Alert archive / Oklahoma / Special Weather Statements in 2021
Special Weather Statement, NWS Norman, OK
NWS Norman, OK issued this special weather statement at Aug 21, 2021, 6:10 PM CDT for Blaine 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
- Aug 21, 2021, 6:10 PM CDT (23:10 UTC)
- Expired
- Aug 21, 2021, 6:45 PM CDT
- In force
- 35 min
- Issued by
- NWS Norman, OK
- Hail
- 0.88 in
- Wind
- 50
County Blaine County, OK
The radar
The Vance AFB radar (KVNX), 76 km from the middle of the area, began a volume at 23:13 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
Dodge City, (KDDC), launched 12:00Z, 11.2 hours before the alert went out and 233 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.
- Mixed-layer CAPE
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1831 m above ground
- 0-6 km bulk shear
- 24 kt
- 0-1 km storm-relative helicity
- -38 m²/s²
- 0-3 km storm-relative helicity
- 229 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
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</html>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 21, 2:15 PM CDT, 3 hours 55 minutes earlier.
Area forecast discussion, Aug 21, 2:15 PM CDT, 3 hours 55 minutes before
Area Forecast Discussion
National Weather Service Norman OK
215 PM CDT Sat Aug 21 2021
...New LONG TERM...
.SHORT TERM...
(This evening through Sunday)
Issued at 108 PM CDT Sat Aug 21 2021
Current surface analysis shows a cold front sneaking into NW OK,
with an outflow boundary extending W/E near the I-40 corridor and
then slightly NE to near SWO. Another outflow boundary extended
N/S from SWO due southward. Visible satellite is slowly starting
to indicate cumulus developing along these boundaries. In
addition, differential heating is occuring south of Enid to near
Guthrie and Stillwater, with a plume of low level moisture still
residing over north central OK. All these areas will be focus for
moist convection later this afternoon into this evening,
especially over western/NW OK as a subtle perturbation lifts out
of west TX. Given precip loading and expected downdraft CAPE
(especially over NW OK within drier subcloud layer) would expect
some severe gusts thru tonight. Most of the precip should
dissipate a couple hours after sunset, but some elevated showers
could persist into the overnight across northern OK.
The main concern Sunday will be the heat. Still expect heat index
values to exceed 105 for many locations along and east of I-35.
Extreme values of WBGT will also cover a more widespread area as
compared to today, even with the wind speeds increasing a bit
from the south. Therefore, have decided to go ahead with another
heat advisory for tomorrow afternoon.
&&
.LONG TERM...
(Sunday night through next Friday)
Issued at 209 PM CDT Sat Aug 21 2021
During the long term, the upper flow and changing weather including
a tropical system, will stay across much of the northern half of the
U.S. A persisting upper high across most of the southern half of the
country will maintain a slightly warmer than seasonable pattern
keeping the Southern Plains hot and humid as well as POP free
through next week. Although model trends have been underestimating
afternoon dew points perhaps due to mixing biases, the excessive
heat will be the main concern with triple digit heat indices. Could
see heat advisories for a couple of days, mainly across the central
and southeast portions of our Oklahoma area.
At the end of this forecast period, an upper trough digging into the
Central Plains may start to break our upper high pattern. With the
possibility of a surface boundary also pushing into the Central
Plains, could see some storm POPs mainly on Saturday afternoon
across northern Oklahoma, while a weak upper low across the
Mississippi Delta Region could also brush additional elevated storm
POPs into southeast Oklahoma as well.
&&
.AVIATION...
(18Z TAFS)
Issued at 108 PM CDT Sat Aug 21 2021
Main aviation concern thru tonight will be developing tstorms,
mainly near and north of I-40. Currently expect them to initially
develop after 21Z south of WWR and near SWO, and then become a
bit more widespread into the evening over central OK. For now,
will only include tempo for TSRA at CSM and SWO where confidence
is high enough to warrant it. Otherwise, PROB30 were continued.
Expect some strong wind gusts under any stronger storms.
&&
.UPPER AIR...
Issued at 108 PM CDT Sat Aug 21 2021
An Upper Air flight is not planned for today.
&&
.PRELIMINARY POINT TEMPS/POPS...
Oklahoma City OK 74 95 74 96 / 30 0 0 0
Hobart OK 73 97 72 99 / 30 0 0 0
Wichita Falls TX 76 98 74 99 / 0 0 0 0
Gage OK 70 95 72 98 / 40 0 0 0
Ponca City OK 72 96 74 100 / 20 10 0 0
Durant OK 75 97 73 98 / 0 0 0 0
&&
.OUN WATCHES/WARNINGS/ADVISORIES...
OK...Heat Advisory until 8 PM CDT this evening for OKZ018>020-024>032-
039>043-045>048-050>052.
Heat Advisory from noon to 8 PM CDT Sunday for OKZ007-008-012-
013-018>020-024>032-039>043-045>048-050>052.
