Alert archive / Oklahoma / Tornado Warnings in 2021

Tornado Warning 29, NWS Norman, OK

October 10, 2021Lincoln County, Pottawatomie County, Seminole County, Oklahoma

NWS Norman, OK issued this tornado warning at Oct 10, 2021, 8:56 PM CDT for Lincoln County, Pottawatomie County, Seminole County, Oklahoma. It was in force for 34 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, 8:56 PM CDT (01:56 UTC)
Expired: Oct 10, 2021, 9:30 PM CDT
In force: 34 min
Issued by: NWS Norman, OK
Area: Storm-based polygon
Tornado: Observed
Hail: 0.75 in

Counties Lincoln County, OK, Pottawatomie County, OK, Seminole County, OK

The radar

The Norman radar (KTLX), 46 km from the middle of the area, began a volume at 01:55 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.

Issued	Product	Office	Lasted
Oct 10, 3:22 PM CDT	Tornado Watch	SPC	7 hr

The nearest sounding before it

Norman, OK (KOUN), launched 00:00Z, 1.9 hours before the alert went out and 61 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 1436 J/kg
Mixed-layer CIN: -35 J/kg
Mixed-layer LCL: 1199 m above ground
0-6 km bulk shear: 71 kt
0-1 km storm-relative helicity: 187 m²/s²
0-3 km storm-relative helicity: 255 m²/s²
Significant tornado parameter: 1.9
Supercell composite: 8.8

Open this sounding in Storm Lab

The text

As transmitted.

904 
WFUS54 KOUN 110156
TOROUN
OKC081-125-133-110230-
/O.NEW.KOUN.TO.W.0029.211011T0156Z-211011T0230Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Norman OK
856 PM CDT Sun Oct 10 2021

The National Weather Service in Norman has issued a

* Tornado Warning for...
  Northwestern Seminole County in east central Oklahoma...
  Southeastern Lincoln County in central Oklahoma...
  Northeastern Pottawatomie County in central Oklahoma...

* Until 930 PM CDT.
    
* At 856 PM CDT, a tornado producing storm was located near Johnson, 
  moving northeast at 20 mph.

  HAZARD...Damaging tornado.

  SOURCE...Radar confirmed tornado.

  IMPACT...Flying debris will be dangerous to those caught without 
           shelter. Mobile homes will be damaged or destroyed. 
           Damage to roofs, windows, and vehicles will occur.  Tree 
           damage is likely.

* Locations impacted include...
  Prague, Johnson and Centerview. 

This includes Interstate 40 between mile markers 188 and 193.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

To repeat, a tornado is on the ground. TAKE COVER NOW! Move to a
storm shelter, safe room or an interior room on the lowest floor of a
sturdy building. Avoid windows. If you are outdoors, in a mobile
home, or in a vehicle, move to the closest substantial shelter and
protect yourself from flying debris.

&&

LAT...LON 3537 9688 3542 9691 3561 9663 3541 9662
TIME...MOT...LOC 0156Z 239DEG 18KT 3540 9685 

TORNADO...OBSERVED
MAX HAIL SIZE...<.75 IN

$$

..speg.

2 follow-up statements

145 
WWUS54 KOUN 110220
SVSOUN

Severe Weather Statement
National Weather Service Norman OK
920 PM CDT Sun Oct 10 2021

OKC125-133-110228-
/O.CAN.KOUN.TO.W.0029.000000T0000Z-211011T0230Z/
Seminole OK-Pottawatomie OK-
920 PM CDT Sun Oct 10 2021

...THE TORNADO WARNING FOR NORTHWESTERN SEMINOLE AND NORTHEASTERN
POTTAWATOMIE COUNTIES IS CANCELLED...
    
The tornadic thunderstorm which prompted the warning has moved into 
Lincoln County. Therefore, the Tornado Warning has been cancelled 
for Seminole and Pottawatomie Counties. However, a Severe 
Thunderstorm Warning remains in effect.

LAT...LON 3546 9672 3552 9673 3561 9663 3548 9662
TIME...MOT...LOC 0218Z 229DEG 30KT 3551 9669 

$$

OKC081-110230-
/O.CON.KOUN.TO.W.0029.000000T0000Z-211011T0230Z/
Lincoln OK-
920 PM CDT Sun Oct 10 2021

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 930 PM CDT FOR
SOUTHEASTERN LINCOLN COUNTY...
    
At 918 PM CDT, a severe thunderstorm capable of producing a tornado
was located near Prague, moving northeast at 35 mph.

HAZARD...Tornado.

SOURCE...Radar indicated rotation.

IMPACT...Flying debris will be dangerous to those caught without 
         shelter. Mobile homes will be damaged or destroyed. Damage 
         to roofs, windows, and vehicles will occur.  Tree damage is 
         likely.

Locations impacted include...
Prague.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW! Move to a storm shelter, safe room, or an interior
room on the lowest floor of a sturdy building. Avoid windows. If you
are outdoors, in a mobile home, or in a vehicle, move to the closest
substantial shelter and protect yourself from flying debris.

