Alert archive / Oklahoma / Tornado Watches in 2021

Tornado Watch 215

May 27, 202172 counties in Oklahoma

The Storm Prediction Center issued this tornado watch at May 27, 2021, 11:58 AM CDT for 72 counties in Oklahoma. It was in force for 9 hr.

The area

The outline as issued.

The facts

Issued
May 27, 2021, 11:58 AM CDT (16:58 UTC)
Expired
May 27, 2021, 9:00 PM CDT
In force
9 hr
Issued by
the Storm Prediction Center
Largest hail expected
3 in
Strongest gust expected
70 kt
All 72 counties

Adair County, OK, Alfalfa County, OK, Atoka County, OK, Beckham County, OK, Blaine County, OK, Bryan County, OK, Caddo County, OK, Canadian County, OK, Carter County, OK, Cherokee County, OK, Choctaw County, OK, Cleveland County, OK, Coal County, OK, Comanche County, OK, Cotton County, OK, Craig County, OK, Creek County, OK, Custer County, OK, Delaware County, OK, Dewey County, OK, Ellis County, OK, Garfield County, OK, Garvin County, OK, Grady County, OK, Grant County, OK, Greer County, OK, Harmon County, OK, Haskell County, OK, Hughes County, OK, Jackson County, OK, Jefferson County, OK, Johnston County, OK, Kay County, OK, Kingfisher County, OK, Kiowa County, OK, Latimer County, OK, LeFlore County, OK, Lincoln County, OK, Logan County, OK, Love County, OK, Major County, OK, Marshall County, OK, Mayes County, OK, McClain County, OK, McIntosh County, OK, Murray County, OK, Muskogee County, OK, Noble County, OK, Nowata County, OK, Okfuskee County, OK, Oklahoma County, OK, Okmulgee County, OK, Osage County, OK, Ottawa County, OK, Pawnee County, OK, Payne County, OK, Pittsburg County, OK, Pontotoc County, OK, Pottawatomie County, OK, Pushmataha County, OK, Roger Mills County, OK, Rogers County, OK, Seminole County, OK, Sequoyah County, OK, Stephens County, OK, Tillman County, OK, Tulsa County, OK, Wagoner County, OK, Washington County, OK, Washita County, OK, Woods County, OK, Woodward County, OK

The radar

The Norman radar (KTLX), 64 km from the middle of the area, began a volume at 17:01 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.

What SPC expected

The probabilities SPC published with the watch, for the watch area over its life.

Two or more tornadoes
40%
One or more EF2 to EF5 tornadoes
20%
Ten or more severe wind reports
70%
One or more gusts of 65 knots or more
60%
Ten or more severe hail reports
70%
One or more hailstones of 2 inches or more
60%
Six or more combined severe hail and wind reports
95%

Warnings issued inside it

76 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.

