Alert archive / Kansas / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 226, NWS Topeka, KS

August 30, 2018Shawnee County, Kansas

NWS Topeka, KS issued this severe thunderstorm warning at Aug 30, 2018, 9:55 AM CDT for Shawnee County, Kansas. It was in force for 28 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: Aug 30, 2018, 9:55 AM CDT (14:55 UTC)
Expired: Aug 30, 2018, 10:23 AM CDT
In force: 28 min
Issued by: NWS Topeka, KS
Area: Storm-based polygon
Hail: 1.0 in
Wind: 50.0 mph

County Shawnee County, KS

The radar

The Topeka radar (KTWX), 41 km from the middle of the area, began a volume at 14:57 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

Springfield, MO (KSGF), launched 12:00Z, 2.9 hours before the alert went out and 293 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: 1450 J/kg
Mixed-layer CIN: -147 J/kg
Mixed-layer LCL: 792 m above ground
0-6 km bulk shear: 9 kt
0-1 km storm-relative helicity: 81 m²/s²
0-3 km storm-relative helicity: 116 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 Aug 30, 6:38 AM CDT, 3 hours 17 minutes earlier.

Area forecast discussion, Aug 30, 6:38 AM CDT, 3 hours 17 minutes before

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Hazardous weather outlook, Aug 30, 4:18 AM CDT, 5 hours 37 minutes before

Hazardous Weather Outlook
National Weather Service Topeka KS
418 AM CDT Thu Aug 30 2018

KSZ008>012-020>024-026-034>040-054>056-058-059-310930-
Republic-Washington-Marshall-Nemaha-Brown-Cloud-Clay-Riley-
Pottawatomie-Jackson-Jefferson-Ottawa-Dickinson-Geary-Morris-
Wabaunsee-Shawnee-Douglas-Lyon-Osage-Franklin-Coffey-Anderson-
418 AM CDT Thu Aug 30 2018

This hazardous weather outlook is for east central...north
central and northeast Kansas.

.DAY ONE...Today and Tonight.

Scattered thunderstorms are possible during the morning hours
with the best chances being near and south of Interstate 70. The
strongest storms will be capable of hail up to quarter size,
gusty winds, and localized heavy rainfall.

There is a low end chance for a few thunderstorms during the late
afternoon and evening, primarily across east central and
northeast Kansas. If thunderstorms were able to form, large hail
and damaging winds would be possible.

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

The probability for widespread hazardous weather is low.

.SPOTTER INFORMATION STATEMENT...

Spotter activation will not be needed through tonight.

&&

More detailed information can be accessed at...
http://www.weather.gov/top/sitrep

In the hours before

Special weather statement, Aug 30, 6:58 AM CDT, 2 hours 57 minutes before

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Local storm report, Aug 30, 7:09 AM CDT, 2 hours 46 minutes before

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Local storm report, Aug 30, 7:27 AM CDT, 2 hours 28 minutes before

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Local storm report, Aug 30, 7:36 AM CDT, 2 hours 19 minutes before

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Special weather statement, Aug 30, 8:19 AM CDT, 1 hour 36 minutes before

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Local storm report, Aug 30, 9:34 AM CDT, 21 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 30, 12:49 AM CDT	Special Weather Statement	TOP	Jefferson	41 min
Aug 30, 3:42 AM CDT	Special Weather Statement	TOP	Lyon	48 min
Aug 30, 4:12 AM CDT	Special Weather Statement	TOP	Coffey	48 min
Aug 30, 4:20 AM CDT	Special Weather Statement	TOP	Lyon, Morris	55 min
Aug 30, 4:44 AM CDT	Special Weather Statement	TOP	Anderson, Coffey	61 min
Aug 30, 5:09 AM CDT	Special Weather Statement	TOP	Dickinson, Morris	51 min
Aug 30, 5:40 AM CDT	Special Weather Statement	TOP	Anderson, Coffey, Franklin	35 min
Aug 30, 5:48 AM CDT	Areal Flood Advisory	TOP	Coffey	3 hr
Aug 30, 5:58 AM CDT	Areal Flood Advisory	TOP	Anderson	3 hr
Aug 30, 5:58 AM CDT	Special Weather Statement	TOP	Dickinson	47 min
Aug 30, 6:00 AM CDT	Severe Thunderstorm Warning	TOP	Dickinson	30 min
Aug 30, 6:18 AM CDT	Special Weather Statement	TOP	Douglas, Franklin	42 min
Aug 30, 6:31 AM CDT	Special Weather Statement	TOP	Clay	29 min
Aug 30, 6:58 AM CDT	Special Weather Statement	TOP	Morris	32 min
Aug 30, 7:33 AM CDT	Flash Flood Warning	TOP	Anderson	4 hr
Aug 30, 8:19 AM CDT	Special Weather Statement	TOP	Lyon	26 min
Aug 30, 11:13 AM CDT	Areal Flood Warning	TOP	Anderson, Coffey	4 hr

Nearby

Severe Thunderstorm Warnings in Kansas, 2018 Every severe thunderstorm warning in 2018

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.