Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 483, NWS Norman, OK

September 7, 2021Logan County, Noble County, Payne County, Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at Sep 7, 2021, 8:02 PM CDT for Logan County, Noble County, Payne County, Oklahoma. It was in force for 25 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 7, 2021, 8:02 PM CDT (01:02 UTC)
Expired: Sep 7, 2021, 8:27 PM CDT
In force: 25 min
Issued by: NWS Norman, OK
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Logan County, OK, Noble County, OK, Payne County, OK

The radar

The Vance AFB radar (KVNX), 89 km from the middle of the area, began a volume at 01:05 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.

Did it verify

Not verified. The Iowa Environmental Mesonet's Cow found no qualifying storm report inside this severe thunderstorm warning while it was in force. That is not proof nothing happened: reports are thin where few people live.

Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.

The nearest sounding before it

Norman, OK (KOUN), launched 00:00Z, 1.0 hours before the alert went out and 118 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.

150 
WUUS54 KOUN 080102
SVROUN
OKC083-103-119-080145-
/O.NEW.KOUN.SV.W.0483.210908T0102Z-210908T0145Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Norman OK
802 PM CDT Tue Sep 7 2021

The National Weather Service in Norman has issued a

* Severe Thunderstorm Warning for...
  Southwestern Noble County in northern Oklahoma...
  North central Logan County in central Oklahoma...
  Northwestern Payne County in central Oklahoma...

* Until 845 PM CDT.

* At 802 PM CDT, a severe thunderstorm was located 4 miles north of
  Perry, moving south at 20 mph.

  HAZARD...60 mph wind gusts and quarter size hail.

  SOURCE...Radar indicated.

  IMPACT...Hail damage to vehicles is expected. Expect wind damage 
           to roofs, siding, and trees.

* Locations impacted include...
  Stillwater, Perry, Orlando, Lake Carl Blackwell and Lake Mcmurtry. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 3640 9741 3641 9720 3611 9711 3609 9744
TIME...MOT...LOC 0102Z 345DEG 18KT 3635 9729 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

30

1 follow-up statement

995 
WWUS54 KOUN 080127
SVSOUN

Severe Weather Statement
National Weather Service Norman OK
827 PM CDT Tue Sep 7 2021

OKC083-103-119-080137-
/O.CAN.KOUN.SV.W.0483.000000T0000Z-210908T0145Z/
Noble OK-Logan OK-Payne OK-
827 PM CDT Tue Sep 7 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHWESTERN NOBLE...NORTH
CENTRAL LOGAN AND NORTHWESTERN PAYNE COUNTIES IS CANCELLED...
                 
The storm which prompted the warning has weakened below severe
limits, therefore the warning has been cancelled.  However gusty
winds are still possible with this thunderstorm.

LAT...LON 3640 9741 3641 9720 3611 9711 3609 9744
TIME...MOT...LOC 0127Z 345DEG 18KT 3622 9725 

$$

30

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 Sep 7, 5:54 PM CDT, 2 hours 8 minutes earlier.

Area forecast discussion, Sep 7, 5:54 PM CDT, 2 hours 8 minutes before

Area Forecast Discussion
National Weather Service Norman OK
554 PM CDT Tue Sep 7 2021

...New AVIATION...

.SHORT TERM...
(This evening through Wednesday)
Issued at 206 PM CDT Tue Sep 7 2021

Evolving MCV evident over northwest Texas with exiting area of
convection. This should have little or no impact on western north
Texas going into the short term period.

Cold front will be entering northwest portions of Oklahoma shortly,
with steady but relatively slow progress southward through tonight.
Deeper pre-frontal mixing as afternoon progresses will help erode
most of the cap that is in place across western/central/northern
Oklahoma, and with sufficient moisture return and convergence near
mentioned front, we should see scattered storm development late this
afternoon and early this evening from west-central Oklahoma east
northeast into portions of north-central and central Oklahoma. With
the deeply mixed environment yielding DCAPE values in excess of 1500
J/kg, damaging wind gusts will be the primary severe weather concern
with the strongest storms through at least early evening. After
sunset, ML CIN should quickly increase which will allow any
remaining storms to become more elevated in nature and is expected
to yield a decrease in coverage and intensity. However, with
increasing mid-upper level flow and weak upper trough moving into
northeast Oklahoma overnight, we could see some elevated storm
activity continuing into southeast portions of Oklahoma tomorrow
morning. If these storms can be maintained, they should stay sub
severe overnight.

Slightly cooler temperatures still look like a good bet for tomorrow
with dominant northeast to easterly low level flow. Most areas
should see highs at least 5 to 10 degrees cooler than those seen
today, with parts of north-central Oklahoma possibly see highs 15
degrees cooler than those see this afternoon (mid 80s as opposed to
100). Although less hot, Wednesdays highs will remain slightly above
average for a majority of the forecast area.

&&

.LONG TERM...
(Wednesday night through next Monday)
Issued at 206 PM CDT Tue Sep 7 2021

Dry forecast last half of the week into the weekend. Models show the
center of the upper high shifting into the southern Rockies region
by late this week. The high then becomes E-W oriented over the
southern U.S. over the weekend. Hot, above average, temperatures are
expected this week into the weekend, with triple digit highs
possible across portions of the fa Friday and Saturday. The humidity
is not expected to be as high as the last few weeks with lower
dewpoints over the area. So heat index values of 105+ are less
likely this go around. Some models show a shortwave moving across
the central U.S. early/middle next week which may bring a chance for
rain to parts of the fa but right now it looks like most areas will
remain dry into at least early next week.

