Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 35, NWS Norman, OK

March 19, 2020Cotton County, Tillman County, Oklahoma; Archer County, Wichita County, Texas

NWS Norman, OK issued this severe thunderstorm warning at Mar 19, 2020, 5:30 AM CDT for Cotton County, Tillman County, Oklahoma; Archer County, Wichita County, Texas. It was in force for 45 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: Mar 19, 2020, 5:30 AM CDT (10:30 UTC)
Expired: Mar 19, 2020, 6:15 AM CDT
In force: 45 min
Issued by: NWS Norman, OK
Area: Storm-based polygon
Hail: 1.5 in
Wind: 60.0 mph

Counties Cotton County, OK, Tillman County, OK, Archer County, TX, Wichita County, TX

The radar

The Altus AFB radar (KFDR), 43 km from the middle of the area, began a volume at 10:34 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, 10.5 hours before the alert went out and 173 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: 1121 J/kg
Mixed-layer CIN: -20 J/kg
Mixed-layer LCL: 1110 m above ground
0-6 km bulk shear: 31 kt
0-1 km storm-relative helicity: 86 m²/s²
0-3 km storm-relative helicity: 127 m²/s²
Significant tornado parameter: 0.3
Supercell composite: 3.4

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 Mar 19, 3:41 AM CDT, 1 hour 49 minutes earlier.

Area forecast discussion, Mar 19, 3:41 AM CDT, 1 hour 49 minutes before

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Hazardous weather outlook, Mar 19, 4:15 AM CDT, 1 hour 15 minutes before

Hazardous Weather Outlook
National Weather Service Norman OK
415 AM CDT Thu Mar 19 2020

OKZ004>048-050>052-TXZ083>090-200915-
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-
415 AM CDT Thu Mar 19 2020

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

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

.Thunderstorms...
There is a Slight Risk of severe storms today in eastern Oklahoma,
east of Holdenville to Madill. A Marginal Risk area extends west
to Ponca City, Oklahoma City, Duncan, and Henrietta Texas. Strong
to severe storms are expected this morning, and possibly into the
afternoon, in these areas. With relatively weak instability and
substantial vertical wind shear, the primary threat will be strong
winds within linear convective systems.

.Winds...
Southwest winds at 25 to 35 mph with gusts around 50 mph are
likely across northwest Oklahoma today. Winds of 20 to 30 mph and
gusts around 40 are expected from southwest to north-central
Oklahoma today.

.Flooding...
Heavy rainfall is possible today over areas that have already
received substantial rain amounts. The greatest threat for
flooding will be across parts of central and southeast Oklahoma.

.SPOTTER AND EMERGENCY MANAGEMENT STATEMENT...

Storm spotter groups and emergency management personnel across
central and southeast Oklahoma should prepare for severe weather
operations this morning, possibly into the afternoon.

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

.Thunderstorms...
There is a chance of thunderstorms Saturday evening and Monday
evening. Severe weather is not expected either day.

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, Mar 19, 3:50 AM CDT, 1 hour 40 minutes before

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Special weather statement, Mar 19, 4:19 AM CDT, 1 hour 11 minutes before

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Special weather statement, Mar 19, 4:21 AM CDT, 1 hour 9 minutes before

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Special weather statement, Mar 19, 4:38 AM CDT, 52 minutes before

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Special weather statement, Mar 19, 4:44 AM CDT, 46 minutes before

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Special weather statement, Mar 19, 5:08 AM CDT, 22 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE Norman OK
508 AM CDT Thu Mar 19 2020

OKZ050-051-191045-
Love OK-Marshall OK-
508 AM CDT Thu Mar 19 2020

...SIGNIFICANT WEATHER ADVISORY FOR south central Love and southern
Marshall Counties Until 545 AM CDT...

AT 505 AM CDT, a strong thunderstorm was located 4 miles south of
Thackerville, moving northeast at 60 MPH.

HAZARDS INCLUDE...
Hail up to one-half inch diameter...
Wind gusts to 50 MPH...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Monitor the weather situation closely and be alert for threatening
weather conditions.

