Alert archive / Oklahoma / Special Weather Statements in 2021

Special Weather Statement, NWS Norman, OK

August 1, 2021Canadian County, Oklahoma

NWS Norman, OK issued this special weather statement at Aug 1, 2021, 4:18 AM CDT for Canadian County, Oklahoma. It was in force for 42 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: Aug 1, 2021, 4:18 AM CDT (09:18 UTC)
Expired: Aug 1, 2021, 5:00 AM CDT
In force: 42 min
Issued by: NWS Norman, OK

County Canadian County, OK

The radar

The Norman radar (KTLX), 67 km from the middle of the area, began a volume at 09:19 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, 9.3 hours before the alert went out and 64 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: 1977 J/kg
Mixed-layer CIN: -6 J/kg
Mixed-layer LCL: 1902 m above ground
0-6 km bulk shear: 8 kt
0-1 km storm-relative helicity: 28 m²/s²
0-3 km storm-relative helicity: 17 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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 Aug 1, 1:22 AM CDT, 2 hours 56 minutes earlier.

Area forecast discussion, Aug 1, 1:22 AM CDT, 2 hours 56 minutes before

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Hazardous weather outlook, Jul 31, 11:31 AM CDT, 16 hours 47 minutes before

Hazardous Weather Outlook...UPDATED
National Weather Service Norman OK
1131 AM CDT Sat Jul 31 2021

OKZ004>048-050>052-TXZ083>090-011645-
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-
1131 AM CDT Sat Jul 31 2021

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

.DAY ONE...Today and Tonight...

.Heat...
Hot and humid conditions will continue this afternoon with heat
index values of 102 to 110 degrees.

.Thunderstorms...
Thunderstorm chances will return to the region this evening and
tonight. There is a marginal risk for severe storms across
northern Oklahoma. Damaging winds will be the main threat.

.DAYS TWO THROUGH SEVEN...Sunday through Friday...

.Thunderstorms...
Thunderstorm chances will continue Sunday and Sunday night in
association with a cold front. Some storms may produce strong wind
gusts and heavy rain. Storms may linger around southern Oklahoma
and north Texas into Monday morning.

Low chances for scattered thunderstorms will return Wednesday and
Thursday.

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, Jul 31, 10:30 PM CDT, 5 hours 48 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE Norman OK
1030 PM CDT Sat Jul 31 2021

OKZ007-012-010400-
Garfield OK-Grant OK-
1030 PM CDT Sat Jul 31 2021

...SIGNIFICANT WEATHER ADVISORY FOR north central Garfield and south
central Grant Counties Until 1100 PM CDT...

AT 1028 PM CDT, strong thunderstorms were along a line extending from
3 miles west of Jefferson to near Kremlin, moving east at 15 MPH.

HAZARDS INCLUDE...
Hail up to one-half inch diameter...
Wind gusts to 40 MPH...
Heavy rain can lead to reduced visibility...

LAT...LON 3680 9773 3654 9772 3656 9791 3674 9793
TIME...MOT...LOC 0328Z 266DEG 12KT 3671 9786 3658 9786

JT

Special weather statement, Jul 31, 11:03 PM CDT, 5 hours 15 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE Norman OK
1103 PM CDT Sat Jul 31 2021

OKZ007-012-010430-
Garfield OK-Grant OK-
1103 PM CDT Sat Jul 31 2021

...SIGNIFICANT WEATHER ADVISORY FOR north central Garfield and south
central Grant Counties Until 1130 PM CDT...

AT 1100 PM CDT, A strong thunderstorm was reported near Pond Creek,
moving east at 10 MPH.

HAZARDS INCLUDE...
Pea-sized hail...
Wind gusts to 40 MPH...
Heavy rain can lead to reduced visibility...

LAT...LON 3657 9789 3668 9783 3667 9766 3655 9771
TIME...MOT...LOC 0400Z 292DEG 10KT 3665 9777

JT

Special weather statement, Jul 31, 11:49 PM CDT, 4 hours 29 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE Norman OK
1149 PM CDT Sat Jul 31 2021

OKZ008-013-010530-
Kay OK-Noble OK-
1149 PM CDT Sat Jul 31 2021

...SIGNIFICANT WEATHER ADVISORY FOR southeastern Kay and Noble
Counties Until 1230 AM CDT...

