Alert archive / Missouri / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 26, NWS Kansas City, MO

June 11, 20215 counties in Missouri

NWS Kansas City, MO issued this severe thunderstorm warning at Jun 11, 2021, 3:26 PM CDT for 5 counties in Missouri. It was in force for 34 min. 9 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: Jun 11, 2021, 3:26 PM CDT (20:26 UTC)
Expired: Jun 11, 2021, 4:00 PM CDT
In force: 34 min
Issued by: NWS Kansas City, MO
Area: Storm-based polygon
Hail: 1.0 in
Wind: 70.0 mph

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

The radar

The Pleasant Hill radar (KEAX), 69 km from the middle of the area, began a volume at 20:28 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
Jun 11, 3:30 PM CDT	TSTM WND DMG	1 N Excelsior Springs, MO	UP TO 100 TREES DOWN FROM STRAIGHT-LINE WINDS, TREE DIAMETER RANGING FROM 2-3 INCHES TO 3 FEET. DAMAGE TO SIDING, FENCING, WITH CARS REPORTED DAMAGED FROM TREE DEBRIS.
Jun 11, 3:30 PM CDT	TSTM WND DMG	1 Wnw Excelsior Springs, MO	POWER POLE SNAPPED, 1.5 FOOT TREES DOWN. POWER OUT ON WEST SIDE OF EXCELSIOR SPRINGS, MO.
Jun 11, 3:30 PM CDT	TSTM WND DMG	3 W Excelsior Estates, MO	DELAYED REPORT. AT WATKINS MILL STATE PARK THERE WERE APPROXIMATELY 25 TO 30 TREES DOWN ACROSS THE CAMPGROUND WITH TREES ON TOP OF CARS AND CAMPERS. AS OF THE REPORT TIME, THERE WERE NO INJURIES.
Jun 11, 3:30 PM CDT	TSTM WND DMG	Excelsior Springs, MO	40-60 TREES DOWN, BOTH HEALTHY AND DEAD TREES. 2 FOOT DIAMETER TREES DOWN. A FEW HOUSES HAVE FALLEN TREES ON THEM, POWER LINES DOWN.
Jun 11, 3:30 PM CDT	TSTM WND DMG	Lathrop, MO	DELAYED REPORT. 10 INCH TREE LIMB DOWN IN LATHROP.
Jun 11, 3:30 PM CDT	TSTM WND GST 65	Holt, MO	WINDS KNOCKED DOWN STREET LAMPS, SEVERAL 2-2.5 INCH TREE BRANCHES ON ROADWAYS. SPORADIC PEA-SIZED HAIL REPORTED.
Jun 11, 3:38 PM CDT	TSTM WND DMG	Excelsior Springs, MO	DELAYED REPORT. TWO FOOT DIAMETER TREE UPROOTED.
Jun 11, 3:45 PM CDT	TSTM WND DMG	1 W Woods Heights, MO	DELAYED REPORT. ONE FOOT DIAMETER TREE UPROOTED, WITH SEVERAL LARGE LIMBS ALSO BROKEN.
Jun 11, 4:00 PM CDT	TSTM WND GST 62	Mosby, MO

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
Jun 11, 12:32 PM CDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Topeka, KS (KTOP), launched 12:00Z, 8.4 hours before the alert went out and 124 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: 2135 J/kg
Mixed-layer CIN: -160 J/kg
Mixed-layer LCL: 1019 m above ground
0-6 km bulk shear: 23 kt
0-1 km storm-relative helicity: 3 m²/s²
0-3 km storm-relative helicity: 72 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -1.2

Open this sounding in Storm Lab

The text

As transmitted.

143 
WUUS53 KEAX 112026
SVREAX
MOC025-047-049-095-177-112100-
/O.NEW.KEAX.SV.W.0026.210611T2026Z-210611T2100Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Kansas City/Pleasant Hill MO
326 PM CDT Fri Jun 11 2021

The National Weather Service in Pleasant Hill has issued a

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

* Until 400 PM CDT.

* At 326 PM CDT, a severe thunderstorm was located near Lathrop,
  moving southeast at 35 mph.

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

  SOURCE...Radar indicated.

  IMPACT...Hail damage to vehicles is expected. Expect considerable 
           tree damage. Wind damage is also likely to mobile homes, 
           roofs, and outbuildings.

* This severe thunderstorm will be near...
  Holt around 330 PM CDT.
  Lawson and Excelsior Estates around 340 PM CDT.
  Excelsior Springs and Crystal Lakes around 345 PM CDT.

Other locations in the path of this severe thunderstorm include Woods
Heights, Missouri City, Orrick and Sibley.

This includes Interstate 35 in Missouri between mile markers 28 and
45.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3962 9449 3964 9418 3935 9404 3918 9415
      3921 9437 3937 9426 3944 9452
TIME...MOT...LOC 2026Z 332DEG 32KT 3950 9434 

HAIL...1.00IN
WIND...70MPH
 
$$

PP

2 follow-up statements

158 
WWUS53 KEAX 112033
SVSEAX

Severe Weather Statement
National Weather Service Kansas City/Pleasant Hill MO
333 PM CDT Fri Jun 11 2021

MOC025-047-049-095-177-112100-
/O.CON.KEAX.SV.W.0026.000000T0000Z-210611T2100Z/
Clay MO-Clinton MO-Ray MO-Caldwell MO-Jackson MO-
333 PM CDT Fri Jun 11 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 400 PM CDT
FOR NORTHEASTERN CLAY...SOUTHEASTERN CLINTON...WESTERN RAY...
SOUTHWESTERN CALDWELL AND NORTH CENTRAL JACKSON COUNTIES...

