Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 314, NWS Norman, OK

May 22, 2020Harper County, Woods County, Woodward County, Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at May 22, 2020, 1:51 AM CDT for Harper County, Woods County, Woodward County, Oklahoma. It was in force for 39 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 22, 2020, 1:51 AM CDT (06:51 UTC)
Expired: May 22, 2020, 2:30 AM CDT
In force: 39 min
Issued by: NWS Norman, OK
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Harper County, OK, Woods County, OK, Woodward County, OK

The radar

The Vance AFB radar (KVNX), 102 km from the middle of the area, began a volume at 06:50 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 21, 9:49 PM CDT	Severe Thunderstorm Watch	SPC	8 hr

The nearest sounding before it

Dodge City, (KDDC), launched 00:00Z, 6.9 hours before the alert went out and 136 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: 1349 J/kg
Mixed-layer CIN: -21 J/kg
Mixed-layer LCL: 1147 m above ground
0-6 km bulk shear: 37 kt
0-1 km storm-relative helicity: 83 m²/s²
0-3 km storm-relative helicity: 173 m²/s²
Significant tornado parameter: 0.9
Supercell composite: 8.0

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 21, 10:51 PM CDT, 3 hours earlier.

Area forecast discussion, May 21, 10:51 PM CDT, 3 hours before

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Hazardous weather outlook, May 21, 3:52 PM CDT, 9 hours 59 minutes before

Hazardous Weather Outlook...UPDATED
National Weather Service Norman OK
352 PM CDT Thu May 21 2020

OKZ004>048-050>052-TXZ083>090-222100-
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-
352 PM CDT Thu May 21 2020

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

.DAY ONE...Tonight...

.Thunderstorms...
There is a risk of severe thunderstorms tonight. The greatest
risk of severe storms will be across northern Oklahoma.

Thunderstorms moving southeast from the High Plains are expected
to move into northwest Oklahoma later this evening into the
overnight. Hail up to the size up golf balls and wind gusts up to
75 mph are the primary hazards. Heavy rainfall may also lead to
localized flooding.

Storms are expected to continue into the early morning, with a
decreasing risk of severe weather as the storms move
southeastward.

.SPOTTER AND EMERGENCY MANAGEMENT STATEMENT...
Storm spotter groups and emergency management personnel across
northwest Oklahoma should prepare for severe weather operations
tonight.

.DAYS TWO THROUGH SEVEN...Friday through Wednesday...

.Thunderstorms...
Thunderstorms are expected to continue off and on through next
Wednesday. On Friday, a Slight Risk of severe storms thunderstorms
covers southeast and south central Oklahoma and adjacent parts of
north Texas. Severe storms will be most likely in the afternoon
and evening. A Marginal Risk covers the area west of Enid to
Lawton to Seymour Texas on Saturday, mainly during the evening.
Severe thunderstorms will also be possible on Sunday, but details
are still uncertain regarding timing and location.

.Heavy rain...
Heavy rainfall is possible, particularly on Friday, and again
Sunday night into Monday. Heavy rainfall may lead to flooding.

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

Mahale

In the hours before

Local storm report, May 21, 8:04 PM CDT, 5 hours 47 minutes before

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Special weather statement, May 21, 8:33 PM CDT, 5 hours 18 minutes before

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Special weather statement, May 22, 1:19 AM CDT, 32 minutes before

