Alert archive / Oklahoma / Special Weather Statements in 2021

Special Weather Statement, NWS Norman, OK

May 18, 2021Roger Mills County, Oklahoma

NWS Norman, OK issued this special weather statement at May 18, 2021, 12:21 AM CDT for Roger Mills County, Oklahoma. It was in force for 24 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 18, 2021, 12:21 AM CDT (05:21 UTC)
Expired: May 18, 2021, 12:45 AM CDT
In force: 24 min
Issued by: NWS Norman, OK

County Roger Mills County, OK

The radar

The Vance AFB radar (KVNX), 156 km from the middle of the area, began a volume at 05:21 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, 5.4 hours before the alert went out and 203 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: 613 J/kg
Mixed-layer CIN: -145 J/kg
Mixed-layer LCL: 997 m above ground
0-6 km bulk shear: 30 kt
0-1 km storm-relative helicity: 15 m²/s²
0-3 km storm-relative helicity: 9 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.5

Open this sounding in Storm Lab

The text

As transmitted.

281 
WWUS84 KOUN 180521
SPSOUN

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE Norman OK
1221 AM CDT Tue May 18 2021
 
OKZ009-010-014>016-021-022-180545-
Woodward OK-Roger Mills OK-Washita OK-Dewey OK-Beckham OK-Custer OK-
Ellis OK-
1221 AM CDT Tue May 18 2021

...SIGNIFICANT WEATHER ADVISORY FOR southwestern Woodward...eastern
Roger Mills...northwestern Washita...western Dewey...northeastern
Beckham...western Custer and southeastern Ellis Counties Until 1245
AM CDT...

AT 1220 AM CDT, strong thunderstorms were along a line extending from
near Harmon to near Angora to near Carter, moving north at 35 MPH.

HAZARDS INCLUDE...
Hail up to one-half inch diameter... 
Wind gusts to 50 MPH...
Minor flooding in areas of poor drainage... 
Heavy rain can lead to reduced visibility... 
Frequent cloud to ground lightning... 

Locations impacted include...
Elk City, Vici, Hammon, Leedey, Carter, Camargo, Sharon, Strong City,
Retrop, Angora, Moorewood, Harmon and Berlin.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3629 9957 3628 9928 3592 9922 3514 9936
      3516 9960 3576 9968 3611 9967
TIME...MOT...LOC 0520Z 188DEG 30KT 3612 9956 3581 9948 3521 9952 

$$

03

The office that day

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

Issued	Product	Office	Counties	Lasted
May 17, 10:03 PM CDT	Special Weather Statement	OUN	Jackson	27 min
May 17, 10:29 PM CDT	Special Weather Statement	OUN	Harmon	31 min
May 17, 10:42 PM CDT	Severe Thunderstorm Warning	OUN	Harmon, Jackson	33 min
May 17, 11:12 PM CDT	Special Weather Statement	OUN	Jackson	33 min
May 17, 11:19 PM CDT	Special Weather Statement	OUN	Tillman	41 min
May 17, 11:29 PM CDT	Special Weather Statement	OUN	Ellis, Harper, Roger Mills	46 min
May 17, 11:43 PM CDT	Severe Thunderstorm Warning	OUN	Ellis, Woodward	32 min
May 18, 12:19 AM CDT	Special Weather Statement	OUN	Woodward	56 min
May 18, 12:44 AM CDT	Special Weather Statement	OUN	Washita	61 min
May 18, 1:02 AM CDT	Special Weather Statement	OUN	Woodward	58 min
May 18, 1:03 AM CDT	Special Weather Statement	OUN	Dewey	57 min
May 18, 1:06 AM CDT	Special Weather Statement	OUN	Jefferson	24 min
May 18, 1:28 AM CDT	Special Weather Statement	OUN	Major	47 min
May 18, 2:00 AM CDT	Special Weather Statement	OUN	Comanche, Kiowa, Tillman	30 min
May 18, 2:35 AM CDT	Special Weather Statement	OUN	Comanche, Cotton, Tillman	55 min
May 18, 2:48 AM CDT	Special Weather Statement	OUN	Kingfisher	42 min
May 18, 2:56 AM CDT	Special Weather Statement	OUN	Garfield	49 min
May 18, 3:36 AM CDT	Special Weather Statement	OUN	Kingfisher	39 min
May 18, 12:03 PM CDT	Special Weather Statement	OUN	Noble	27 min
May 18, 4:14 PM CDT	Special Weather Statement	OUN	Alfalfa	31 min
May 18, 4:44 PM CDT	Special Weather Statement	OUN	Garfield	46 min
May 17, 7:00 PM CDT	Severe Thunderstorm Warning	OUN	Baylor, Knox	45 min
May 17, 7:11 PM CDT	Special Weather Statement	OUN	Wilbarger	34 min
May 17, 7:22 PM CDT	Areal Flood Advisory	OUN	Knox	3 hr
May 17, 7:33 PM CDT	Severe Thunderstorm Warning	OUN	Baylor, Knox	42 min
May 17, 8:00 PM CDT	Severe Thunderstorm Warning	OUN	Archer, Baylor, Wichita	45 min
May 17, 8:17 PM CDT	Severe Thunderstorm Warning	OUN	Archer, Wichita	23 min
May 17, 8:19 PM CDT	Areal Flood Advisory	OUN	Baylor	3 hr
May 17, 8:33 PM CDT	Areal Flood Advisory	OUN	Archer	3 hr
May 17, 9:28 PM CDT	Areal Flood Advisory	OUN	Wichita	3 hr

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.