Alert archive / Kansas / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 154, NWS Topeka, KS

August 20, 20214 counties in Kansas

NWS Topeka, KS issued this severe thunderstorm warning at Aug 20, 2021, 10:00 PM CDT for 4 counties in Kansas. It was in force for 45 min. 3 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, 10:00 PM CDT (03:00 UTC)
Expired
Aug 20, 2021, 10:45 PM CDT
In force
45 min
Issued by
NWS Topeka, KS
Area
Storm-based polygon
Hail
0.75 in
Wind
60.0 mph

Counties Douglas County, KS, Jefferson County, KS, Osage County, KS, Shawnee County, KS

The radar

The Pleasant Hill radar (KEAX), 86 km from the middle of the area, began a volume at 03:03 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

TimeReportWhereRemark
Aug 20, 10:19 PM CDTTSTM WND GST 603 S Lecompton, KS
Aug 20, 10:32 PM CDTTSTM WND DMG2 Sw Lawrence, KSTREE REPORTED DOWN. TIME ESTIMATED FROM RADAR.
Aug 20, 10:36 PM CDTTSTM WND DMG1 S Lawrence, KSTREE REPORTED DOWN. TIME ESTIMATED FROM RADAR.

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.

IssuedProductOfficeLasted
Aug 20, 4:39 PM CDTSevere Thunderstorm WatchSPC6 hr
Aug 20, 7:40 PM CDTSevere Thunderstorm WatchSPC5 hr

The nearest sounding before it

Topeka, KS (KTOP), launched 00:00Z, 3.0 hours before the alert went out and 36 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-pSkew-T log-p diagram, Topeka, KS at 00:00Z on 2021-08-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 3676 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Topeka, KS at 00:00Z on 2021-08-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 145 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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.

565 
WUUS53 KTOP 210300
SVRTOP
KSC045-087-139-177-210345-
/O.NEW.KTOP.SV.W.0154.210821T0300Z-210821T0345Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Topeka KS
1000 PM CDT Fri Aug 20 2021

The National Weather Service in Topeka has issued a

* Severe Thunderstorm Warning for...
  Southern Jefferson County in northeastern Kansas...
  Eastern Shawnee County in east central Kansas...
  Douglas County in east central Kansas...
  Northeastern Osage County in east central Kansas...

* Until 1045 PM CDT.

* At 1000 PM CDT, a severe thunderstorm was located 4 miles west of
  Clinton Lake, moving east at 40 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

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

* Locations impacted include...
  Northeastern Topeka, Lawrence, Oskaloosa, Tecumseh, Eudora,
  Richland, Perry, McLouth, Meriden, Lecompton, Clinton, Lone Star,
  Pleasant Grove, Vinland, Williamstown, Perry Lake, Grantville,
  Clinton Lake and Berryton.

This includes Kansas Turnpike between mile markers 180 and 205.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 3881 9562 3917 9568 3927 9518 3897 9519
      3896 9517 3898 9516 3897 9513 3897 9511
      3895 9509 3896 9508 3898 9508 3899 9506
      3880 9506
TIME...MOT...LOC 0300Z 265DEG 35KT 3894 9548 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

BD
3 follow-up statements
838 
WWUS53 KTOP 210325
SVSTOP

Severe Weather Statement
National Weather Service Topeka KS
1025 PM CDT Fri Aug 20 2021

KSC139-177-210334-
/O.CAN.KTOP.SV.W.0154.000000T0000Z-210821T0345Z/
Shawnee-Osage-
1025 PM CDT Fri Aug 20 2021

...THE SEVERE THUNDERSTORM WARNING FOR EASTERN SHAWNEE AND
NORTHEASTERN OSAGE COUNTIES IS CANCELLED...
    
The severe thunderstorm which prompted the warning has moved out of 
the warned area. Therefore, the warning has been cancelled.

A Severe Thunderstorm Watch remains in effect until 1100 PM CDT for
east central Kansas. A Severe Thunderstorm Watch also remains in
effect until 200 AM CDT for northeastern and east central Kansas.

LAT...LON 3881 9550 3905 9550 3907 9551 3907 9555
      3905 9558 3906 9560 3918 9559 3927 9518
      3897 9519 3896 9517 3898 9516 3897 9513
      3897 9511 3895 9509 3896 9508 3898 9508
      3899 9506 3880 9506
TIME...MOT...LOC 0324Z 264DEG 34KT 3896 9519 

$$

KSC045-087-210345-
/O.CON.KTOP.SV.W.0154.000000T0000Z-210821T0345Z/
Jefferson-Douglas-
1025 PM CDT Fri Aug 20 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1045 PM CDT
FOR SOUTHERN JEFFERSON AND DOUGLAS COUNTIES...

At 1024 PM CDT, a severe thunderstorm was located near Lawrence,
moving east at 40 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

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

Locations impacted include...
Lawrence, Oskaloosa, Eudora, Perry, McLouth, Meriden, Lecompton,
Clinton, Lone Star, Pleasant Grove, Vinland, Williamstown, Perry
Lake, Grantville and Clinton Lake.

