Alert archive / Oklahoma / Special Weather Statements in 2021

Special Weather Statement, NWS Norman, OK

May 10, 2021Jefferson County, Oklahoma

NWS Norman, OK issued this special weather statement at May 10, 2021, 9:13 AM CDT for Jefferson County, Oklahoma. It was in force for 47 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
May 10, 2021, 9:13 AM CDT (14:13 UTC)
Expired
May 10, 2021, 10:00 AM CDT
In force
47 min
Issued by
NWS Norman, OK

County Jefferson County, OK

The radar

The Altus AFB radar (KFDR), 129 km from the middle of the area, began a volume at 14:13 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

Fort Worth, TX (KFWD), launched 12:00Z, 2.2 hours before the alert went out and 129 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-pSkew-T log-p diagram, Fort Worth, TX at 12:00Z on 2021-05-10Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Fort Worth, TX at 12:00Z on 2021-05-10The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 299 square meters per square second.1939587897Sfc1 km3 km6 km9 kmRMLM
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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
675 m above ground
0-6 km bulk shear
50 kt
0-1 km storm-relative helicity
299 m²/s²
0-3 km storm-relative helicity
381 m²/s²
Significant tornado parameter
0.0
Supercell composite
4.2

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 May 10, 5:46 AM CDT, 3 hours 27 minutes earlier.

Area forecast discussion, May 10, 5:46 AM CDT, 3 hours 27 minutes before
Area Forecast Discussion
National Weather Service Norman OK
546 AM CDT Mon May 10 2021

...New AVIATION, UPPER AIR...

.SHORT TERM...
(Today and tonight)
Issued at 219 AM CDT Mon May 10 2021

Scattered showers will continue to work east across portions of
northern Oklahoma this morning and may linger though much of the day
as minor upper level disturbance moves across Kansas. Meanwhile
further south, waa pattern develops, although models have begun to
show this pattern remaining further south across Texas than previous
runs. So will look at lowering precip chances for this afternoon,
but likely not removing entirely.

By Monday night, approaching shortwave trough will strengthen waa
across the area from west to east overnight, resulting in mainly
light precipitation developing across areas to our west and then
further east by Tuesday morning. Instability will be slow to
develop, but a few elevated thunderstorms will remain possible,
while severe weather chances remain low.

&&

.LONG TERM...
(Tuesday through Sunday)
Issued at 219 AM CDT Mon May 10 2021

Widespread cloud cover and precip will limit daytime insolation and
a rather cool day is anticipated for Tuesday. Highs Tuesday will be
some 15 to 20 degrees below seasonal norms. As trough axis moves to
the east, rain chances will diminish from west to east Tuesday night
Wednesday.

Shortwave ridging will build east out of the Rockies by the end of
the week with warmer temperatures and drier conditions. This will
however put the Plains in a northwest flow pattern and we could see
High Plains convection develop and move southeast toward the area by
Friday night into Saturday. Could see another round Saturday night
into Sunday, perhaps a bit further east as ridge begins to shift
east as western trough develops into the western conus. Model
differences keep latter part of extended with lower confidence, but
pattern would suggest a higher probability of severe weather as we
go into the following week.

&&

.AVIATION...
(12Z TAFS)
Issued at 541 AM CDT Mon May 10 2021

Showers will move through northwest and north central OK this
morning. Mostly MVFR conditions are expected at each site
throughout the period. NNE winds will prevail across the area.
Ceilings could come up to VFR in the early afternoon, but then are
expected to drop by down to MVFR this evening again. Showers
could impact each site towards the end of the period.

&&

.UPPER AIR...
Issued at 541 AM CDT Mon May 10 2021

No soundings are planned at this time.

&&

.PRELIMINARY POINT TEMPS/POPS...
Oklahoma City OK  65  50  57  49 /  10  40  70  30
Hobart OK         67  49  57  48 /  10  40  70  30
Wichita Falls TX  64  54  61  52 /  20  50  80  40
Gage OK           62  43  54  43 /  20  40  60  30
Ponca City OK     63  47  59  48 /  40  30  60  30
Durant OK         64  54  61  53 /  30  50  80  50

&&

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

SHORT TERM...30
LONG TERM....30
AVIATION...13
Hazardous weather outlook, May 10, 8:04 AM CDT, 1 hour 9 minutes before
Hazardous Weather Outlook...UPDATED
National Weather Service Norman OK
804 AM CDT Mon May 10 2021

OKZ004>048-050>052-TXZ083>090-111315-
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-
804 AM CDT Mon May 10 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...
A few thunderstorms will be possible across portions of southern
Oklahoma and western north Texas today with chances spreading
across parts of western Oklahoma late tonight. A strong to
marginally severe storm or two may occur this morning thru late this
afternoon across far southern Oklahoma. The strongest storms may
be capable of producing up to quarter size hail.

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

.Thunderstorms...
Thunderstorm chances persist Tuesday and Wednesday across parts of
the area, but severe weather appears unlikely at this time.

Thunderstorm chances return to parts of Oklahoma and western north
Texas Friday night and continue through Sunday. A few strong to
severe storms appear possible with this activity.

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, May 10, 7:30 AM CDT, 1 hour 43 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE Norman OK
730 AM CDT Mon May 10 2021

OKZ044-TXZ086-090-101315-
Cotton OK-Clay TX-Wichita TX-
730 AM CDT Mon May 10 2021

...SIGNIFICANT WEATHER ADVISORY FOR southeastern Cotton...
northwestern Clay and east central Wichita Counties Until 815 AM
CDT...

