Alert archive / Kansas / Severe Thunderstorm Warnings in 2026

Severe Thunderstorm Warning 306, NWS Wichita, KS

June 18, 2026Harper County, Kansas

NWS Wichita, KS issued this severe thunderstorm warning at Jun 18, 2026, 2:08 PM CDT for Harper County, Kansas. It was in force for 52 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: Jun 18, 2026, 2:08 PM CDT (19:08 UTC)
Expired: Jun 18, 2026, 3:00 PM CDT
In force: 52 min
Issued by: NWS Wichita, KS
Area: Storm-based polygon
Hail: 1.0 in
Wind: 50.0 mph

County Harper County, KS

The radar

The Vance AFB radar (KVNX), 50 km from the middle of the area, began a volume at 19:11 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

Norman, OK (KOUN), launched 12:00Z, 7.1 hours before the alert went out and 227 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: 2182 J/kg
Mixed-layer CIN: -220 J/kg
Mixed-layer LCL: 621 m above ground
0-6 km bulk shear: 18 kt
0-1 km storm-relative helicity: 152 m²/s²
0-3 km storm-relative helicity: 199 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.3

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 Wichita, KS wrote its last area forecast discussion before this severe thunderstorm warning went out at Jun 18, 12:26 PM CDT, 1 hour 42 minutes earlier.

Area forecast discussion, Jun 18, 12:26 PM CDT, 1 hour 42 minutes before

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Hazardous weather outlook, Jun 18, 3:22 AM CDT, 10 hours 46 minutes before

Hazardous Weather Outlook
National Weather Service Wichita KS
322 AM CDT Thu Jun 18 2026

KSZ032-033-047>053-067>072-082-083-091>096-098>100-190830-
Russell-Lincoln-Barton-Ellsworth-Saline-Rice-McPherson-Marion-Chase-
Reno-Harvey-Butler-Greenwood-Woodson-Allen-Kingman-Sedgwick-Harper-
Sumner-Cowley-Elk-Wilson-Neosho-Chautauqua-Montgomery-Labette-
322 AM CDT Thu Jun 18 2026

This hazardous weather outlook is for portions of central Kansas,
east central Kansas, south central Kansas and southeast Kansas.

.DAY ONE...Today and Tonight

Scattered showers and thunderstorms are possible today, mainly for
locations along and south of a line extending from Great Bend to
McPherson to Emporia. Some of these storms could produce dime to
half-dollar size hail, heavy rainfall, and localized flooding
concerns.

.DAYS TWO THROUGH SEVEN...Friday through Wednesday

Thunderstorms could develop over the area again late Friday
afternoon and night, however The better chances for more widespread
thunderstorms to impact the region are on Saturday night. The
potential for severe thunderstorms with damaging winds and heavy
rainfall is increasing for this Saturday night period. The
thunderstorms could linger into the morning hours on Sunday. Please
continue to watch for updates as we refine the forecast.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not anticipated today or tonight.

&&

For a graphical version of this information, see our webpage at:
https://www.weather.gov/erh/ghwo?wfo=ict

In the hours before

Local storm report, Jun 18, 9:28 AM CDT, 4 hours 40 minutes before

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Local storm report, Jun 18, 10:27 AM CDT, 3 hours 41 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 18, 5:49 AM CDT	Severe Thunderstorm Warning	ICT	Cowley, Sumner	56 min
Jun 18, 6:39 AM CDT	Severe Thunderstorm Warning	ICT	Butler, Cowley	48 min
Jun 18, 7:02 AM CDT	Severe Thunderstorm Warning	ICT	Butler, Harvey, Sedgwick	21 min
Jun 18, 7:06 AM CDT	Severe Thunderstorm Warning	ICT	Allen, Woodson	28 min
Jun 18, 9:49 AM CDT	Severe Thunderstorm Warning	ICT	Butler	41 min
Jun 18, 11:34 AM CDT	Severe Thunderstorm Warning	ICT	Cowley	41 min
Jun 18, 12:08 PM CDT	Severe Thunderstorm Warning	ICT	Chautauqua, Cowley	20 min
Jun 18, 12:27 PM CDT	Severe Thunderstorm Warning	ICT	Sumner	33 min
Jun 18, 2:54 PM CDT	Severe Thunderstorm Warning	ICT	Harper	37 min
Jun 18, 5:23 PM CDT	Severe Thunderstorm Warning	ICT	Sedgwick, Sumner	37 min
Jun 18, 5:57 PM CDT	Severe Thunderstorm Warning	ICT	Sumner	33 min
Jun 18, 6:14 PM CDT	Severe Thunderstorm Warning	ICT	Sedgwick, Sumner	31 min
Jun 18, 6:29 PM CDT	Severe Thunderstorm Warning	ICT	Cowley, Sumner	31 min
Jun 18, 6:43 PM CDT	Areal Flood Warning	ICT	Kingman, Sedgwick, Sumner	6 hr

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.