Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2026

Severe Thunderstorm Warning 421, NWS Norman, OK

May 9, 2026Caddo County, Comanche County, Grady County, Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at May 9, 2026, 8:45 PM CDT for Caddo County, Comanche County, Grady County, Oklahoma. It was in force for 45 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 9, 2026, 8:45 PM CDT (01:45 UTC)
Expired: May 9, 2026, 9:30 PM CDT
In force: 45 min
Issued by: NWS Norman, OK
Area: Storm-based polygon
Damage threat: Considerable
Hail: 1.75 in
Wind: 60.0 mph

Counties Caddo County, OK, Comanche County, OK, Grady County, OK

The radar

The Altus AFB radar (KFDR), 94 km from the middle of the area, began a volume at 01:48 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 9, 3:59 PM CDT	Severe Thunderstorm Watch	SPC	8 hr

The nearest sounding before it

Norman, OK (KOUN), launched 00:00Z, 1.8 hours before the alert went out and 82 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: 143 J/kg
Mixed-layer CIN: -211 J/kg
Mixed-layer LCL: 2105 m above ground
0-6 km bulk shear: 48 kt
0-1 km storm-relative helicity: 6 m²/s²
0-3 km storm-relative helicity: 172 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.2

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 9, 6:44 PM CDT, 2 hours 1 minute earlier.

Area forecast discussion, May 9, 6:44 PM CDT, 2 hours 1 minute before

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In the hours before

Special weather statement, May 9, 8:15 PM CDT, 30 minutes before

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Local storm report, May 9, 8:17 PM CDT, 28 minutes before

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Local storm report, May 9, 8:25 PM CDT, 20 minutes before

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Special weather statement, May 9, 8:26 PM CDT, 19 minutes before

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Local storm report, May 9, 8:40 PM CDT, 5 minutes before