This includes Kansas Turnpike between mile markers 189 and 205.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 3881 9550 3905 9550 3907 9551 3907 9555
      3905 9558 3906 9560 3918 9559 3927 9518
      3897 9519 3896 9517 3898 9516 3897 9513
      3897 9511 3895 9509 3896 9508 3898 9508
      3899 9506 3880 9506
TIME...MOT...LOC 0324Z 264DEG 34KT 3896 9519 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

BD
973 
WWUS53 KTOP 210332
SVSTOP

Severe Weather Statement
National Weather Service Topeka KS
1032 PM CDT Fri Aug 20 2021

KSC045-087-210345-
/O.CON.KTOP.SV.W.0154.000000T0000Z-210821T0345Z/
Jefferson-Douglas-
1032 PM CDT Fri Aug 20 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1045 PM CDT
FOR SOUTHEASTERN JEFFERSON AND CENTRAL DOUGLAS COUNTIES...

At 1032 PM CDT, a severe thunderstorm was located over Eudora, moving
east at 40 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

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

Locations impacted include...
Lawrence, Oskaloosa, Eudora, Perry, McLouth, Lecompton, Clinton, Lone
Star, Pleasant Grove, Vinland, Williamstown, Perry Lake and Clinton
Lake.

This includes Kansas Turnpike between mile markers 194 and 205.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 3881 9543 3903 9541 3920 9549 3927 9518
      3897 9519 3896 9517 3898 9516 3897 9513
      3897 9511 3895 9509 3896 9508 3898 9508
      3899 9506 3880 9506
TIME...MOT...LOC 0332Z 265DEG 35KT 3897 9508 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

BD
403 
WWUS53 KTOP 210343
SVSTOP

Severe Weather Statement
National Weather Service Topeka KS
1043 PM CDT Fri Aug 20 2021

KSC045-087-210353-
/O.EXP.KTOP.SV.W.0154.000000T0000Z-210821T0345Z/
Jefferson-Douglas-
1043 PM CDT Fri Aug 20 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN JEFFERSON AND
CENTRAL DOUGLAS COUNTIES WILL EXPIRE AT 1045 PM CDT...
        
The storm which prompted the warning has moved out of the area.
Therefore, the warning will be allowed to expire.

A Severe Thunderstorm Watch remains in effect until 200 AM CDT for
northeastern and east central Kansas.

LAT...LON 3881 9543 3903 9541 3920 9549 3927 9518
      3897 9519 3896 9517 3898 9516 3897 9513
      3897 9511 3895 9509 3896 9508 3898 9508
      3899 9506 3880 9506
TIME...MOT...LOC 0343Z 265DEG 35KT 3898 9496 

$$

BD

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 20, 7:07 PM CDTSevere Thunderstorm WarningTOPClay, Dickinson, Geary, Riley38 min
Aug 20, 7:15 PM CDTSpecial Weather StatementTOPMarshall, Nemaha30 min
Aug 20, 7:23 PM CDTSevere Thunderstorm WarningTOPPottawatomie37 min
Aug 20, 7:27 PM CDTSevere Thunderstorm WarningTOPGeary, Pottawatomie, Riley33 min
Aug 20, 7:45 PM CDTSpecial Weather StatementTOPBrown, Jackson, Nemaha, Pottawatomie30 min
Aug 20, 7:51 PM CDTSevere Thunderstorm WarningTOPBrown, Nemaha39 min
Aug 20, 7:56 PM CDTSevere Thunderstorm WarningTOPJackson, Pottawatomie, Riley, Wabaunsee34 min
Aug 20, 8:01 PM CDTSevere Thunderstorm WarningTOPDickinson, Morris44 min
Aug 20, 8:29 PM CDTSpecial Weather StatementTOPJackson, Wabaunsee31 min
Aug 20, 8:32 PM CDTSevere Thunderstorm WarningTOPGeary, Lyon, Morris, Wabaunsee28 min
Aug 20, 8:33 PM CDTSpecial Weather StatementTOPCloud27 min
Aug 20, 8:58 PM CDTSpecial Weather StatementTOPBrown, Geary, Jackson, Jefferson, Nemaha, Pottawatomie and 2 more47 min
Aug 20, 9:01 PM CDTSpecial Weather StatementTOPLyon29 min
Aug 20, 9:37 PM CDTSpecial Weather StatementTOPLyon, Osage23 min
Aug 20, 9:40 PM CDTSpecial Weather StatementTOPBrown, Jackson, Jefferson, Pottawatomie, Shawnee, Wabaunsee35 min
Aug 20, 9:43 PM CDTSevere Thunderstorm WarningTOPDouglas, Jefferson, Osage, Shawnee32 min
Aug 20, 9:53 PM CDTSevere Thunderstorm WarningTOPJackson, Jefferson, Shawnee37 min
Aug 20, 10:08 PM CDTSevere Thunderstorm WarningTOPJefferson37 min
Aug 20, 10:32 PM CDTAreal Flood AdvisoryTOPJackson, Jefferson2 hr
Aug 20, 10:40 PM CDTSpecial Weather StatementTOPOsage50 min
Aug 20, 11:06 PM CDTSevere Thunderstorm WarningTOPOsage24 min
Aug 20, 11:30 PM CDTSevere Thunderstorm WarningTOPDouglas, Franklin, Osage25 min
Aug 21, 12:57 AM CDTSpecial Weather StatementTOPAnderson48 min

Nearby

Severe Thunderstorm Warnings in Kansas, 2021Every 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.