AT 729 AM CDT, a strong thunderstorm was located 4 miles west of
Sheppard AFB, moving east at 40 MPH.

HAZARDS INCLUDE...
Hail up to the size of nickels...
Wind gusts to 50 MPH...
Heavy rain can lead to reduced visibility...
Frequent cloud to ground lightning...

Locations impacted include...
Northwestern Wichita Falls, Burkburnett, Petrolia, Byers, Dean,
Sheppard AFB, Pleasant Valley, Charlie and Cashion.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3404 9868 3423 9815 3416 9814 3415 9814
      3415 9813 3408 9812 3407 9812 3406 9811
      3396 9809 3394 9865
TIME...MOT...LOC 1229Z 256DEG 36KT 3400 9858

03
Special weather statement, May 10, 8:29 AM CDT, 44 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE Norman OK
829 AM CDT Mon May 10 2021

OKZ045-046-050-TXZ090-101415-
Love OK-Carter OK-Jefferson OK-Clay TX-
829 AM CDT Mon May 10 2021

...SIGNIFICANT WEATHER ADVISORY FOR northwestern Love...southwestern
Carter...central Jefferson and northeastern Clay Counties Until 915
AM CDT...

AT 828 AM CDT, strong thunderstorms were along a line extending from
7 miles southwest of Sugden to 4 miles southeast of Ryan to 4 miles
south of Oscar, moving east at 45 MPH.

HAZARDS INCLUDE...
Hail up to the size of nickels...
Wind gusts to 50 MPH...
Heavy rain can lead to reduced visibility...
Frequent cloud to ground lightning...

Locations impacted include...
Ryan, Sugden, Grady, Rubottom, Oscar, Burneyville, Courtney and
Petersburg.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3388 9745 3390 9745 3392 9749 3390 9759
      3395 9759 3399 9767 3389 9780 3395 9814
      3409 9812 3413 9765 3406 9733 3395 9713
TIME...MOT...LOC 1328Z 262DEG 38KT 3402 9807 3397 9792 3392 9778

03
Special weather statement, May 10, 9:02 AM CDT, 11 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE Norman OK
902 AM CDT Mon May 10 2021

OKZ039-045-046-101430-
Stephens OK-Carter OK-Jefferson OK-
902 AM CDT Mon May 10 2021

...SIGNIFICANT WEATHER ADVISORY FOR southeastern Stephens...
northwestern Carter and northeastern Jefferson Counties Until 930 AM
CDT...

AT 859 AM CDT, a strong thunderstorm was located near Loco, moving
east at 45 MPH.

HAZARDS INCLUDE...
Hail up to the size of dimes...
Wind gusts to 50 MPH...
Heavy rain can lead to reduced visibility...
Frequent cloud to ground lightning...

Locations impacted include...
Healdton, Loco, Graham, Pooleville and Fox.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3434 9775 3444 9735 3424 9735 3422 9773
TIME...MOT...LOC 1359Z 261DEG 37KT 3429 9764

03
Special weather statement, May 10, 9:13 AM CDT, 0 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE Norman OK
913 AM CDT Mon May 10 2021

OKZ045-050-101500-
Love OK-Jefferson OK-
913 AM CDT Mon May 10 2021

...SIGNIFICANT WEATHER ADVISORY FOR northwestern Love and
southeastern Jefferson Counties Until 1000 AM CDT...

AT 909 AM CDT, a strong thunderstorm was located near Grady, moving
east at 30 MPH.

HAZARDS INCLUDE...
Hail up to the size of nickels...
Wind gusts to 50 MPH...
Heavy rain can lead to reduced visibility...
Frequent cloud to ground lightning...

Locations impacted include...
Grady, Oscar, Courtney and Petersburg.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3392 9785 3403 9783 3407 9756 3407 9743
      3391 9747 3392 9750 3390 9755 3390 9759
      3392 9760 3395 9759 3399 9767 3398 9770
      3394 9773 3394 9776 3391 9776 3392 9778
      3390 9778
TIME...MOT...LOC 1409Z 274DEG 25KT 3397 9767

03

The office that day

Everything else NWS Norman, OK issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 10, 7:30 AM CDTSpecial Weather StatementOUNCotton45 min
May 10, 8:29 AM CDTSpecial Weather StatementOUNJefferson, Love46 min
May 10, 8:40 AM CDTSevere Thunderstorm WarningOUNJefferson, Love50 min
May 10, 9:02 AM CDTSpecial Weather StatementOUNCarter28 min
May 10, 9:19 AM CDTSpecial Weather StatementOUNLove41 min
May 10, 9:22 AM CDTSevere Thunderstorm WarningOUNLove38 min
May 10, 9:25 AM CDTSevere Thunderstorm WarningOUNJefferson, Love35 min
May 10, 9:39 AM CDTAreal Flood AdvisoryOUNJefferson, Love3 hr
May 10, 10:10 AM CDTSpecial Weather StatementOUNLove35 min
May 10, 10:21 AM CDTSpecial Weather StatementOUNJefferson24 min
May 10, 10:30 AM CDTSpecial Weather StatementOUNCoal30 min
May 10, 10:54 AM CDTSpecial Weather StatementOUNBryan36 min
May 10, 11:18 AM CDTSpecial Weather StatementOUNCarter27 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.