TX...None.
&&
SHORT TERM...03
LONG TERM....68
AVIATION...03Hazardous weather outlook, Aug 21, 3:38 PM CDT, 2 hours 32 minutes before
Hazardous Weather Outlook National Weather Service Norman OK 338 PM CDT Sat Aug 21 2021 OKZ004>048-050>052-TXZ083>090-221000- 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- 338 PM CDT Sat Aug 21 2021 This hazardous weather outlook is for portions of northern... western...central...and southern Oklahoma...and western north Texas. .DAY ONE...Through Tonight... .Heat... Very hot and humid conditions will cause heat index of 105 to 110 degrees this afternoon. These conditions could cause heat related illness, particularly for those working or participating in outdoor activities. .Thunderstorms... There is a marginal risk of severe thunderstorms this afternoon and evening for northern and central Oklahoma. The main hazards will be damaging wind gusts and heavy rainfall. .DAYS TWO THROUGH SEVEN...Sunday through Friday... .Heat... Very hot and humid conditions will continue into next week. 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, Aug 21, 4:01 PM CDT, 2 hours 9 minutes before
Special Weather Statement
National Weather Service Norman OK
401 PM CDT Sat Aug 21 2021
OKZ015-212130-
Dewey OK-
401 PM CDT Sat Aug 21 2021
...A strong thunderstorm will impact portions of central Dewey County
through 430 PM CDT...
At 401 PM CDT, Doppler radar was tracking a strong thunderstorm near
Taloga, moving northeast 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...
Taloga.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
If outdoors, consider seeking shelter inside a building.
Torrential rainfall is also occurring with this storm and may lead to
localized flooding. Do not drive your vehicle through flooded
roadways.
&&
LAT...LON 3596 9902 3601 9910 3613 9904 3603 9888
TIME...MOT...LOC 2101Z 221DEG 11KT 3602 9902
MAX HAIL SIZE...0.50 IN
MAX WIND GUST...50 MPH
JPLocal storm report, Aug 21, 4:15 PM CDT, 1 hour 55 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
415 PM CDT SAT AUG 21 2021
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0400 PM HAIL 7 SE HARMON 36.07N 99.47W
08/21/2021 E1.75 INCH ELLIS OK BROADCAST MEDIA
ON COUNTY ROAD NS 1950.
&&
EMSpecial weather statement, Aug 21, 5:22 PM CDT, 48 minutes before
Special Weather Statement
National Weather Service Norman OK
522 PM CDT Sat Aug 21 2021
OKZ018-212245-
Kingfisher OK-
522 PM CDT Sat Aug 21 2021
...A strong thunderstorm will impact portions of northwestern
Kingfisher County through 545 PM CDT...
At 522 PM CDT, Doppler radar was tracking a strong thunderstorm 6
miles northeast of Loyal, moving northeast at 10 mph.
HAZARD...Wind gusts up to 50 mph and nickel 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...
Loyal.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
If outdoors, consider seeking shelter inside a building.
Torrential rainfall is also occurring with this storm and may lead to
localized flooding. Do not drive your vehicle through flooded
roadways.
&&
LAT...LON 3592 9801 3596 9812 3611 9808 3603 9787
TIME...MOT...LOC 2222Z 210DEG 9KT 3602 9802
MAX HAIL SIZE...0.88 IN
MAX WIND GUST...50 MPH
JPSpecial weather statement, Aug 21, 5:31 PM CDT, 39 minutes before
Special Weather Statement
National Weather Service Norman OK
531 PM CDT Sat Aug 21 2021
OKZ009-014-212300-
Roger Mills OK-Ellis OK-
531 PM CDT Sat Aug 21 2021
...A strong thunderstorm will impact portions of south central Ellis
and northeastern Roger Mills Counties through 600 PM CDT...
At 531 PM CDT, Doppler radar was tracking a strong thunderstorm 5
miles northeast of Roll, moving northeast 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.
This storm will remain over mainly rural areas of south central Ellis
and northeastern Roger Mills Counties.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
If outdoors, consider seeking shelter inside a building.
Torrential rainfall is also occurring with this storm and may lead to
localized flooding. Do not drive your vehicle through flooded
roadways.
&&
LAT...LON 3578 9964 3586 9979 3601 9971 3588 9947
TIME...MOT...LOC 2231Z 214DEG 14KT 3586 9966
MAX HAIL SIZE...0.75 IN
MAX WIND GUST...50 MPH
JPSpecial weather statement, Aug 21, 6:03 PM CDT, 7 minutes before
Special Weather Statement
National Weather Service Norman OK
603 PM CDT Sat Aug 21 2021
OKZ015-016-212330-
Dewey OK-Custer OK-
603 PM CDT Sat Aug 21 2021
...A strong thunderstorm will impact portions of northeastern Custer
and south central Dewey Counties through 630 PM CDT...