&&

LAT...LON 3374 9717 3379 9710 3379 9707 3387 9689
      3392 9690 3406 9669 3390 9661 3392 9667
      3384 9670 3382 9675 3383 9677 3387 9680
      3387 9683 3385 9685 3386 9690 3377 9709
      3374 9709 3372 9711 3372 9714
TIME...MOT...LOC 1005Z 233DEG 51KT 3374 9712

BRB

The office that day

Everything else NWS Norman, OK issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Mar 18, 7:03 PM CDT	Severe Thunderstorm Warning	OUN	Jackson, Kiowa	42 min
Mar 18, 7:19 PM CDT	River Flood Warning	OUN	Cotton	69 hr
Mar 18, 7:33 PM CDT	Severe Thunderstorm Warning	OUN	Kiowa	29 min
Mar 18, 7:38 PM CDT	Special Weather Statement	OUN	Jackson	37 min
Mar 18, 7:45 PM CDT	Areal Flood Advisory	OUN	Harmon, Jackson	2 hr
Mar 18, 8:01 PM CDT	Special Weather Statement	OUN	Tillman	29 min
Mar 18, 8:12 PM CDT	Special Weather Statement	OUN	Oklahoma	33 min
Mar 18, 8:20 PM CDT	Severe Thunderstorm Warning	OUN	Jackson, Kiowa	40 min
Mar 18, 8:39 PM CDT	Flash Flood Warning	OUN	Jackson, Kiowa	2 hr
Mar 18, 8:40 PM CDT	Special Weather Statement	OUN	Oklahoma	35 min
Mar 18, 8:46 PM CDT	Severe Thunderstorm Warning	OUN	Comanche, Kiowa	44 min
Mar 18, 9:48 PM CDT	Areal Flood Advisory	OUN	Caddo, Kiowa, Washita	117 min
Mar 18, 10:47 PM CDT	Severe Thunderstorm Warning	OUN	Love	43 min
Mar 18, 11:06 PM CDT	Tornado Warning	OUN	Love	24 min
Mar 18, 11:16 PM CDT	Areal Flood Advisory	OUN	Canadian, Grady, Oklahoma	3 hr
Mar 18, 11:29 PM CDT	Tornado Warning	OUN	Love, Marshall	46 min
Mar 18, 11:44 PM CDT	Areal Flood Advisory	OUN	Caddo, Kiowa, Washita	2 hr
Mar 19, 12:02 AM CDT	Areal Flood Advisory	OUN	Oklahoma	3 hr
Mar 19, 12:32 AM CDT	Flash Flood Warning	OUN	Canadian, Oklahoma	5 hr
Mar 19, 1:04 AM CDT	Special Weather Statement	OUN	Lincoln	26 min
Mar 19, 1:45 AM CDT	Areal Flood Advisory	OUN	Lincoln, Payne	3 hr
Mar 19, 2:08 AM CDT	Areal Flood Advisory	OUN	Atoka, Coal, Johnston	3 hr
Mar 19, 2:30 AM CDT	Special Weather Statement	OUN	Comanche, Tillman	30 min
Mar 19, 2:37 AM CDT	Severe Thunderstorm Warning	OUN	Comanche, Cotton, Tillman	53 min
Mar 19, 2:46 AM CDT	Areal Flood Advisory	OUN	Caddo, Comanche, Kiowa	3 hr
Mar 19, 2:53 AM CDT	Special Weather Statement	OUN	Cleveland, Pottawatomie	37 min
Mar 19, 3:09 AM CDT	Severe Thunderstorm Warning	OUN	Caddo, Comanche, Grady, Stephens	51 min
Mar 19, 3:31 AM CDT	Special Weather Statement	OUN	Jefferson	29 min
Mar 19, 3:42 AM CDT	Severe Thunderstorm Warning	OUN	Canadian, Cleveland, Grady, McClain, Oklahoma	48 min
Mar 19, 3:50 AM CDT	Special Weather Statement	OUN	Garvin, Stephens	25 min
Mar 19, 4:19 AM CDT	Special Weather Statement	OUN	Garvin, Murray, Pontotoc, Pottawatomie	26 min
Mar 19, 4:21 AM CDT	Special Weather Statement	OUN	Lincoln	24 min
Mar 19, 4:33 AM CDT	River Flood Warning	OUN	Jackson, Kiowa, Tillman	3 hr
Mar 19, 4:44 AM CDT	Special Weather Statement	OUN	Pontotoc	31 min
Mar 19, 5:08 AM CDT	Special Weather Statement	OUN	Marshall	37 min
Mar 19, 5:30 AM CDT	Areal Flood Advisory	OUN	Atoka, Bryan, Coal, Johnston, Marshall	3 hr
