Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 563, NWS Norman, OK

October 27, 20219 counties in Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at Oct 27, 2021, 1:27 AM CDT for 9 counties in Oklahoma. It was in force for 27 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 27, 2021, 1:27 AM CDT (06:27 UTC)
Expired: Oct 27, 2021, 1:54 AM CDT
In force: 27 min
Issued by: NWS Norman, OK
Area: Storm-based polygon
Tornado: Possible
Hail: 0.75 in
Wind: 60.0 mph

Counties Coal County, OK, Garvin County, OK, Hughes County, OK, Lincoln County, OK, McClain County, OK, Payne County, OK, Pontotoc County, OK, Pottawatomie County, OK, Seminole County, OK

The radar

The Norman radar (KTLX), 61 km from the middle of the area, began a volume at 06:30 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 26, 10:26 PM CDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Norman, OK (KOUN), launched 00:00Z, 6.5 hours before the alert went out and 74 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: 791 J/kg
Mixed-layer CIN: -225 J/kg
Mixed-layer LCL: 916 m above ground
0-6 km bulk shear: 39 kt
0-1 km storm-relative helicity: 277 m²/s²
0-3 km storm-relative helicity: 380 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 2.5

Open this sounding in Storm Lab

The text

As transmitted.

044 
WUUS54 KOUN 270627
SVROUN
OKC029-049-063-081-087-119-123-125-133-270730-
/O.NEW.KOUN.SV.W.0563.211027T0627Z-211027T0730Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Norman OK
127 AM CDT Wed Oct 27 2021

The National Weather Service in Norman has issued a

* Severe Thunderstorm Warning for...
  Northeastern Garvin County in southern Oklahoma...
  Northwestern Coal County in southeastern Oklahoma...
  Seminole County in east central Oklahoma...
  Lincoln County in central Oklahoma...
  Pontotoc County in east central Oklahoma...
  Payne County in central Oklahoma...
  Pottawatomie County in central Oklahoma...
  Western Hughes County in southeastern Oklahoma...
  Southeastern McClain County in central Oklahoma...

* Until 230 AM CDT.

* At 127 AM CDT, severe thunderstorms were located along a line
  extending from 3 miles southeast of Stillwater to 5 miles west of
  Sparks to 6 miles southwest of Vanoss, moving east at 30 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

  IMPACT...Expect damage to roofs, siding, and trees.

* Locations impacted include...
  Stillwater, Shawnee, Ada, Cushing, Seminole, Tecumseh, Holdenville,
  Chandler, McLoud, Wewoka, Perkins, Stroud, Prague, Stratford,
  Konawa, Yale, Byng, Meeker, Maud and Allen.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Remain alert for a possible tornado! Tornadoes can develop quickly
from severe thunderstorms. If you spot a tornado go at once into the
basement or small central room in a sturdy structure.

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

&&

LAT...LON 3464 9631 3464 9709 3562 9707 3616 9719
      3616 9663 3540 9662 3539 9654 3544 9657
      3545 9655 3543 9649 3546 9648 3545 9644
      3529 9644 3529 9632
TIME...MOT...LOC 0627Z 272DEG 26KT 3610 9702 3563 9692 3469 9693 

TORNADO...POSSIBLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

Mahale

1 follow-up statement

280 
WWUS54 KOUN 270654
SVSOUN

Severe Weather Statement
National Weather Service Norman OK
154 AM CDT Wed Oct 27 2021

OKC029-049-063-081-087-119-123-125-133-270703-
/O.CAN.KOUN.SV.W.0563.000000T0000Z-211027T0730Z/
Garvin OK-Coal OK-Seminole OK-Lincoln OK-Pontotoc OK-Payne OK-
Pottawatomie OK-Hughes OK-McClain OK-
154 AM CDT Wed Oct 27 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN GARVIN...
NORTHWESTERN COAL...SEMINOLE...LINCOLN...PONTOTOC...PAYNE...
POTTAWATOMIE...WESTERN HUGHES AND SOUTHEASTERN MCCLAIN COUNTIES IS
CANCELLED...
             
The storms which prompted the warning have weakened below severe
limits, therefore the warning has been cancelled.  However gusty
winds are still possible with these thunderstorms.

