Alert archive / Kansas / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 145, NWS Topeka, KS

August 20, 20214 counties in Kansas

NWS Topeka, KS issued this severe thunderstorm warning at Aug 20, 2021, 7:07 PM CDT for 4 counties in Kansas. It was in force for 38 min. 8 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 20, 2021, 7:07 PM CDT (00:07 UTC)
Expired: Aug 20, 2021, 7:45 PM CDT
In force: 38 min
Issued by: NWS Topeka, KS
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Clay County, KS, Dickinson County, KS, Geary County, KS, Riley County, KS

The radar

The Topeka radar (KTWX), 67 km from the middle of the area, began a volume at 00:07 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, 7:20 PM CDT	TSTM WND DMG	1 S Milford, KS	CORRECTS LOCATION OF PREV TSTM WND DMG REPORT FROM 5 S MILFORD. SOCIAL MEDIA POST SHOWING CAMPER TRAILERS FLIPPED OVER.
Aug 20, 7:20 PM CDT	TSTM WND DMG	5 S Milford, KS	CORRECTS LOCATION OF PREV TSTM WND DMG REPORT FROM 5 S MILFORD. SOCIAL MEDIA POST SHOWING CAMPER TRAILERS FLIPPED OVER.
Aug 20, 7:20 PM CDT	TSTM WND DMG	5 S Milford, KS	SOCIAL MEDIA POST SHOWING CAMPER TRAILERS FLIPPED OVER.
Aug 20, 7:20 PM CDT	TSTM WND DMG	Milford, KS	CORRECTS PREVIOUS TSTM WND DMG REPORT FROM MILFORD. DELAYED REPORT FROM SOCIAL MEDIA. PICTURES SHOW AN OVERTURNED FIFTH WHEEL CAMPER.
Aug 20, 7:20 PM CDT	TSTM WND DMG	Milford Lake, KS	DELAYED REPORT FROM SOCIAL MEDIA. PICTURES SHOW AN OVER-TUNED FIFTH WHEEL CAMPER.
Aug 20, 7:23 PM CDT	TSTM WND GST 70	5 Se Milford, KS
Aug 20, 7:23 PM CDT	TSTM WND GST 70	5 Se Milford, KS	CORRECTS PREVIOUS TSTM WND GST REPORT FROM 5 SE MILFORD.
Aug 20, 7:25 PM CDT	TSTM WND DMG	Junction City, KS	2 FOOT DIAMETER HEALTHY TREE DOWN... ESTIMATED WIND SPEED 60 TO 70 MPH.

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, 4:39 PM CDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Topeka, KS (KTOP), launched 00:00Z, 0.1 hours before the alert went out and 118 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.

537 
WUUS53 KTOP 210007
SVRTOP
KSC027-041-061-161-210045-
/O.NEW.KTOP.SV.W.0145.210821T0007Z-210821T0045Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Topeka KS
707 PM CDT Fri Aug 20 2021

The National Weather Service in Topeka has issued a

* Severe Thunderstorm Warning for...
  Northeastern Dickinson County in central Kansas...
  Western Geary County in east central Kansas...
  Southwestern Riley County in northeastern Kansas...
  Southeastern Clay County in north central Kansas...

* Until 745 PM CDT.

* At 707 PM CDT, a severe thunderstorm was located over Moonlight,
  moving east at 50 mph.

  HAZARD...60 mph wind gusts and quarter size hail.

  SOURCE...Trained weather spotters.

  IMPACT...Hail damage to vehicles is expected. Expect wind damage 
           to roofs, siding, and trees.

* Locations impacted include...
  Junction City, Grandview Plaza, Chapman, Enterprise, Milford,
  Milford Lake and Moonlight.

