Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2023

Severe Thunderstorm Warning 641, NWS Norman, OK

July 21, 2023Garfield County, Noble County, Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at Jul 21, 2023, 3:54 AM CDT for Garfield County, Noble County, Oklahoma. It was in force for 36 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Jul 21, 2023, 3:54 AM CDT (08:54 UTC)
Expired: Jul 21, 2023, 4:30 AM CDT
In force: 36 min
Issued by: NWS Norman, OK
Area: Storm-based polygon
Tornado: Possible
Damage threat: Destructive
Hail: 0.75 in
Wind: 80.0 mph

Counties Garfield County, OK, Noble County, OK

The radar

The Vance AFB radar (KVNX), 68 km from the middle of the area, began a volume at 08:54 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Jul 20, 11:53 PM CDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Norman, OK (KOUN), launched 00:00Z, 8.9 hours before the alert went out and 130 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: 1495 J/kg
Mixed-layer CIN: -206 J/kg
Mixed-layer LCL: 1827 m above ground
0-6 km bulk shear: 26 kt
0-1 km storm-relative helicity: 66 m²/s²
0-3 km storm-relative helicity: 130 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.4

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this severe thunderstorm warning 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 severe thunderstorm warning went out at Jul 21, 2:18 AM CDT, 1 hour 36 minutes earlier.

Area forecast discussion, Jul 21, 2:18 AM CDT, 1 hour 36 minutes before

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Hazardous weather outlook, Jul 21, 12:03 AM CDT, 3 hours 51 minutes before

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In the hours before

Local storm report, Jul 21, 2:36 AM CDT, 1 hour 18 minutes before

Preliminary Local Storm Report
National Weather Service Norman OK
236 AM CDT Fri Jul 21 2023

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0155 AM     Tstm Wnd Gst     Gage                    36.32N 99.76W
07/21/2023  M56 MPH          Ellis              OK   ASOS

&&

Local storm report, Jul 21, 2:50 AM CDT, 1 hour 4 minutes before

Preliminary Local Storm Report
National Weather Service Norman OK
250 AM CDT Fri Jul 21 2023

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0230 AM     Tstm Wnd Gst     4 WNW Camargo           36.04N 99.35W
07/21/2023  M54 MPH          Dewey              OK   Mesonet

&&

Special weather statement, Jul 21, 3:08 AM CDT, 46 minutes before

Special Weather Statement
National Weather Service Norman OK
308 AM CDT Fri Jul 21 2023

OKZ015-017-018-210845-
Kingfisher OK-Dewey OK-Blaine OK-
308 AM CDT Fri Jul 21 2023

...Strong thunderstorms will impact portions of northwestern
Kingfisher, Blaine and eastern Dewey Counties through 345 AM CDT...

At 308 AM CDT, Doppler radar was tracking strong thunderstorms along
a line extending from near Canton Lake to 5 miles east of Putnam.
Movement was east at 55 mph.

HAZARD...Wind gusts up to 50 mph.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects.

Locations impacted include...
Watonga, Taloga, Okeene, Seiling, Canton, Longdale, Hitchcock,
Oakwood, Putnam, Canton Lake, Eagle City, Fay, Homestead, Hucmac,
Southard, and Omega.

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 3616 9896 3616 9810 3574 9824 3580 9863
      3581 9863 3581 9873 3586 9909
TIME...MOT...LOC 0808Z 273DEG 49KT 3610 9860 3588 9888

MAX HAIL SIZE...0.00 IN
MAX WIND GUST...50 MPH

30

Local storm report, Jul 21, 3:54 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 21, 12:50 AM CDT	Severe Thunderstorm Warning Considerable damage threat	OUN	Ellis, Harper	40 min
Jul 21, 1:29 AM CDT	Severe Thunderstorm Warning Considerable damage threat	OUN	Ellis, Harper, Woods, Woodward	46 min
Jul 21, 2:11 AM CDT	Severe Thunderstorm Warning Considerable damage threat	OUN	Harper, Major, Woods, Woodward	49 min
Jul 21, 2:31 AM CDT	Areal Flood Advisory	OUN	Harper, Woods, Woodward	3 hr
Jul 21, 2:45 AM CDT	Severe Thunderstorm Warning Considerable damage threat	OUN	Alfalfa, Major, Woods	60 min
Jul 21, 3:06 AM CDT	Areal Flood Advisory	OUN	Alfalfa, Major, Woods, Woodward	4 hr
Jul 21, 3:08 AM CDT	Special Weather Statement	OUN	Blaine, Dewey	37 min
Jul 21, 3:18 AM CDT	Severe Thunderstorm Warning	OUN	Alfalfa, Garfield, Grant, Major	42 min
Jul 21, 3:35 AM CDT	Severe Thunderstorm Warning	OUN	Blaine, Kingfisher	25 min
Jul 21, 4:01 AM CDT	Severe Thunderstorm Warning	OUN	Garfield, Kingfisher, Logan, Noble, Payne	44 min
Jul 21, 4:08 AM CDT	Areal Flood Advisory	OUN	Garfield	3 hr
Jul 21, 4:18 AM CDT	Special Weather Statement	OUN	Canadian, Oklahoma	27 min
Jul 21, 4:21 AM CDT	Severe Thunderstorm Warning Considerable damage threat	OUN	Garfield, Kay, Noble	54 min
Jul 21, 4:42 AM CDT	Severe Thunderstorm Warning	OUN	Lincoln, Logan, Payne	48 min
Jul 21, 4:45 AM CDT	Special Weather Statement	OUN	Oklahoma	30 min
Jul 21, 5:29 AM CDT	Areal Flood Advisory	OUN	Grant, Kay	4 hr
Jul 21, 11:21 AM CDT	River Flood Advisory	OUN	Woodward	9 hr
Jul 21, 4:10 PM CDT	River Flood Advisory	OUN	Alfalfa, Woods	16 hr

Nearby

Severe Thunderstorm Warnings in Oklahoma, 2023 Every severe thunderstorm warning in 2023

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.