Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2026

Severe Thunderstorm Warning 451, NWS Norman, OK

May 18, 2026Greer County, Jackson County, Kiowa County, Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at May 18, 2026, 5:25 PM CDT for Greer County, Jackson County, Kiowa County, Oklahoma. It was in force for 35 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: May 18, 2026, 5:25 PM CDT (22:25 UTC)
Expired: May 18, 2026, 6:00 PM CDT
In force: 35 min
Issued by: NWS Norman, OK
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Greer County, OK, Jackson County, OK, Kiowa County, OK

The radar

The Altus AFB radar (KFDR), 59 km from the middle of the area, began a volume at 22:27 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
May 18, 4:36 PM CDT	Tornado Watch	SPC	4 hr

The nearest sounding before it

Amarillo Airport, TX (KAMA), launched 12:00Z, 10.4 hours before the alert went out and 222 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: 2052 J/kg
Mixed-layer CIN: -122 J/kg
Mixed-layer LCL: 1266 m above ground
0-6 km bulk shear: 28 kt
0-1 km storm-relative helicity: 128 m²/s²
0-3 km storm-relative helicity: 176 m²/s²
Significant tornado parameter: 0.3
Supercell composite: 2.5

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 Norman, OK wrote its last area forecast discussion before this severe thunderstorm warning went out at May 17, 6:23 PM CDT, 23 hours 2 minutes earlier.

Area forecast discussion, May 17, 6:23 PM CDT, 23 hours 2 minutes before

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The office that day

Everything else NWS Norman, OK issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 18, 1:24 AM CDT	Red Flag Warning	OUN	Beckham, Ellis, Greer, Harmon, Harper, Roger Mills	20 hr
May 18, 4:07 PM CDT	Special Weather Statement	OUN	Washita	23 min
May 18, 4:19 PM CDT	Severe Thunderstorm Warning	OUN	Harmon, Jackson	41 min
May 18, 4:30 PM CDT	Special Weather Statement	OUN	Greer	30 min
May 18, 4:41 PM CDT	Severe Thunderstorm Warning	OUN	Custer, Washita	25 min
May 18, 4:52 PM CDT	Severe Thunderstorm Warning	OUN	Greer, Harmon, Jackson, Kiowa	38 min
May 18, 5:07 PM CDT	Special Weather Statement	OUN	Custer	23 min
May 18, 5:26 PM CDT	Special Weather Statement	OUN	Washita	34 min
May 18, 5:57 PM CDT	Severe Thunderstorm Warning	OUN	Beckham, Custer, Roger Mills, Washita	33 min
May 18, 6:00 PM CDT	Special Weather Statement	OUN	Kiowa	30 min
May 18, 6:06 PM CDT	Special Weather Statement	OUN	Jackson	24 min
May 18, 6:13 PM CDT	Special Weather Statement	OUN	Custer	32 min
May 18, 6:27 PM CDT	Special Weather Statement	OUN	Custer	33 min
May 18, 6:30 PM CDT	Special Weather Statement	OUN	Greer, Harmon, Jackson	30 min
May 18, 6:44 PM CDT	Special Weather Statement	OUN	Major	31 min
May 18, 4:06 PM CDT	Special Weather Statement	OUN	Hardeman	24 min
May 18, 5:02 PM CDT	Special Weather Statement	OUN	Hardeman	28 min

Nearby

Severe Thunderstorm Warnings in Oklahoma, 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.