Alert archive / Kansas / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 25, NWS Topeka, KS

May 8, 2021Jackson County, Jefferson County, Shawnee County, Kansas

NWS Topeka, KS issued this severe thunderstorm warning at May 8, 2021, 11:00 PM CDT for Jackson County, Jefferson County, Shawnee County, Kansas. It was in force for 45 min. 4 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
May 8, 2021, 11:00 PM CDT (04:00 UTC)
Expired
May 8, 2021, 11:45 PM CDT
In force
45 min
Issued by
NWS Topeka, KS
Area
Storm-based polygon
Hail
0.88 in
Wind
60.0 mph

Counties Jackson County, KS, Jefferson County, KS, Shawnee County, KS

The radar

The Topeka radar (KTWX), 75 km from the middle of the area, began a volume at 04:00 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
May 8, 11:10 PM CDTTSTM WND GST 70Valley Falls, KS
May 8, 11:13 PM CDTTSTM WND GST 704 W Oskaloosa, KSON K-92 HIGHWAY.
May 8, 11:16 PM CDTTSTM WND GST 705 Sse Ozawkie, KS
May 8, 11:20 PM CDTTSTM WND DMG3 Wnw Mclouth, KSTREE REPORTED DOWN AND BLOCKING THE ROAD.

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
May 8, 6:30 PM CDTTornado WatchSPC7 hr

The nearest sounding before it

Topeka, KS (KTOP), launched 00:00Z, 4.0 hours before the alert went out and 31 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 2021-05-09Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 377 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Topeka, KS at 00:00Z on 2021-05-09The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 106 square meters per square second.19395878Sfc1 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
377 J/kg
Mixed-layer CIN
-170 J/kg
Mixed-layer LCL
1653 m above ground
0-6 km bulk shear
39 kt
0-1 km storm-relative helicity
106 m²/s²
0-3 km storm-relative helicity
362 m²/s²
Significant tornado parameter
0.0
Supercell composite
6.0

Open this sounding in Storm Lab

The text

As transmitted.

077 
WUUS53 KTOP 090400
SVRTOP
KSC085-087-177-090445-
/O.NEW.KTOP.SV.W.0025.210509T0400Z-210509T0445Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Topeka KS
1100 PM CDT Sat May 8 2021

The National Weather Service in Topeka has issued a

* Severe Thunderstorm Warning for...
  Jefferson County in northeastern Kansas...
  Northeastern Shawnee County in east central Kansas...
  Southeastern Jackson County in northeastern Kansas...

* Until 1145 PM CDT.

* At 1059 PM CDT, severe thunderstorms were located along a line
  extending from near Denison to 4 miles east of Silver Lake, moving
  east at 35 mph.

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

  SOURCE...Radar indicated.

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

* Locations impacted include...
  Northeastern Topeka, Valley Falls, Oskaloosa, Perry, McLouth,
  Meriden, Hoyt, Ozawkie, Nortonville, Winchester, Denison,
  Williamstown, Perry Lake and Grantville.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Tornado Watch remains in effect until 100 AM CDT for northeastern
and east central Kansas.

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

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

&&

LAT...LON 3913 9519 3905 9519 3906 9540 3907 9544
      3906 9548 3907 9583 3949 9563 3949 9557
      3942 9557 3942 9518 3913 9518
TIME...MOT...LOC 0359Z 278DEG 29KT 3942 9561 3909 9578 

HAIL...0.88IN
WIND...60MPH
 
$$

Skow
2 follow-up statements
782 
WWUS53 KTOP 090416
SVSTOP

Severe Weather Statement
National Weather Service Topeka KS
1116 PM CDT Sat May 8 2021

KSC085-087-177-090445-
/O.CON.KTOP.SV.W.0025.000000T0000Z-210509T0445Z/
Jefferson-Shawnee-Jackson-
1116 PM CDT Sat May 8 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1145 PM CDT
FOR JEFFERSON...NORTHEASTERN SHAWNEE AND SOUTHEASTERN JACKSON
COUNTIES...

At 1115 PM CDT, severe thunderstorms were located along a line
extending from 4 miles east of Nortonville to near Perry, moving east
at 45 mph.

HAZARD...70 mph wind gusts and nickel size hail.

SOURCE...Emergency management.

IMPACT...Expect considerable tree damage. Damage is likely to mobile 
         homes, roofs, and outbuildings.

