Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 184, NWS Norman, OK

May 18, 20184 counties in Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at May 18, 2018, 11:26 PM CDT for 4 counties in Oklahoma. It was in force for 49 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, 2018, 11:26 PM CDT (04:26 UTC)
Expired: May 19, 2018, 12:15 AM CDT
In force: 49 min
Issued by: NWS Norman, OK
Area: Storm-based polygon
Hail: 1.0 in
Wind: 70.0 mph

Counties Garfield County, OK, Grant County, OK, Kay County, OK, Noble County, OK

The radar

The Vance AFB radar (KVNX), 59 km from the middle of the area, began a volume at 04:28 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 00:00Z, 4.4 hours before the alert went out and 153 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: 1757 J/kg
Mixed-layer CIN: -128 J/kg
Mixed-layer LCL: 1607 m above ground
0-6 km bulk shear: 34 kt
0-1 km storm-relative helicity: 124 m²/s²
0-3 km storm-relative helicity: 244 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 1.9

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, 10:50 PM CDT, 36 minutes earlier.

Area forecast discussion, May 18, 10:50 PM CDT, 36 minutes before

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Hazardous weather outlook, May 18, 11:02 PM CDT, 24 minutes before

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In the hours before

Special weather statement, May 18, 10:42 PM CDT, 44 minutes before

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Special weather statement, May 18, 11:13 PM CDT, 13 minutes before

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Special weather statement, May 18, 11:14 PM CDT, 12 minutes before

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Local storm report, May 18, 11:19 PM CDT, 7 minutes before

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Local storm report, May 18, 11:22 PM CDT, 4 minutes before