&&

.AVIATION...
(00Z TAFS)
Issued at 550 PM CDT Tue Sep 7 2021

A cold front located in northwest Oklahoma will continue to slide
south this evening. There will be a chance for a few thunderstorms
along and near this boundary tonight. They may impact sites across
northern and central sections of Oklahoma. Have maintained a
mention at OKC/OUN/SWO with a VCTS at PNC and CSM. Have also gone
ahead and put a TEMPO at CSM this evening. Winds will shift to the
north and northeast behind the front with a few gusts this evening
around 20kts, mainly at WWR. Mainly mid/high clouds otherwise
tonight with clear skies most locations tomorrow.

&&

.UPPER AIR...
Issued at 206 PM CDT Tue Sep 7 2021

An Upper Air flight is planned for 0Z Wednesday (9/8) this evening.

&&

.PRELIMINARY POINT TEMPS/POPS...
Oklahoma City OK  67  88  64  92 /  30   0   0   0
Hobart OK         68  91  63  95 /  20   0   0   0
Wichita Falls TX  71  92  64  94 /  10  10   0   0
Gage OK           61  87  61  95 /   0   0   0   0
Ponca City OK     61  86  60  92 /  30   0   0   0
Durant OK         68  90  63  92 /  30  30   0   0

&&

.OUN WATCHES/WARNINGS/ADVISORIES...
OK...None.
TX...None.
&&

SHORT TERM...11
LONG TERM....25
AVIATION...30

Hazardous weather outlook, Sep 7, 11:21 AM CDT, 8 hours 41 minutes before

Hazardous Weather Outlook...UPDATED
National Weather Service Norman OK
1121 AM CDT Tue Sep 7 2021

OKZ004>048-050>052-TXZ083>090-081630-
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-
1121 AM CDT Tue Sep 7 2021

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

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

.Thunderstorms...
There is a marginal risk for severe thunderstorms late this
afternoon and evening along a cold front which will move through
northern Oklahoma. If severe storms do occur, damaging wind would
be the primary hazard. Storms could continue into the overnight
hours in parts of southern and southeastern Oklahoma, but should
remain below severe criteria.

.DAYS TWO THROUGH SEVEN...Tuesday through Sunday...

.Fire Weather...
Fire weather conditions will become elevated Saturday afternoon
over western Oklahoma and adjacent parts of northern Texas.

Get graphics and more details at weather.gov/norman...and follow
our weather forecast office on Twitter and Facebook.

In the hours before

Local storm report, Sep 7, 7:03 PM CDT, 59 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
703 PM CDT TUE SEP 7 2021

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

0655 PM     TSTM WND GST     1 W FAIRVIEW            36.27N 98.49W
09/07/2021  M61 MPH          MAJOR              OK   MESONET

&&

BTHOREN

Local storm report, Sep 7, 7:11 PM CDT, 51 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
711 PM CDT TUE SEP 7 2021

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

0656 PM     NON-TSTM WND GST 2 W FAIRVIEW            36.27N 98.51W
09/07/2021  E80 MPH          MAJOR              OK   BROADCAST MEDIA

            WEST OF FAIRVIEW ON HWY 60 BETWEEN COUNTY ROADS 530/520

&&

BTHOREN

Special weather statement, Sep 7, 7:15 PM CDT, 47 minutes before

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

OKZ009-014-080045-
Roger Mills OK-Ellis OK-
715 PM CDT Tue Sep 7 2021

...A strong thunderstorm will impact portions of southwestern Ellis
and northwestern Roger Mills Counties through 745 PM CDT...

At 715 PM CDT, Doppler radar was tracking a strong thunderstorm 5
miles north of Durham, moving 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...
Durham.

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 3597 10000 3598 9984 3570 9978 3570 10000
TIME...MOT...LOC 0015Z 359DEG 13KT 3591 9995

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

30

Local storm report, Sep 7, 7:31 PM CDT, 31 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
731 PM CDT TUE SEP 7 2021

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

0658 PM     TSTM WND DMG     4 W FAIRVIEW            36.27N 98.55W
09/07/2021                   MAJOR              OK   BROADCAST MEDIA

            DAMAGE TO BARN AND POWER LINES DOWN.

&&

BTHOREN

Local storm report, Sep 7, 7:40 PM CDT, 22 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
740 PM CDT TUE SEP 7 2021

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

0730 PM     TSTM WND GST     LONGDALE                36.13N 98.55W
09/07/2021  E70 MPH          BLAINE             OK   BROADCAST MEDIA

&&

BTHOREN

Special weather statement, Sep 7, 7:43 PM CDT, 19 minutes before

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

OKZ013-080115-
Noble OK-
743 PM CDT Tue Sep 7 2021

...A strong thunderstorm will impact portions of southwestern Noble
County through 815 PM CDT...

At 743 PM CDT, Doppler radar was tracking a strong thunderstorm 6
miles north of Perry, moving south at 15 mph.

HAZARD...Wind gusts up to 50 mph and penny size 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...
Perry.

This includes Interstate 35 between mile markers 184 and 198.

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 3646 9735 3646 9721 3624 9714 3624 9741
TIME...MOT...LOC 0043Z 356DEG 13KT 3639 9728

MAX HAIL SIZE...0.75 IN
MAX WIND GUST...50 MPH

30

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, 8:21 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, 12:40 AM CDT	Special Weather Statement	OUN	Cotton	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

Severe Thunderstorm Warnings in Oklahoma, 2021 Every severe thunderstorm warning 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.