Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2019

Severe Thunderstorm Warning 119, NWS Norman, OK

April 30, 2019Alfalfa County, Major County, Woods County, Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at Apr 30, 2019, 1:37 PM CDT for Alfalfa County, Major County, Woods County, Oklahoma. It was in force for 38 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: Apr 30, 2019, 1:37 PM CDT (18:37 UTC)
Expired: Apr 30, 2019, 2:15 PM CDT
In force: 38 min
Issued by: NWS Norman, OK
Area: Storm-based polygon
Hail: 1.5 in
Wind: 60.0 mph

Counties Alfalfa County, OK, Major County, OK, Woods County, OK

The radar

The Vance AFB radar (KVNX), 43 km from the middle of the area, began a volume at 18:41 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 12:00Z, 6.6 hours before the alert went out and 187 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: 1242 J/kg
Mixed-layer CIN: -1 J/kg
Mixed-layer LCL: 541 m above ground
0-6 km bulk shear: 38 kt
0-1 km storm-relative helicity: 153 m²/s²
0-3 km storm-relative helicity: 146 m²/s²
Significant tornado parameter: 0.6
Supercell composite: 4.7

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 Apr 30, 12:30 PM CDT, 1 hour 7 minutes earlier.

Area forecast discussion, Apr 30, 12:30 PM CDT, 1 hour 7 minutes before

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Hazardous weather outlook, Apr 30, 12:27 PM CDT, 1 hour 10 minutes before

Hazardous Weather Outlook...UPDATED
National Weather Service Norman OK
1227 PM CDT Tue Apr 30 2019

OKZ004>048-050>052-TXZ083>090-011730-
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-
1227 PM CDT Tue Apr 30 2019

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

.DAY ONE...Through Tonight...

.Thunderstorms...
There is an enhanced risk of severe thunderstorms today across
the eastern half of Oklahoma. A slight risk covers the western
half of Oklahoma and western north Texas.

Location...
The enhanced risk area is generally along and east of a Stillwater
to Oklahoma City and Duncan line. The slight risk area is
generally west of the enhanced risk to the Oklahoma and Texas
state line.

Timing...
The most likely time for severe storms will be from now through
Midnight.

Impacts...
Hail up to the size of golf balls.
Damaging winds of 60 to 70 mph.
A few tornadoes possible.
Excessive rainfall with flooding possible.

Discussion...
Scattered to numerous storms are expected to continue through the
afternoon moving east through the evening. Large hail and damaging
wind gusts will be the main threats. For storms that form along or
south of the cold front, there is also a risk for a tornado or two
developing.

.SPOTTER AND EMERGENCY MANAGEMENT STATEMENT...
Storm spotter groups and emergency management personnel across
the area should prepare for potential severe weather operations.

.DAYS TWO THROUGH SEVEN...Wednesday through Monday...
There is a slight risk of severe thunderstorms on Wednesday mainly
across the eastern half of Oklahoma. A marginal risk covers the
western half of Oklahoma and western north Texas. The most likely
time for severe weather will be during the afternoon and evening.

Thunderstorms remain in the forecast for Thursday through Monday.

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, Apr 30, 12:24 PM CDT, 1 hour 13 minutes before

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Special weather statement, Apr 30, 12:42 PM CDT, 55 minutes before

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Local storm report, Apr 30, 12:49 PM CDT, 48 minutes before

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Special weather statement, Apr 30, 12:53 PM CDT, 44 minutes before

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Special weather statement, Apr 30, 1:19 PM CDT, 18 minutes before

