Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 285, NWS Norman, OK

May 30, 20184 counties in Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at May 30, 2018, 12:09 AM CDT for 4 counties in Oklahoma. It was in force for 37 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 30, 2018, 12:09 AM CDT (05:09 UTC)
Expired: May 30, 2018, 12:46 AM CDT
In force: 37 min
Issued by: NWS Norman, OK
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Lincoln County, OK, Logan County, OK, Noble County, OK, Payne County, OK

The radar

The Norman radar (KTLX), 78 km from the middle of the area, began a volume at 05:09 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 29, 9:32 PM CDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Norman, OK (KOUN), launched 00:00Z, 5.2 hours before the alert went out and 92 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: 1076 J/kg
Mixed-layer CIN: -57 J/kg
Mixed-layer LCL: 1542 m above ground
0-6 km bulk shear: 42 kt
0-1 km storm-relative helicity: -7 m²/s²
0-3 km storm-relative helicity: 119 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

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 29, 10:54 PM CDT, 1 hour 15 minutes earlier.

Area forecast discussion, May 29, 10:54 PM CDT, 1 hour 15 minutes before

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Hazardous weather outlook, May 29, 11:34 PM CDT, 35 minutes before

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In the hours before

Local storm report, May 29, 11:31 PM CDT, 38 minutes before

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Special weather statement, May 29, 11:34 PM CDT, 35 minutes before

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Local storm report, May 29, 11:52 PM CDT, 17 minutes before

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Local storm report, May 29, 11:59 PM CDT, 10 minutes before

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Special weather statement, May 30, 12:00 AM CDT, 9 minutes before

