Alert archive / Oklahoma / Special Weather Statements in 2021

Special Weather Statement, NWS Norman, OK

September 8, 2021Cotton County, Oklahoma

NWS Norman, OK issued this special weather statement at Sep 8, 2021, 12:40 AM CDT for Cotton County, Oklahoma. It was in force for 35 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: Sep 8, 2021, 12:40 AM CDT (05:40 UTC)
Expired: Sep 8, 2021, 1:15 AM CDT
In force: 35 min
Issued by: NWS Norman, OK
Hail: 0.25 in
Wind: 40

County Cotton County, OK

The radar

The Altus AFB radar (KFDR), 34 km from the middle of the area, began a volume at 05:40 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, 5.7 hours before the alert went out and 144 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: 2037 J/kg
Mixed-layer CIN: -90 J/kg
Mixed-layer LCL: 1991 m above ground
0-6 km bulk shear: 22 kt
0-1 km storm-relative helicity: 15 m²/s²
0-3 km storm-relative helicity: 159 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 7.0

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 Sep 7, 11:24 PM CDT, 1 hour 16 minutes earlier.

Area forecast discussion, Sep 7, 11:24 PM CDT, 1 hour 16 minutes before

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Hazardous weather outlook, Sep 7, 10:47 PM CDT, 1 hour 53 minutes before

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In the hours before

Special weather statement, Sep 7, 8:21 PM CDT, 4 hours 19 minutes before

Special Weather Statement
National Weather Service Norman OK
821 PM CDT Tue Sep 7 2021

OKZ014-016-021-080145-
Roger Mills OK-Beckham OK-Custer OK-
821 PM CDT Tue Sep 7 2021

...A strong thunderstorm will impact portions of southeastern Roger
Mills, southwestern Custer and northeastern Beckham Counties through
845 PM CDT...

At 821 PM CDT, Doppler radar was tracking a strong thunderstorm near
Hammon, moving southeast at 25 mph.

HAZARD...Wind gusts up to 50 mph and half inch hail.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects. Minor damage to outdoor objects is
         possible.

Locations impacted include...
Hammon and Foss Reservoir.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

This storm may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.

&&

LAT...LON 3573 9936 3548 9917 3546 9927 3547 9936
      3545 9937 3542 9955 3565 9956
TIME...MOT...LOC 0121Z 333DEG 21KT 3563 9942

MAX HAIL SIZE...0.50 IN
MAX WIND GUST...50 MPH

30

Special weather statement, Sep 7, 8:46 PM CDT, 3 hours 54 minutes before

Special Weather Statement
National Weather Service Norman OK
846 PM CDT Tue Sep 7 2021

OKZ016-022-080215-
Washita OK-Custer OK-
846 PM CDT Tue Sep 7 2021

...Strong thunderstorms will impact portions of northwestern Washita
and western Custer Counties through 915 PM CDT...

At 845 PM CDT, Doppler radar was tracking strong thunderstorms from
near Butler to southwest of Foss Reservoir. Movement was south at 15
mph.

HAZARD...Wind gusts up to 50 mph and half inch hail.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects. Minor damage to outdoor objects is
         possible.

Locations impacted include...
Clinton, Canute, Butler, Foss, Foss Reservoir and Stafford.

This includes Interstate 40 between mile markers 43 and 65.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

These storms may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.

&&

LAT...LON 3579 9915 3544 9894 3536 9936 3553 9937
      3555 9936 3555 9937 3558 9937
TIME...MOT...LOC 0145Z 352DEG 15KT 3572 9917 3552 9933

MAX HAIL SIZE...0.50 IN
MAX WIND GUST...50 MPH

30

Special weather statement, Sep 7, 9:11 PM CDT, 3 hours 29 minutes before

Special Weather Statement
National Weather Service Norman OK
911 PM CDT Tue Sep 7 2021

OKZ021-080245-
Beckham OK-
911 PM CDT Tue Sep 7 2021

...Strong thunderstorms will impact portions of southwestern Beckham
County through 945 PM CDT...

At 911 PM CDT, Doppler radar was tracking strong thunderstorms along
a line extending from 4 miles south of Sweetwater to 6 miles west of
Sayre. Movement was south at 20 mph.

HAZARD...Wind gusts up to 50 mph and half inch hail.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects. Minor damage to outdoor objects is
         possible.

Locations impacted include...
Erick, Texola and Delhi.

This includes Interstate 40 between mile markers 1 and 18.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

These storms may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.

&&

LAT...LON 3542 9997 3533 9968 3512 9968 3512 9974
      3514 9999
TIME...MOT...LOC 0211Z 357DEG 17KT 3536 9990 3527 9975

MAX HAIL SIZE...0.50 IN
MAX WIND GUST...50 MPH

30

Special weather statement, Sep 7, 9:23 PM CDT, 3 hours 17 minutes before

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Special weather statement, Sep 7, 9:40 PM CDT, 3 hours before

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Special weather statement, Sep 8, 12:40 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
Sep 7, 7:15 PM CDT	Special Weather Statement	OUN	Roger Mills	30 min
Sep 7, 7:21 PM CDT	Severe Thunderstorm Warning Considerable damage threat	OUN	Blaine, Dewey, Kingfisher, Major	39 min
Sep 7, 7:43 PM CDT	Special Weather Statement	OUN	Noble	32 min
Sep 7, 7:51 PM CDT	Severe Thunderstorm Warning Considerable damage threat	OUN	Blaine, Canadian, Custer, Dewey, Kingfisher	39 min
Sep 7, 8:02 PM CDT	Severe Thunderstorm Warning	OUN	Logan, Noble, Payne	25 min
Sep 7, 8:21 PM CDT	Special Weather Statement	OUN	Custer	24 min
Sep 7, 8:27 PM CDT	Severe Thunderstorm Warning	OUN	Blaine, Custer, Dewey	33 min
Sep 7, 8:46 PM CDT	Special Weather Statement	OUN	Custer	29 min
Sep 7, 9:11 PM CDT	Special Weather Statement	OUN	Beckham	34 min
Sep 7, 9:19 PM CDT	Severe Thunderstorm Warning	OUN	Beckham, Greer	41 min
Sep 7, 9:23 PM CDT	Special Weather Statement	OUN	Washita	37 min
Sep 7, 9:40 PM CDT	Special Weather Statement	OUN	Kay	35 min
Sep 8, 4:55 AM CDT	Special Weather Statement	OUN	Bryan	35 min
Sep 8, 5:31 AM CDT	Special Weather Statement	OUN	Bryan	29 min
Sep 8, 6:10 AM CDT	Special Weather Statement	OUN	Bryan	35 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.