Alert archive / Missouri / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 9, NWS Kansas City, MO

April 7, 2021Pettis County, Missouri

NWS Kansas City, MO issued this severe thunderstorm warning at Apr 7, 2021, 2:49 PM CDT for Pettis County, Missouri. It was in force for 26 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Apr 7, 2021, 2:49 PM CDT (19:49 UTC)
Expired: Apr 7, 2021, 3:15 PM CDT
In force: 26 min
Issued by: NWS Kansas City, MO
Area: Storm-based polygon
Tornado: Possible
Hail: 0.75 in
Wind: 60.0 mph

County Pettis County, MO

The radar

The Pleasant Hill radar (KEAX), 100 km from the middle of the area, began a volume at 19:50 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.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Apr 7, 12:02 PM CDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Springfield, MO (KSGF), launched 12:00Z, 7.8 hours before the alert went out and 198 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: 790 J/kg
Mixed-layer CIN: -275 J/kg
Mixed-layer LCL: 767 m above ground
0-6 km bulk shear: 45 kt
0-1 km storm-relative helicity: 186 m²/s²
0-3 km storm-relative helicity: 223 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.5

Open this sounding in Storm Lab

The text

As transmitted.

342 
WUUS53 KEAX 071949
SVREAX
MOC159-072015-
/O.NEW.KEAX.SV.W.0009.210407T1949Z-210407T2015Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Kansas City/Pleasant Hill MO
249 PM CDT Wed Apr 7 2021

The National Weather Service in Pleasant Hill has issued a

* Severe Thunderstorm Warning for...
  Southeastern Pettis County in central Missouri...

* Until 315 PM CDT.

* At 249 PM CDT, a severe thunderstorm was located near Cole Camp, or
  16 miles west of Versailles, moving northeast at 45 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

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

* Locations impacted include...
  Smithton.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Intense thunderstorm lines can produce brief tornadoes. Although a 
tornado is not immediately likely, it is best to move to an interior 
room on the lowest floor of a building. This storm may cause serious 
injury and significant property damage.

&&

LAT...LON 3854 9322 3869 9313 3869 9306 3853 9307
TIME...MOT...LOC 1949Z 208DEG 37KT 3843 9316 

TORNADO...POSSIBLE
HAIL...<.75IN
WIND...60MPH
 
$$

CDB

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 7, 6:33 AM CDT	Special Weather Statement	EAX	Cooper	27 min
Apr 7, 11:24 AM CDT	Special Weather Statement	EAX	Harrison	36 min
Apr 7, 11:39 AM CDT	Special Weather Statement	EAX	Grundy	36 min
Apr 7, 12:31 PM CDT	Special Weather Statement	EAX	DeKalb	29 min
Apr 7, 1:16 PM CDT	Special Weather Statement	EAX	Henry	29 min
Apr 7, 1:21 PM CDT	Special Weather Statement	EAX	Worth	24 min
Apr 7, 1:40 PM CDT	Special Weather Statement	EAX	Henry	35 min
Apr 7, 3:09 PM CDT	Severe Thunderstorm Warning	EAX	Cooper, Pettis	23 min
Apr 7, 3:34 PM CDT	Special Weather Statement	EAX	Howard	26 min
Apr 7, 4:39 PM CDT	Special Weather Statement	EAX	Adair, Macon	51 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.