This includes Interstate 70 between mile markers 279 and 304.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3912 9721 3922 9678 3895 9667 3890 9714
TIME...MOT...LOC 0007Z 247DEG 42KT 3901 9708 

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

$$

Teefey

1 follow-up statement

942 
WWUS53 KTOP 210036
SVSTOP

Severe Weather Statement
National Weather Service Topeka KS
736 PM CDT Fri Aug 20 2021

KSC027-041-061-161-210045-
/O.EXP.KTOP.SV.W.0145.000000T0000Z-210821T0045Z/
Dickinson-Geary-Riley-Clay-
736 PM CDT Fri Aug 20 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN DICKINSON...
WESTERN GEARY...SOUTHWESTERN RILEY AND SOUTHEASTERN CLAY COUNTIES
WILL EXPIRE AT 745 PM CDT...
        
The storm which prompted the warning has moved out of the area.
Therefore, the warning will be allowed to expire. A new warning has 
been issued for southwestern Riley County.

A Severe Thunderstorm Watch remains in effect until 1100 PM CDT for
central, north central, northeastern and east central Kansas.

LAT...LON 3912 9721 3922 9678 3895 9667 3890 9714
TIME...MOT...LOC 0035Z 247DEG 42KT 3913 9672 

$$

Teefey

The office that day

Everything else NWS Topeka, KS issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 20, 7:15 PM CDT	Special Weather Statement	TOP	Marshall, Nemaha	30 min
Aug 20, 7:23 PM CDT	Severe Thunderstorm Warning	TOP	Pottawatomie	37 min
Aug 20, 7:27 PM CDT	Severe Thunderstorm Warning	TOP	Geary, Pottawatomie, Riley	33 min
Aug 20, 7:45 PM CDT	Special Weather Statement	TOP	Brown, Jackson, Nemaha, Pottawatomie	30 min
Aug 20, 7:51 PM CDT	Severe Thunderstorm Warning	TOP	Brown, Nemaha	39 min
Aug 20, 7:56 PM CDT	Severe Thunderstorm Warning	TOP	Jackson, Pottawatomie, Riley, Wabaunsee	34 min
Aug 20, 8:01 PM CDT	Severe Thunderstorm Warning	TOP	Dickinson, Morris	44 min
Aug 20, 8:29 PM CDT	Special Weather Statement	TOP	Jackson, Wabaunsee	31 min
Aug 20, 8:32 PM CDT	Severe Thunderstorm Warning	TOP	Geary, Lyon, Morris, Wabaunsee	28 min
Aug 20, 8:33 PM CDT	Special Weather Statement	TOP	Cloud	27 min
Aug 20, 8:58 PM CDT	Special Weather Statement	TOP	Brown, Geary, Jackson, Jefferson, Nemaha, Pottawatomie and 2 more	47 min
Aug 20, 9:01 PM CDT	Special Weather Statement	TOP	Lyon	29 min
Aug 20, 9:37 PM CDT	Special Weather Statement	TOP	Lyon, Osage	23 min
Aug 20, 9:40 PM CDT	Special Weather Statement	TOP	Brown, Jackson, Jefferson, Pottawatomie, Shawnee, Wabaunsee	35 min
Aug 20, 9:43 PM CDT	Severe Thunderstorm Warning	TOP	Douglas, Jefferson, Osage, Shawnee	32 min
Aug 20, 9:53 PM CDT	Severe Thunderstorm Warning	TOP	Jackson, Jefferson, Shawnee	37 min
Aug 20, 10:00 PM CDT	Severe Thunderstorm Warning	TOP	Douglas, Jefferson, Osage, Shawnee	45 min
Aug 20, 10:08 PM CDT	Severe Thunderstorm Warning	TOP	Jefferson	37 min
Aug 20, 10:32 PM CDT	Areal Flood Advisory	TOP	Jackson, Jefferson	2 hr
Aug 20, 10:40 PM CDT	Special Weather Statement	TOP	Osage	50 min
Aug 20, 11:06 PM CDT	Severe Thunderstorm Warning	TOP	Osage	24 min
Aug 20, 11:30 PM CDT	Severe Thunderstorm Warning	TOP	Douglas, Franklin, Osage	25 min
Aug 21, 12:57 AM CDT	Special Weather Statement	TOP	Anderson	48 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.