Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 562, NWS Norman, OK

October 27, 202110 counties in Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at Oct 27, 2021, 12:43 AM CDT for 10 counties in Oklahoma. It was in force for 47 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, 12:43 AM CDT (05:43 UTC)
Expired: Oct 27, 2021, 1:30 AM CDT
In force: 47 min
Issued by: NWS Norman, OK
Area: Storm-based polygon
Tornado: Possible
Damage threat: Considerable
Hail: 0.75 in
Wind: 70.0 mph

Counties Cleveland County, OK, Garvin County, OK, Lincoln County, OK, Logan County, OK, McClain County, OK, Oklahoma County, OK, Payne County, OK, Pontotoc County, OK, Pottawatomie County, OK, Seminole County, OK

The radar

The Norman radar (KTLX), 27 km from the middle of the area, began a volume at 05:44 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, 5.7 hours before the alert went out and 42 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.

541 
WUUS54 KOUN 270543
SVROUN
OKC027-049-081-083-087-109-119-123-125-133-270630-
/O.NEW.KOUN.SV.W.0562.211027T0543Z-211027T0630Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Norman OK
1243 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...
  Western Seminole County in east central Oklahoma...
  Lincoln County in central Oklahoma...
  Oklahoma County in central Oklahoma...
  Cleveland County in central Oklahoma...
  Northwestern Pontotoc County in east central Oklahoma...
  Logan County in central Oklahoma...
  Payne County in central Oklahoma...
  Pottawatomie County in central Oklahoma...
  Southeastern McClain County in central Oklahoma...

* Until 130 AM CDT.

* At 1242 AM CDT, severe thunderstorms were located along a line
  extending from 4 miles southeast of Marshall to near Oklahoma City
  to 4 miles east of Antioch, moving east at 45 mph.

  HAZARD...70 mph wind gusts and penny size hail.

  SOURCE...Radar indicated.

  IMPACT...Expect considerable tree damage. Damage is likely to 
           mobile homes, roofs, and outbuildings.

* Locations impacted include...
  Eastern Oklahoma City, Norman, Edmond, Moore, Midwest City,
  Stillwater, Shawnee, Del City, Ada, Guthrie, Cushing, Seminole,
  Tecumseh, Pauls Valley, Purcell, Chandler, Choctaw, Noble, Harrah
  and Slaughterville.

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 9662 3463 9745 3561 9746 3603 9768
      3616 9767 3616 9663 3541 9663 3539 9661
      3540 9659
TIME...MOT...LOC 0542Z 270DEG 41KT 3611 9758 3562 9733 3470 9733 

TORNADO...POSSIBLE
THUNDERSTORM DAMAGE THREAT...CONSIDERABLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...0.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...70 MPH

$$

Mahale

1 follow-up statement

354 
WWUS54 KOUN 270608
SVSOUN

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

OKC027-049-081-083-087-109-119-123-125-133-270630-
/O.CON.KOUN.SV.W.0562.000000T0000Z-211027T0630Z/
Garvin OK-Seminole OK-Lincoln OK-Oklahoma OK-Cleveland OK-
Pontotoc OK-Logan OK-Payne OK-Pottawatomie OK-McClain OK-
108 AM CDT Wed Oct 27 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 130 AM CDT
FOR NORTHEASTERN GARVIN...WESTERN SEMINOLE...LINCOLN...EASTERN
OKLAHOMA...EASTERN CLEVELAND...NORTHWESTERN PONTOTOC...EASTERN
LOGAN...PAYNE...POTTAWATOMIE AND SOUTHEASTERN MCCLAIN COUNTIES...

At 108 AM CDT, severe thunderstorms were located along a line
extending from near Lake Mcmurtry to 5 miles south of Wellston to 5
miles east of Wynnewood, moving east at 40 mph.

HAZARD...70 mph wind gusts.

SOURCE...Radar indicated.

IMPACT...Expect considerable tree damage. Damage is likely to mobile 
         homes, roofs, and outbuildings.

Locations impacted include...
Southeastern Oklahoma City, eastern Norman, Stillwater, Shawnee, Ada,
Cushing, Seminole, Tecumseh, Pauls Valley, Chandler, Harrah, McLoud,
Perkins, Stroud, Prague, Wynnewood, Pink, Langston, Stratford and
Konawa.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Remain alert for a possible tornado! Tornadoes can develop quickly
from severe thunderstorms.

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

&&

LAT...LON 3464 9662 3464 9722 3576 9720 3616 9739
      3616 9663 3541 9663 3539 9661 3539 9659
TIME...MOT...LOC 0608Z 270DEG 36KT 3615 9718 3561 9704 3466 9707 

TORNADO...POSSIBLE
THUNDERSTORM DAMAGE THREAT...CONSIDERABLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...70 MPH

$$

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, 1:27 AM CDT	Severe Thunderstorm Warning	OUN	Coal, Garvin, Hughes, Lincoln, McClain, Payne and 3 more	27 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.