Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 556, NWS Norman, OK

July 12, 20204 counties in Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at Jul 12, 2020, 1:54 AM CDT for 4 counties in Oklahoma. It was in force for 66 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: Jul 12, 2020, 1:54 AM CDT (06:54 UTC)
Expired: Jul 12, 2020, 3:00 AM CDT
In force: 66 min
Issued by: NWS Norman, OK
Area: Storm-based polygon
Hail: 1.75 in
Wind: 60.0 mph

Counties Blaine County, OK, Kingfisher County, OK, Major County, OK, Woods County, OK

The radar

The Vance AFB radar (KVNX), 64 km from the middle of the area, began a volume at 06:56 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, 6.9 hours before the alert went out and 146 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: 4218 J/kg
Mixed-layer CIN: -66 J/kg
Mixed-layer LCL: 1900 m above ground
0-6 km bulk shear: 38 kt
0-1 km storm-relative helicity: 18 m²/s²
0-3 km storm-relative helicity: 136 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 14.8

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 Jul 12, 1:40 AM CDT, 14 minutes earlier.

Area forecast discussion, Jul 12, 1:40 AM CDT, 14 minutes before

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Hazardous weather outlook, Jul 11, 8:27 PM CDT, 5 hours 27 minutes before

Hazardous Weather Outlook...UPDATED
National Weather Service Norman OK
827 PM CDT Sat Jul 11 2020

OKZ004>048-050>052-TXZ083>090-130130-
Harper-Woods-Alfalfa-Grant-Kay-Ellis-Woodward-Major-Garfield-
Noble-Roger Mills-Dewey-Custer-Blaine-Kingfisher-Logan-Payne-
Beckham-Washita-Caddo-Canadian-Oklahoma-Lincoln-Grady-McClain-
Cleveland-Pottawatomie-Seminole-Hughes-Harmon-Greer-Kiowa-Jackson-
Tillman-Comanche-Stephens-Garvin-Murray-Pontotoc-Coal-Cotton-
Jefferson-Carter-Johnston-Atoka-Love-Marshall-Bryan-Hardeman-
Foard-Wilbarger-Wichita-Knox-Baylor-Archer-Clay-
827 PM CDT Sat Jul 11 2020

This hazardous weather outlook is for portions of northern...
western...central...and southern Oklahoma...and western north
Texas.

.DAY ONE...Saturday evening and overnight...

.Thunderstorms...
There is an Enhanced Risk for severe thunderstorms this evening
across north-central and central Oklahoma, generally northeast of
a line extending from Woodward to Chickasha to Ada to Atoka. This
Enhanced Risk includes Enid, Ponca City, Stillwater, Seminole and
the Oklahoma City metro area.

A Slight Risk extends farther west and south, generally northeast
of a line from Erick to Lawton to Marietta.

Hail to the size of baseballs and wind gusts of 80 mph will be
the main hazards in the Enhanced Risk area, while damaging wind
gusts of 60 to 80 mph and golfball size hail will be the primary
hazard in the slight risk area.

Severe storms will continued to develop and expand over northern
and central Oklahoma this evening. There storms may develop into a
storm complex and move southeast with strong winds and hail.

.SPOTTER AND EMERGENCY MANAGEMENT STATEMENT...

Storm spotter groups and emergency management personnel across
northern Oklahoma should prepare for severe weather operations
this evening and perhaps overnight.

.DAYS TWO THROUGH SEVEN...Sunday through Friday...

.Thunderstorms...
Thunderstorms are possible late Sunday and early Monday and again
late Tuesday and early Wednesday. Most of these would occur across
northern and central Oklahoma.

.Heat...
Very hot conditions will exist Monday and Tuesday.

.Fire Weather...
Elevated fire weather conditions will occur Monday and Tuesday in
western Oklahoma and adjacent parts of northern Texas.

Get graphics and more details at weather.gov/norman...and follow
our weather forecast office on Twitter and Facebook.