AT 1148 PM CDT, strong thunderstorms were along a line extending from
near Kildare to 5 miles southeast of Tonkawa to 5 miles southeast of
Billings, moving southeast at 20 MPH.

HAZARDS INCLUDE...
Hail up to the size of nickels...
Wind gusts over 50 MPH...
Minor flooding in areas of poor drainage...
Heavy rain can lead to reduced visibility...
Frequent cloud to ground lightning...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3678 9676 3677 9682 3674 9683 3675 9689
      3668 9693 3670 9704 3668 9706 3660 9704
      3659 9706 3658 9700 3660 9691 3656 9689
      3651 9703 3640 9703 3621 9719 3646 9746
      3649 9746 3668 9730 3689 9703
TIME...MOT...LOC 0448Z 306DEG 16KT 3680 9703 3664 9723 3649 9736

Zwink

Special weather statement, Aug 1, 12:36 AM CDT, 3 hours 42 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE Norman OK
1236 AM CDT Sun Aug 1 2021

OKZ013-020-010615-
Payne OK-Noble OK-
1236 AM CDT Sun Aug 1 2021

...SIGNIFICANT WEATHER ADVISORY FOR central Payne and central Noble
Counties Until 115 AM CDT...

AT 1235 AM CDT, strong thunderstorms were along a line extending from
5 miles southeast of Marland to near Perry, moving southeast at 15
MPH.

HAZARDS INCLUDE...
Hail up to the size of nickels...
Wind gusts over 50 MPH...
Minor flooding in areas of poor drainage...
Heavy rain can lead to reduced visibility...
Frequent cloud to ground lightning...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3658 9701 3654 9695 3653 9699 3651 9701
      3651 9703 3633 9703 3633 9692 3625 9692
      3624 9685 3595 9705 3626 9738 3659 9710
      3660 9706
TIME...MOT...LOC 0535Z 325DEG 14KT 3652 9707 3627 9729

Zwink

Special weather statement, Aug 1, 2:28 AM CDT, 1 hour 50 minutes before

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Special weather statement, Aug 1, 4:18 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
Jul 31, 7:37 PM CDT	Special Weather Statement	OUN	Alfalfa	38 min
Jul 31, 7:42 PM CDT	Special Weather Statement	OUN	Woods	18 min
Jul 31, 7:45 PM CDT	Special Weather Statement	OUN	Alfalfa	30 min
Jul 31, 7:54 PM CDT	Special Weather Statement	OUN	Harper	36 min
Jul 31, 8:04 PM CDT	Special Weather Statement	OUN	Alfalfa	26 min
Jul 31, 8:45 PM CDT	Special Weather Statement	OUN	Woodward	30 min
Jul 31, 8:56 PM CDT	Special Weather Statement	OUN	Harper	34 min
Jul 31, 9:14 PM CDT	Special Weather Statement	OUN	Harper	31 min
Jul 31, 9:18 PM CDT	Special Weather Statement	OUN	Grant	27 min
Jul 31, 9:24 PM CDT	Special Weather Statement	OUN	Kay	21 min
Jul 31, 9:27 PM CDT	Special Weather Statement	OUN	Harper	18 min
Jul 31, 9:31 PM CDT	Special Weather Statement	OUN	Woodward	29 min
Jul 31, 9:46 PM CDT	Special Weather Statement	OUN	Kay	29 min
Jul 31, 10:26 PM CDT	Special Weather Statement	OUN	Kay	34 min
Jul 31, 10:30 PM CDT	Special Weather Statement	OUN	Grant	30 min
Jul 31, 10:49 PM CDT	Areal Flood Advisory	OUN	Woods	3 hr
Jul 31, 11:03 PM CDT	Special Weather Statement	OUN	Grant	27 min
Jul 31, 11:29 PM CDT	Areal Flood Advisory	OUN	Kay	3 hr
Jul 31, 11:49 PM CDT	Special Weather Statement	OUN	Noble	41 min
Jul 31, 11:59 PM CDT	Areal Flood Advisory	OUN	Ellis, Harper	3 hr
Aug 1, 12:05 AM CDT	Flash Flood Warning	OUN	Kay	3 hr
Aug 1, 12:36 AM CDT	Special Weather Statement	OUN	Noble, Payne	39 min
Aug 1, 2:25 AM CDT	Areal Flood Advisory	OUN	Garfield	3 hr
Aug 1, 2:28 AM CDT	Special Weather Statement	OUN	Logan	47 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.