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Local storm report, May 30, 12:06 AM CDT, 3 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 29, 7:24 PM CDT	Tornado Warning	OUN	Woods	36 min
May 29, 7:27 PM CDT	Severe Thunderstorm Warning	OUN	Beckham, Roger Mills	48 min
May 29, 7:43 PM CDT	Severe Thunderstorm Warning	OUN	Alfalfa, Major, Woods	47 min
May 29, 7:51 PM CDT	Severe Thunderstorm Warning	OUN	Woods, Woodward	39 min
May 29, 7:57 PM CDT	Tornado Warning	OUN	Beckham, Greer	37 min
May 29, 8:01 PM CDT	Areal Flood Advisory	OUN	Beckham	3 hr
May 29, 8:15 PM CDT	Severe Thunderstorm Warning	OUN	Beckham, Greer, Kiowa, Washita	45 min
May 29, 8:21 PM CDT	Severe Thunderstorm Warning	OUN	Alfalfa, Garfield, Grant, Major, Woods	39 min
May 29, 8:24 PM CDT	Severe Thunderstorm Warning	OUN	Woods	51 min
May 29, 8:41 PM CDT	Severe Thunderstorm Warning	OUN	Woodward	49 min
May 29, 8:54 PM CDT	Severe Thunderstorm Warning	OUN	Beckham, Kiowa, Roger Mills, Washita	51 min
May 29, 8:56 PM CDT	Severe Thunderstorm Warning	OUN	Garfield, Major	49 min
May 29, 9:06 PM CDT	Severe Thunderstorm Warning	OUN	Grant, Kay	39 min
May 29, 9:09 PM CDT	Areal Flood Advisory	OUN	Woods	3 hr
May 29, 9:11 PM CDT	Severe Thunderstorm Warning	OUN	Alfalfa, Woods	49 min
May 29, 9:26 PM CDT	Severe Thunderstorm Warning	OUN	Major, Woods, Woodward	49 min
May 29, 9:37 PM CDT	Severe Thunderstorm Warning	OUN	Grant, Kay	38 min
May 29, 9:41 PM CDT	Severe Thunderstorm Warning	OUN	Kiowa, Washita	49 min
May 29, 9:41 PM CDT	Severe Thunderstorm Warning	OUN	Garfield	49 min
May 29, 9:43 PM CDT	Severe Thunderstorm Warning	OUN	Beckham	47 min
May 29, 10:10 PM CDT	Severe Thunderstorm Warning	OUN	Major, Woods	15 min
May 29, 10:12 PM CDT	Severe Thunderstorm Warning	OUN	Kay	33 min
May 29, 10:18 PM CDT	Severe Thunderstorm Warning	OUN	Caddo, Comanche, Kiowa	42 min
May 29, 10:30 PM CDT	Severe Thunderstorm Warning	OUN	Alfalfa, Garfield, Grant, Major	45 min
May 29, 11:00 PM CDT	Severe Thunderstorm Warning	OUN	Comanche	45 min
May 29, 11:00 PM CDT	Severe Thunderstorm Warning	OUN	Alfalfa, Garfield, Grant, Major	45 min
May 29, 11:18 PM CDT	Special Weather Statement	OUN	Payne	42 min
May 29, 11:23 PM CDT	Areal Flood Advisory	OUN	Garfield	67 min
May 29, 11:29 PM CDT	Special Weather Statement	OUN	Noble	46 min
May 29, 11:34 PM CDT	Special Weather Statement	OUN	Lincoln	41 min
May 29, 11:37 PM CDT	Severe Thunderstorm Warning	OUN	Payne	38 min
May 29, 11:42 PM CDT	Severe Thunderstorm Warning	OUN	Garfield, Logan, Noble, Payne	48 min
May 29, 11:54 PM CDT	Severe Thunderstorm Warning	OUN	Comanche, Grady, Stephens	51 min
May 30, 12:00 AM CDT	Special Weather Statement	OUN	Logan	30 min
May 30, 12:12 AM CDT	Special Weather Statement	OUN	Hughes, Seminole	33 min
May 30, 12:29 AM CDT	Special Weather Statement	OUN	Lincoln	31 min
May 30, 12:33 AM CDT	Severe Thunderstorm Warning	OUN	Carter, Garvin, Grady, Murray, Stephens	42 min
May 30, 12:49 AM CDT	Special Weather Statement	OUN	Lincoln	26 min
May 30, 1:04 AM CDT	Special Weather Statement	OUN	Grady	41 min
May 30, 1:07 AM CDT	Severe Thunderstorm Warning	OUN	Carter, Garvin, Jefferson, Murray, Stephens	52 min
May 30, 1:16 AM CDT	Special Weather Statement	OUN	Stephens	44 min
May 30, 1:45 AM CDT	Special Weather Statement	OUN	Johnston, Marshall	45 min
May 30, 1:58 AM CDT	Special Weather Statement	OUN	Carter	47 min
May 30, 2:12 AM CDT	Special Weather Statement	OUN	McClain	33 min
May 30, 2:35 AM CDT	Special Weather Statement	OUN	Bryan, Marshall	55 min
May 30, 3:55 AM CDT	Special Weather Statement	OUN	Bryan	35 min
May 30, 3:59 AM CDT	Special Weather Statement	OUN	Johnston	31 min
May 30, 4:32 AM CDT	Special Weather Statement	OUN	Johnston, Murray	43 min
May 30, 4:55 AM CDT	Special Weather Statement	OUN	Murray	50 min
May 30, 5:15 AM CDT	Special Weather Statement	OUN	Johnston	60 min
May 30, 5:57 AM CDT	Special Weather Statement	OUN	Bryan	48 min
May 30, 6:16 AM CDT	Special Weather Statement	OUN	Bryan	44 min
May 30, 6:18 AM CDT	Special Weather Statement	OUN	Johnston	42 min
May 30, 6:30 AM CDT	Severe Thunderstorm Warning	OUN	Bryan, Johnston	45 min
May 30, 6:44 AM CDT	Areal Flood Advisory	OUN	Bryan	3 hr
May 30, 7:14 AM CDT	Special Weather Statement	OUN	Bryan	31 min
May 30, 2:40 PM CDT	River Flood Warning	OUN	Major, Woods, Woodward	10 hr
May 30, 4:12 PM CDT	Heat Advisory	OUN	Cotton, Harmon, Jackson, Tillman	29 hr

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.