Locations impacted include...
Northeastern Topeka, Valley Falls, Oskaloosa, Perry, McLouth,
Meriden, Ozawkie, Nortonville, Winchester, Williamstown, Perry Lake
and Grantville.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Tornado Watch remains in effect until 100 AM CDT for northeastern
and east central Kansas.

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

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

&&

LAT...LON 3913 9519 3905 9519 3906 9540 3907 9544
      3906 9548 3907 9578 3949 9557 3942 9557
      3942 9518 3913 9518
TIME...MOT...LOC 0415Z 274DEG 41KT 3940 9526 3907 9543 

HAIL...0.88IN
WIND...70MPH
 
$$
810 
WWUS53 KTOP 090443
SVSTOP

Severe Weather Statement
National Weather Service Topeka KS
1143 PM CDT Sat May 8 2021

KSC085-087-177-090453-
/O.EXP.KTOP.SV.W.0025.000000T0000Z-210509T0445Z/
Jefferson-Shawnee-Jackson-
1143 PM CDT Sat May 8 2021

...THE SEVERE THUNDERSTORM WARNING FOR JEFFERSON...NORTHEASTERN
SHAWNEE AND SOUTHEASTERN JACKSON COUNTIES WILL EXPIRE AT 1145 PM
CDT...
    
The storms which prompted the warning have moved out of the area.
Therefore, the warning will be allowed to expire.  However gusty
winds are still possible with these thunderstorms through 1200 AM.

A Tornado Watch remains in effect until 100 AM CDT for northeastern
and east central Kansas.

LAT...LON 3913 9519 3905 9519 3906 9540 3907 9544
      3906 9548 3907 9578 3949 9557 3942 9557
      3942 9518 3913 9518
TIME...MOT...LOC 0443Z 278DEG 29KT 3937 9498 3904 9516 

$$

The office that day

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

IssuedProductOfficeCountiesLasted
May 8, 7:15 PM CDTSpecial Weather StatementTOPRepublic15 min
May 8, 7:27 PM CDTSevere Thunderstorm WarningTOPRepublic33 min
May 8, 7:52 PM CDTSpecial Weather StatementTOPMarshall23 min
May 8, 7:56 PM CDTSevere Thunderstorm WarningTOPRepublic, Washington49 min
May 8, 8:03 PM CDTSevere Thunderstorm WarningTOPMarshall42 min
May 8, 8:38 PM CDTSevere Thunderstorm WarningTOPMarshall, Washington52 min
May 8, 8:48 PM CDTSevere Thunderstorm WarningTOPDickinson57 min
May 8, 9:24 PM CDTSevere Thunderstorm WarningTOPGeary, Morris, Riley51 min
May 8, 9:27 PM CDTSpecial Weather StatementTOPMarshall33 min
May 8, 9:51 PM CDTSevere Thunderstorm WarningTOPGeary, Pottawatomie, Riley24 min
May 8, 10:03 PM CDTSevere Thunderstorm WarningTOPGeary, Jackson, Morris, Pottawatomie, Riley, Shawnee and 1 more42 min
May 8, 10:11 PM CDTTornado WarningTOPPottawatomie, Riley, Wabaunsee21 min
May 8, 10:43 PM CDTSevere Thunderstorm WarningTOPLyon, Osage, Shawnee, Wabaunsee47 min
May 8, 11:00 PM CDTSevere Thunderstorm WarningTOPDickinson45 min
May 8, 11:26 PM CDTSpecial Weather StatementTOPDouglas49 min
May 8, 11:42 PM CDTAreal Flood AdvisoryTOPShawnee, Wabaunsee3 hr
May 9, 12:00 AM CDTAreal Flood AdvisoryTOPDickinson, Geary3 hr
May 9, 12:00 AM CDTSpecial Weather StatementTOPDickinson45 min
May 9, 12:15 AM CDTFlash Flood WarningTOPShawnee, Wabaunsee4 hr
May 9, 12:31 AM CDTAreal Flood AdvisoryTOPDouglas3 hr
May 9, 12:58 AM CDTSpecial Weather StatementTOPMorris47 min
May 9, 2:28 AM CDTSpecial Weather StatementTOPCoffey32 min
May 9, 3:56 AM CDTSpecial Weather StatementTOPDouglas, Jackson, Jefferson, Shawnee49 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.