Alert archive / Oklahoma / Special Weather Statements in 2021

Special Weather Statement, NWS Norman, OK

July 16, 2021Johnston County, Oklahoma

NWS Norman, OK issued this special weather statement at Jul 16, 2021, 8:21 PM CDT for Johnston 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: Jul 16, 2021, 8:21 PM CDT (01:21 UTC)
Expired: Jul 16, 2021, 8:45 PM CDT
In force: 24 min
Issued by: NWS Norman, OK

County Johnston County, OK

The radar

The Norman radar (KTLX), 108 km from the middle of the area, began a volume at 01:21 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

Fort Worth, TX (KFWD), launched 00:00Z, 1.4 hours before the alert went out and 186 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: 1077 J/kg
Mixed-layer CIN: -24 J/kg
Mixed-layer LCL: 1456 m above ground
0-6 km bulk shear: 13 kt
0-1 km storm-relative helicity: 35 m²/s²
0-3 km storm-relative helicity: 81 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

640 
WWUS84 KOUN 170121
SPSOUN

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE Norman OK
821 PM CDT Fri Jul 16 2021
 
OKZ041-042-047-170145-
Johnston OK-Pontotoc OK-Murray OK-
821 PM CDT Fri Jul 16 2021

...SIGNIFICANT WEATHER ADVISORY FOR northwestern Johnston...south
central Pontotoc and east central Murray Counties Until 845 PM CDT...

AT 818 PM CDT, a strong thunderstorm was located near Mill Creek,
moving northeast at 10 MPH.

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

LAT...LON 3434 9683 3446 9694 3466 9677 3445 9657
TIME...MOT...LOC 0118Z 231DEG 9KT 3445 9684 

$$

Zwink

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 16, 8:25 PM CDT	Special Weather Statement	OUN	Kay	35 min
Jul 16, 9:10 PM CDT	Areal Flood Advisory	OUN	Grant, Kay	3 hr
Jul 16, 9:31 PM CDT	Severe Thunderstorm Warning	OUN	Garfield, Grant, Kay	59 min
Jul 16, 10:08 PM CDT	Severe Thunderstorm Warning	OUN	Garfield, Grant	52 min
Jul 16, 10:51 PM CDT	Severe Thunderstorm Warning	OUN	Alfalfa, Garfield, Grant, Major	39 min
Jul 16, 11:23 PM CDT	Areal Flood Advisory	OUN	Alfalfa, Garfield, Grant	3 hr
Jul 16, 11:41 PM CDT	Special Weather Statement	OUN	Kay	34 min
Jul 16, 11:47 PM CDT	Severe Thunderstorm Warning	OUN	Kay	26 min
Jul 17, 12:09 AM CDT	Areal Flood Advisory	OUN	Kay	3 hr
Jul 17, 12:25 AM CDT	Special Weather Statement	OUN	Kay	35 min
Jul 17, 11:29 AM CDT	Special Weather Statement	OUN	Alfalfa	46 min
Jul 17, 12:07 PM CDT	Special Weather Statement	OUN	Major	38 min
Jul 17, 12:18 PM CDT	Severe Thunderstorm Warning	OUN	Alfalfa, Major, Woods	27 min
Jul 17, 12:24 PM CDT	Areal Flood Advisory	OUN	Alfalfa, Major, Woods	3 hr
Jul 17, 12:44 PM CDT	Severe Thunderstorm Warning	OUN	Blaine, Kingfisher, Major	46 min
Jul 17, 1:04 PM CDT	Special Weather Statement	OUN	Dewey	26 min
Jul 17, 1:08 PM CDT	Special Weather Statement	OUN	Roger Mills	52 min
Jul 17, 1:23 PM CDT	Severe Thunderstorm Warning	OUN	Ellis, Roger Mills	17 min
Jul 17, 1:32 PM CDT	Areal Flood Advisory	OUN	Blaine, Garfield, Kingfisher, Logan, Major	3 hr
Jul 17, 1:36 PM CDT	Areal Flood Advisory	OUN	Blaine, Dewey	3 hr
Jul 17, 1:43 PM CDT	Special Weather Statement	OUN	Logan	47 min
Jul 17, 1:47 PM CDT	Special Weather Statement	OUN	Kingfisher	43 min
Jul 17, 1:58 PM CDT	Special Weather Statement	OUN	Blaine	32 min
Jul 17, 2:10 PM CDT	Special Weather Statement	OUN	Ellis	35 min
Jul 17, 2:21 PM CDT	Special Weather Statement	OUN	Canadian, Logan	24 min
Jul 17, 2:24 PM CDT	Areal Flood Advisory	OUN	Kingfisher, Logan	3 hr
Jul 17, 2:39 PM CDT	Special Weather Statement	OUN	Canadian	66 min
Jul 17, 2:42 PM CDT	Severe Thunderstorm Warning	OUN	Ellis, Woodward	36 min
Jul 17, 2:44 PM CDT	Areal Flood Advisory	OUN	Dewey, Ellis, Roger Mills, Woodward	3 hr
Jul 17, 2:48 PM CDT	Severe Thunderstorm Warning	OUN	Canadian, Kingfisher	42 min
Jul 17, 2:57 PM CDT	Areal Flood Advisory	OUN	Blaine, Caddo	3 hr
Jul 17, 3:06 PM CDT	Areal Flood Advisory	OUN	Canadian, Kingfisher	3 hr
Jul 17, 3:12 PM CDT	Special Weather Statement	OUN	Logan	48 min
Jul 17, 3:21 PM CDT	Special Weather Statement	OUN	Caddo	54 min
Jul 17, 3:32 PM CDT	Special Weather Statement	OUN	Oklahoma	58 min
Jul 17, 3:33 PM CDT	Special Weather Statement	OUN	Canadian	27 min
Jul 17, 3:38 PM CDT	Areal Flood Advisory	OUN	Oklahoma	112 min
Jul 17, 4:01 PM CDT	Special Weather Statement	OUN	Caddo	44 min
Jul 17, 4:03 PM CDT	Special Weather Statement	OUN	Grady	42 min
Jul 17, 4:30 PM CDT	Special Weather Statement	OUN	Greer	45 min
Jul 17, 4:34 PM CDT	Severe Thunderstorm Warning	OUN	Caddo, Comanche, Grady, Kiowa	41 min
Jul 17, 4:43 PM CDT	Special Weather Statement	OUN	Cleveland	62 min
Jul 17, 4:53 PM CDT	Special Weather Statement	OUN	Greer	67 min
Jul 17, 5:06 PM CDT	Severe Thunderstorm Warning	OUN	Harmon	37 min
Jul 17, 5:41 PM CDT	Severe Thunderstorm Warning	OUN	Tillman	49 min
Jul 17, 6:50 PM CDT	Special Weather Statement	OUN	Cotton	25 min
Jul 17, 5:30 PM CDT	Special Weather Statement	OUN	Wichita	30 min
Jul 17, 5:37 PM CDT	Special Weather Statement	OUN	Wichita	23 min
Jul 17, 6:18 PM CDT	Special Weather Statement	OUN	Hardeman	42 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.