Alert archive / Missouri / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 84, NWS Kansas City, MO

July 10, 2021Clay County, Jackson County, Platte County, Missouri; Johnson County, Leavenworth County, Wyandotte County, Kansas

NWS Kansas City, MO issued this severe thunderstorm warning at Jul 10, 2021, 2:09 AM CDT for Clay County, Jackson County, Platte County, Missouri; Johnson County, Leavenworth County, Wyandotte County, Kansas. It was in force for 51 min. 1 report 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: Jul 10, 2021, 2:09 AM CDT (07:09 UTC)
Expired: Jul 10, 2021, 3:00 AM CDT
In force: 51 min
Issued by: NWS Kansas City, MO
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

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

The radar

The Pleasant Hill radar (KEAX), 68 km from the middle of the area, began a volume at 07:12 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
Jul 10, 2:44 AM CDT	TSTM WND DMG	2 Wsw Kansas City Kansa, KS	DELAYED REPORT. SEVERAL LARGE TREE LIMBS DOWN. ONE LIMB OF 12+ INCHES DOWN.

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
Jul 9, 9:58 PM CDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Topeka, KS (KTOP), launched 00:00Z, 7.2 hours before the alert went out and 55 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: 2790 J/kg
Mixed-layer CIN: -39 J/kg
Mixed-layer LCL: 1645 m above ground
0-6 km bulk shear: 32 kt
0-1 km storm-relative helicity: 45 m²/s²
0-3 km storm-relative helicity: 132 m²/s²
Significant tornado parameter: 0.4
Supercell composite: 6.9

Open this sounding in Storm Lab

The text

As transmitted.

360 
WUUS53 KEAX 100709
SVREAX
KSC091-103-209-MOC047-095-165-100800-
/O.NEW.KEAX.SV.W.0084.210710T0709Z-210710T0800Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Kansas City/Pleasant Hill MO
209 AM CDT Sat Jul 10 2021

The National Weather Service in Pleasant Hill has issued a

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

* Until 300 AM CDT.

* At 209 AM CDT, severe thunderstorms were located along a line
  extending from near Easton to near Perry to near Dover, moving east
  at 55 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

  IMPACT...Expect damage to roofs, siding, and trees.

* Locations impacted include...
  Kansas City, Overland Park, Olathe, Independence, Shawnee, Lenexa,
  Leavenworth, Leawood, Raytown, Liberty, Gladstone, Prairie Village,
  Gardner, Lansing, Merriam, Mission, Bonner Springs, De Soto,
  Parkville and Spring Hill.

This includes the following highways...
 Interstate 70 in Missouri between mile markers 0 and 9.
 Interstate 70 in Kansas between mile markers 410 and 423.
 Interstate 35 in Missouri between mile markers 0 and 18.
 Interstate 35 in Kansas between mile markers 203 and 235.
 Interstate 29 between mile markers 0 and 12.
 Interstate 635 between mile markers 0 and 12.
 Interstate 435 between mile markers 0 and 28, between mile markers
45 and 67, and between mile markers 73 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 3931 9518 3930 9443 3902 9447 3874 9478
      3874 9498 3875 9506 3898 9506 3899 9508
      3896 9508 3896 9509 3897 9511 3897 9513
      3898 9516 3896 9517 3897 9519
TIME...MOT...LOC 0709Z 277DEG 47KT 3940 9517 3914 9537 3894 9597 

HAIL...<.75IN
WIND...60MPH
 
$$

Leighton

2 follow-up statements

923 
WWUS53 KEAX 100752
SVSEAX

Severe Weather Statement
National Weather Service Kansas City/Pleasant Hill MO
252 AM CDT Sat Jul 10 2021

KSC103-100802-
/O.CAN.KEAX.SV.W.0084.000000T0000Z-210710T0800Z/
Leavenworth KS-
252 AM CDT Sat Jul 10 2021

...THE SEVERE THUNDERSTORM WARNING FOR LEAVENWORTH COUNTY IS
CANCELLED...

The storms which prompted the warning have moved out of the warned 
area. Therefore, the warning has been cancelled.

A Severe Thunderstorm Watch remains in effect until 500 AM CDT for
northeastern and east central Kansas...and west central Missouri.

