Alert archive / Kansas / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 124, NWS Kansas City, MO

August 20, 2021Doniphan County, Kansas; Holt County, Missouri

NWS Kansas City, MO issued this severe thunderstorm warning at Aug 20, 2021, 8:10 PM CDT for Doniphan County, Kansas; Holt County, Missouri. It was in force for 20 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: Aug 20, 2021, 8:10 PM CDT (01:10 UTC)
Expired: Aug 20, 2021, 8:30 PM CDT
In force: 20 min
Issued by: NWS Kansas City, MO
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Doniphan County, KS, Holt County, MO

The radar

The Pleasant Hill radar (KEAX), 132 km from the middle of the area, began a volume at 01:10 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 20, 8:30 PM CDT	TSTM WND GST 60	Oregon, MO	LOTS OF LEAF LITTER REPORTED ON ROADWAY.

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 20, 7:40 PM CDT	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

Topeka, KS (KTOP), launched 00:00Z, 1.2 hours before the alert went out and 103 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.

742 
WUUS53 KEAX 210110
SVREAX
KSC043-MOC087-210130-
/O.NEW.KEAX.SV.W.0124.210821T0110Z-210821T0130Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Kansas City/Pleasant Hill MO
810 PM CDT Fri Aug 20 2021

The National Weather Service in Pleasant Hill has issued a

* Severe Thunderstorm Warning for...
  Doniphan County in northeastern Kansas...
  Southeastern Holt County in northwestern Missouri...

* Until 830 PM CDT.

* At 810 PM CDT, severe thunderstorms were located along a line
  extending from 7 miles east of Shubert to near Falls City to near
  Hamlin, moving east at 40 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

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

* Locations impacted include...
  Highland, Troy, Oregon, Forest City, White Cloud, Denton,
  Severance, Leona, Iowa Point, Fanning and Bendena.

This includes Interstate 29 between mile markers 67 and 70.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4000 9534 4000 9501 3996 9499 3992 9500
      3990 9499 3974 9496 3973 9497 3969 9497
      3967 9499 3967 9502 3965 9504 3971 9534
TIME...MOT...LOC 0110Z 275DEG 37KT 4026 9553 4005 9549 3986 9562 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 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, 8:29 PM CDT	Special Weather Statement	EAX	Doniphan	31 min
Aug 20, 8:31 PM CDT	Severe Thunderstorm Warning	EAX	Doniphan	44 min
Aug 20, 9:13 PM CDT	Special Weather Statement	EAX	Atchison, Leavenworth	47 min
Aug 20, 9:41 PM CDT	Special Weather Statement	EAX	Leavenworth, Wyandotte	49 min
Aug 20, 10:11 PM CDT	Special Weather Statement	EAX	Johnson, Leavenworth, Wyandotte	49 min
Aug 20, 10:29 PM CDT	Special Weather Statement	EAX	Atchison	46 min
Aug 20, 10:44 PM CDT	Severe Thunderstorm Warning	EAX	Johnson, Leavenworth, Wyandotte	46 min
Aug 20, 11:18 PM CDT	Special Weather Statement	EAX	Linn, Miami	42 min
Aug 20, 7:39 PM CDT	Severe Thunderstorm Warning	EAX	Atchison, Holt, Nodaway	51 min
Aug 20, 11:39 PM CDT	Special Weather Statement	EAX	Cooper, Howard, Pettis, Saline	51 min
Aug 21, 12:02 AM CDT	Special Weather Statement	EAX	Henry, Pettis	28 min

Nearby

Severe Thunderstorm Warnings in Kansas, 2021 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.