Alert archive / Kansas / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 137, NWS Topeka, KS

August 20, 2021Cloud County, Ottawa County, Kansas

NWS Topeka, KS issued this severe thunderstorm warning at Aug 20, 2021, 5:20 PM CDT for Cloud County, Ottawa County, Kansas. It was in force for 25 min. 2 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, 5:20 PM CDT (22:20 UTC)
Expired: Aug 20, 2021, 5:45 PM CDT
In force: 25 min
Issued by: NWS Topeka, KS
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Cloud County, KS, Ottawa County, KS

The radar

The Topeka radar (KTWX), 133 km from the middle of the area, began a volume at 22:19 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, 5:26 PM CDT	HAIL 1	4 Ene Ada, KS
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, 10.3 hours before the alert went out and 183 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.

776 
WUUS53 KTOP 202220
SVRTOP
KSC029-143-202245-
/O.NEW.KTOP.SV.W.0137.210820T2220Z-210820T2245Z/

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

The National Weather Service in Topeka has issued a

* Severe Thunderstorm Warning for...
  Northern Ottawa County in north central Kansas...
  South central Cloud County in north central Kansas...

* Until 545 PM CDT.

* At 520 PM CDT, a severe thunderstorm was located near Ada, 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, Delphos, Wells and Ada. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3927 9793 3937 9749 3911 9744 3905 9793
TIME...MOT...LOC 2220Z 244DEG 33KT 3916 9782 

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

$$

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, 5:27 PM CDT	Severe Thunderstorm Warning	TOP	Cloud	33 min
Aug 20, 5:35 PM CDT	Special Weather Statement	TOP	Cloud	25 min
Aug 20, 5:40 PM CDT	Severe Thunderstorm Warning	TOP	Clay, Cloud, Dickinson, Ottawa	50 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.