LAT...LON 3898 9506 3897 9504 3900 9502 3898 9497
      3900 9493 3898 9492 3899 9491 3920 9490
      3921 9478 3922 9483 3926 9483 3931 9490
      3930 9443 3902 9447 3874 9478 3875 9506
TIME...MOT...LOC 0752Z 277DEG 47KT 3934 9452 3908 9472 3888 9532 

$$

KSC091-209-MOC047-095-165-100800-
/O.CON.KEAX.SV.W.0084.000000T0000Z-210710T0800Z/
Wyandotte KS-Johnson KS-Clay MO-Platte MO-Jackson MO-
252 AM CDT Sat Jul 10 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 300 AM CDT
FOR WYANDOTTE...JOHNSON...SOUTHWESTERN CLAY...SOUTHEASTERN PLATTE AND
NORTHWESTERN JACKSON COUNTIES...

At 252 AM CDT, severe thunderstorms were located along a line
extending from near Smithville to near Kansas City to near Lone Star,
moving east at 55 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

IMPACT...Expect damage to roofs, siding, and trees.

Locations impacted include...
Kansas City, Overland Park, Olathe, Independence, Shawnee, Lenexa,
Leawood, Raytown, Liberty, Gladstone, Prairie Village, Gardner,
Merriam, Mission, Bonner Springs, De Soto, Parkville, Spring Hill,
Edwardsville and North Kansas City.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3898 9506 3897 9504 3900 9502 3898 9497
      3900 9493 3898 9492 3899 9491 3920 9490
      3921 9478 3922 9483 3926 9483 3931 9490
      3930 9443 3902 9447 3874 9478 3875 9506
TIME...MOT...LOC 0752Z 277DEG 47KT 3934 9452 3908 9472 3888 9532 

HAIL...<.75IN
WIND...60MPH
 
$$

Leighton

606 
WWUS53 KEAX 100759
SVSEAX

Severe Weather Statement
National Weather Service Kansas City/Pleasant Hill MO
259 AM CDT Sat Jul 10 2021

KSC091-209-MOC047-095-165-100808-
/O.EXP.KEAX.SV.W.0084.000000T0000Z-210710T0800Z/
Wyandotte KS-Johnson KS-Clay MO-Platte MO-Jackson MO-
259 AM CDT Sat Jul 10 2021

...THE SEVERE THUNDERSTORM WARNING FOR WYANDOTTE...JOHNSON...
SOUTHWESTERN CLAY...SOUTHEASTERN PLATTE AND NORTHWESTERN JACKSON
COUNTIES WILL EXPIRE AT 300 AM CDT...
            
The storms which prompted the warning have weakened below severe
limits, and no longer pose an immediate threat to life or property.
Therefore, the warning will be allowed to expire.  However small
hail, gusty winds and heavy rain are still possible with these
thunderstorms.

A Severe Thunderstorm Watch remains in effect until 500 AM CDT for
northeastern and east central Kansas...and west central Missouri.

Remember, a Severe Thunderstorm Warning still remains in effect for 
northern Clay County until 315 am. 


LAT...LON 3898 9506 3897 9504 3900 9502 3898 9497
      3900 9493 3898 9492 3899 9491 3920 9490
      3921 9478 3922 9483 3926 9483 3931 9490
      3930 9443 3902 9447 3874 9478 3875 9506
TIME...MOT...LOC 0758Z 277DEG 47KT 3933 9444 3907 9464 3887 9524 

