Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 46, NWS Norman, OK

March 28, 20204 counties in Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at Mar 28, 2020, 3:42 AM CDT for 4 counties in Oklahoma. 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: Mar 28, 2020, 3:42 AM CDT (08:42 UTC)
Expired: Mar 28, 2020, 4:15 AM CDT
In force: 33 min
Issued by: NWS Norman, OK
Area: Storm-based polygon
Hail: 1.5 in
Wind: 60.0 mph

Counties Caddo County, OK, Comanche County, OK, Grady County, OK, Kiowa County, OK

The radar

The Altus AFB radar (KFDR), 82 km from the middle of the area, began a volume at 08:41 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 00:00Z, 8.7 hours before the alert went out and 99 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: 626 J/kg
Mixed-layer CIN: -208 J/kg
Mixed-layer LCL: 947 m above ground
0-6 km bulk shear: 83 kt
0-1 km storm-relative helicity: 48 m²/s²
0-3 km storm-relative helicity: 86 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.6

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 Mar 28, 3:11 AM CDT, 31 minutes earlier.

Area forecast discussion, Mar 28, 3:11 AM CDT, 31 minutes before

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Hazardous weather outlook, Mar 27, 8:10 PM CDT, 7 hours 32 minutes before

Hazardous Weather Outlook...UPDATED
National Weather Service Norman OK
810 PM CDT Fri Mar 27 2020

OKZ004>048-050>052-TXZ083>090-290115-
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-
810 PM CDT Fri Mar 27 2020

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

.DAY ONE...Through Tonight...

.Thunderstorms...
Scattered showers and thunderstorms are expected this evening
and overnight. A few severe storms are possible with hail up to
quarter size and winds of 60 mph being the main threats.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday...

.Thunderstorms...
Thunderstorms are expected Monday and early Tuesday.

.Fire Weather...
Elevated conditions are expected in the western quarter of Oklahoma
and adjacent parts of northern Texas. Strong and gusty west wind
will follow a front Saturday.

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 28, 3:34 AM CDT, 8 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE Norman OK
334 AM CDT Sat Mar 28 2020

OKZ023-035-037-038-280900-
Kiowa OK-Tillman OK-Caddo OK-Comanche OK-
334 AM CDT Sat Mar 28 2020

...SIGNIFICANT WEATHER ADVISORY FOR eastern Kiowa...northeastern
Tillman...southwestern Caddo and northwestern Comanche Counties Until
400 AM CDT...

AT 329 AM CDT, strong thunderstorms were along a line extending from
5 miles east of Cooperton to near Manitou, moving northeast at 55
MPH.

HAZARDS INCLUDE...
Hail up to one-half inch diameter...
Wind gusts to 40 MPH...

LAT...LON 3522 9826 3456 9850 3443 9906 3503 9877
TIME...MOT...LOC 0829Z 235DEG 46KT 3489 9878 3452 9899

WR

The office that day

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

Issued	Product	Office	Counties	Lasted
Mar 28, 3:34 AM CDT	Special Weather Statement	OUN	Caddo, Comanche	26 min
Mar 28, 3:51 AM CDT	Special Weather Statement	OUN	Stephens	24 min
Mar 28, 4:10 AM CDT	Special Weather Statement	OUN	Canadian	20 min
Mar 28, 4:15 AM CDT	Special Weather Statement	OUN	Logan, Noble	30 min
Mar 28, 4:17 AM CDT	Special Weather Statement	OUN	Garvin	28 min
Mar 28, 4:21 AM CDT	Severe Thunderstorm Warning	OUN	Canadian, Cleveland, Grady, Oklahoma	24 min
Mar 28, 4:24 AM CDT	Severe Thunderstorm Warning	OUN	Garvin, McClain	21 min
Mar 28, 4:26 AM CDT	Special Weather Statement	OUN	Cotton	34 min
Mar 28, 4:35 AM CDT	Severe Thunderstorm Warning	OUN	Comanche, Cotton, Grady, Stephens	25 min
Mar 28, 4:38 AM CDT	Severe Thunderstorm Warning	OUN	Cotton, Jefferson, Stephens	37 min
Mar 28, 4:45 AM CDT	Severe Thunderstorm Warning	OUN	Canadian, Cleveland, Grady, McClain, Oklahoma	30 min
Mar 28, 4:56 AM CDT	Special Weather Statement	OUN	Pottawatomie, Seminole	34 min
Mar 28, 5:05 AM CDT	Severe Thunderstorm Warning	OUN	Garvin, Grady, Stephens	30 min
Mar 28, 5:09 AM CDT	Special Weather Statement	OUN	Lincoln	36 min
Mar 28, 5:15 AM CDT	Severe Thunderstorm Warning	OUN	Lincoln, Oklahoma, Payne	45 min
Mar 28, 5:36 AM CDT	Special Weather Statement	OUN	Garvin	24 min
Mar 28, 6:01 AM CDT	Special Weather Statement	OUN	Seminole	29 min
Mar 28, 6:33 AM CDT	Special Weather Statement	OUN	Hughes	27 min
Mar 28, 6:44 AM CDT	Special Weather Statement	OUN	Bryan	31 min
Mar 28, 7:03 AM CDT	Wind Advisory	OUN	Alfalfa, Blaine, Custer, Dewey, Ellis, Garfield and 7 more	11 hr
Mar 28, 7:04 AM CDT	Special Weather Statement	OUN	Hughes	26 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.