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Special weather statement, Apr 30, 1:26 PM 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
Apr 30, 12:12 AM CDT	Special Weather Statement	OUN	Blaine	33 min
Apr 30, 3:32 AM CDT	Special Weather Statement	OUN	Garfield	28 min
Apr 30, 5:07 AM CDT	Areal Flood Advisory	OUN	Garfield	113 min
Apr 30, 9:13 AM CDT	Special Weather Statement	OUN	Ellis, Harper	32 min
Apr 30, 9:35 AM CDT	Special Weather Statement	OUN	Oklahoma	25 min
Apr 30, 10:02 AM CDT	Areal Flood Advisory	OUN	Logan, Oklahoma	3 hr
Apr 30, 10:02 AM CDT	Special Weather Statement	OUN	Cleveland	13 min
Apr 30, 10:04 AM CDT	Special Weather Statement	OUN	Grady	26 min
Apr 30, 10:07 AM CDT	Special Weather Statement	OUN	Oklahoma	23 min
Apr 30, 10:12 AM CDT	Special Weather Statement	OUN	Cleveland	33 min
Apr 30, 10:27 AM CDT	Special Weather Statement	OUN	Lincoln	33 min
Apr 30, 10:32 AM CDT	Special Weather Statement	OUN	Cleveland	28 min
Apr 30, 10:35 AM CDT	Special Weather Statement	OUN	Oklahoma, Payne	25 min
Apr 30, 10:54 AM CDT	Severe Thunderstorm Warning	OUN	Lincoln, Logan, Oklahoma	51 min
Apr 30, 10:56 AM CDT	Severe Thunderstorm Warning	OUN	Beckham, Roger Mills	49 min
Apr 30, 10:58 AM CDT	River Flood Warning	OUN	Grant, Kay, Noble	67 hr
Apr 30, 10:58 AM CDT	Severe Thunderstorm Warning	OUN	Noble, Payne	47 min
Apr 30, 10:59 AM CDT	River Flood Warning	OUN	Kingfisher, Logan	48 hr
Apr 30, 11:00 AM CDT	River Flood Warning	OUN	Pottawatomie, Seminole	27 hr
Apr 30, 11:16 AM CDT	Tornado Warning	OUN	Lincoln, Payne	44 min
Apr 30, 11:30 AM CDT	Special Weather Statement	OUN	Murray	30 min
Apr 30, 11:44 AM CDT	Severe Thunderstorm Warning	OUN	Payne	31 min
Apr 30, 11:49 AM CDT	Severe Thunderstorm Warning	OUN	Carter, Johnston, Murray, Pontotoc	41 min
Apr 30, 11:50 AM CDT	Tornado Warning	OUN	Lincoln, Payne	40 min
Apr 30, 11:58 AM CDT	Severe Thunderstorm Warning	OUN	Dewey, Ellis, Roger Mills, Woodward	47 min
Apr 30, 12:08 PM CDT	Tornado Warning	OUN	Johnston, Murray, Pontotoc	37 min
Apr 30, 12:30 PM CDT	Severe Thunderstorm Warning	OUN	Payne	15 min
Apr 30, 12:35 PM CDT	Tornado Warning	OUN	Pontotoc	25 min
Apr 30, 12:42 PM CDT	Special Weather Statement	OUN	Dewey	33 min
Apr 30, 12:53 PM CDT	Special Weather Statement	OUN	Lincoln	22 min
Apr 30, 1:19 PM CDT	Special Weather Statement	OUN	Payne	26 min
Apr 30, 1:26 PM CDT	Special Weather Statement	OUN	Major	34 min
Apr 30, 2:11 PM CDT	Special Weather Statement	OUN	Alfalfa, Woods	49 min
Apr 30, 2:23 PM CDT	River Flood Warning	OUN	Atoka	5 days
Apr 30, 2:33 PM CDT	Special Weather Statement	OUN	Garfield	27 min
Apr 30, 3:00 PM CDT	Severe Thunderstorm Warning	OUN	Tillman	45 min
Apr 30, 3:06 PM CDT	Special Weather Statement	OUN	Canadian, Grady, McClain	24 min
Apr 30, 3:10 PM CDT	Severe Thunderstorm Warning	OUN	Tillman	50 min
Apr 30, 3:33 PM CDT	Severe Thunderstorm Warning	OUN	Canadian, Grady, Oklahoma	42 min
Apr 30, 3:35 PM CDT	Tornado Warning	OUN	Cotton, Tillman	40 min
Apr 30, 3:43 PM CDT	Special Weather Statement	OUN	Kay	32 min
