Alert archive / Missouri / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 12, NWS Kansas City, MO

May 8, 20215 counties in Missouri

NWS Kansas City, MO issued this severe thunderstorm warning at May 8, 2021, 11:55 PM CDT for 5 counties in Missouri. It was in force for 35 min. 3 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: May 8, 2021, 11:55 PM CDT (04:55 UTC)
Expired: May 9, 2021, 12:30 AM CDT
In force: 35 min
Issued by: NWS Kansas City, MO
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Caldwell County, MO, Clay County, MO, Clinton County, MO, Jackson County, MO, Ray County, MO

The radar

The Pleasant Hill radar (KEAX), 49 km from the middle of the area, began a volume at 04:58 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
May 8, 11:57 PM CDT	TSTM WND GST 60	2 Ssw Trimble, MO	REPORTED NEAR THE INTERSECTION OF HIGHWAY 169 AND STATE ROUTE W.
May 8, 11:58 PM CDT	TSTM WND DMG	6 Se Smithville, MO	TREE DOWNED. TIME ESTIMATED FROM RADAR.
May 9, 12:15 AM CDT	TSTM WND DMG	3 W Excelsior Estates, MO	A COUPLE TREES DOWNED IN WATKINS WOOLEN MILL STATE PARK. TIME ESTIMATED FROM RADAR.

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
May 8, 9:51 PM CDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Topeka, KS (KTOP), launched 00:00Z, 4.9 hours before the alert went out and 114 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: 377 J/kg
Mixed-layer CIN: -170 J/kg
Mixed-layer LCL: 1653 m above ground
0-6 km bulk shear: 39 kt
0-1 km storm-relative helicity: 106 m²/s²
0-3 km storm-relative helicity: 362 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 6.0

Open this sounding in Storm Lab

The text

As transmitted.

225 
WUUS53 KEAX 090455
SVREAX
MOC025-047-049-095-177-090530-
/O.NEW.KEAX.SV.W.0012.210509T0455Z-210509T0530Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Kansas City/Pleasant Hill MO
1155 PM CDT Sat May 8 2021

The National Weather Service in Pleasant Hill has issued a

* Severe Thunderstorm Warning for...
  Clay County in west central Missouri...
  Clinton County in northwestern Missouri...
  Western Ray County in west central Missouri...
  Southwestern Caldwell County in north central Missouri...
  Northern Jackson County in west central Missouri...

* Until 1230 AM CDT.

* At 1154 PM CDT, a severe thunderstorm was located over Smithville,
  moving east at 55 mph.

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

  SOURCE...Radar indicated.

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

* Locations impacted include...
  Kansas City, Independence, Blue Springs, Liberty, Gladstone,
  Excelsior Springs, Smithville, Kearney, North Kansas City, Sugar
  Creek, Buckner, Lawson, Plattsburg, Lathrop, Gower, Claycomo,
  Courtney, Pleasant Valley, Orrick and Trimble.

This includes the following highways...
 Interstate 70 in Missouri between mile markers 1 and 8.
 Interstate 35 in Missouri between mile markers 0 and 47.
 Interstate 35 in Kansas near mile marker 235.
 Interstate 29 between mile markers 0 and 2.
 Interstate 435 between mile markers 40 and 62.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3914 9459 3916 9460 3963 9460 3967 9407
      3943 9394 3913 9407 3914 9411 3904 9411
      3906 9461 3912 9461
TIME...MOT...LOC 0454Z 267DEG 46KT 3936 9458 

HAIL...0.75IN
WIND...60MPH
 
$$

Blair

3 follow-up statements

462 
WWUS53 KEAX 090512
SVSEAX

Severe Weather Statement
National Weather Service Kansas City/Pleasant Hill MO
1212 AM CDT Sun May 9 2021

MOC025-047-049-095-177-090530-
/O.CON.KEAX.SV.W.0012.000000T0000Z-210509T0530Z/
Clay MO-Clinton MO-Ray MO-Caldwell MO-Jackson MO-
1212 AM CDT Sun May 9 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1230 AM CDT
FOR CLAY...SOUTHEASTERN CLINTON...WESTERN RAY...SOUTHWESTERN CALDWELL
AND NORTHERN JACKSON COUNTIES...

At 1211 AM CDT, a severe thunderstorm was located near Excelsior
Springs, moving east at 55 mph.

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

SOURCE...Radar indicated.

