Alert archive / Oklahoma / Special Weather Statements in 2021

Special Weather Statement, NWS Norman, OK

May 18, 2021Washita County, Oklahoma

NWS Norman, OK issued this special weather statement at May 18, 2021, 12:44 AM CDT for Washita County, Oklahoma. It was in force for 61 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 18, 2021, 12:44 AM CDT (05:44 UTC)
Expired
May 18, 2021, 1:45 AM CDT
In force
61 min
Issued by
NWS Norman, OK

County Washita County, OK

The radar

The Altus AFB radar (KFDR), 111 km from the middle of the area, began a volume at 05:47 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

Amarillo Airport, TX (KAMA), launched 00:00Z, 5.7 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.

Skew-T log-pSkew-T log-p diagram, Amarillo Airport, TX at 00:00Z on 2021-05-18Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1013 joules per kilogram.LCLLFCEL10008507005003002001001 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, Amarillo Airport, TX at 00:00Z on 2021-05-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 13 square meters per square second.193958Sfc1 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
1013 J/kg
Mixed-layer CIN
-13 J/kg
Mixed-layer LCL
1616 m above ground
0-6 km bulk shear
31 kt
0-1 km storm-relative helicity
13 m²/s²
0-3 km storm-relative helicity
139 m²/s²
Significant tornado parameter
0.0
Supercell composite
2.3

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 18, 12:43 AM CDT, 1 minute earlier.

Area forecast discussion, May 18, 12:43 AM CDT, 1 minute before
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Hazardous weather outlook, May 17, 10:43 PM CDT, 2 hours 1 minute before
Hazardous Weather Outlook...UPDATED
National Weather Service Norman OK
1043 PM CDT Mon May 17 2021

OKZ004>048-050>052-TXZ083>090-190345-
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-
1043 PM CDT Mon May 17 2021

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

.DAY ONE...Through Tonight...

.Thunderstorms...
A few strong to severe thunderstorms will remain possible thru
late tonight, mainly across portions of northwestern and
southwestern Oklahoma, and western north Texas. Hail up to the
size of quarters and wind gusts up 60 mph will be possible.

.Heavy Rainfall...
Localized flooding could occur across portions of southern
Oklahoma thru tonight.

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

.Thunderstorms...
Thunderstorm chances will continue thru Saturday. A few severe
thunderstorms will be possible Tuesday afternoon and evening
mainly across portions of eastern and southeastern Oklahoma. Hail
up to the size of golf balls and damaging wind gusts up to 60 mph
will be possible. Strong to severe storms will again be possible
across western Oklahoma and western north Texas Wednesday
afternoon and evening.

.Heavy Rainfall...
Areas of flooding will be possible mainly along and south of
Interstate 44 thru at least Wednesday.

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 17, 11:12 PM CDT, 1 hour 32 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE Norman OK
1112 PM CDT Mon May 17 2021

OKZ033-036-TXZ083-085-180445-
Harmon OK-Jackson OK-Wilbarger TX-Hardeman TX-
1112 PM CDT Mon May 17 2021

...SIGNIFICANT WEATHER ADVISORY FOR southeastern Harmon...
southwestern Jackson...northwestern Wilbarger and central Hardeman
Counties Until 1145 PM CDT...

AT 1109 PM CDT, the leading edge of strong and gusty thunderstorm
winds extended near Eldorado, moving east at 35 MPH.

HAZARDS INCLUDE...
Wind gusts to 50 MPH...

LAT...LON 3428 9988 3473 9988 3471 9948 3457 9932
      3426 9931
TIME...MOT...LOC 0409Z 268DEG 32KT 3443 9961

JT
Special weather statement, May 17, 11:19 PM CDT, 1 hour 25 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE Norman OK
1119 PM CDT Mon May 17 2021

OKZ035>037-180500-
Kiowa OK-Tillman OK-Jackson OK-
1119 PM CDT Mon May 17 2021

...SIGNIFICANT WEATHER ADVISORY FOR southern Kiowa...Tillman and east
central Jackson Counties Until midnight CDT...

AT 1116 PM CDT, non-thunderstorm winds of 40 to 50 mph are possible.

HAZARDS INCLUDE...
Wind gusts to 50 MPH...