&&

LAT...LON 3546 9672 3552 9673 3561 9663 3548 9662
TIME...MOT...LOC 0218Z 229DEG 30KT 3551 9669 

TORNADO...RADAR INDICATED
MAX HAIL SIZE...<.75 IN

$$

..speg.

483 
WWUS54 KOUN 110224
SVSOUN

Severe Weather Statement
National Weather Service Norman OK
924 PM CDT Sun Oct 10 2021

OKC081-110233-
/O.EXP.KOUN.TO.W.0029.000000T0000Z-211011T0230Z/
Lincoln OK-
924 PM CDT Sun Oct 10 2021

...THE TORNADO WARNING FOR SOUTHEASTERN LINCOLN COUNTY WILL EXPIRE AT
930 PM CDT...
                
The rotation which prompted the Tornado Warning has weakened, and no 
longer appears capable of producing a tornado. Therefore, the 
Tornado Warning will be allowed to expire. However a Severe 
Thunderstorm Warning remains in effect.

LAT...LON 3546 9672 3552 9673 3561 9663 3548 9662
TIME...MOT...LOC 0223Z 239DEG 18KT 3552 9668 

$$

..speg.

The office that day

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

Issued	Product	Office	Counties	Lasted
Oct 10, 7:02 PM CDT	Severe Thunderstorm Warning	OUN	Canadian, Grady	43 min
Oct 10, 7:05 PM CDT	Severe Thunderstorm Warning	OUN	Jefferson	40 min
Oct 10, 7:18 PM CDT	Severe Thunderstorm Warning	OUN	Garfield, Kingfisher, Logan, Noble, Payne	42 min
Oct 10, 7:24 PM CDT	Severe Thunderstorm Warning Considerable damage threat	OUN	Canadian, Cleveland, Grady, McClain, Oklahoma	51 min
Oct 10, 7:25 PM CDT	Flash Flood Warning	OUN	Caddo, Canadian, Cleveland, Grady, McClain, Oklahoma	107 min
Oct 10, 7:33 PM CDT	Severe Thunderstorm Warning	OUN	Carter, Cotton, Garvin, Jefferson, Stephens	42 min
Oct 10, 7:43 PM CDT	Tornado Warning	OUN	Cleveland, McClain	47 min
Oct 10, 7:47 PM CDT	Severe Thunderstorm Warning	OUN	Carter, Jefferson, Love	28 min
Oct 10, 8:14 PM CDT	Severe Thunderstorm Warning	OUN	Carter, Garvin, Jefferson, Murray, Stephens	46 min
Oct 10, 8:16 PM CDT	Severe Thunderstorm Warning Considerable damage threat	OUN	Cleveland, Lincoln, McClain, Oklahoma, Pottawatomie, Seminole	59 min
Oct 10, 8:17 PM CDT	Areal Flood Advisory	OUN	Kay, Noble	3 hr
Oct 10, 8:22 PM CDT	Tornado Warning	OUN	Lincoln, Oklahoma	23 min
Oct 10, 8:43 PM CDT	Tornado Warning	OUN	Lincoln	25 min
Oct 10, 8:53 PM CDT	Severe Thunderstorm Warning	OUN	Bryan, Carter, Johnston, Love, Marshall	52 min
Oct 10, 8:59 PM CDT	Severe Thunderstorm Warning	OUN	Carter, Coal, Garvin, Johnston, Murray, Pontotoc and 1 more	46 min
Oct 10, 9:03 PM CDT	Areal Flood Advisory	OUN	Cleveland, Lincoln, Oklahoma, Pottawatomie, Seminole	3 hr
Oct 10, 9:17 PM CDT	Severe Thunderstorm Warning	OUN	Hughes, Lincoln, Payne, Pontotoc, Pottawatomie, Seminole	43 min
Oct 10, 9:43 PM CDT	Severe Thunderstorm Warning	OUN	Atoka, Bryan, Coal, Johnston, Marshall	47 min
Oct 10, 9:45 PM CDT	Areal Flood Advisory	OUN	Cleveland, Lincoln, Logan, McClain, Oklahoma, Pottawatomie	3 hr
Oct 10, 9:45 PM CDT	Severe Thunderstorm Warning	OUN	Coal, Hughes, Pontotoc, Seminole	45 min
Oct 10, 10:20 PM CDT	Tornado Warning	OUN	Hughes	25 min
Oct 10, 10:30 PM CDT	Severe Thunderstorm Warning	OUN	Atoka, Bryan, Coal	45 min
Oct 10, 11:02 PM CDT	Special Weather Statement	OUN	Caddo	28 min
Oct 10, 11:25 PM CDT	Special Weather Statement	OUN	Grady	35 min
Oct 11, 12:14 AM CDT	Special Weather Statement	OUN	Cleveland, Logan, Oklahoma	31 min

Nearby

Tornado Warnings in Oklahoma, 2021 Every tornado warning in 2021 Tornadoes 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.