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Special weather statement, May 18, 11:24 PM CDT, 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, 7:49 PM CDT	Severe Thunderstorm Warning	OUN	Harper	41 min
May 18, 8:10 PM CDT	Severe Thunderstorm Warning	OUN	Woods, Woodward	65 min
May 18, 8:16 PM CDT	Special Weather Statement	OUN	Beckham	29 min
May 18, 8:41 PM CDT	Severe Thunderstorm Warning	OUN	Beckham, Greer, Harmon	49 min
May 18, 8:49 PM CDT	Special Weather Statement	OUN	Beckham, Roger Mills	41 min
May 18, 9:15 PM CDT	Severe Thunderstorm Warning	OUN	Alfalfa, Woods	45 min
May 18, 9:16 PM CDT	Special Weather Statement	OUN	Custer	29 min
May 18, 9:19 PM CDT	Severe Thunderstorm Warning	OUN	Beckham, Greer, Jackson, Kiowa, Washita	41 min
May 18, 9:59 PM CDT	Severe Thunderstorm Warning	OUN	Kiowa, Washita	46 min
May 18, 10:15 PM CDT	Special Weather Statement	OUN	Alfalfa	30 min
May 18, 10:18 PM CDT	Special Weather Statement	OUN	Custer, Dewey	27 min
May 18, 10:33 PM CDT	Severe Thunderstorm Warning	OUN	Alfalfa, Grant, Woods	42 min
May 18, 10:42 PM CDT	Special Weather Statement	OUN	Garfield	33 min
May 18, 11:13 PM CDT	Special Weather Statement	OUN	Garfield	32 min
May 18, 11:14 PM CDT	Special Weather Statement	OUN	Grant	31 min
May 18, 11:24 PM CDT	Special Weather Statement	OUN	Blaine, Major	36 min
May 19, 12:11 AM CDT	Special Weather Statement	OUN	Kay, Noble	34 min
May 19, 12:48 AM CDT	Special Weather Statement	OUN	Kay	27 min
May 19, 1:25 PM CDT	Special Weather Statement	OUN	Garfield	35 min
May 19, 1:33 PM CDT	Severe Thunderstorm Warning	OUN	Garfield, Kingfisher, Logan, Noble	42 min
May 19, 1:45 PM CDT	Special Weather Statement	OUN	Grant	30 min
May 19, 2:06 PM CDT	Severe Thunderstorm Warning	OUN	Garfield, Kay, Noble	39 min
May 19, 2:08 PM CDT	Severe Thunderstorm Warning	OUN	Grant, Kay	44 min
May 19, 2:36 PM CDT	Special Weather Statement	OUN	Jackson	24 min
May 19, 2:38 PM CDT	Special Weather Statement	OUN	Major	52 min
May 19, 2:42 PM CDT	Severe Thunderstorm Warning	OUN	Greer, Jackson	48 min
May 19, 2:47 PM CDT	Special Weather Statement	OUN	Kay	28 min
May 19, 2:47 PM CDT	Severe Thunderstorm Warning	OUN	Harmon, Jackson	43 min
May 19, 3:09 PM CDT	Severe Thunderstorm Warning	OUN	Blaine, Garfield, Kingfisher, Major	38 min
May 19, 3:12 PM CDT	Areal Flood Advisory	OUN	Harmon, Jackson	3 hr
May 19, 3:22 PM CDT	Severe Thunderstorm Warning	OUN	Jackson	38 min
May 19, 3:24 PM CDT	Severe Thunderstorm Warning	OUN	Greer, Jackson, Kiowa	36 min
May 19, 3:26 PM CDT	Severe Thunderstorm Warning	OUN	Jackson	27 min
May 19, 3:40 PM CDT	Flash Flood Warning	OUN	Harmon, Jackson	6 hr
May 19, 3:46 PM CDT	Special Weather Statement	OUN	Garfield	14 min
May 19, 3:50 PM CDT	Special Weather Statement	OUN	Grant	25 min
May 19, 3:56 PM CDT	Special Weather Statement	OUN	Jackson	34 min
May 19, 3:58 PM CDT	Special Weather Statement	OUN	Kiowa	32 min
May 19, 3:58 PM CDT	Severe Thunderstorm Warning	OUN	Grant, Kay	47 min
May 19, 4:01 PM CDT	Special Weather Statement	OUN	Kiowa	29 min
May 19, 4:31 PM CDT	Special Weather Statement	OUN	Harmon	29 min
May 19, 4:36 PM CDT	Severe Thunderstorm Warning	OUN	Harmon	39 min
May 19, 4:39 PM CDT	Severe Thunderstorm Warning	OUN	Grant, Kay	22 min
May 19, 4:46 PM CDT	Special Weather Statement	OUN	Kiowa	29 min
May 19, 4:56 PM CDT	Special Weather Statement	OUN	Payne	34 min
May 19, 5:02 PM CDT	Areal Flood Advisory	OUN	Harmon, Jackson	3 hr
May 19, 5:13 PM CDT	Severe Thunderstorm Warning	OUN	Harmon, Jackson	47 min
May 19, 5:45 PM CDT	Flash Flood Warning	OUN	Harmon, Jackson	3 hr
May 19, 6:03 PM CDT	Severe Thunderstorm Warning	OUN	Major, Woods, Woodward	42 min
May 19, 6:05 PM CDT	Special Weather Statement	OUN	Dewey	25 min
May 19, 6:09 PM CDT	Severe Thunderstorm Warning	OUN	Jackson	51 min
May 19, 6:23 PM CDT	Special Weather Statement	OUN	Kay	37 min
May 19, 6:24 PM CDT	Special Weather Statement	OUN	Garfield	36 min
May 19, 6:24 PM CDT	Severe Thunderstorm Warning	OUN	Jackson, Tillman	51 min
May 19, 6:26 PM CDT	Special Weather Statement	OUN	Logan	19 min
May 19, 6:40 PM CDT	Severe Thunderstorm Warning	OUN	Woodward	18 min
May 19, 6:40 PM CDT	Severe Thunderstorm Warning	OUN	Alfalfa, Major, Woods	50 min
May 19, 6:43 PM CDT	Severe Thunderstorm Warning	OUN	Garfield	25 min
May 19, 6:53 PM CDT	Tornado Warning	OUN	Major	37 min
May 19, 6:55 PM CDT	Severe Thunderstorm Warning	OUN	Woods	35 min
May 19, 3:15 PM CDT	Severe Thunderstorm Warning	OUN	Foard, Hardeman	45 min
May 19, 3:47 PM CDT	Flash Flood Warning	OUN	Hardeman	6 hr
May 19, 5:04 PM CDT	Special Weather Statement	OUN	Hardeman	26 min
May 19, 5:34 PM CDT	Severe Thunderstorm Warning	OUN	Foard, Hardeman	41 min
May 19, 5:56 PM CDT	Special Weather Statement	OUN	Hardeman	34 min

Nearby

Severe Thunderstorm Warnings in Oklahoma, 2018 Every severe thunderstorm warning in 2018

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.