Mar 19, 6:06 AM CDT	Special Weather Statement	OUN	Cotton	24 min
Mar 19, 6:21 AM CDT	Special Weather Statement	OUN	Garvin	24 min
Mar 19, 6:37 AM CDT	Areal Flood Advisory	OUN	Cotton, Garvin, Stephens	3 hr
Mar 19, 7:32 AM CDT	Special Weather Statement	OUN	Tillman	28 min
Mar 19, 7:40 AM CDT	River Flood Warning	OUN	Pottawatomie, Seminole	19 hr
Mar 19, 7:41 AM CDT	Areal Flood Advisory	OUN	Garvin, McClain, Pontotoc, Pottawatomie, Seminole	3 hr
Mar 19, 8:16 AM CDT	Special Weather Statement	OUN	Cotton	29 min
Mar 19, 8:21 AM CDT	Flash Flood Warning	OUN	Comanche, Cotton	3 hr
Mar 19, 8:29 AM CDT	Flash Flood Warning	OUN	Stephens	3 hr
Mar 19, 8:37 AM CDT	Special Weather Statement	OUN	McClain	23 min
Mar 19, 8:43 AM CDT	River Flood Warning	OUN	Lincoln, Oklahoma, Pottawatomie	12 hr
Mar 19, 8:48 AM CDT	Areal Flood Advisory	OUN	Cleveland, Garvin, Grady, McClain	3 hr
Mar 19, 8:58 AM CDT	Special Weather Statement	OUN	Cleveland, McClain, Pottawatomie	32 min
Mar 19, 9:03 AM CDT	Severe Thunderstorm Warning	OUN	Cleveland, McClain, Pottawatomie, Seminole	42 min
Mar 19, 9:12 AM CDT	Flash Flood Warning	OUN	Cleveland, Garvin, McClain	2 hr
Mar 19, 9:19 AM CDT	River Flood Warning	OUN	Comanche, Cotton	41 hr
Mar 19, 9:28 AM CDT	Areal Flood Advisory	OUN	Pottawatomie	3 hr
Mar 19, 9:45 AM CDT	Severe Thunderstorm Warning	OUN	Pottawatomie, Seminole	33 min
Mar 19, 10:56 AM CDT	Areal Flood Warning	OUN	Comanche, Cotton	6 hr
Mar 19, 11:24 AM CDT	Areal Flood Warning	OUN	Cleveland, Garvin, McClain	6 hr
Mar 19, 11:33 AM CDT	Areal Flood Warning	OUN	Stephens	5 hr
Mar 19, 1:08 PM CDT	Special Weather Statement	OUN	Murray	37 min
Mar 19, 2:09 PM CDT	Special Weather Statement	OUN	Hughes	36 min
Mar 19, 2:14 PM CDT	River Flood Warning	OUN	Carter, Garvin, Murray	6 hr
Mar 19, 2:15 PM CDT	Severe Thunderstorm Warning	OUN	Coal, Hughes	30 min
Mar 19, 2:27 PM CDT	Special Weather Statement	OUN	Murray	33 min
Mar 19, 4:08 PM CDT	Special Weather Statement	OUN	Atoka	37 min
Mar 19, 5:13 PM CDT	Special Weather Statement	OUN	Bryan	32 min
Mar 18, 7:15 PM CDT	Special Weather Statement	OUN	Baylor	30 min
Mar 18, 7:30 PM CDT	Severe Thunderstorm Warning	OUN	Baylor, Wilbarger	45 min
Mar 18, 8:03 PM CDT	Severe Thunderstorm Warning	OUN	Foard	42 min
Mar 18, 8:05 PM CDT	Special Weather Statement	OUN	Wilbarger	25 min
Mar 18, 9:08 PM CDT	Special Weather Statement	OUN	Archer	37 min
Mar 19, 1:24 AM CDT	Special Weather Statement	OUN	Wilbarger	36 min
Mar 19, 4:38 AM CDT	Special Weather Statement	OUN	Baylor	37 min
Mar 19, 5:12 AM CDT	Severe Thunderstorm Warning	OUN	Baylor, Wilbarger	33 min
Mar 19, 7:07 AM CDT	Special Weather Statement	OUN	Wilbarger	23 min
Mar 19, 10:24 AM CDT	Special Weather Statement	OUN	Wichita	36 min
Mar 19, 10:59 AM CDT	Special Weather Statement	OUN	Clay	31 min

Nearby

Severe Thunderstorm Warnings in Oklahoma, 2020 Severe Thunderstorm Warnings in Texas, 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.