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Local storm report, May 9, 8:44 PM CDT, 1 minute 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 9, 7:11 PM CDT	Special Weather Statement	OUN	Caddo	34 min
May 9, 7:13 PM CDT	Severe Thunderstorm Warning	OUN	Ellis, Harper, Woods, Woodward	47 min
May 9, 7:24 PM CDT	Severe Thunderstorm Warning Considerable damage threat	OUN	Caddo, Kiowa, Washita	51 min
May 9, 7:34 PM CDT	Special Weather Statement	OUN	Canadian	26 min
May 9, 7:39 PM CDT	Severe Thunderstorm Warning Considerable damage threat	OUN	Beckham, Greer, Roger Mills, Washita	51 min
May 9, 7:49 PM CDT	Severe Thunderstorm Warning	OUN	Alfalfa, Ellis, Harper, Major, Woods, Woodward	41 min
May 9, 7:50 PM CDT	Severe Thunderstorm Warning Considerable damage threat	OUN	Caddo, Kiowa, Washita	25 min
May 9, 7:51 PM CDT	Severe Thunderstorm Warning Considerable damage threat	OUN	Ellis, Roger Mills	39 min
May 9, 8:07 PM CDT	Severe Thunderstorm Warning Considerable damage threat	OUN	Caddo, Comanche, Kiowa, Washita	38 min
May 9, 8:12 PM CDT	Special Weather Statement	OUN	Grady, McClain	33 min
May 9, 8:15 PM CDT	Special Weather Statement	OUN	Caddo	45 min
May 9, 8:22 PM CDT	Severe Thunderstorm Warning Considerable damage threat	OUN	Beckham, Greer, Kiowa, Washita	53 min
May 9, 8:26 PM CDT	Special Weather Statement	OUN	Cotton	34 min
May 9, 8:27 PM CDT	Severe Thunderstorm Warning	OUN	Alfalfa, Custer, Dewey, Ellis, Grant, Major and 3 more	48 min
May 9, 8:37 PM CDT	Severe Thunderstorm Warning	OUN	Caddo, Comanche, Grady, McClain, Stephens	38 min
May 9, 8:48 PM CDT	Severe Thunderstorm Warning Considerable damage threat	OUN	Kiowa, Washita	42 min
May 9, 9:09 PM CDT	Special Weather Statement	OUN	Grady	36 min
May 9, 9:11 PM CDT	Special Weather Statement	OUN	Garvin	34 min
May 9, 9:13 PM CDT	Severe Thunderstorm Warning	OUN	Alfalfa, Blaine, Dewey, Garfield, Grant, Kay and 3 more	47 min
May 9, 9:22 PM CDT	Severe Thunderstorm Warning Considerable damage threat	OUN	Caddo, Comanche, Grady, Stephens	38 min
May 9, 9:23 PM CDT	Special Weather Statement	OUN	Washita	37 min
May 9, 9:42 PM CDT	Special Weather Statement	OUN	Cotton	33 min
May 9, 9:53 PM CDT	Severe Thunderstorm Warning	OUN	Carter, Comanche, Cotton, Garvin, Grady, Jefferson and 2 more	52 min
May 9, 9:55 PM CDT	Severe Thunderstorm Warning	OUN	Custer, Dewey	50 min
May 9, 9:56 PM CDT	Special Weather Statement	OUN	Caddo	34 min
May 9, 9:58 PM CDT	Special Weather Statement	OUN	Garfield, Kingfisher	32 min
May 9, 10:18 PM CDT	Special Weather Statement	OUN	Caddo, Canadian, Oklahoma	27 min
May 9, 10:20 PM CDT	Special Weather Statement	OUN	Roger Mills	25 min
May 9, 10:23 PM CDT	Severe Thunderstorm Warning	OUN	Caddo, Grady	52 min
May 9, 10:28 PM CDT	Special Weather Statement	OUN	Garfield, Kingfisher, Logan, Noble	47 min
May 9, 10:36 PM CDT	Severe Thunderstorm Warning	OUN	Carter, Cotton, Jefferson, Love, Stephens	39 min
May 9, 10:48 PM CDT	Special Weather Statement	OUN	Roger Mills	27 min
May 9, 10:53 PM CDT	Special Weather Statement	OUN	Cleveland, Grady, McClain, Oklahoma	37 min
May 9, 11:03 PM CDT	Severe Thunderstorm Warning	OUN	Carter, Jefferson, Love, Marshall	42 min
May 9, 11:17 PM CDT	Special Weather Statement	OUN	Lincoln, Logan, Payne	28 min
May 9, 11:29 PM CDT	Special Weather Statement	OUN	Grady	31 min
May 9, 11:35 PM CDT	Special Weather Statement	OUN	Cleveland, McClain, Oklahoma, Pottawatomie, Seminole	40 min
May 9, 11:38 PM CDT	Special Weather Statement	OUN	Love, Marshall	37 min
May 9, 11:45 PM CDT	Special Weather Statement	OUN	Lincoln, Logan, Oklahoma, Payne	45 min
May 9, 11:52 PM CDT	Special Weather Statement	OUN	Cotton, Garvin, Grady, McClain, Murray, Stephens	53 min
May 10, 12:20 AM CDT	Special Weather Statement	OUN	Caddo	55 min
May 10, 12:36 AM CDT	Special Weather Statement	OUN	Carter, Jefferson, Love, Stephens	54 min
May 10, 12:59 AM CDT	Severe Thunderstorm Warning	OUN	Caddo, Canadian, Grady	31 min
May 10, 1:05 AM CDT	Special Weather Statement	OUN	Bryan	25 min
May 10, 1:28 AM CDT	Severe Thunderstorm Warning	OUN	Grady, McClain	32 min
May 10, 1:47 AM CDT	Special Weather Statement	OUN	Canadian	28 min
May 10, 1:55 AM CDT	Special Weather Statement	OUN	Grady	35 min
May 10, 2:00 AM CDT	Severe Thunderstorm Warning	OUN	Canadian, Grady	45 min
May 10, 2:19 AM CDT	Areal Flood Advisory	OUN	Grady	3 hr
May 10, 2:42 AM CDT	Severe Thunderstorm Warning	OUN	Canadian, Cleveland, Grady, McClain	26 min
May 10, 3:34 AM CDT	Special Weather Statement	OUN	Harper	26 min
May 10, 3:35 AM CDT	Special Weather Statement	OUN	Grady	25 min
May 10, 3:39 AM CDT	Severe Thunderstorm Warning	OUN	Cleveland, Grady, McClain	29 min
May 10, 4:11 AM CDT	Special Weather Statement	OUN	McClain	34 min
May 10, 4:50 AM CDT	Special Weather Statement	OUN	McClain	25 min
May 10, 5:11 AM CDT	Severe Thunderstorm Warning	OUN	Cleveland, Garvin, McClain	14 min
May 10, 6:05 AM CDT	Special Weather Statement	OUN	Oklahoma	25 min
May 10, 6:12 AM CDT	Special Weather Statement	OUN	Pottawatomie	33 min
May 10, 6:23 AM CDT	Areal Flood Advisory	OUN	Canadian, Oklahoma	3 hr
May 10, 6:29 AM CDT	Special Weather Statement	OUN	Oklahoma	31 min
May 10, 6:40 AM CDT	Special Weather Statement	OUN	Grady	35 min
May 10, 6:53 AM CDT	Special Weather Statement	OUN	Pontotoc	37 min
May 10, 7:09 AM CDT	Flash Flood Warning	OUN	Oklahoma	116 min
May 10, 7:19 AM CDT	Special Weather Statement	OUN	McClain	26 min
May 10, 7:22 AM CDT	Special Weather Statement	OUN	Pontotoc	23 min
May 10, 8:42 AM CDT	Special Weather Statement	OUN	Murray	33 min
May 10, 9:32 AM CDT	Special Weather Statement	OUN	Love, Marshall	43 min
May 10, 1:19 PM CDT	Special Weather Statement	OUN	Archer	26 min
May 10, 1:38 PM CDT	Severe Thunderstorm Warning	OUN	Archer, Baylor	39 min
May 10, 2:01 PM CDT	Special Weather Statement	OUN	Wichita	29 min
May 10, 2:28 PM CDT	Special Weather Statement	OUN	Archer	32 min
May 10, 3:39 PM CDT	Special Weather Statement	OUN	Foard	36 min
May 10, 4:04 PM CDT	Special Weather Statement	OUN	Knox	41 min
May 10, 4:28 PM CDT	Special Weather Statement	OUN	Baylor	47 min
May 10, 4:34 PM CDT	Severe Thunderstorm Warning	OUN	Baylor, Knox	26 min
May 10, 4:57 PM CDT	Special Weather Statement	OUN	Baylor, Knox	48 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.