Alert archive / Kansas / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 139, NWS Topeka, KS

August 20, 20214 counties in Kansas

NWS Topeka, KS issued this severe thunderstorm warning at Aug 20, 2021, 5:40 PM CDT for 4 counties in Kansas. It was in force for 50 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, 5:40 PM CDT (22:40 UTC)
Expired: Aug 20, 2021, 6:30 PM CDT
In force: 50 min
Issued by: NWS Topeka, KS
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Clay County, KS, Cloud County, KS, Dickinson County, KS, Ottawa County, KS

The radar

The Topeka radar (KTWX), 119 km from the middle of the area, began a volume at 22:43 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, 5:55 PM CDT	TSTM WND GST 60	6 N Wells, KS	SPOTTER ESTIMATED 50-60MPH WIND GUSTS.

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 12:00Z, 10.7 hours before the alert went out and 169 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: 1273 J/kg
Mixed-layer CIN: -61 J/kg
Mixed-layer LCL: 702 m above ground
0-6 km bulk shear: 21 kt
0-1 km storm-relative helicity: 148 m²/s²
0-3 km storm-relative helicity: 138 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 2.7

Open this sounding in Storm Lab

The text

As transmitted.

326 
WUUS53 KTOP 202240
SVRTOP
KSC027-029-041-143-202330-
/O.NEW.KTOP.SV.W.0139.210820T2240Z-210820T2330Z/

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

The National Weather Service in Topeka has issued a

* Severe Thunderstorm Warning for...
  Northwestern Dickinson County in central Kansas...
  Ottawa County in north central Kansas...
  Southwestern Clay County in north central Kansas...
  Southeastern Cloud County in north central Kansas...

* Until 630 PM CDT.

* At 540 PM CDT, a severe thunderstorm was located 5 miles northeast
  of Minneapolis, moving northeast 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...
  Minneapolis, Bennington, Miltonvale, Delphos, Wells, Manchester,
  Longford, Oak Hill, Talmage and Idana.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3930 9780 3943 9722 3901 9722 3901 9787
TIME...MOT...LOC 2240Z 243DEG 34KT 3919 9766 

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

$$

Teefey

4 follow-up statements

876 
WWUS53 KTOP 202257
SVSTOP

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

KSC027-029-041-143-202330-
/O.CON.KTOP.SV.W.0139.000000T0000Z-210820T2330Z/
Dickinson-Ottawa-Clay-Cloud-
557 PM CDT Fri Aug 20 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 630 PM CDT
FOR NORTHWESTERN DICKINSON...EASTERN OTTAWA...SOUTHWESTERN CLAY AND
SOUTHEASTERN CLOUD COUNTIES...

At 557 PM CDT, a severe thunderstorm was located 6 miles south of
Miltonvale, moving northeast at 40 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...
Minneapolis, Bennington, Miltonvale, Wells, Manchester, Longford, Oak
Hill, Talmage and Idana.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3930 9772 3943 9722 3901 9722 3901 9780
TIME...MOT...LOC 2257Z 243DEG 34KT 3926 9748 

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

$$

Teefey

021 
WWUS53 KTOP 202310
SVSTOP

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

KSC027-029-041-143-202330-
/O.CON.KTOP.SV.W.0139.000000T0000Z-210820T2330Z/
Dickinson-Ottawa-Clay-Cloud-
610 PM CDT Fri Aug 20 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 630 PM CDT
FOR NORTHWESTERN DICKINSON...NORTHEASTERN OTTAWA...SOUTHWESTERN CLAY
AND SOUTHEASTERN CLOUD COUNTIES...