LAT...LON 3464 9631 3464 9709 3562 9707 3616 9719
      3616 9663 3540 9662 3539 9654 3544 9657
      3545 9655 3543 9649 3546 9648 3545 9644
      3529 9644 3529 9632
TIME...MOT...LOC 0653Z 272DEG 26KT 3609 9678 3562 9669 3468 9670 

$$

Mahale

The office that day

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

Issued	Product	Office	Counties	Lasted
Oct 26, 7:01 PM CDT	Severe Thunderstorm Warning	OUN	Ellis, Harper, Woods, Woodward	18 min
Oct 26, 7:06 PM CDT	Severe Thunderstorm Warning	OUN	Beckham, Roger Mills	39 min
Oct 26, 7:22 PM CDT	Special Weather Statement	OUN	Ellis	38 min
Oct 26, 7:42 PM CDT	Severe Thunderstorm Warning	OUN	Beckham, Roger Mills	48 min
Oct 26, 7:55 PM CDT	Tornado Warning	OUN	Beckham, Roger Mills	35 min
Oct 26, 7:57 PM CDT	Special Weather Statement	OUN	Woodward	33 min
Oct 26, 8:05 PM CDT	Severe Thunderstorm Warning	OUN	Dewey, Ellis, Roger Mills, Woodward	40 min
Oct 26, 8:07 PM CDT	Severe Thunderstorm Warning	OUN	Harper, Woods, Woodward	38 min
Oct 26, 8:10 PM CDT	Severe Thunderstorm Warning	OUN	Harper, Woods	16 min
Oct 26, 8:41 PM CDT	Severe Thunderstorm Warning Considerable damage threat	OUN	Custer, Dewey, Ellis, Harper, Major, Roger Mills and 2 more	49 min
Oct 26, 9:10 PM CDT	Severe Thunderstorm Warning Destructive damage threat	OUN	Jackson, Tillman	65 min
Oct 26, 9:22 PM CDT	Severe Thunderstorm Warning Considerable damage threat	OUN	Harmon, Jackson, Tillman	38 min
Oct 26, 9:31 PM CDT	Severe Thunderstorm Warning Considerable damage threat	OUN	Alfalfa, Dewey, Major, Woods, Woodward	44 min
Oct 26, 9:59 PM CDT	Severe Thunderstorm Warning Considerable damage threat	OUN	Comanche, Greer, Jackson, Kiowa, Tillman	46 min
Oct 26, 10:11 PM CDT	Severe Thunderstorm Warning	OUN	Alfalfa, Major, Woods	22 min
Oct 26, 10:12 PM CDT	Severe Thunderstorm Warning	OUN	Comanche, Cotton, Tillman	33 min
Oct 26, 10:38 PM CDT	Special Weather Statement	OUN	Woods	37 min
Oct 26, 10:42 PM CDT	Severe Thunderstorm Warning	OUN	Caddo, Comanche, Cotton, Kiowa, Tillman, Washita	63 min
Oct 26, 10:43 PM CDT	Severe Thunderstorm Warning	OUN	Alfalfa, Woods	35 min
Oct 26, 11:08 PM CDT	Special Weather Statement	OUN	Alfalfa	37 min
Oct 26, 11:22 PM CDT	Severe Thunderstorm Warning Considerable damage threat	OUN	Caddo, Canadian, Comanche, Garvin, Grady, McClain and 1 more	38 min
Oct 26, 11:36 PM CDT	Special Weather Statement	OUN	Blaine, Kingfisher	24 min
Oct 26, 11:52 PM CDT	Severe Thunderstorm Warning Considerable damage threat	OUN	Blaine, Canadian, Cleveland, Garvin, Grady, Kingfisher and 3 more	53 min
Oct 26, 11:53 PM CDT	Severe Thunderstorm Warning	OUN	Alfalfa, Garfield, Grant, Major	52 min
Oct 27, 12:11 AM CDT	Special Weather Statement	OUN	Garfield	34 min
Oct 27, 12:36 AM CDT	Tornado Warning	OUN	Cleveland, Lincoln, Oklahoma, Pottawatomie	24 min
Oct 27, 12:43 AM CDT	Severe Thunderstorm Warning Considerable damage threat	OUN	Cleveland, Garvin, Lincoln, Logan, McClain, Oklahoma and 4 more	47 min
Oct 27, 2:28 AM CDT	Wind Advisory	OUN	Beckham, Custer, Dewey, Ellis, Greer, Harmon and 7 more	17 hr
Oct 27, 1:38 PM CDT	Wind Advisory	OUN	Alfalfa, Atoka, Beckham, Blaine, Bryan, Caddo and 42 more	31 hr

Nearby

Severe Thunderstorm Warnings in Oklahoma, 2021 Every 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.