$$

Leighton

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 9, 8:01 PM CDT	Special Weather Statement	EAX	Schuyler	44 min
Jul 9, 8:10 PM CDT	Severe Thunderstorm Warning	EAX	Adair, Schuyler	35 min
Jul 9, 8:37 PM CDT	Special Weather Statement	EAX	Grundy	38 min
Jul 9, 8:44 PM CDT	Severe Thunderstorm Warning	EAX	Adair, Schuyler	46 min
Jul 9, 8:50 PM CDT	Special Weather Statement	EAX	Putnam, Schuyler	40 min
Jul 9, 9:18 PM CDT	Special Weather Statement	EAX	Linn	42 min
Jul 9, 9:23 PM CDT	Severe Thunderstorm Warning	EAX	Adair, Macon	52 min
Jul 9, 9:26 PM CDT	Special Weather Statement	EAX	Adair	49 min
Jul 9, 9:36 PM CDT	Tornado Warning	EAX	Adair, Macon	12 min
Jul 9, 10:07 PM CDT	Severe Thunderstorm Warning	EAX	Adair, Macon	38 min
Jul 9, 10:44 PM CDT	Special Weather Statement	EAX	Linn, Macon, Randolph, Sullivan	46 min
Jul 9, 10:51 PM CDT	Special Weather Statement	EAX	Harrison	39 min
Jul 9, 11:28 PM CDT	Special Weather Statement	EAX	Linn, Randolph	47 min
Jul 10, 12:04 AM CDT	Severe Thunderstorm Warning	EAX	Chariton, Howard, Macon, Randolph	41 min
Jul 10, 12:53 AM CDT	Severe Thunderstorm Warning	EAX	Atchison, Holt, Nodaway, Worth	52 min
Jul 10, 1:37 AM CDT	Flash Flood Warning	EAX	Adair, Sullivan	8 hr
Jul 10, 1:40 AM CDT	Severe Thunderstorm Warning	EAX	Andrew, Atchison, DeKalb, Gentry, Holt, Nodaway and 1 more	50 min
Jul 10, 1:44 AM CDT	Severe Thunderstorm Warning	EAX	Buchanan, Clinton, DeKalb, Platte	46 min
Jul 10, 2:28 AM CDT	Severe Thunderstorm Warning	EAX	Buchanan, Caldwell, Clay, Clinton, Daviess, DeKalb and 2 more	47 min
Jul 10, 2:32 AM CDT	Severe Thunderstorm Warning	EAX	Andrew, Daviess, DeKalb, Gentry, Harrison, Nodaway and 1 more	43 min
Jul 10, 2:35 AM CDT	Flash Flood Warning	EAX	Linn, Macon	7 hr
Jul 10, 2:51 AM CDT	Special Weather Statement	EAX	Cass, Jackson, Johnson, Lafayette	39 min
Jul 10, 3:11 AM CDT	Special Weather Statement	EAX	Caldwell, Carroll, Daviess, Grundy, Harrison, Livingston and 2 more	49 min
Jul 10, 3:32 AM CDT	Special Weather Statement	EAX	Cass, Johnson, Lafayette, Pettis, Saline	43 min
Jul 10, 5:30 AM CDT	River Flood Warning	EAX	Chariton, Macon	3 days
Jul 10, 5:30 AM CDT	River Flood Warning	EAX	Carroll, Chariton, Linn, Livingston	5 days
Jul 10, 5:30 AM CDT	River Flood Warning	EAX	Cass, Henry, Johnson	2 hr
Jul 10, 7:46 AM CDT	River Flood Warning	EAX	Howard	13 hr
Jul 10, 8:27 AM CDT	Special Weather Statement	EAX	Bates	48 min
Jul 10, 8:47 AM CDT	Flash Flood Warning	EAX	Bates, Cass	3 hr
Jul 10, 9:45 AM CDT	Areal Flood Advisory	EAX	Adair, Linn, Macon, Sullivan	4 days
Jul 10, 3:47 PM CDT	Special Weather Statement	EAX	Atchison	43 min
Jul 10, 5:07 PM CDT	Special Weather Statement	EAX	Holt	38 min
Jul 10, 6:06 PM CDT	Special Weather Statement	EAX	Buchanan, Clinton, Daviess, DeKalb, Gentry	39 min
Jul 10, 6:18 PM CDT	Severe Thunderstorm Warning	EAX	Buchanan, Clay, Clinton, Platte	27 min
Jul 10, 6:25 PM CDT	Special Weather Statement	EAX	Jackson	50 min
Jul 10, 6:47 PM CDT	Special Weather Statement	EAX	Clay, Clinton, Platte	43 min
Jul 10, 5:45 PM CDT	Special Weather Statement	EAX	Wyandotte	45 min
Jul 10, 6:39 PM CDT	Special Weather Statement	EAX	Leavenworth	51 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.