At 609 PM CDT, a severe thunderstorm was located 4 miles north of Oak
Hill, moving northeast at 40 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...
Minneapolis, Miltonvale, Wells, Manchester, Longford, Oak Hill,
Talmage and Idana.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3931 9764 3943 9722 3901 9722 3907 9770
TIME...MOT...LOC 2309Z 243DEG 34KT 3931 9734 

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

$$

Teefey

298 
WWUS53 KTOP 202320
SVSTOP

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

KSC027-029-041-143-202330-
/O.CON.KTOP.SV.W.0139.000000T0000Z-210820T2330Z/
Dickinson-Ottawa-Clay-Cloud-
620 PM CDT Fri Aug 20 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 630 PM CDT
FOR NORTHWESTERN DICKINSON...NORTHEASTERN OTTAWA...SOUTHWESTERN CLAY
AND SOUTHEASTERN CLOUD COUNTIES...

At 619 PM CDT, a severe thunderstorm was located near Idana, moving
northeast 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...
Manchester, Longford, Oak Hill, Idana and Talmage. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3931 9751 3943 9722 3901 9722 3905 9751
TIME...MOT...LOC 2319Z 243DEG 34KT 3936 9722 

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

$$

Teefey

858 
WWUS53 KTOP 202323
SVSTOP

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

KSC027-029-041-143-202333-
/O.EXP.KTOP.SV.W.0139.000000T0000Z-210820T2330Z/
Dickinson-Ottawa-Clay-Cloud-
623 PM CDT Fri Aug 20 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN DICKINSON...
NORTHEASTERN OTTAWA...SOUTHWESTERN CLAY AND SOUTHEASTERN CLOUD
COUNTIES WILL EXPIRE AT 630 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 1100 PM CDT for
central and north central Kansas.

LAT...LON 3931 9751 3943 9722 3901 9722 3905 9751
TIME...MOT...LOC 2323Z 243DEG 34KT 3937 9719 

$$

Teefey

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 20, 4:09 AM CDT	Special Weather Statement	TOP	Cloud	36 min
Aug 20, 4:16 AM CDT	Severe Thunderstorm Warning	TOP	Cloud, Republic	29 min
Aug 20, 4:24 AM CDT	Special Weather Statement	TOP	Republic	21 min
Aug 20, 4:47 AM CDT	Special Weather Statement	TOP	Washington	28 min
Aug 20, 5:03 AM CDT	Special Weather Statement	TOP	Clay	42 min
Aug 20, 5:13 AM CDT	Special Weather Statement	TOP	Washington	47 min
Aug 20, 5:45 AM CDT	Special Weather Statement	TOP	Riley	45 min
Aug 20, 5:55 AM CDT	Special Weather Statement	TOP	Washington	35 min
Aug 20, 5:00 PM CDT	Severe Thunderstorm Warning	TOP	Cloud	30 min
Aug 20, 5:06 PM CDT	Special Weather Statement	TOP	Ottawa	24 min
Aug 20, 5:20 PM CDT	Severe Thunderstorm Warning	TOP	Cloud, Ottawa	25 min
Aug 20, 5:27 PM CDT	Severe Thunderstorm Warning	TOP	Cloud	33 min
Aug 20, 5:35 PM CDT	Special Weather Statement	TOP	Cloud	25 min
Aug 20, 5:56 PM CDT	Severe Thunderstorm Warning	TOP	Republic, Washington	34 min
Aug 20, 6:00 PM CDT	Special Weather Statement	TOP	Cloud	30 min
Aug 20, 6:22 PM CDT	Special Weather Statement	TOP	Clay, Washington	38 min
Aug 20, 6:25 PM CDT	Severe Thunderstorm Warning	TOP	Republic, Washington	35 min
Aug 20, 6:42 PM CDT	Special Weather Statement	TOP	Dickinson	18 min
Aug 20, 6:45 PM CDT	Severe Thunderstorm Warning	TOP	Dickinson	30 min
Aug 20, 6:48 PM CDT	Special Weather Statement	TOP	Marshall	27 min
Aug 20, 6:52 PM CDT	Severe Thunderstorm Warning	TOP	Marshall, Washington	32 min
Aug 20, 6:55 PM CDT	Severe Thunderstorm Warning	TOP	Clay, Pottawatomie, Riley	35 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.