In the hours before

Local storm report, Jul 12, 1:10 AM CDT, 44 minutes before

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Local storm report, Jul 12, 1:16 AM CDT, 38 minutes before

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Special weather statement, Jul 12, 1:18 AM CDT, 36 minutes before

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Local storm report, Jul 12, 1:22 AM CDT, 32 minutes before

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Special weather statement, Jul 12, 1:30 AM CDT, 24 minutes before

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Local storm report, Jul 12, 1:43 AM CDT, 11 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
Jul 11, 7:09 PM CDT	Severe Thunderstorm Warning	OUN	Garfield, Logan, Noble	36 min
Jul 11, 7:22 PM CDT	Severe Thunderstorm Warning	OUN	Ellis, Harper, Woodward	38 min
Jul 11, 7:24 PM CDT	Special Weather Statement	OUN	Major	21 min
Jul 11, 7:27 PM CDT	Severe Thunderstorm Warning	OUN	Blaine, Major, Woods	48 min
Jul 11, 7:29 PM CDT	Severe Thunderstorm Warning	OUN	Garfield, Kingfisher, Logan, Major	31 min
Jul 11, 7:29 PM CDT	Severe Thunderstorm Warning	OUN	Major, Woods, Woodward	46 min
Jul 11, 7:43 PM CDT	Severe Thunderstorm Warning	OUN	Garfield, Logan, Noble, Payne	32 min
Jul 11, 7:59 PM CDT	Severe Thunderstorm Warning	OUN	Ellis, Harper, Woodward	31 min
Jul 11, 8:06 PM CDT	Severe Thunderstorm Warning	OUN	Ellis, Harper	39 min
Jul 11, 8:08 PM CDT	Severe Thunderstorm Warning	OUN	Garfield, Noble, Payne	52 min
Jul 11, 8:11 PM CDT	Severe Thunderstorm Warning	OUN	Major, Woods, Woodward	49 min
Jul 11, 8:13 PM CDT	Severe Thunderstorm Warning	OUN	Blaine, Garfield, Kingfisher, Major	20 min
Jul 11, 8:24 PM CDT	Severe Thunderstorm Warning	OUN	Garfield, Grant, Kay, Noble	51 min
Jul 11, 8:29 PM CDT	Severe Thunderstorm Warning	OUN	Harper, Woods, Woodward	46 min
Jul 11, 8:36 PM CDT	Severe Thunderstorm Warning	OUN	Garfield, Grant, Kay, Noble	24 min
Jul 11, 8:41 PM CDT	Severe Thunderstorm Warning	OUN	Alfalfa, Major, Woods	49 min
Jul 11, 8:44 PM CDT	Severe Thunderstorm Warning	OUN	Harper	46 min
Jul 11, 8:49 PM CDT	Severe Thunderstorm Warning	OUN	Grant	26 min
Jul 11, 8:51 PM CDT	Severe Thunderstorm Warning	OUN	Kay, Noble	24 min
Jul 11, 8:57 PM CDT	Severe Thunderstorm Warning	OUN	Woods	48 min
Jul 11, 9:00 PM CDT	Severe Thunderstorm Warning	OUN	Garfield, Grant, Kay, Noble	45 min
Jul 11, 9:05 PM CDT	Areal Flood Advisory	OUN	Woods, Woodward	3 hr
Jul 11, 9:10 PM CDT	Severe Thunderstorm Warning	OUN	Noble	50 min
Jul 11, 9:13 PM CDT	Severe Thunderstorm Warning	OUN	Garfield, Grant	32 min
Jul 11, 9:15 PM CDT	Severe Thunderstorm Warning	OUN	Garfield, Grant	30 min
Jul 11, 9:25 PM CDT	Severe Thunderstorm Warning	OUN	Garfield, Noble	50 min
Jul 11, 9:29 PM CDT	Severe Thunderstorm Warning	OUN	Harper, Woods	46 min
Jul 11, 9:38 PM CDT	Severe Thunderstorm Warning	OUN	Alfalfa, Woods	67 min
Jul 11, 9:43 PM CDT	Severe Thunderstorm Warning	OUN	Garfield, Grant	48 min
Jul 11, 9:51 PM CDT	Severe Thunderstorm Warning	OUN	Kay	53 min
Jul 11, 10:01 PM CDT	Severe Thunderstorm Warning	OUN	Noble	59 min