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

Locations impacted include...
Kansas City, Independence, Blue Springs, Liberty, Gladstone,
Excelsior Springs, Kearney, North Kansas City, Sugar Creek, Buckner,
Lawson, Plattsburg, Lathrop, Claycomo, Courtney, Pleasant Valley,
Orrick, Polo, Glenaire and Holt.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3924 9460 3939 9447 3964 9446 3967 9407
      3943 9394 3913 9407 3914 9411 3904 9411
      3906 9461 3912 9461 3914 9459 3916 9460
TIME...MOT...LOC 0511Z 267DEG 46KT 3937 9429 

HAIL...0.75IN
WIND...60MPH
 
$$

Blair

562 
WWUS53 KEAX 090519
SVSEAX

Severe Weather Statement
National Weather Service Kansas City/Pleasant Hill MO
1219 AM CDT Sun May 9 2021

MOC025-047-049-095-177-090530-
/O.CON.KEAX.SV.W.0012.000000T0000Z-210509T0530Z/
Clay MO-Clinton MO-Ray MO-Caldwell MO-Jackson MO-
1219 AM CDT Sun May 9 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1230 AM CDT
FOR CENTRAL CLAY...SOUTHEASTERN CLINTON...WESTERN RAY...SOUTHWESTERN
CALDWELL AND NORTHERN JACKSON COUNTIES...

At 1219 AM CDT, a severe thunderstorm was located over Crystal Lakes,
or near Excelsior Springs, moving east at 55 mph.

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

SOURCE...Radar indicated.

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

Locations impacted include...
Kansas City, Independence, Blue Springs, Liberty, Gladstone,
Excelsior Springs, Kearney, North Kansas City, Sugar Creek, Buckner,
Lawson, Lathrop, Claycomo, Courtney, Pleasant Valley, Orrick, Polo,
Glenaire, Holt and Avondale.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3932 9438 3965 9433 3967 9407 3943 9394
      3913 9407 3914 9411 3904 9411 3906 9461
      3912 9461 3914 9459 3916 9460
TIME...MOT...LOC 0519Z 267DEG 46KT 3938 9417 

HAIL...0.75IN
WIND...60MPH
 
$$

Blair

311 
WWUS53 KEAX 090523
SVSEAX

Severe Weather Statement
National Weather Service Kansas City/Pleasant Hill MO
1223 AM CDT Sun May 9 2021

MOC025-047-049-095-177-090533-
/O.EXP.KEAX.SV.W.0012.000000T0000Z-210509T0530Z/
Clay MO-Clinton MO-Ray MO-Caldwell MO-Jackson MO-
1223 AM CDT Sun May 9 2021

...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL CLAY...SOUTHEASTERN
CLINTON...WESTERN RAY...SOUTHWESTERN CALDWELL AND NORTHERN JACKSON
COUNTIES WILL EXPIRE AT 1230 AM CDT...
                
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning will be allowed to expire.  However gusty
winds up tp 50 mph are still possible with this thunderstorm.

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

LAT...LON 3932 9438 3965 9433 3967 9407 3943 9394
      3913 9407 3914 9411 3904 9411 3906 9461
      3912 9461 3914 9459 3916 9460
TIME...MOT...LOC 0523Z 267DEG 46KT 3938 9412 

$$

Blair

The office that day

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

Issued	Product	Office	Counties	Lasted
May 8, 11:19 PM CDT	Severe Thunderstorm Warning	EAX	Buchanan, Platte	41 min
May 9, 12:29 AM CDT	Special Weather Statement	EAX	Carroll, Lafayette, Ray	31 min
May 9, 1:00 AM CDT	Special Weather Statement	EAX	Cass, Johnson	45 min
May 9, 1:27 AM CDT	Severe Thunderstorm Warning	EAX	Cass, Henry, Johnson	33 min
May 9, 1:37 AM CDT	Special Weather Statement	EAX	Johnson, Pettis	38 min
May 9, 1:43 AM CDT	Special Weather Statement	EAX	Cooper, Howard, Randolph, Saline	47 min
May 9, 2:11 AM CDT	Special Weather Statement	EAX	Pettis	34 min
May 9, 5:09 AM CDT	Special Weather Statement	EAX	Cass, Clay, Jackson, Johnson, Lafayette, Platte and 1 more	51 min
May 9, 1:25 PM CDT	River Flood Warning	EAX	Johnson, Pettis	10 hr
May 9, 1:25 PM CDT	River Flood Warning	EAX	Cooper, Saline	25 hr

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.