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Special weather statement, May 22, 1:49 AM 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 22, 1:19 AM CDT	Special Weather Statement	OUN	Alfalfa, Harper, Woods, Woodward	26 min
May 22, 1:49 AM CDT	Special Weather Statement	OUN	Alfalfa, Woods, Woodward	41 min
May 22, 2:12 AM CDT	Severe Thunderstorm Warning	OUN	Major, Woods	18 min
May 22, 2:30 AM CDT	Special Weather Statement	OUN	Woods	30 min
May 22, 2:35 AM CDT	Special Weather Statement	OUN	Ellis, Grant, Major, Woodward	25 min
May 22, 2:44 AM CDT	Special Weather Statement	OUN	Woods	31 min
May 22, 3:02 AM CDT	Special Weather Statement	OUN	Blaine, Dewey, Ellis	28 min
May 22, 3:03 AM CDT	Special Weather Statement	OUN	Grant, Major	27 min
May 22, 3:06 AM CDT	Severe Thunderstorm Warning	OUN	Alfalfa, Garfield, Grant, Major	39 min
May 22, 3:19 AM CDT	Severe Thunderstorm Warning	OUN	Alfalfa, Garfield, Grant	41 min
May 22, 3:40 AM CDT	Severe Thunderstorm Warning	OUN	Garfield, Kingfisher, Logan, Major, Noble	50 min
May 22, 4:08 AM CDT	Special Weather Statement	OUN	Blaine	37 min
May 22, 4:20 AM CDT	Special Weather Statement	OUN	Blaine	25 min
May 22, 4:24 AM CDT	Severe Thunderstorm Warning	OUN	Canadian, Garfield, Grant, Kay, Kingfisher, Lincoln and 4 more	51 min
May 22, 4:40 AM CDT	Special Weather Statement	OUN	Stephens	35 min
May 22, 5:04 AM CDT	Special Weather Statement	OUN	Stephens	26 min
May 22, 5:07 AM CDT	Severe Thunderstorm Warning	OUN	Cleveland, Lincoln, Logan, Noble, Oklahoma, Payne and 2 more	38 min
May 22, 5:13 AM CDT	Severe Thunderstorm Warning	OUN	Carter, Jefferson, Stephens	47 min
May 22, 5:20 AM CDT	Special Weather Statement	OUN	McClain	25 min
May 22, 5:39 AM CDT	Severe Thunderstorm Warning	OUN	Cleveland, Lincoln, Oklahoma, Payne, Pottawatomie, Seminole	51 min
May 22, 5:53 AM CDT	Severe Thunderstorm Warning	OUN	Carter, Garvin, Grady, McClain, Murray, Stephens	52 min
May 22, 6:22 AM CDT	Severe Thunderstorm Warning	OUN	Cleveland, McClain, Pottawatomie	35 min
May 22, 6:24 AM CDT	Severe Thunderstorm Warning	OUN	Hughes, Lincoln, Pottawatomie, Seminole	51 min
May 22, 6:41 AM CDT	Severe Thunderstorm Warning	OUN	Garvin, McClain, Murray, Pontotoc, Pottawatomie, Seminole	49 min
May 22, 6:56 AM CDT	Special Weather Statement	OUN	Carter	34 min
May 22, 7:30 AM CDT	Special Weather Statement	OUN	Carter, Murray	30 min
May 22, 7:59 AM CDT	Special Weather Statement	OUN	Carter, Murray	31 min
May 22, 4:47 PM CDT	Special Weather Statement	OUN	Tillman	13 min
May 22, 4:57 PM CDT	Severe Thunderstorm Warning	OUN	Tillman	33 min
May 22, 5:28 PM CDT	Severe Thunderstorm Warning	OUN	Cotton, Tillman	47 min
May 22, 5:47 PM CDT	Severe Thunderstorm Warning	OUN	Comanche	28 min
May 22, 6:03 PM CDT	Severe Thunderstorm Warning	OUN	Cotton, Tillman	57 min
May 22, 6:12 PM CDT	Tornado Warning	OUN	Tillman	33 min
May 22, 6:18 PM CDT	Special Weather Statement	OUN	Comanche	27 min
May 22, 6:20 PM CDT	Severe Thunderstorm Warning	OUN	Comanche	25 min
May 22, 6:22 PM CDT	Severe Thunderstorm Warning	OUN	Cotton, Tillman	53 min
May 22, 6:39 PM CDT	Special Weather Statement	OUN	Caddo	36 min
May 22, 6:50 PM CDT	Severe Thunderstorm Warning	OUN	Cotton, Tillman	40 min
May 22, 6:57 PM CDT	Severe Thunderstorm Warning	OUN	Cotton	48 min
May 21, 8:01 PM CDT	Severe Thunderstorm Warning	OUN	Baylor, Knox	44 min
May 21, 8:33 PM CDT	Special Weather Statement	OUN	Baylor	12 min
May 21, 8:40 PM CDT	Severe Thunderstorm Warning	OUN	Baylor, Knox, Wilbarger	50 min
May 21, 9:26 PM CDT	Severe Thunderstorm Warning	OUN	Archer, Baylor, Wichita, Wilbarger	17 min
May 22, 6:41 PM CDT	Special Weather Statement	OUN	Clay	34 min
May 22, 6:53 PM CDT	Severe Thunderstorm Warning	OUN	Clay	52 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.