Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2025

Severe Thunderstorm Warning 331, NWS Norman, OK

May 18, 20255 counties in Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at May 18, 2025, 1:52 AM CDT for 5 counties in Oklahoma. It was in force for 38 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, 2025, 1:52 AM CDT (06:52 UTC)
Expired: May 18, 2025, 2:30 AM CDT
In force: 38 min
Issued by: NWS Norman, OK
Area: Storm-based polygon
Damage threat: Considerable
Hail: 1.0 in
Wind: 70.0 mph

Counties Cleveland County, OK, Lincoln County, OK, Oklahoma County, OK, Pottawatomie County, OK, Seminole County, OK

The radar

The Norman radar (KTLX), 22 km from the middle of the area, began a volume at 06:57 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 watch it was issued in

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

Issued	Product	Office	Lasted
May 17, 9:54 PM CDT	Severe Thunderstorm Watch	SPC	8 hr

The nearest sounding before it

Norman, OK (KOUN), launched 00:00Z, 6.9 hours before the alert went out and 37 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: 250 J/kg
Mixed-layer CIN: -259 J/kg
Mixed-layer LCL: 1896 m above ground
0-6 km bulk shear: 56 kt
0-1 km storm-relative helicity: 82 m²/s²
0-3 km storm-relative helicity: 243 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 Norman, OK wrote its last area forecast discussion before this severe thunderstorm warning went out at May 18, 12:23 AM CDT, 1 hour 29 minutes earlier.

Area forecast discussion, May 18, 12:23 AM CDT, 1 hour 29 minutes before

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In the hours before

Special weather statement, May 17, 11:24 PM CDT, 2 hours 28 minutes before

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Special weather statement, May 18, 12:27 AM CDT, 1 hour 25 minutes before

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Special weather statement, May 18, 12:50 AM CDT, 1 hour 2 minutes before

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Local storm report, May 18, 1:09 AM CDT, 43 minutes before

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Local storm report, May 18, 1:15 AM CDT, 37 minutes before

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Local storm report, May 18, 1:37 AM CDT, 15 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 17, 7:01 PM CDT	Areal Flood Advisory	OUN	Pontotoc, Pottawatomie, Seminole	3 hr
May 17, 7:03 PM CDT	Severe Thunderstorm Warning Considerable damage threat	OUN	Atoka, Coal, Hughes, Pontotoc	42 min
May 17, 7:05 PM CDT	Special Weather Statement	OUN	Bryan, Johnston, Marshall	25 min
May 17, 7:23 PM CDT	Severe Thunderstorm Warning	OUN	Atoka, Bryan, Johnston, Marshall, Pontotoc	52 min
May 17, 7:35 PM CDT	Severe Thunderstorm Warning	OUN	Atoka, Bryan	40 min
May 17, 7:42 PM CDT	Severe Thunderstorm Warning Considerable damage threat	OUN	Atoka, Coal	48 min
May 17, 7:56 PM CDT	Severe Thunderstorm Warning	OUN	Coal, Johnston, Pontotoc	49 min
May 17, 8:27 PM CDT	Severe Thunderstorm Warning	OUN	Atoka	33 min
May 17, 8:45 PM CDT	Special Weather Statement	OUN	Woodward	30 min
May 17, 8:51 PM CDT	Severe Thunderstorm Warning	OUN	Hughes, Pontotoc, Pottawatomie, Seminole	39 min
May 17, 9:25 PM CDT	Special Weather Statement	OUN	Logan, Oklahoma	35 min
May 17, 9:29 PM CDT	Severe Thunderstorm Warning	OUN	Canadian, Oklahoma	31 min
May 17, 9:32 PM CDT	Severe Thunderstorm Warning	OUN	Hughes, Seminole	13 min
May 17, 9:44 PM CDT	Severe Thunderstorm Warning	OUN	Cleveland, Oklahoma	46 min
May 17, 9:53 PM CDT	Severe Thunderstorm Warning	OUN	Lincoln, Logan, Oklahoma	28 min
May 17, 10:08 PM CDT	Severe Thunderstorm Warning	OUN	Cleveland, Oklahoma, Pottawatomie	52 min
May 17, 10:44 PM CDT	Severe Thunderstorm Warning Considerable damage threat	OUN	Pottawatomie, Seminole	46 min
May 17, 10:46 PM CDT	Severe Thunderstorm Warning	OUN	Blaine, Kingfisher	44 min
May 17, 10:54 PM CDT	Severe Thunderstorm Warning	OUN	Custer, Washita	51 min
May 17, 11:16 PM CDT	Severe Thunderstorm Warning	OUN	Hughes, Seminole	44 min
May 17, 11:24 PM CDT	Special Weather Statement	OUN	Payne	36 min
May 17, 11:26 PM CDT	Severe Thunderstorm Warning	OUN	Blaine, Caddo, Canadian, Kingfisher	49 min
May 17, 11:28 PM CDT	Flash Flood Warning	OUN	Custer, Washita	2 hr
May 17, 11:43 PM CDT	Severe Thunderstorm Warning Considerable damage threat	OUN	Garfield	37 min
May 17, 11:46 PM CDT	Severe Thunderstorm Warning	OUN	Lincoln, Logan, Payne	44 min
May 17, 11:46 PM CDT	Severe Thunderstorm Warning	OUN	Blaine	17 min
May 18, 12:13 AM CDT	Severe Thunderstorm Warning	OUN	Canadian, Kingfisher	47 min
May 18, 12:27 AM CDT	Special Weather Statement	OUN	Payne	33 min
May 18, 12:50 AM CDT	Special Weather Statement	OUN	Oklahoma	25 min
May 18, 1:18 AM CDT	Severe Thunderstorm Warning	OUN	Cleveland, Lincoln, Oklahoma, Pottawatomie	27 min
May 18, 1:28 AM CDT	Severe Thunderstorm Warning	OUN	Cleveland, Lincoln, Oklahoma, Pottawatomie	32 min
May 18, 2:27 AM CDT	Severe Thunderstorm Warning	OUN	Hughes, Lincoln, Pottawatomie, Seminole	48 min
May 18, 2:58 AM CDT	Severe Thunderstorm Warning	OUN	Hughes, Seminole	47 min
May 18, 4:45 PM CDT	Special Weather Statement	OUN	Ellis	45 min
May 18, 4:53 PM CDT	Severe Thunderstorm Warning	OUN	Ellis, Harper	52 min
May 18, 4:57 PM CDT	Severe Thunderstorm Warning	OUN	Ellis, Roger Mills, Woodward	48 min
May 18, 5:09 PM CDT	Tornado Warning	OUN	Ellis, Roger Mills	36 min
May 18, 5:36 PM CDT	Severe Thunderstorm Warning Considerable damage threat	OUN	Harper	24 min
May 18, 5:40 PM CDT	Tornado Warning	OUN	Ellis, Woodward	35 min
May 18, 6:09 PM CDT	Tornado Warning	OUN	Ellis, Woodward	51 min
May 18, 6:34 PM CDT	Severe Thunderstorm Warning Destructive damage threat	OUN	Ellis, Woodward	41 min
May 18, 6:59 PM CDT	Special Weather Statement	OUN	Woodward	31 min
May 18, 5:32 PM CDT	Severe Thunderstorm Warning Considerable damage threat	OUN	Archer, Baylor	23 min

Nearby

Severe Thunderstorm Warnings in Oklahoma, 2025 Every severe thunderstorm warning in 2025

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.