Alert archive / Missouri / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 113, NWS Kansas City, MO

August 12, 2021Cass County, Jackson County, Johnson County, Missouri

NWS Kansas City, MO issued this severe thunderstorm warning at Aug 12, 2021, 5:37 PM CDT for Cass County, Jackson County, Johnson County, Missouri. It was in force for 8 min. 2 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: Aug 12, 2021, 5:37 PM CDT (22:37 UTC)
Expired: Aug 12, 2021, 5:45 PM CDT
In force: 8 min
Issued by: NWS Kansas City, MO
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Cass County, MO, Jackson County, MO, Johnson County, MO

The radar

The Pleasant Hill radar (KEAX), 11 km from the middle of the area, began a volume at 22:38 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
Aug 12, 5:50 PM CDT	TSTM WND DMG	4 W Pleasant Hill, MO	TREE DOWNED AND BLOCKING HIGHWAY 58 AT GRAY ROAD
Aug 12, 5:52 PM CDT	TSTM WND GST 60	1 Sw Raymore, 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
Aug 12, 5:19 PM CDT	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

Topeka, KS (KTOP), launched 12:00Z, 10.6 hours before the alert went out and 111 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: 951 J/kg
Mixed-layer CIN: -437 J/kg
Mixed-layer LCL: 1729 m above ground
0-6 km bulk shear: 3 kt
0-1 km storm-relative helicity: 141 m²/s²
0-3 km storm-relative helicity: 228 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.9

Open this sounding in Storm Lab

The text

As transmitted.

312 
WUUS53 KEAX 122237
SVREAX
MOC037-095-101-122245-
/O.NEW.KEAX.SV.W.0113.210812T2237Z-210812T2245Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Kansas City/Pleasant Hill MO
537 PM CDT Thu Aug 12 2021

The National Weather Service in Pleasant Hill has issued a

* Severe Thunderstorm Warning for...
  Northern Cass County in west central Missouri...
  Southern Jackson County in west central Missouri...
  West central Johnson County in west central Missouri...

* Until 545 PM CDT.

* At 537 PM CDT, a severe thunderstorm was located over Greenwood,
  moving southeast at 25 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...
  Lee's Summit, Grandview, Belton, Raymore, Harrisonville, Pleasant
  Hill, Greenwood, Peculiar, Lake Lotawana, Lake Winnebago, Lone
  Jack, Baldwin Park and Strasburg.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3863 9443 3882 9461 3887 9461 3896 9422
      3877 9401
TIME...MOT...LOC 2237Z 313DEG 22KT 3886 9438 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

HB

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 12, 4:29 AM CDT	Special Weather Statement	EAX	Harrison	31 min
Aug 12, 4:58 AM CDT	Special Weather Statement	EAX	Mercer	47 min
Aug 12, 5:31 AM CDT	Severe Thunderstorm Warning	EAX	Harrison, Mercer	29 min
Aug 12, 6:00 AM CDT	Special Weather Statement	EAX	Mercer	30 min
Aug 12, 8:37 AM CDT	Special Weather Statement	EAX	Schuyler	8 min
Aug 12, 8:38 AM CDT	Special Weather Statement	EAX	Schuyler	37 min
Aug 12, 1:27 PM CDT	Flash Flood Watch	EAX	Putnam, Schuyler	6 hr
Aug 12, 1:42 PM CDT	Special Weather Statement	EAX	Daviess, Grundy, Sullivan	48 min
Aug 12, 1:45 PM CDT	Special Weather Statement	EAX	Schuyler	30 min
Aug 12, 2:15 PM CDT	Flash Flood Warning	EAX	Putnam, Schuyler	2 hr
Aug 12, 2:16 PM CDT	Special Weather Statement	EAX	Caldwell, Linn, Livingston	29 min
Aug 12, 2:18 PM CDT	Severe Thunderstorm Warning	EAX	Grundy, Linn, Livingston	27 min
Aug 12, 2:31 PM CDT	Severe Thunderstorm Warning	EAX	Caldwell, Carroll, Daviess, Linn, Livingston	29 min
Aug 12, 2:49 PM CDT	Severe Thunderstorm Warning	EAX	Carroll, Chariton, Livingston	26 min
Aug 12, 3:13 PM CDT	Severe Thunderstorm Warning	EAX	Carroll, Chariton, Livingston, Saline	32 min
Aug 12, 3:28 PM CDT	Severe Thunderstorm Warning	EAX	Clay, Platte	32 min
Aug 12, 3:44 PM CDT	Severe Thunderstorm Warning	EAX	Chariton, Macon, Randolph	31 min
Aug 12, 3:53 PM CDT	Severe Thunderstorm Warning	EAX	Randolph	37 min
Aug 12, 3:56 PM CDT	Severe Thunderstorm Warning	EAX	Clay, Jackson, Platte	34 min
Aug 12, 4:09 PM CDT	Severe Thunderstorm Warning	EAX	Clay, Jackson, Lafayette, Ray, Saline	36 min
Aug 12, 4:42 PM CDT	Severe Thunderstorm Warning	EAX	Jackson, Johnson, Lafayette	33 min
Aug 12, 5:11 PM CDT	Severe Thunderstorm Warning	EAX	Cass, Jackson, Johnson, Lafayette	34 min
Aug 12, 5:18 PM CDT	Severe Thunderstorm Warning	EAX	Cass, Jackson	27 min
Aug 12, 5:22 PM CDT	Severe Thunderstorm Warning	EAX	Jackson	8 min
Aug 12, 5:43 PM CDT	Severe Thunderstorm Warning	EAX	Cass, Jackson, Johnson	32 min
Aug 12, 6:15 PM CDT	Special Weather Statement	EAX	Cass	45 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.