Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 511, NWS Norman, OK

October 10, 2021Clay County, Texas; Carter County, Jefferson County, Love County, Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at Oct 10, 2021, 7:47 PM CDT for Clay County, Texas; Carter County, Jefferson County, Love County, Oklahoma. It was in force for 28 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
Oct 10, 2021, 7:47 PM CDT (00:47 UTC)
Expired
Oct 10, 2021, 8:15 PM CDT
In force
28 min
Issued by
NWS Norman, OK
Area
Storm-based polygon
Hail
1.0 in
Wind
60.0 mph

Counties Carter County, OK, Jefferson County, OK, Love County, OK, Clay County, TX

The radar

The Altus AFB radar (KFDR), 123 km from the middle of the area, began a volume at 00:51 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

IssuedProductOfficeLasted
Oct 10, 3:22 PM CDTTornado WatchSPC7 hr

The nearest sounding before it

Fort Worth, TX (KFWD), launched 00:00Z, 0.8 hours before the alert went out and 125 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 00:00Z on 2021-10-11Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1814 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, Fort Worth, TX at 00:00Z on 2021-10-11The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 130 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
1814 J/kg
Mixed-layer CIN
-39 J/kg
Mixed-layer LCL
1524 m above ground
0-6 km bulk shear
52 kt
0-1 km storm-relative helicity
130 m²/s²
0-3 km storm-relative helicity
253 m²/s²
Significant tornado parameter
1.5
Supercell composite
11.2

Open this sounding in Storm Lab

The text

As transmitted.

864 
WUUS54 KOUN 110047
SVROUN
OKC019-067-085-TXC077-110115-
/O.NEW.KOUN.SV.W.0511.211011T0047Z-211011T0115Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Norman OK
747 PM CDT Sun Oct 10 2021

The National Weather Service in Norman has issued a

* Severe Thunderstorm Warning for...
  Central Jefferson County in southern Oklahoma...
  Northwestern Love County in southern Oklahoma...
  Southwestern Carter County in southern Oklahoma...
  Clay County in northern Texas...

* Until 815 PM CDT.

* At 746 PM CDT, severe thunderstorms were located along a line
  extending from near Byers to 11 miles west of Newport, moving east
  at 55 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...
  Henrietta, Wilson, Ryan, Petrolia, Byers, Terral, Bellevue, Leon,
  Sugden, Rubottom, Bluegrove, Grady, Oscar, Newport, northeastern
  Lake Arrowhead, Cornish, Shannon, Courtney, Petersburg and Joy.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Tornado Watch remains in effect for the warned area. Tornadoes can
develop quickly from severe thunderstorms.

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

&&

LAT...LON 3408 9828 3418 9739 3382 9738 3384 9746
      3389 9745 3392 9749 3390 9759 3395 9759
      3399 9767 3386 9783 3385 9787 3389 9798
      3347 9798 3347 9837
TIME...MOT...LOC 0046Z 260DEG 47KT 3410 9818 3341 9821 

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

$$

Ware

The office that day

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

IssuedProductOfficeCountiesLasted
Oct 10, 7:05 PM CDTSevere Thunderstorm WarningOUNArcher, Clay, Wichita40 min
Oct 10, 7:33 PM CDTSevere Thunderstorm WarningOUNClay42 min
Oct 10, 7:02 PM CDTSevere Thunderstorm WarningOUNCanadian, Grady43 min
Oct 10, 7:18 PM CDTSevere Thunderstorm WarningOUNGarfield, Kingfisher, Logan, Noble, Payne42 min
Oct 10, 7:24 PM CDTSevere Thunderstorm Warning Considerable damage threatOUNCanadian, Cleveland, Grady, McClain, Oklahoma51 min
Oct 10, 7:25 PM CDTFlash Flood WarningOUNCaddo, Canadian, Cleveland, Grady, McClain, Oklahoma107 min
Oct 10, 7:43 PM CDTTornado WarningOUNCleveland, McClain47 min
Oct 10, 8:14 PM CDTSevere Thunderstorm WarningOUNCarter, Garvin, Jefferson, Murray, Stephens46 min
Oct 10, 8:16 PM CDTSevere Thunderstorm Warning Considerable damage threatOUNCleveland, Lincoln, McClain, Oklahoma, Pottawatomie, Seminole59 min
Oct 10, 8:17 PM CDTAreal Flood AdvisoryOUNKay, Noble3 hr
Oct 10, 8:22 PM CDTTornado WarningOUNLincoln, Oklahoma23 min
Oct 10, 8:43 PM CDTTornado WarningOUNLincoln25 min
Oct 10, 8:53 PM CDTSevere Thunderstorm WarningOUNBryan, Carter, Johnston, Love, Marshall52 min
Oct 10, 8:56 PM CDTTornado Warning Tornado observedOUNLincoln, Pottawatomie, Seminole34 min
Oct 10, 8:59 PM CDTSevere Thunderstorm WarningOUNCarter, Coal, Garvin, Johnston, Murray, Pontotoc and 1 more46 min
Oct 10, 9:03 PM CDTAreal Flood AdvisoryOUNCleveland, Lincoln, Oklahoma, Pottawatomie, Seminole3 hr
Oct 10, 9:17 PM CDTSevere Thunderstorm WarningOUNHughes, Lincoln, Payne, Pontotoc, Pottawatomie, Seminole43 min
Oct 10, 9:43 PM CDTSevere Thunderstorm WarningOUNAtoka, Bryan, Coal, Johnston, Marshall47 min
Oct 10, 9:45 PM CDTAreal Flood AdvisoryOUNCleveland, Lincoln, Logan, McClain, Oklahoma, Pottawatomie3 hr
Oct 10, 9:45 PM CDTSevere Thunderstorm WarningOUNCoal, Hughes, Pontotoc, Seminole45 min
Oct 10, 10:20 PM CDTTornado WarningOUNHughes25 min
Oct 10, 10:30 PM CDTSevere Thunderstorm WarningOUNAtoka, Bryan, Coal45 min
Oct 10, 11:02 PM CDTSpecial Weather StatementOUNCaddo28 min
Oct 10, 11:25 PM CDTSpecial Weather StatementOUNGrady35 min
Oct 11, 12:14 AM CDTSpecial Weather StatementOUNCleveland, Logan, Oklahoma31 min

Nearby

Severe Thunderstorm Warnings in Oklahoma, 2021Severe Thunderstorm Warnings in Texas, 2021Every 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.