Alert archive / Kansas / Severe Thunderstorm Warnings in 2023

Severe Thunderstorm Warning 256, NWS Topeka, KS

September 21, 2023Lyon County, Morris County, Kansas

NWS Topeka, KS issued this severe thunderstorm warning at Sep 21, 2023, 5:18 PM CDT for Lyon County, Morris County, Kansas. It was in force for 42 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Sep 21, 2023, 5:18 PM CDT (22:18 UTC)
Expired
Sep 21, 2023, 6:00 PM CDT
In force
42 min
Issued by
NWS Topeka, KS
Area
Storm-based polygon
Hail
1.5 in
Wind
60.0 mph

Counties Lyon County, KS, Morris County, KS

The radar

The Topeka radar (KTWX), 50 km from the middle of the area, began a volume at 22:18 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.

The nearest sounding before it

Topeka, KS (KTOP), launched 12:00Z, 10.3 hours before the alert went out and 81 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 12:00Z on 2023-09-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 458 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 12:00Z on 2023-09-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 21 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
458 J/kg
Mixed-layer CIN
-232 J/kg
Mixed-layer LCL
804 m above ground
0-6 km bulk shear
22 kt
0-1 km storm-relative helicity
21 m²/s²
0-3 km storm-relative helicity
90 m²/s²
Significant tornado parameter
0.0
Supercell composite
-0.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Topeka, KS wrote its last area forecast discussion before this severe thunderstorm warning went out at Sep 21, 2:52 PM CDT, 2 hours 26 minutes earlier.

Area forecast discussion, Sep 21, 2:52 PM CDT, 2 hours 26 minutes before
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Hazardous weather outlook, Sep 21, 2:55 PM CDT, 2 hours 23 minutes before
Hazardous Weather Outlook
National Weather Service Topeka KS
255 PM CDT Thu Sep 21 2023

KSZ008>012-020>024-026-034>040-054>056-058-059-222000-
Republic-Washington-Marshall-Nemaha-Brown-Cloud-Clay-Riley-
Pottawatomie-Jackson-Jefferson-Ottawa-Dickinson-Geary-Morris-
Wabaunsee-Shawnee-Douglas-Lyon-Osage-Franklin-Coffey-Anderson-
255 PM CDT Thu Sep 21 2023

This Hazardous Weather Outlook is for central Kansas, east central
Kansas, north central Kansas and northeast Kansas.

.DAY ONE...This afternoon and tonight.

Scattered thunderstorms are likely this evening into Friday morning,
initially across north central Kansas this evening before spreading
east after midnight. Widespread severe weather is not expected, but
some storms could produce small hail and gusty winds.

.DAYS TWO THROUGH SEVEN...Friday through Wednesday.

Thunderstorms are again likely Saturday, particularly across
northeast and east-central Kansas. Some of these storms could be
severe, so stay tuned for future details.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected at this time.

&&

More detailed information can be found at:
www.weather.gov/media/top/DssPacket.pdf

In the hours before

Special weather statement, Sep 21, 3:50 PM CDT, 1 hour 28 minutes before
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Special weather statement, Sep 21, 4:12 PM CDT, 1 hour 6 minutes before
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Special weather statement, Sep 21, 4:27 PM CDT, 51 minutes before
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Special weather statement, Sep 21, 4:34 PM CDT, 44 minutes before
Special Weather Statement
National Weather Service Topeka KS
434 PM CDT Thu Sep 21 2023

KSZ008-212215-
Republic-
434 PM CDT Thu Sep 21 2023

...Strong thunderstorms will impact portions of central Republic
County through 515 PM CDT...

At 433 PM CDT, Doppler radar was tracking strong thunderstorms along
a line extending from 3 miles west of Republic to 5 miles east of
Norway. Movement was northeast at 20 mph.

HAZARD...Wind gusts up to 50 mph and nickel size hail.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects. Minor damage to outdoor objects is
         possible.

