Alert archive / Missouri / Special Weather Statements in 2021

Special Weather Statement, NWS Kansas City, MO

August 20, 20214 counties in Missouri

NWS Kansas City, MO issued this special weather statement at Aug 20, 2021, 11:39 PM CDT for 4 counties in Missouri. It was in force for 51 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: Aug 20, 2021, 11:39 PM CDT (04:39 UTC)
Expired: Aug 21, 2021, 12:30 AM CDT
In force: 51 min
Issued by: NWS Kansas City, MO
Hail: 0.00 in
Wind: 40

Counties Cooper County, MO, Howard County, MO, Pettis County, MO, Saline County, MO

The radar

The Pleasant Hill radar (KEAX), 124 km from the middle of the area, began a volume at 04:42 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 nearest sounding before it

Topeka, KS (KTOP), launched 00:00Z, 4.7 hours before the alert went out and 239 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: 3676 J/kg
Mixed-layer CIN: -53 J/kg
Mixed-layer LCL: 1017 m above ground
0-6 km bulk shear: 18 kt
0-1 km storm-relative helicity: 145 m²/s²
0-3 km storm-relative helicity: 242 m²/s²
Significant tornado parameter: 3.1
Supercell composite: 18.5

Open this sounding in Storm Lab

The text

As transmitted.

075 
WWUS83 KEAX 210439
SPSEAX

Special Weather Statement
National Weather Service Kansas City/Pleasant Hill MO
1139 PM CDT Fri Aug 20 2021
 
MOZ032-033-039-040-045-046-210530-
Saline MO-Chariton MO-Pettis MO-Randolph MO-Cooper MO-Howard MO-
1139 PM CDT Fri Aug 20 2021

...Strong thunderstorms will impact portions of southeastern
Chariton, southwestern Randolph, Pettis, Howard, central Saline and
Cooper Counties through 1230 AM CDT...

At 1139 PM CDT, Doppler radar was tracking strong thunderstorms along
a line extending from near Brunswick to near Marshall to near La
Monte. Movement was east at 45 mph.

HAZARD...Winds in excess of 40 mph.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around 
         unsecured objects.

Locations impacted include...
Sedalia, Marshall, Boonville, Fayette, Slater, Glasgow, La Monte, New
Franklin, Brunswick, Pilot Grove, Smithton, Higbee, Otterville,
Bunceton, Armstrong, Houstonia, Prairie Home, Gilliam, Nelson and
Hughesville.

This includes Interstate 70 in Missouri between mile markers 70 and
114.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building. 

Torrential rainfall is also occurring with these storms and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.

Frequent cloud to ground lightning is occurring with these storms.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

These storms may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.

&&

LAT...LON 3925 9240 3925 9243 3898 9257 3891 9250
      3868 9262 3870 9306 3858 9307 3878 9351
      3886 9350 3908 9324 3938 9315 3938 9311
      3945 9313 3931 9239
TIME...MOT...LOC 0439Z 283DEG 38KT 3936 9307 3906 9315 3877 9349 

MAX HAIL SIZE...0.00 IN
MAX WIND GUST...40 MPH

$$

Leighton

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 20, 7:39 PM CDT	Severe Thunderstorm Warning	EAX	Atchison, Holt, Nodaway	51 min
Aug 20, 8:10 PM CDT	Severe Thunderstorm Warning	EAX	Holt	20 min
Aug 20, 8:29 PM CDT	Special Weather Statement	EAX	Andrew, Buchanan, Holt	31 min
Aug 20, 8:31 PM CDT	Severe Thunderstorm Warning	EAX	Andrew, Buchanan, Clinton, DeKalb, Gentry, Holt and 1 more	44 min
Aug 20, 9:13 PM CDT	Special Weather Statement	EAX	Buchanan, Platte	47 min
Aug 20, 9:41 PM CDT	Special Weather Statement	EAX	Buchanan, Caldwell, Clay, Clinton, Platte	49 min
Aug 20, 10:11 PM CDT	Special Weather Statement	EAX	Clay, Jackson, Ray	49 min
Aug 20, 10:44 PM CDT	Severe Thunderstorm Warning	EAX	Cass, Clay, Jackson, Platte	46 min
Aug 20, 11:18 PM CDT	Special Weather Statement	EAX	Bates, Cass, Johnson	42 min
Aug 21, 12:02 AM CDT	Special Weather Statement	EAX	Henry, Pettis	28 min
Aug 20, 10:29 PM CDT	Special Weather Statement	EAX	Atchison	46 min

Nearby

Special Weather Statements in Missouri, 2021 Every special weather statement 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.