Apr 30, 3:47 PM CDT	Areal Flood Advisory	OUN	Canadian, Cleveland, Grady, McClain, Oklahoma	3 hr
Apr 30, 3:57 PM CDT	Special Weather Statement	OUN	Cotton	33 min
Apr 30, 4:00 PM CDT	Severe Thunderstorm Warning	OUN	Comanche, Cotton, Tillman	45 min
Apr 30, 4:03 PM CDT	Severe Thunderstorm Warning	OUN	Cotton	42 min
Apr 30, 4:06 PM CDT	Special Weather Statement	OUN	McClain	24 min
Apr 30, 4:06 PM CDT	Severe Thunderstorm Warning	OUN	Comanche, Cotton, Grady, Stephens	39 min
Apr 30, 4:08 PM CDT	Severe Thunderstorm Warning	OUN	Canadian, Logan, Oklahoma	52 min
Apr 30, 4:12 PM CDT	Severe Thunderstorm Warning	OUN	Cleveland, Garvin, McClain	48 min
Apr 30, 4:24 PM CDT	Flash Flood Warning	OUN	Canadian, Cleveland, Oklahoma	3 hr
Apr 30, 4:31 PM CDT	Tornado Warning	OUN	Cotton	29 min
Apr 30, 4:32 PM CDT	Areal Flood Advisory	OUN	Lincoln, Logan, Noble, Oklahoma, Payne	3 hr
Apr 30, 4:48 PM CDT	Severe Thunderstorm Warning	OUN	Comanche, Cotton, Stephens	42 min
Apr 30, 4:49 PM CDT	Severe Thunderstorm Warning	OUN	Cleveland, Lincoln, Logan, Oklahoma, Payne	41 min
Apr 30, 4:51 PM CDT	Special Weather Statement	OUN	Grady	24 min
Apr 30, 4:56 PM CDT	Tornado Warning	OUN	Cotton, Jefferson, Stephens	24 min
Apr 30, 5:05 PM CDT	Areal Flood Advisory	OUN	Caddo, Comanche, Cotton, Grady, Jefferson, McClain and 2 more	115 min
Apr 30, 5:16 PM CDT	Severe Thunderstorm Warning	OUN	Cotton, Tillman	44 min
Apr 30, 5:22 PM CDT	Areal Flood Advisory	OUN	Cleveland, Garvin, Grady, McClain, Oklahoma, Pottawatomie and 1 more	3 hr
Apr 30, 5:23 PM CDT	Severe Thunderstorm Warning	OUN	Cleveland, Lincoln, Pottawatomie	52 min
Apr 30, 5:26 PM CDT	Flash Flood Warning	OUN	Comanche, Cotton, Stephens	2 hr
Apr 30, 5:33 PM CDT	Areal Flood Advisory	OUN	Cotton, Tillman	117 min
Apr 30, 5:50 PM CDT	Severe Thunderstorm Warning	OUN	Love	30 min
Apr 30, 5:57 PM CDT	Severe Thunderstorm Warning	OUN	Cotton, Tillman	48 min
Apr 30, 6:01 PM CDT	Flash Flood Warning	OUN	Lincoln, Logan, Oklahoma, Payne	119 min
Apr 30, 6:18 PM CDT	Special Weather Statement	OUN	Lincoln	27 min
Apr 30, 6:25 PM CDT	Special Weather Statement	OUN	Marshall	20 min
Apr 30, 6:46 PM CDT	Special Weather Statement	OUN	Cotton	29 min
Apr 30, 6:50 PM CDT	Areal Flood Advisory	OUN	Cleveland, Lincoln, Pottawatomie, Seminole	3 hr
Apr 30, 6:54 PM CDT	Severe Thunderstorm Warning	OUN	Cleveland, McClain, Pottawatomie	51 min
Apr 30, 6:55 PM CDT	Severe Thunderstorm Warning	OUN	Cotton	50 min
Apr 30, 3:38 PM CDT	Special Weather Statement	OUN	Wichita	37 min
Apr 30, 4:41 PM CDT	Special Weather Statement	OUN	Clay	34 min
Apr 30, 5:10 PM CDT	Special Weather Statement	OUN	Wilbarger	35 min
Apr 30, 5:45 PM CDT	Special Weather Statement	OUN	Knox	30 min
Apr 30, 6:16 PM CDT	Special Weather Statement	OUN	Knox	29 min
Apr 30, 6:44 PM CDT	Special Weather Statement	OUN	Knox	31 min

Nearby

Severe Thunderstorm Warnings in Oklahoma, 2019 Every severe thunderstorm warning in 2019

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.