Locations impacted include...
Belleville, Scandia, Republic and Munden.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

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

&&

LAT...LON 4000 9756 3990 9738 3967 9773 3987 9793
      4000 9793
TIME...MOT...LOC 2133Z 216DEG 17KT 3991 9788 3972 9767

MAX HAIL SIZE...0.88 IN
MAX WIND GUST...50 MPH

BD
Special weather statement, Sep 21, 4:51 PM CDT, 27 minutes before
Special Weather Statement
National Weather Service Topeka KS
451 PM CDT Thu Sep 21 2023

KSZ008>010-020>022-212230-
Republic-Clay-Cloud-Riley-Washington-Marshall-
451 PM CDT Thu Sep 21 2023

...Strong thunderstorms will impact portions of northwestern Riley,
southeastern Republic, northeastern Clay, Washington, northeastern
Cloud and southwestern Marshall Counties through 530 PM CDT...

At 451 PM CDT, Doppler radar was tracking strong thunderstorms along
a line extending from near Cuba to 7 miles northwest of Green.
Movement was northeast at 30 mph.

HAZARD...Wind gusts up to 50 mph and nickel size hail.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects. Minor damage to outdoor objects is
         possible.

Locations impacted include...
Washington, Clyde, Clifton, Linn, Greenleaf, Morganville, Barnes,
Cuba, Morrowville, Palmer, Haddam, Mahaska, Agenda and Vining.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

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

&&

LAT...LON 4000 9717 3961 9669 3941 9713 3976 9764
      4000 9736
TIME...MOT...LOC 2151Z 239DEG 27KT 3979 9742 3952 9707

MAX HAIL SIZE...0.88 IN
MAX WIND GUST...50 MPH

BD
Special weather statement, Sep 21, 5:02 PM CDT, 16 minutes before
Special Weather Statement
National Weather Service Topeka KS
502 PM CDT Thu Sep 21 2023

KSZ037-054-212230-
Lyon-Morris-
502 PM CDT Thu Sep 21 2023

...A strong thunderstorm will impact portions of southeastern Morris
and west central Lyon Counties through 530 PM CDT...

At 502 PM CDT, Doppler radar was tracking a strong thunderstorm 7
miles north of Strong City, moving northeast at 30 mph.

HAZARD...Wind gusts up to 50 mph and nickel size hail.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects. Minor damage to outdoor objects is
         possible.

Locations impacted include...
Council Grove, Americus and Dunlap.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

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

&&

LAT...LON 3852 9635 3852 9659 3858 9661 3871 9642
      3849 9623 3845 9635
TIME...MOT...LOC 2202Z 243DEG 24KT 3850 9651

MAX HAIL SIZE...0.88 IN
MAX WIND GUST...50 MPH

BD

The office that day

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

IssuedProductOfficeCountiesLasted
Sep 21, 3:29 PM CDTSpecial Weather StatementTOPCloud31 min
Sep 21, 3:33 PM CDTSevere Thunderstorm WarningTOPCloud27 min
Sep 21, 3:50 PM CDTSpecial Weather StatementTOPCloud25 min
Sep 21, 4:12 PM CDTSpecial Weather StatementTOPCloud48 min
Sep 21, 4:27 PM CDTSpecial Weather StatementTOPClay33 min
Sep 21, 4:34 PM CDTSpecial Weather StatementTOPRepublic41 min
Sep 21, 4:51 PM CDTSpecial Weather StatementTOPWashington39 min
Sep 21, 5:02 PM CDTSpecial Weather StatementTOPMorris28 min
Sep 21, 5:58 PM CDTSpecial Weather StatementTOPLyon32 min
Sep 21, 6:28 PM CDTSpecial Weather StatementTOPOsage47 min
Sep 21, 6:34 PM CDTSevere Thunderstorm WarningTOPLyon10 min

Nearby

Severe Thunderstorm Warnings in Kansas, 2023Every severe thunderstorm warning in 2023

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.