Alert archive / Kansas / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 88, NWS Kansas City, MO

July 10, 2021Johnson County, Leavenworth County, Kansas

NWS Kansas City, MO issued this severe thunderstorm warning at Jul 10, 2021, 7:17 PM CDT for Johnson County, Leavenworth County, Kansas. It was in force for 28 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: Jul 10, 2021, 7:17 PM CDT (00:17 UTC)
Expired: Jul 10, 2021, 7:45 PM CDT
In force: 28 min
Issued by: NWS Kansas City, MO
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Johnson County, KS, Leavenworth County, KS

The radar

The Pleasant Hill radar (KEAX), 70 km from the middle of the area, began a volume at 00:20 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
Jul 10, 7:24 PM CDT	HAIL 0.88	3 W Linwood, KS

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
Jul 10, 2:18 PM CDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Topeka, KS (KTOP), launched 00:00Z, 0.3 hours before the alert went out and 52 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: 1434 J/kg
Mixed-layer CIN: -5 J/kg
Mixed-layer LCL: 1268 m above ground
0-6 km bulk shear: 36 kt
0-1 km storm-relative helicity: 3 m²/s²
0-3 km storm-relative helicity: 2 m²/s²
Significant tornado parameter: -0.0
Supercell composite: -0.3

Open this sounding in Storm Lab

The text

As transmitted.

837 
WUUS53 KEAX 110017
SVREAX
KSC091-103-110045-
/O.NEW.KEAX.SV.W.0088.210711T0017Z-210711T0045Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Kansas City/Pleasant Hill MO
717 PM CDT Sat Jul 10 2021

The National Weather Service in Pleasant Hill has issued a

* Severe Thunderstorm Warning for...
  Southwestern Leavenworth County in northeastern Kansas...
  Western Johnson County in east central Kansas...

* Until 745 PM CDT.

* At 717 PM CDT, a severe thunderstorm was located near Eudora, or
  near Lawrence, moving east at 40 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...
  Olathe, Shawnee, Lenexa, Gardner, De Soto, Edgerton, Linwood, Reno,
  Clare and Clearview City.

This includes the following highways...
 Interstate 35 in Kansas between mile markers 204 and 213.
 Interstate 435 near mile marker 2.
 Kansas Turnpike between mile markers 206 and 214.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3910 9517 3901 9491 3899 9491 3900 9489
      3896 9477 3874 9490 3874 9497 3879 9506
      3898 9506 3899 9507 3898 9509 3896 9508
      3898 9516 3896 9517 3897 9519 3905 9519
TIME...MOT...LOC 0017Z 291DEG 33KT 3899 9515 

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

PP

1 follow-up statement

226 
WWUS53 KEAX 110042
SVSEAX

Severe Weather Statement
National Weather Service Kansas City/Pleasant Hill MO
742 PM CDT Sat Jul 10 2021

KSC091-103-110051-
/O.EXP.KEAX.SV.W.0088.000000T0000Z-210711T0045Z/
Leavenworth KS-Johnson KS-
742 PM CDT Sat Jul 10 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHWESTERN LEAVENWORTH AND
WESTERN JOHNSON COUNTIES WILL EXPIRE AT 745 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.  However gusty
winds are still possible with this thunderstorm.

A Severe Thunderstorm Watch remains in effect until 1000 PM CDT for
northeastern and east central Kansas.

LAT...LON 3910 9517 3901 9491 3899 9491 3900 9489
      3896 9477 3874 9490 3874 9497 3879 9506
      3898 9506 3899 9507 3898 9509 3896 9508
      3898 9516 3896 9517 3897 9519 3905 9519
TIME...MOT...LOC 0041Z 291DEG 33KT 3892 9492 

$$

PP

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 10, 7:14 PM CDT	Special Weather Statement	EAX	Johnson, Wyandotte	46 min
Jul 10, 8:07 PM CDT	Severe Thunderstorm Warning	EAX	Johnson, Miami	23 min
Jul 10, 8:53 PM CDT	Special Weather Statement	EAX	Miami	37 min

Nearby

Severe Thunderstorm Warnings in Kansas, 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.