At 603 PM CDT, Doppler radar was tracking a strong thunderstorm 4
miles west of Thomas, moving north at 15 mph.
HAZARD...Wind gusts up to 50 mph and nickel 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...
Thomas.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
If outdoors, consider seeking shelter inside a building.
Torrential rainfall is also occurring with this storm and may lead to
localized flooding. Do not drive your vehicle through flooded
roadways.
&&
LAT...LON 3568 9880 3571 9891 3587 9891 3581 9866
TIME...MOT...LOC 2303Z 200DEG 12KT 3575 9883
MAX HAIL SIZE...0.88 IN
MAX WIND GUST...50 MPH
JPSpecial weather statement, Aug 21, 6:10 PM CDT, 0 minutes before
Special Weather Statement
National Weather Service Norman OK
610 PM CDT Sat Aug 21 2021
OKZ011-017-018-212345-
Major OK-Kingfisher OK-Blaine OK-
610 PM CDT Sat Aug 21 2021
...A strong thunderstorm will impact portions of northwestern
Kingfisher, northern Blaine and southeastern Major Counties through
645 PM CDT...
At 610 PM CDT, Doppler radar was tracking a strong thunderstorm near
Okeene, moving north at 15 mph.
HAZARD...Wind gusts up to 50 mph and nickel 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...
Fairview, Okeene, Hitchcock, Isabella, Southard and Homestead.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
If outdoors, consider seeking shelter inside a building.
Torrential rainfall is also occurring with this storm and may lead to
localized flooding. Do not drive your vehicle through flooded
roadways.
&&
LAT...LON 3594 9827 3605 9856 3629 9847 3619 9815
TIME...MOT...LOC 2310Z 200DEG 12KT 3617 9834
MAX HAIL SIZE...0.88 IN
MAX WIND GUST...50 MPH
JPThe office that day
Everything else NWS Norman, OK issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 21, 1:00 AM CDT | Special Weather Statement | OUN | Grant | 30 min |
| Aug 21, 2:36 AM CDT | Heat Advisory | OUN | Atoka, Bryan, Canadian, Carter, Cleveland, Coal and 18 more | 17 hr |
| Aug 21, 1:38 PM CDT | Heat Advisory | OUN | Atoka, Bryan, Canadian, Carter, Cleveland, Coal and 22 more | 30 hr |
| Aug 21, 3:32 PM CDT | Special Weather Statement | OUN | Jackson | 28 min |
| Aug 21, 3:40 PM CDT | Special Weather Statement | OUN | Ellis | 35 min |
| Aug 21, 3:52 PM CDT | Severe Thunderstorm Warning | OUN | Ellis | 38 min |
| Aug 21, 4:01 PM CDT | Special Weather Statement | OUN | Dewey | 29 min |
| Aug 21, 4:11 PM CDT | Severe Thunderstorm Warning | OUN | Dewey | 49 min |
| Aug 21, 4:32 PM CDT | Severe Thunderstorm Warning | OUN | Ellis, Woodward | 43 min |
| Aug 21, 5:05 PM CDT | Severe Thunderstorm Warning | OUN | Dewey, Major, Woodward | 40 min |
| Aug 21, 5:19 PM CDT | Severe Thunderstorm Warning | OUN | Blaine, Dewey | 41 min |
| Aug 21, 5:22 PM CDT | Special Weather Statement | OUN | Kingfisher | 23 min |
| Aug 21, 5:29 PM CDT | Severe Thunderstorm Warning | OUN | Kingfisher | 46 min |
| Aug 21, 5:31 PM CDT | Special Weather Statement | OUN | Roger Mills | 29 min |
| Aug 21, 5:35 PM CDT | Areal Flood Advisory | OUN | Dewey | 3 hr |
| Aug 21, 5:43 PM CDT | Severe Thunderstorm Warning | OUN | Dewey, Major, Woodward | 47 min |
| Aug 21, 6:03 PM CDT | Special Weather Statement | OUN | Custer | 27 min |
| Aug 21, 6:14 PM CDT | Special Weather Statement | OUN | Dewey | 31 min |
| Aug 21, 6:17 PM CDT | Severe Thunderstorm Warning | OUN | Kingfisher | 23 min |
| Aug 21, 6:21 PM CDT | Severe Thunderstorm Warning | OUN | Kingfisher, Logan | 39 min |
| Aug 21, 6:25 PM CDT | Severe Thunderstorm Warning | OUN | Lincoln | 50 min |
| Aug 21, 6:33 PM CDT | Areal Flood Advisory | OUN | Dewey, Ellis, Roger Mills | 3 hr |
| Aug 21, 6:56 PM CDT | Special Weather Statement | OUN | Kingfisher | 34 min |
Nearby
Special Weather Statements in Oklahoma, 2021Every 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.