Alert archive / Oklahoma / Special Weather Statements in 2021

Special Weather Statement, NWS Norman, OK

May 20, 2021Major County, Oklahoma

NWS Norman, OK issued this special weather statement at May 20, 2021, 2:04 AM CDT for Major County, Oklahoma. It was in force for 26 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: May 20, 2021, 2:04 AM CDT (07:04 UTC)
Expired: May 20, 2021, 2:30 AM CDT
In force: 26 min
Issued by: NWS Norman, OK

County Major County, OK

The radar

The Vance AFB radar (KVNX), 69 km from the middle of the area, began a volume at 07:06 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

Dodge City, (KDDC), launched 00:00Z, 7.1 hours before the alert went out and 198 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: 528 J/kg
Mixed-layer CIN: -4 J/kg
Mixed-layer LCL: 1058 m above ground
0-6 km bulk shear: 22 kt
0-1 km storm-relative helicity: 61 m²/s²
0-3 km storm-relative helicity: 131 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.7

Open this sounding in Storm Lab

The text

As transmitted.

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What forecasters said that day

The local office's own words before this special weather statement 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 special weather statement went out at May 19, 11:27 PM CDT, 2 hours 37 minutes earlier.

Area forecast discussion, May 19, 11:27 PM CDT, 2 hours 37 minutes before

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Hazardous weather outlook, May 19, 9:14 PM CDT, 4 hours 50 minutes before

Hazardous Weather Outlook
National Weather Service Norman OK
914 PM CDT Wed May 19 2021

OKZ004>048-050>052-TXZ083>090-210215-
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-
914 PM CDT Wed May 19 2021

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

.DAY ONE...Overnight...

.Thunderstorms...
Showers and some storms will be scattered across portions of
Oklahoma and north Texas overnight. Isolated strong storms are
possible across western Oklahoma with hail to the size of
quarters the main threat. The potential for strong storms will
decrease overnight, although locally heavy rainfall will remain
possible through sunrise.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday...

.Thunderstorms...
Thunderstorm chances will continue into early next week. At this
time, the potential for severe weather is low.

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 19, 8:47 PM CDT, 5 hours 17 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE Norman OK
847 PM CDT Wed May 19 2021

TXZ083-200215-
Hardeman TX-
847 PM CDT Wed May 19 2021

...SIGNIFICANT WEATHER ADVISORY FOR northwestern Hardeman County
Until 915 PM CDT...

AT 844 PM CDT, a strong thunderstorm was located 5 miles west of
Goodlett, moving north at 25 MPH.

HAZARDS INCLUDE...
Hail up to the size of nickels...
Wind gusts to 50 MPH...

LAT...LON 3456 10000 3456 9997 3458 9995 3458 9993
      3455 9988 3432 9989 3432 10000
TIME...MOT...LOC 0144Z 175DEG 21KT 3435 9998

JT

Special weather statement, May 19, 9:00 PM CDT, 5 hours 4 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE Norman OK
900 PM CDT Wed May 19 2021

OKZ004-200230-
Harper OK-
900 PM CDT Wed May 19 2021

...SIGNIFICANT WEATHER ADVISORY FOR northwestern Harper County Until
930 PM CDT...

AT 857 PM CDT, a strong thunderstorm was located near Rosston, moving
north at 20 MPH.

HAZARDS INCLUDE...
Hail up to the size of nickels...
Wind gusts to 50 MPH...

LAT...LON 3700 9972 3669 9980 3677 9997 3690 10000
      3700 10000
TIME...MOT...LOC 0157Z 180DEG 17KT 3680 9988

JT

Special weather statement, May 19, 10:05 PM CDT, 3 hours 59 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE Norman OK
1005 PM CDT Wed May 19 2021

OKZ004-009-010-200330-
Woodward OK-Harper OK-Ellis OK-
1005 PM CDT Wed May 19 2021

...SIGNIFICANT WEATHER ADVISORY FOR northwestern Woodward...central
Harper and north central Ellis Counties Until 1030 PM CDT...

AT 1002 PM CDT, a strong thunderstorm was located 4 miles east of
May, moving north at 25 MPH.

HAZARDS INCLUDE...
Hail up to the size of nickels...
Wind gusts to 50 MPH...

LAT...LON 3700 9952 3656 9954 3653 9976 3700 9989
TIME...MOT...LOC 0302Z 171DEG 22KT 3663 9967

JT

Special weather statement, May 19, 10:14 PM CDT, 3 hours 50 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE Norman OK
1014 PM CDT Wed May 19 2021

OKZ033-TXZ083-200345-
Harmon OK-Hardeman TX-
1014 PM CDT Wed May 19 2021

...SIGNIFICANT WEATHER ADVISORY FOR southern Harmon and northwestern
Hardeman Counties Until 1045 PM CDT...

AT 1011 PM CDT, a strong thunderstorm was located 10 miles south of
Hollis, moving north at 25 MPH.

HAZARDS INCLUDE...
Hail up to the size of nickels...
Wind gusts to 50 MPH...

LAT...LON 3478 9997 3473 9968 3451 9978 3450 9984
      3449 9982 3448 9982 3446 9980 3445 9980
      3448 9995
TIME...MOT...LOC 0311Z 186DEG 24KT 3454 9989

JT

Special weather statement, May 19, 10:59 PM CDT, 3 hours 5 minutes before

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Special weather statement, May 20, 2:04 AM CDT, 0 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 19, 7:30 PM CDT	Special Weather Statement	OUN	Harmon	30 min
May 19, 7:45 PM CDT	Special Weather Statement	OUN	Beckham	30 min
May 19, 8:02 PM CDT	Special Weather Statement	OUN	Harmon	43 min
May 19, 8:24 PM CDT	Special Weather Statement	OUN	Roger Mills	51 min
May 19, 8:39 PM CDT	Special Weather Statement	OUN	Harmon	36 min
May 19, 9:00 PM CDT	Special Weather Statement	OUN	Harper	30 min
May 19, 10:05 PM CDT	Special Weather Statement	OUN	Harper	25 min
May 19, 10:14 PM CDT	Special Weather Statement	OUN	Harmon	31 min
May 19, 10:42 PM CDT	Areal Flood Advisory	OUN	Harper	3 hr
May 19, 10:59 PM CDT	Special Weather Statement	OUN	Woodward	31 min
May 19, 7:32 PM CDT	Special Weather Statement	OUN	Foard	28 min
May 19, 8:21 PM CDT	Special Weather Statement	OUN	Hardeman	39 min
May 19, 8:47 PM CDT	Special Weather Statement	OUN	Hardeman	28 min

Nearby

Special Weather Statements in Oklahoma, 2021 Every special weather statement in 2021

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.