At 333 PM CDT, a severe thunderstorm was located over Holt, or near
Lawson, moving southeast at 35 mph.

This is a very dangerous storm.

HAZARD...80 mph wind gusts and quarter size hail.

SOURCE...Trained weather spotters.

IMPACT...Flying debris will be dangerous to those caught without 
         shelter. Mobile homes will be heavily damaged. Expect 
         considerable damage to roofs, windows, and vehicles. 
         Extensive tree damage and power outages are likely.

This severe storm will be near...
  Excelsior Estates around 340 PM CDT.
  Excelsior Springs and Crystal Lakes around 345 PM CDT.

Other locations in the path of this severe thunderstorm include Woods
Heights, Missouri City, Orrick and Sibley.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3962 9449 3964 9418 3935 9404 3918 9415
      3921 9437 3937 9426 3944 9452
TIME...MOT...LOC 2033Z 332DEG 32KT 3944 9430 

HAIL...1.00IN
WIND...80MPH
 
$$

PP

046 
WWUS53 KEAX 112044
SVSEAX

Severe Weather Statement
National Weather Service Kansas City/Pleasant Hill MO
344 PM CDT Fri Jun 11 2021

MOC025-047-049-095-177-112100-
/O.CON.KEAX.SV.W.0026.000000T0000Z-210611T2100Z/
Clay MO-Clinton MO-Ray MO-Caldwell MO-Jackson MO-
344 PM CDT Fri Jun 11 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 400 PM CDT
FOR NORTHEASTERN CLAY...SOUTHEASTERN CLINTON...WESTERN RAY...
SOUTHWESTERN CALDWELL AND NORTH CENTRAL JACKSON COUNTIES...

At 344 PM CDT, a severe thunderstorm was located over Excelsior
Springs, moving southeast at 35 mph.

This is a very dangerous storm.

HAZARD...80 mph wind gusts and quarter size hail.

SOURCE...Radar indicated.

IMPACT...Flying debris will be dangerous to those caught without 
         shelter. Mobile homes will be heavily damaged. Expect 
         considerable damage to roofs, windows, and vehicles. 
         Extensive tree damage and power outages are likely.

Locations impacted include...
  Missouri City, Orrick and Sibley.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3951 9434 3958 9415 3935 9404 3918 9415
      3921 9437 3937 9426 3944 9452
TIME...MOT...LOC 2044Z 332DEG 32KT 3935 9424 

HAIL...1.00IN
WIND...80MPH
 
$$

PP

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 11, 12:04 PM CDT	Special Weather Statement	EAX	Atchison	41 min
Jun 11, 12:10 PM CDT	Severe Thunderstorm Warning	EAX	Atchison, Holt	21 min
Jun 11, 1:16 PM CDT	Severe Thunderstorm Warning	EAX	Holt	29 min
Jun 11, 1:41 PM CDT	Severe Thunderstorm Warning	EAX	Andrew, Buchanan, Holt	34 min
Jun 11, 2:12 PM CDT	Severe Thunderstorm Warning	EAX	Andrew, Buchanan, DeKalb, Holt, Platte	63 min
Jun 11, 2:44 PM CDT	Severe Thunderstorm Warning	EAX	Andrew, Buchanan, Clay, Clinton, DeKalb, Platte	46 min
Jun 11, 2:49 PM CDT	Severe Thunderstorm Warning	EAX	Carroll, Lafayette, Ray	41 min
Jun 11, 2:52 PM CDT	Severe Thunderstorm Warning	EAX	Clay, Clinton, Jackson, Platte	68 min
Jun 11, 3:28 PM CDT	Special Weather Statement	EAX	Lafayette	47 min
Jun 11, 3:37 PM CDT	Severe Thunderstorm Warning	EAX	Cass, Clay, Jackson, Lafayette, Ray	38 min
Jun 11, 3:57 PM CDT	Severe Thunderstorm Warning	EAX	Clay, Clinton, Jackson, Ray	14 min
Jun 11, 3:59 PM CDT	Severe Thunderstorm Warning	EAX	Cass, Clay, Jackson	31 min
Jun 11, 4:02 PM CDT	Areal Flood Advisory	EAX	Platte	4 hr
Jun 11, 4:07 PM CDT	Special Weather Statement	EAX	Pettis	38 min
Jun 11, 4:14 PM CDT	Severe Thunderstorm Warning	EAX	Cass, Clay, Jackson, Johnson, Lafayette, Ray	46 min
Jun 11, 4:25 PM CDT	Severe Thunderstorm Warning	EAX	Johnson, Lafayette, Pettis, Saline	35 min
Jun 11, 4:42 PM CDT	Severe Thunderstorm Warning	EAX	Bates, Cass, Henry, Johnson, Pettis	33 min
Jun 11, 5:08 PM CDT	Severe Thunderstorm Warning	EAX	Henry, Johnson, Lafayette, Pettis, Saline	37 min
Jun 11, 5:58 PM CDT	River Flood Warning	EAX	Jackson	81 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.