LAT...LON 3464 9920 3463 9895 3459 9887 3452 9883
      3451 9883 3451 9881 3438 9873 3416 9879
      3420 9894 3421 9895 3421 9897 3422 9899
      3423 9904 3437 9919
TIME...MOT...LOC 0416Z 268DEG 32KT 3432 9888

JT
Special weather statement, May 17, 11:29 PM CDT, 1 hour 15 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE Norman OK
1129 PM CDT Mon May 17 2021

OKZ004-009-010-014>016-021-180515-
Woodward OK-Roger Mills OK-Dewey OK-Harper OK-Beckham OK-Custer OK-
Ellis OK-
1129 PM CDT Mon May 17 2021

...SIGNIFICANT WEATHER ADVISORY FOR southwestern Woodward...Roger
Mills...western Dewey...southwestern Harper...northwestern Beckham...
northwestern Custer and Ellis Counties Until 1215 AM CDT...

AT 1127 PM CDT, strong thunderstorms were along a line extending from
7 miles north of Higgins to 7 miles north of Sweetwater, moving
northeast at 50 MPH.

HAZARDS INCLUDE...
Hail up to one-half inch diameter...
Wind gusts to 50 MPH...

LAT...LON 3671 10001 3689 9950 3568 9928 3531 10000
TIME...MOT...LOC 0427Z 233DEG 45KT 3623 10004 3553 9990

JT
Special weather statement, May 18, 12:19 AM CDT, 25 minutes before
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Special weather statement, May 18, 12:21 AM CDT, 23 minutes before
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Special weather statement, May 18, 12:44 AM CDT, 0 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
May 17, 10:03 PM CDTSpecial Weather StatementOUNJackson27 min
May 17, 10:29 PM CDTSpecial Weather StatementOUNHarmon31 min
May 17, 10:42 PM CDTSevere Thunderstorm WarningOUNHarmon, Jackson33 min
May 17, 11:12 PM CDTSpecial Weather StatementOUNJackson33 min
May 17, 11:19 PM CDTSpecial Weather StatementOUNTillman41 min
May 17, 11:29 PM CDTSpecial Weather StatementOUNEllis, Harper, Roger Mills46 min
May 17, 11:43 PM CDTSevere Thunderstorm WarningOUNEllis, Woodward32 min
May 18, 12:19 AM CDTSpecial Weather StatementOUNWoodward56 min
May 18, 12:21 AM CDTSpecial Weather StatementOUNRoger Mills24 min
May 18, 1:02 AM CDTSpecial Weather StatementOUNWoodward58 min
May 18, 1:03 AM CDTSpecial Weather StatementOUNDewey57 min
May 18, 1:06 AM CDTSpecial Weather StatementOUNJefferson24 min
May 18, 1:28 AM CDTSpecial Weather StatementOUNMajor47 min
May 18, 2:00 AM CDTSpecial Weather StatementOUNComanche, Kiowa, Tillman30 min
May 18, 2:35 AM CDTSpecial Weather StatementOUNComanche, Cotton, Tillman55 min
May 18, 2:48 AM CDTSpecial Weather StatementOUNKingfisher42 min
May 18, 2:56 AM CDTSpecial Weather StatementOUNGarfield49 min
May 18, 3:36 AM CDTSpecial Weather StatementOUNKingfisher39 min
May 18, 12:03 PM CDTSpecial Weather StatementOUNNoble27 min
May 18, 4:14 PM CDTSpecial Weather StatementOUNAlfalfa31 min
May 18, 4:44 PM CDTSpecial Weather StatementOUNGarfield46 min
May 17, 7:00 PM CDTSevere Thunderstorm WarningOUNBaylor, Knox45 min
May 17, 7:11 PM CDTSpecial Weather StatementOUNWilbarger34 min
May 17, 7:22 PM CDTAreal Flood AdvisoryOUNKnox3 hr
May 17, 7:33 PM CDTSevere Thunderstorm WarningOUNBaylor, Knox42 min
May 17, 8:00 PM CDTSevere Thunderstorm WarningOUNArcher, Baylor, Wichita45 min
May 17, 8:17 PM CDTSevere Thunderstorm WarningOUNArcher, Wichita23 min
May 17, 8:19 PM CDTAreal Flood AdvisoryOUNBaylor3 hr
May 17, 8:33 PM CDTAreal Flood AdvisoryOUNArcher3 hr
May 17, 9:28 PM CDTAreal Flood AdvisoryOUNWichita3 hr

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.