Alert archive / Missouri / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 46, NWS Kansas City, MO

June 20, 2021Clay County, Clinton County, Platte County, Missouri

NWS Kansas City, MO issued this severe thunderstorm warning at Jun 20, 2021, 7:57 PM CDT for Clay County, Clinton County, Platte County, Missouri. It was in force for 33 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: Jun 20, 2021, 7:57 PM CDT (00:57 UTC)
Expired: Jun 20, 2021, 8:30 PM CDT
In force: 33 min
Issued by: NWS Kansas City, MO
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Clay County, MO, Clinton County, MO, Platte County, MO

The radar

The Pleasant Hill radar (KEAX), 80 km from the middle of the area, began a volume at 00:57 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 20, 8:03 PM CDT	HAIL 0.75	3 S Plattsburg, 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 20, 4:01 PM CDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Topeka, KS (KTOP), launched 00:00Z, 1.0 hours before the alert went out and 118 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: 2316 J/kg
Mixed-layer CIN: -6 J/kg
Mixed-layer LCL: 2228 m above ground
0-6 km bulk shear: 38 kt
0-1 km storm-relative helicity: 50 m²/s²
0-3 km storm-relative helicity: 150 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 8.8

Open this sounding in Storm Lab

The text

As transmitted.

136 
WUUS53 KEAX 210057
SVREAX
MOC047-049-165-210130-
/O.NEW.KEAX.SV.W.0046.210621T0057Z-210621T0130Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Kansas City/Pleasant Hill MO
757 PM CDT Sun Jun 20 2021

The National Weather Service in Pleasant Hill has issued a

* Severe Thunderstorm Warning for...
  Northern Clay County in west central Missouri...
  Southern Clinton County in northwestern Missouri...
  Eastern Platte County in west central Missouri...

* Until 830 PM CDT.

* At 757 PM CDT, a severe thunderstorm was located over Edgerton, or
  7 miles south of Gower, moving east at 30 mph.

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

  SOURCE...Radar indicated.

  IMPACT...Hail damage to vehicles is expected. Expect wind damage 
           to roofs, siding, and trees.

* This severe thunderstorm will be near...
  Trimble around 800 PM CDT.
  Plattsburg around 810 PM CDT.

Other locations in the path of this severe thunderstorm include
Lathrop, Holt, Kearney, Excelsior Springs, Lawson and Excelsior
Estates.

This includes Interstate 35 in Missouri between mile markers 26 and
43.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3960 9454 3960 9421 3934 9421 3943 9471
TIME...MOT...LOC 0057Z 286DEG 27KT 3951 9459 

HAIL...1.00IN
WIND...60MPH
 
$$

Blair

2 follow-up statements

698 
WWUS53 KEAX 210105
SVSEAX

Severe Weather Statement
National Weather Service Kansas City/Pleasant Hill MO
805 PM CDT Sun Jun 20 2021

MOC165-210115-
/O.CAN.KEAX.SV.W.0046.000000T0000Z-210621T0130Z/
Platte MO-
805 PM CDT Sun Jun 20 2021

...THE SEVERE THUNDERSTORM WARNING FOR EASTERN PLATTE 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 1100 PM CDT for
northwestern and west central Missouri.

LAT...LON 3954 9460 3958 9453 3960 9421 3934 9421
      3941 9460
TIME...MOT...LOC 0105Z 286DEG 27KT 3949 9451 

$$

MOC047-049-210130-
/O.CON.KEAX.SV.W.0046.000000T0000Z-210621T0130Z/
Clay MO-Clinton MO-
805 PM CDT Sun Jun 20 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 830 PM CDT
FOR NORTHERN CLAY AND SOUTHERN CLINTON COUNTIES...

At 805 PM CDT, a severe thunderstorm was located over Trimble, or
near Plattsburg, moving east at 30 mph.

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

SOURCE...Radar indicated.

IMPACT...Hail damage to vehicles is expected. Expect wind damage to 
         roofs, siding, and trees.

Locations impacted include...
  Lathrop, Kearney, Holt, Excelsior Springs, Lawson and Excelsior 
  Estates.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3954 9460 3958 9453 3960 9421 3934 9421
      3941 9460
TIME...MOT...LOC 0105Z 286DEG 27KT 3949 9451 

HAIL...1.00IN
WIND...60MPH
 
$$

Blair

681 
WWUS53 KEAX 210121
SVSEAX

Severe Weather Statement
National Weather Service Kansas City/Pleasant Hill MO
821 PM CDT Sun Jun 20 2021

MOC047-049-210131-
/O.EXP.KEAX.SV.W.0046.000000T0000Z-210621T0130Z/
Clay MO-Clinton MO-
821 PM CDT Sun Jun 20 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHERN CLAY AND SOUTHERN
CLINTON COUNTIES WILL EXPIRE AT 830 PM 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.

A Severe Thunderstorm Watch remains in effect until 1100 PM CDT for
northwestern and west central Missouri.

LAT...LON 3954 9460 3958 9453 3960 9421 3934 9421
      3941 9460
TIME...MOT...LOC 0121Z 286DEG 27KT 3946 9438 

$$

Blair

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 20, 7:15 PM CDT	Severe Thunderstorm Warning	EAX	Grundy, Harrison, Mercer, Putnam, Sullivan	45 min
Jun 20, 8:01 PM CDT	Severe Thunderstorm Warning	EAX	Adair, Linn, Macon, Sullivan	44 min
Jun 20, 8:39 PM CDT	Severe Thunderstorm Warning	EAX	Adair, Macon	36 min
Jun 20, 8:54 PM CDT	Special Weather Statement	EAX	Livingston	21 min
Jun 20, 9:17 PM CDT	Special Weather Statement	EAX	Jackson	28 min
Jun 20, 9:29 PM CDT	Severe Thunderstorm Warning	EAX	Cass, Jackson, Johnson	20 min
Jun 20, 10:27 PM CDT	Severe Thunderstorm Warning	EAX	Cooper, Howard	33 min
Jun 20, 11:05 PM CDT	Special Weather Statement	EAX	Bates	25 min
Jun 21, 5:19 AM CDT	River Flood Warning	EAX	Howard	9 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.