Jul 11, 10:05 PM CDT	Severe Thunderstorm Warning	OUN	Woods	40 min
Jul 11, 10:10 PM CDT	Severe Thunderstorm Warning	OUN	Payne	65 min
Jul 11, 10:16 PM CDT	Special Weather Statement	OUN	Major	29 min
Jul 11, 10:20 PM CDT	Severe Thunderstorm Warning	OUN	Blaine	40 min
Jul 11, 10:48 PM CDT	Special Weather Statement	OUN	Alfalfa	27 min
Jul 11, 11:00 PM CDT	Special Weather Statement	OUN	Canadian	30 min
Jul 11, 11:02 PM CDT	Special Weather Statement	OUN	Lincoln	28 min
Jul 11, 11:11 PM CDT	Special Weather Statement	OUN	Alfalfa	34 min
Jul 11, 11:14 PM CDT	Severe Thunderstorm Warning	OUN	Canadian, Grady, Kingfisher	31 min
Jul 11, 11:33 PM CDT	Severe Thunderstorm Warning	OUN	Canadian, Cleveland, Grady, McClain, Oklahoma	57 min
Jul 11, 11:36 PM CDT	Special Weather Statement	OUN	Lincoln, Pottawatomie, Seminole	39 min
Jul 11, 11:45 PM CDT	Special Weather Statement	OUN	Atoka	45 min
Jul 11, 11:50 PM CDT	Severe Thunderstorm Warning	OUN	Caddo, Grady, McClain	25 min
Jul 12, 12:06 AM CDT	Severe Thunderstorm Warning	OUN	Cleveland, Garvin, Grady, McClain, Murray, Oklahoma and 3 more	39 min
Jul 12, 12:37 AM CDT	Severe Thunderstorm Warning	OUN	Caddo, Carter, Comanche, Cotton, Garvin, Grady and 2 more	38 min
Jul 12, 12:41 AM CDT	Severe Thunderstorm Warning	OUN	Carter, Cleveland, Coal, Garvin, Hughes, Johnston and 5 more	49 min
Jul 12, 1:15 AM CDT	Severe Thunderstorm Warning	OUN	Blaine, Major, Woods	45 min
Jul 12, 1:18 AM CDT	Special Weather Statement	OUN	Cotton, Jackson, Stephens, Tillman	27 min
Jul 12, 1:20 AM CDT	Severe Thunderstorm Warning	OUN	Atoka, Bryan, Carter, Coal, Hughes, Johnston and 4 more	55 min
Jul 12, 1:30 AM CDT	Special Weather Statement	OUN	Kingfisher, Oklahoma	45 min
Jul 12, 1:37 AM CDT	Severe Thunderstorm Warning	OUN	Canadian, Kingfisher, Logan, Oklahoma	38 min
Jul 12, 1:44 AM CDT	Severe Thunderstorm Warning	OUN	Carter, Jefferson, Love	61 min
Jul 12, 1:59 AM CDT	Special Weather Statement	OUN	Comanche	31 min
Jul 12, 2:11 AM CDT	Severe Thunderstorm Warning	OUN	Atoka, Bryan, Carter, Johnston, Love, Marshall	49 min
Jul 12, 2:14 AM CDT	Severe Thunderstorm Warning	OUN	Oklahoma	46 min
Jul 12, 2:18 AM CDT	Severe Thunderstorm Warning	OUN	Blaine, Canadian, Kingfisher	42 min
Jul 12, 2:22 AM CDT	Severe Thunderstorm Warning	OUN	Caddo, Comanche	53 min
Jul 12, 2:41 AM CDT	Severe Thunderstorm Warning	OUN	Canadian, Cleveland, Grady, McClain, Oklahoma	31 min
Jul 12, 2:55 AM CDT	Severe Thunderstorm Warning	OUN	Blaine, Kingfisher	18 min
Jul 12, 2:56 AM CDT	Special Weather Statement	OUN	Bryan	49 min
Jul 12, 3:05 AM CDT	Special Weather Statement	OUN	Cleveland	25 min
Jul 12, 3:16 AM CDT	Special Weather Statement	OUN	Grady	29 min
Jul 12, 3:21 AM CDT	Special Weather Statement	OUN	Grady	24 min
Jul 12, 3:52 AM CDT	Special Weather Statement	OUN	Jefferson, Stephens	23 min
Jul 12, 4:06 AM CDT	Special Weather Statement	OUN	Carter, Garvin, Jefferson, Murray	39 min
Jul 12, 5:36 AM CDT	Special Weather Statement	OUN	Jackson, Tillman	54 min

Nearby

Severe Thunderstorm Warnings in Oklahoma, 2020 Every severe thunderstorm warning in 2020

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.