Alert archive / Oklahoma / Special Weather Statements in 2021

Special Weather Statement, NWS Norman, OK

April 23, 2021Cotton County, Oklahoma

NWS Norman, OK issued this special weather statement at Apr 23, 2021, 1:21 PM CDT for Cotton County, Oklahoma. It was in force for 24 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
Apr 23, 2021, 1:21 PM CDT (18:21 UTC)
Expired
Apr 23, 2021, 1:45 PM CDT
In force
24 min
Issued by
NWS Norman, OK

County Cotton County, OK

The radar

The Altus AFB radar (KFDR), 66 km from the middle of the area, began a volume at 18:23 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

Norman, OK (KOUN), launched 12:00Z, 6.4 hours before the alert went out and 153 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, Norman, OK at 12:00Z on 2021-04-23Temperature 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, Norman, OK at 12:00Z on 2021-04-23The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 284 square meters per square second.1939587897117Sfc1 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
751 m above ground
0-6 km bulk shear
53 kt
0-1 km storm-relative helicity
284 m²/s²
0-3 km storm-relative helicity
202 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

984 
WWUS84 KOUN 231821
SPSOUN

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE Norman OK
121 PM CDT Fri Apr 23 2021
 
OKZ039-044-045-TXZ086-090-231845-
Cotton OK-Stephens OK-Jefferson OK-Clay TX-Wichita TX-
121 PM CDT Fri Apr 23 2021

...SIGNIFICANT WEATHER ADVISORY FOR southeastern Cotton...
southwestern Stephens...northwestern Jefferson...northwestern Clay
and northeastern Wichita Counties Until 145 PM CDT...

AT 119 PM CDT, a strong thunderstorm was located near Sheppard AFB,
moving northeast at 45 MPH.

HAZARDS INCLUDE...
Hail up to the size of nickels... 
Wind gusts to 50 MPH...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3388 9845 3405 9867 3445 9828 3414 9785
TIME...MOT...LOC 1819Z 233DEG 38KT 3402 9847 

$$

TL

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 23, 1:23 PM CDTSpecial Weather StatementOUNComanche37 min
Apr 23, 1:45 PM CDTSpecial Weather StatementOUNStephens30 min
Apr 23, 1:49 PM CDTSpecial Weather StatementOUNGrady26 min
Apr 23, 2:18 PM CDTSpecial Weather StatementOUNMcClain27 min
Apr 23, 2:44 PM CDTSpecial Weather StatementOUNJefferson31 min
Apr 23, 2:46 PM CDTSpecial Weather StatementOUNMcClain29 min
Apr 23, 3:05 PM CDTSevere Thunderstorm WarningOUNCarter, Garvin, Jefferson, Murray, Stephens40 min
Apr 23, 3:21 PM CDTSpecial Weather StatementOUNLove24 min
Apr 23, 3:47 PM CDTSpecial Weather StatementOUNGarvin, McClain28 min
Apr 23, 3:47 PM CDTSpecial Weather StatementOUNBlaine28 min
Apr 23, 3:50 PM CDTSpecial Weather StatementOUNMarshall25 min
Apr 23, 4:18 PM CDTSpecial Weather StatementOUNLove27 min
Apr 23, 4:30 PM CDTSevere Thunderstorm WarningOUNCarter, Johnston, Love, Marshall45 min
Apr 23, 4:32 PM CDTSpecial Weather StatementOUNKingfisher28 min
Apr 23, 4:33 PM CDTSpecial Weather StatementOUNOklahoma27 min
Apr 23, 4:42 PM CDTSevere Thunderstorm WarningOUNCanadian, Grady, Oklahoma33 min
Apr 23, 5:03 PM CDTSpecial Weather StatementOUNNoble27 min
Apr 23, 5:14 PM CDTSpecial Weather StatementOUNLogan31 min
Apr 23, 5:59 PM CDTSpecial Weather StatementOUNGarfield31 min
Apr 23, 6:13 PM CDTSevere Thunderstorm WarningOUNAlfalfa, Garfield, Grant47 min
Apr 23, 6:18 PM CDTSpecial Weather StatementOUNGarfield27 min
Apr 23, 6:30 PM CDTSevere Thunderstorm WarningOUNComanche, Cotton, Kiowa, Tillman45 min
Apr 23, 6:32 PM CDTSpecial Weather StatementOUNHarmon28 min
Apr 23, 6:58 PM CDTSpecial Weather StatementOUNGrant32 min
Apr 23, 1:58 PM CDTSpecial Weather StatementOUNClay47 min
Apr 23, 4:44 PM CDTSevere Thunderstorm WarningOUNFoard, Hardeman46 min
Apr 23, 4:52 PM CDTSpecial Weather StatementOUNFoard38 min
Apr 23, 5:17 PM CDTSevere Thunderstorm WarningOUNFoard, Knox43 min
Apr 23, 5:23 PM CDTSevere Thunderstorm WarningOUNBaylor, Knox52 min
Apr 23, 5:28 PM CDTSevere Thunderstorm WarningOUNFoard, Hardeman47 min
Apr 23, 5:40 PM CDTTornado WarningOUNFoard, Hardeman39 min
Apr 23, 5:52 PM CDTSevere Thunderstorm WarningOUNBaylor, Foard, Wilbarger38 min
Apr 23, 5:59 PM CDTTornado Warning Tornado observedOUNFoard, Hardeman, Wilbarger46 min
Apr 23, 6:08 PM CDTSevere Thunderstorm WarningOUNArcher, Baylor, Wichita52 min
Apr 23, 6:18 PM CDTTornado Warning Tornado observedConsiderable damage threatOUNFoard, Hardeman, Wilbarger42 min
Apr 23, 6:43 PM CDTTornado Warning Tornado observedOUNWilbarger32 min
Apr 23, 6:57 PM CDTSevere Thunderstorm WarningOUNArcher, Wichita19 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.