Alert archive / Texas / Severe Thunderstorm Warnings in 2019

Severe Thunderstorm Warning 276, NWS Norman, OK

May 18, 20194 counties in Texas

NWS Norman, OK issued this severe thunderstorm warning at May 18, 2019, 5:57 AM CDT for 4 counties in Texas. It was in force for 33 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, 2019, 5:57 AM CDT (10:57 UTC)
Expired: May 18, 2019, 6:30 AM CDT
In force: 33 min
Issued by: NWS Norman, OK
Area: Storm-based polygon
Hail: 1.5 in
Wind: 60.0 mph

Counties Baylor County, TX, Foard County, TX, Knox County, TX, Wilbarger County, TX

The radar

The Altus AFB radar (KFDR), 77 km from the middle of the area, began a volume at 10:59 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 18, 2:20 AM CDT	Tornado Watch	SPC	8 hr

The nearest sounding before it

Fort Worth, TX (KFWD), launched 00:00Z, 11.0 hours before the alert went out and 232 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: 1123 J/kg
Mixed-layer CIN: -131 J/kg
Mixed-layer LCL: 1440 m above ground
0-6 km bulk shear: 25 kt
0-1 km storm-relative helicity: 86 m²/s²
0-3 km storm-relative helicity: 204 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 3.6

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, 2:55 AM CDT, 3 hours 2 minutes earlier.

Area forecast discussion, May 18, 2:55 AM CDT, 3 hours 2 minutes before

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Hazardous weather outlook, May 18, 4:32 AM CDT, 1 hour 25 minutes before

Hazardous Weather Outlook
National Weather Service Norman OK
432 AM CDT Sat May 18 2019

OKZ004>048-050>052-TXZ083>090-182000-
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-
432 AM CDT Sat May 18 2019

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

.DAY ONE...Today and Tonight...

.Thunderstorms and flooding...
A large area of strong to severe storms is expected to affect
central and southern Oklahoma, and north Texas, this morning and
early afternoon. Additional storms may develop in western
Oklahoma this afternoon, then move northeast this evening. Any of
the storms may produce hail up to baseball size, damaging winds,
and flooding rain. A few tornadoes may occur, with the highest
risk in southeast Oklahoma this afternoon.

.SPOTTER AND EMERGENCY MANAGEMENT STATEMENT...

Storm spotter groups and emergency management personnel across
Oklahoma and north Texas should prepare for severe weather
operations through this evening.

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

.Thunderstorms and flooding...
Thunderstorms are in the forecast Sunday night through Friday. The
most significant and widespread severe weather is expected Monday
into Monday night across most of Oklahoma and north Texas. Very
large hail, damaging winds, and tornadoes will be possible with
the strongest storms on Monday. The risk of severe storms will
diminish through the end of the week.

