Alert archive / Missouri / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 23, NWS Kansas City, MO

June 11, 20216 counties in Missouri

NWS Kansas City, MO issued this severe thunderstorm warning at Jun 11, 2021, 2:44 PM CDT for 6 counties in Missouri. It was in force for 46 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: Jun 11, 2021, 2:44 PM CDT (19:44 UTC)
Expired: Jun 11, 2021, 3:30 PM CDT
In force: 46 min
Issued by: NWS Kansas City, MO
Area: Storm-based polygon
Hail: 2.0 in
Wind: 70.0 mph

Counties Andrew County, MO, Buchanan County, MO, Clay County, MO, Clinton County, MO, DeKalb County, MO, Platte County, MO

The radar

The Pleasant Hill radar (KEAX), 108 km from the middle of the area, began a volume at 19:48 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, 3:00 PM CDT	TSTM WND DMG	Gower, MO	POWER POLES DOWN IN GOWER, MO AND ON J HWY AT MIDDLE ROAD.
Jun 11, 3:23 PM CDT	TSTM WND GST 75	4 E Plattsburg, MO	SEVERAL LARGE OAK TREE LIMBS DOWN. OWNER ESTIMATED 70 TO 80 MPH.
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.

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, 8:30 AM CDT	Severe Thunderstorm Watch	SPC	7 hr
Jun 11, 12:32 PM CDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Topeka, KS (KTOP), launched 12:00Z, 7.7 hours before the alert went out and 138 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.

254 
WUUS53 KEAX 111944
SVREAX
MOC003-021-047-049-063-165-112030-
/O.NEW.KEAX.SV.W.0023.210611T1944Z-210611T2030Z/

BULLETIN - EAS ACTIVATION REQUESTED
Severe Thunderstorm Warning
National Weather Service Kansas City/Pleasant Hill MO
244 PM CDT Fri Jun 11 2021

The National Weather Service in Pleasant Hill has issued a

* Severe Thunderstorm Warning for...
  Eastern Buchanan County in northwestern Missouri...
  Northeastern Clay County in west central Missouri...
  Clinton County in northwestern Missouri...
  Northeastern Platte County in west central Missouri...
  Southeastern Andrew County in northwestern Missouri...
  DeKalb County in northwestern Missouri...

* Until 330 PM CDT.

* At 243 PM CDT, a severe thunderstorm was located near Clarksdale,
  or 9 miles north of Gower, moving southeast at 35 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.

* This severe thunderstorm will be near...
  Stewartsville around 250 PM CDT.
  Gower around 255 PM CDT.
  Osborn around 300 PM CDT.

Other locations in the path of this severe thunderstorm include
Plattsburg, Lathrop and Lawson.

This includes Interstate 35 in Missouri between mile markers 32 and
56.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3997 9420 3943 9421 3949 9474 4004 9458
TIME...MOT...LOC 1943Z 303DEG 32KT 3975 9461 

HAIL...2.00IN
WIND...70MPH
 
$$

PP

1 follow-up statement

281 
WWUS53 KEAX 112016
SVSEAX

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

MOC003-112026-
/O.CAN.KEAX.SV.W.0023.000000T0000Z-210611T2030Z/
Andrew MO-
316 PM CDT Fri Jun 11 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN ANDREW COUNTY 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 500 PM CDT for
northwestern Missouri. A Severe Thunderstorm Watch also remains in
effect until 700 PM CDT for north central, northwestern and west
central Missouri.

LAT...LON 3943 9421 3949 9474 3980 9465 3977 9420
TIME...MOT...LOC 2016Z 303DEG 32KT 3959 9428 

$$

MOC021-047-049-063-165-112030-
/O.CON.KEAX.SV.W.0023.000000T0000Z-210611T2030Z/
Buchanan MO-Clay MO-Clinton MO-Platte MO-DeKalb MO-
316 PM CDT Fri Jun 11 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 330 PM CDT
FOR SOUTHEASTERN BUCHANAN...NORTHEASTERN CLAY...CLINTON...
NORTHEASTERN PLATTE AND SOUTHERN DEKALB COUNTIES...

At 316 PM CDT, a severe thunderstorm was located near Lathrop, moving
southeast at 35 mph.

HAZARD...70 mph wind gusts and ping pong ball size hail.

SOURCE...Radar indicated.

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...
  Lawson.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3943 9421 3949 9474 3980 9465 3977 9420
TIME...MOT...LOC 2016Z 303DEG 32KT 3959 9428 

HAIL...1.50IN
WIND...70MPH
 
$$

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, 2:49 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, 3:26 PM CDT	Severe Thunderstorm Warning	EAX	Caldwell, Clay, Clinton, Jackson, Ray	34 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.