Alert archive / Kansas / Severe Thunderstorm Warnings in 2026

Severe Thunderstorm Warning 342, NWS Topeka, KS

July 4, 2026Lyon County, Morris County, Kansas

NWS Topeka, KS issued this severe thunderstorm warning at Jul 4, 2026, 10:03 AM 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: Jul 4, 2026, 10:03 AM CDT (15:03 UTC)
Expired: Jul 4, 2026, 10:45 AM CDT
In force: 42 min
Issued by: NWS Topeka, KS
Area: Storm-based polygon
Damage threat: Considerable
Hail: 0.75 in
Wind: 70.0 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 15:03 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.

The nearest sounding before it

Topeka, KS (KTOP), launched 12:00Z, 3.1 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-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: 264 J/kg
Mixed-layer CIN: -286 J/kg
Mixed-layer LCL: 1308 m above ground
0-6 km bulk shear: 18 kt
0-1 km storm-relative helicity: 136 m²/s²
0-3 km storm-relative helicity: 153 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 2.7

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 Jul 4, 6:30 AM CDT, 3 hours 33 minutes earlier.

Area forecast discussion, Jul 4, 6:30 AM CDT, 3 hours 33 minutes before

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Hazardous weather outlook, Jul 4, 2:38 AM CDT, 7 hours 25 minutes before

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In the hours before

Special weather statement, Jul 4, 5:35 AM CDT, 4 hours 28 minutes before

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Special weather statement, Jul 4, 5:43 AM CDT, 4 hours 20 minutes before

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Special weather statement, Jul 4, 5:59 AM CDT, 4 hours 4 minutes before

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Special weather statement, Jul 4, 7:22 AM CDT, 2 hours 41 minutes before

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Special weather statement, Jul 4, 7:43 AM CDT, 2 hours 20 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
Jul 3, 7:13 PM CDT	Tornado Warning	TOP	Republic, Washington	32 min
Jul 3, 7:18 PM CDT	Severe Thunderstorm Warning	TOP	Republic, Washington	42 min
Jul 3, 7:27 PM CDT	Tornado Warning	TOP	Republic, Washington	48 min
Jul 3, 7:37 PM CDT	Severe Thunderstorm Warning	TOP	Cloud, Republic	23 min
Jul 3, 7:44 PM CDT	Severe Thunderstorm Warning Considerable damage threat	TOP	Republic	16 min
Jul 3, 7:58 PM CDT	Severe Thunderstorm Warning	TOP	Cloud, Republic, Washington	47 min
Jul 3, 8:41 PM CDT	Severe Thunderstorm Warning	TOP	Clay, Cloud, Marshall, Ottawa, Republic, Riley and 1 more	49 min
Jul 3, 9:02 PM CDT	Special Weather Statement	TOP	Pottawatomie, Riley	43 min
Jul 3, 9:14 PM CDT	Severe Thunderstorm Warning	TOP	Clay, Dickinson, Geary, Pottawatomie, Riley	31 min
Jul 3, 9:40 PM CDT	Severe Thunderstorm Warning	TOP	Clay, Dickinson, Geary, Pottawatomie, Riley	23 min
Jul 3, 9:44 PM CDT	Special Weather Statement	TOP	Dickinson, Geary, Pottawatomie, Wabaunsee	46 min
Jul 3, 9:47 PM CDT	Special Weather Statement	TOP	Clay, Cloud	43 min
Jul 3, 10:24 PM CDT	Special Weather Statement	TOP	Geary, Morris, Shawnee, Wabaunsee	36 min
Jul 3, 10:27 PM CDT	Special Weather Statement	TOP	Clay, Ottawa	33 min
Jul 3, 10:56 PM CDT	Special Weather Statement	TOP	Douglas, Lyon, Osage	49 min
Jul 3, 10:59 PM CDT	Special Weather Statement	TOP	Clay	46 min
Jul 3, 11:14 PM CDT	Special Weather Statement	TOP	Brown	46 min
Jul 4, 5:35 AM CDT	Special Weather Statement	TOP	Geary	40 min
Jul 4, 5:43 AM CDT	Special Weather Statement	TOP	Morris	32 min
Jul 4, 5:59 AM CDT	Special Weather Statement	TOP	Pottawatomie	31 min
Jul 4, 7:22 AM CDT	Special Weather Statement	TOP	Lyon	23 min
Jul 4, 7:43 AM CDT	Special Weather Statement	TOP	Jackson	32 min
Jul 4, 9:58 AM CDT	Areal Flood Advisory	TOP	Lyon	3 hr
Jul 4, 10:27 AM CDT	Severe Thunderstorm Warning	TOP	Coffey	48 min
Jul 4, 11:03 AM CDT	Special Weather Statement	TOP	Anderson	57 min
Jul 4, 1:05 PM CDT	Special Weather Statement	TOP	Morris	25 min
Jul 4, 3:11 PM CDT	Areal Flood Advisory	TOP	Geary, Riley, Wabaunsee	100 min
Jul 4, 4:04 PM CDT	Flash Flood Warning	TOP	Shawnee, Wabaunsee	61 min
Jul 4, 4:39 PM CDT	Special Weather Statement	TOP	Osage	21 min
Jul 4, 5:23 PM CDT	Special Weather Statement	TOP	Osage	37 min

Nearby

Severe Thunderstorm Warnings in Kansas, 2026 Every severe thunderstorm warning in 2026

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.