Considerable damage threat	EAX	Daviess, Grundy, Harrison, Mercer, Putnam, Sullivan	66 min
Dec 15, 6:35 PM CST	Severe Thunderstorm Warning Considerable damage threat	EAX	Carroll, Jackson, Lafayette	40 min
Dec 15, 6:43 PM CST	Severe Thunderstorm Warning Considerable damage threat	EAX	Cass, Jackson, Johnson	47 min
Dec 15, 7:03 PM CST	Severe Thunderstorm Warning Considerable damage threat	EAX	Adair, Carroll, Chariton, Grundy, Linn, Livingston and 7 more	87 min
Dec 15, 7:08 PM CST	Severe Thunderstorm Warning Considerable damage threat	EAX	Bates, Carroll, Cass, Chariton, Cooper, Henry and 7 more	82 min
Dec 15, 8:25 PM CST	Severe Thunderstorm Warning	EAX	Cooper, Howard, Randolph	35 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.