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

In the hours before

Special weather statement, May 18, 4:55 AM CDT, 1 hour 2 minutes before

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Special weather statement, May 18, 5:19 AM CDT, 38 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, 6:27 AM CDT	Special Weather Statement	OUN	Cotton	33 min
May 18, 6:32 AM CDT	Special Weather Statement	OUN	Grady	28 min
May 18, 6:36 AM CDT	Special Weather Statement	OUN	Comanche	24 min
May 18, 6:42 AM CDT	Severe Thunderstorm Warning	OUN	Caddo, Comanche, Grady	48 min
May 18, 6:45 AM CDT	Severe Thunderstorm Warning	OUN	Comanche, Cotton	30 min
May 18, 6:52 AM CDT	Severe Thunderstorm Warning	OUN	Canadian, Cleveland, Grady, McClain, Oklahoma	38 min
May 18, 7:17 AM CDT	Special Weather Statement	OUN	Canadian	28 min
May 18, 7:18 AM CDT	Special Weather Statement	OUN	Oklahoma	27 min
May 18, 7:21 AM CDT	Areal Flood Advisory	OUN	Comanche, Tillman	114 min
May 18, 7:26 AM CDT	Areal Flood Advisory	OUN	Canadian, Cleveland, Grady, McClain, Oklahoma	2 hr
May 18, 7:30 AM CDT	Severe Thunderstorm Warning	OUN	Cleveland, Logan, Oklahoma	45 min
May 18, 7:32 AM CDT	Severe Thunderstorm Warning	OUN	Caddo, Comanche, Kiowa	43 min
May 18, 7:33 AM CDT	Special Weather Statement	OUN	Grady	27 min
May 18, 7:35 AM CDT	Special Weather Statement	OUN	Canadian	25 min
May 18, 7:37 AM CDT	Tornado Warning	OUN	Comanche	24 min
May 18, 7:56 AM CDT	Flash Flood Warning	OUN	Caddo, Comanche, Grady, Stephens	3 hr
May 18, 7:58 AM CDT	Severe Thunderstorm Warning	OUN	Caddo, Canadian, Grady, Kiowa, Washita	47 min
May 18, 7:59 AM CDT	Severe Thunderstorm Warning	OUN	Canadian, Grady	46 min
May 18, 8:03 AM CDT	Special Weather Statement	OUN	Logan	27 min
May 18, 8:04 AM CDT	Flash Flood Warning	OUN	Canadian, Cleveland, Grady, McClain, Oklahoma	3 hr
May 18, 8:11 AM CDT	Special Weather Statement	OUN	Oklahoma	34 min
May 18, 8:21 AM CDT	Special Weather Statement	OUN	Canadian	24 min
May 18, 8:23 AM CDT	Severe Thunderstorm Warning	OUN	Canadian, Kingfisher	52 min
May 18, 8:44 AM CDT	Special Weather Statement	OUN	Cleveland, Logan, Oklahoma	31 min
May 18, 8:53 AM CDT	Severe Thunderstorm Warning	OUN	Cleveland, Lincoln, Oklahoma, Pottawatomie	52 min
May 18, 8:57 AM CDT	Special Weather Statement	OUN	Garvin, Jefferson	33 min
May 18, 9:05 AM CDT	Severe Thunderstorm Warning	OUN	Carter, Garvin, Jefferson, McClain, Murray, Stephens	40 min
May 18, 9:09 AM CDT	Areal Flood Advisory	OUN	Cleveland, Lincoln, Logan, Oklahoma, Payne, Pottawatomie	3 hr
May 18, 9:32 AM CDT	Severe Thunderstorm Warning	OUN	Garvin, McClain, Pontotoc, Pottawatomie, Seminole	43 min
May 18, 9:46 AM CDT	Severe Thunderstorm Warning	OUN	Carter, Garvin, Johnston, Murray, Pontotoc	44 min
May 18, 10:07 AM CDT	Severe Thunderstorm Warning	OUN	Hughes, Seminole	38 min
May 18, 10:11 AM CDT	Severe Thunderstorm Warning	OUN	Atoka, Coal, Hughes, Johnston, Pontotoc, Seminole	64 min
May 18, 10:14 AM CDT	Areal Flood Advisory	OUN	Grant, Kay	3 hr
May 18, 10:26 AM CDT	Areal Flood Advisory	OUN	Garvin, Johnston, Murray, Pontotoc	3 hr
May 18, 10:36 AM CDT	Severe Thunderstorm Warning	OUN	Hughes, Seminole	24 min
May 18, 10:50 AM CDT	Severe Thunderstorm Warning	OUN	Atoka, Bryan, Coal, Johnston, Marshall	55 min
May 18, 10:53 AM CDT	Special Weather Statement	OUN	Hughes	37 min
May 18, 10:54 AM CDT	Areal Flood Warning	OUN	Canadian, Cleveland, Grady, Oklahoma	3 hr
May 18, 11:13 AM CDT	Severe Thunderstorm Warning	OUN	Atoka, Coal, Hughes	32 min
May 18, 11:51 AM CDT	Special Weather Statement	OUN	Atoka, Bryan, Coal	39 min
May 18, 12:25 PM CDT	Special Weather Statement	OUN	Atoka, Bryan	35 min
May 18, 5:05 PM CDT	Special Weather Statement	OUN	Bryan	40 min
May 18, 5:10 PM CDT	Severe Thunderstorm Warning	OUN	Woods	50 min
May 18, 5:14 PM CDT	Special Weather Statement	OUN	Blaine	31 min
May 18, 5:35 PM CDT	Special Weather Statement	OUN	Woodward	25 min
May 18, 5:41 PM CDT	Severe Thunderstorm Warning	OUN	Blaine, Dewey, Major	49 min
May 18, 5:57 PM CDT	Severe Thunderstorm Warning	OUN	Alfalfa, Woods	48 min
May 18, 5:59 PM CDT	Severe Thunderstorm Warning	OUN	Major, Woods, Woodward	46 min
May 18, 6:13 PM CDT	Severe Thunderstorm Warning	OUN	Alfalfa, Woods	47 min
May 18, 6:28 PM CDT	Severe Thunderstorm Warning	OUN	Blaine, Garfield, Kingfisher, Major	52 min
May 18, 6:33 PM CDT	Special Weather Statement	OUN	Harper	27 min
May 18, 6:44 PM CDT	Severe Thunderstorm Warning	OUN	Alfalfa, Woods	61 min
May 18, 6:53 PM CDT	Severe Thunderstorm Warning	OUN	Alfalfa, Major, Woods	67 min
May 18, 4:55 AM CDT	Special Weather Statement	OUN	Baylor	20 min
May 18, 5:16 AM CDT	Severe Thunderstorm Warning	OUN	Baylor, Foard, Wilbarger	44 min
May 18, 5:19 AM CDT	Special Weather Statement	OUN	Knox	26 min
May 18, 6:38 AM CDT	Special Weather Statement	OUN	Wilbarger	37 min
May 18, 7:16 AM CDT	Areal Flood Advisory	OUN	Baylor, Foard, Knox, Wichita, Wilbarger	119 min

Nearby

Severe Thunderstorm Warnings in Texas, 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.