IssuedProductOfficeCountiesLasted
May 27, 12:14 PM CDTSevere Thunderstorm WarningOUNGarfield, Kingfisher, Logan46 min
May 27, 12:23 PM CDTSevere Thunderstorm WarningOUNBlaine, Custer, Dewey52 min
May 27, 12:29 PM CDTSevere Thunderstorm WarningOUNBlaine, Garfield, Kingfisher46 min
May 27, 12:46 PM CDTSevere Thunderstorm WarningTSACraig, Delaware, Ottawa44 min
May 27, 12:48 PM CDTSevere Thunderstorm WarningOUNGarfield, Grant, Kay, Noble42 min
May 27, 12:51 PM CDTSevere Thunderstorm WarningOUNBlaine, Garfield, Kingfisher39 min
May 27, 12:57 PM CDTSevere Thunderstorm WarningTSAOsage27 min
May 27, 12:58 PM CDTSevere Thunderstorm WarningOUNGarfield, Kingfisher, Logan, Noble, Payne47 min
May 27, 1:01 PM CDTSevere Thunderstorm WarningOUNAlfalfa, Garfield, Grant, Major, Noble44 min
May 27, 1:14 PM CDTTornado WarningOUNKingfisher46 min
May 27, 1:23 PM CDTSevere Thunderstorm WarningOUNMajor, Woods, Woodward39 min
May 27, 1:25 PM CDTSevere Thunderstorm WarningOUNKay, Noble36 min
May 27, 1:29 PM CDTSevere Thunderstorm WarningOUNGarfield, Kingfisher, Logan46 min
May 27, 1:30 PM CDTFlash Flood WarningTSAOttawa6 hr
May 27, 1:41 PM CDTFlash Flood WarningOUNBlaine, Kingfisher, Logan4 hr
May 27, 1:42 PM CDTSevere Thunderstorm WarningOUNNoble, Payne17 min
May 27, 1:47 PM CDTSevere Thunderstorm WarningOUNKingfisher, Logan43 min
May 27, 2:15 PM CDTSevere Thunderstorm WarningOUNKingfisher, Logan, Payne45 min
May 27, 2:34 PM CDTSevere Thunderstorm WarningOUNLincoln, Logan, Payne56 min
May 27, 2:37 PM CDTSevere Thunderstorm WarningTSANowata, Osage, Rogers, Washington53 min
May 27, 2:40 PM CDTSevere Thunderstorm WarningOUNGarfield, Major50 min
May 27, 2:46 PM CDTFlash Flood WarningOUNLincoln, Logan, Oklahoma, Payne3 hr
May 27, 2:51 PM CDTSevere Thunderstorm WarningOUNCanadian, Kingfisher, Logan39 min
May 27, 3:08 PM CDTSevere Thunderstorm WarningTSARogers, Tulsa, Washington52 min
May 27, 3:18 PM CDTSevere Thunderstorm WarningOUNGarfield, Logan, Noble, Payne42 min
May 27, 3:18 PM CDTSevere Thunderstorm WarningTSACreek57 min
May 27, 3:23 PM CDTSevere Thunderstorm WarningTSAOsage37 min
May 27, 3:27 PM CDTSevere Thunderstorm WarningOUNGarfield, Major48 min
May 27, 3:27 PM CDTSevere Thunderstorm WarningOUNCanadian, Kingfisher, Lincoln, Logan, Oklahoma, Payne48 min
May 27, 3:27 PM CDTSevere Thunderstorm WarningTSACraig, Mayes, Nowata, Rogers63 min
May 27, 3:30 PM CDTSevere Thunderstorm WarningOUNLincoln, Payne30 min
May 27, 3:34 PM CDTSevere Thunderstorm WarningOUNGarfield, Kingfisher, Logan, Noble, Payne41 min
May 27, 3:39 PM CDTFlash Flood WarningOUNGarfield, Kingfisher, Logan, Major, Noble, Payne2 hr
May 27, 3:42 PM CDTSevere Thunderstorm WarningTSACreek, Okfuskee48 min
May 27, 3:49 PM CDTSevere Thunderstorm WarningTSACraig, Mayes, Nowata, Osage, Pawnee, Rogers and 2 more56 min
May 27, 3:51 PM CDTSevere Thunderstorm WarningOUNLogan24 min
May 27, 3:51 PM CDTFlash Flood WarningTSACraig, Nowata3 hr
May 27, 3:53 PM CDTSevere Thunderstorm WarningOUNNoble37 min
May 27, 4:03 PM CDTSevere Thunderstorm WarningOUNCanadian, Kingfisher, Logan27 min
May 27, 4:08 PM CDTFlash Flood WarningTSAOsage, Washington3 hr
May 27, 4:10 PM CDTSevere Thunderstorm WarningOUNLincoln, Logan, Oklahoma, Payne65 min
May 27, 4:15 PM CDTSevere Thunderstorm WarningOUNBlaine, Dewey, Garfield, Kingfisher, Major45 min
May 27, 4:18 PM CDTFlash Flood WarningTSAOsage, Pawnee, Rogers, Tulsa, Washington3 hr
May 27, 4:24 PM CDTSevere Thunderstorm WarningOUNLogan, Noble, Payne38 min
May 27, 4:34 PM CDTSevere Thunderstorm WarningTSACraig, Delaware, Mayes, Ottawa56 min
May 27, 4:51 PM CDTSevere Thunderstorm WarningTSACreek, Okfuskee39 min
May 27, 4:53 PM CDTSevere Thunderstorm WarningOUNCanadian, Kingfisher, Logan37 min
May 27, 4:56 PM CDTSevere Thunderstorm WarningOUNBlaine, Garfield, Kingfisher, Logan, Major49 min
May 27, 4:59 PM CDTFlash Flood WarningTSACraig, Delaware, Mayes, Rogers3 hr
May 27, 5:00 PM CDTSevere Thunderstorm WarningOUNLincoln, Oklahoma45 min
May 27, 5:19 PM CDTSevere Thunderstorm WarningOUNCanadian, Lincoln, Logan, Oklahoma41 min
May 27, 5:25 PM CDTFlash Flood Warning Considerable damage threatOUNCanadian, Kingfisher, Lincoln, Logan, Oklahoma3 hr
May 27, 5:26 PM CDTSevere Thunderstorm WarningTSACreek, Okfuskee64 min
May 27, 5:39 PM CDTSevere Thunderstorm WarningTSACherokee, Muskogee, Wagoner51 min
May 27, 5:47 PM CDTFlash Flood WarningOUNKingfisher, Logan106 min
May 27, 5:52 PM CDTSevere Thunderstorm WarningOUNKingfisher, Logan38 min
May 27, 6:00 PM CDTFlash Flood WarningOUNCanadian, Lincoln, Oklahoma, Pottawatomie3 hr
May 27, 6:03 PM CDTSevere Thunderstorm WarningOUNCanadian, Cleveland, Grady, Lincoln, McClain, Oklahoma and 2 more42 min
May 27, 6:06 PM CDTSevere Thunderstorm WarningTSAOkfuskee39 min
May 27, 6:07 PM CDTFlash Flood WarningTSACreek, Okfuskee, Okmulgee3 hr
May 27, 6:10 PM CDTSevere Thunderstorm WarningTSAOkfuskee, Okmulgee50 min
May 27, 6:21 PM CDTFlash Flood Warning Considerable damage threatOUNCanadian, Cleveland, Oklahoma3 hr
May 27, 6:26 PM CDTFlash Flood WarningTSAAdair, Cherokee, Muskogee, Okmulgee, Wagoner2 hr
May 27, 6:35 PM CDTSevere Thunderstorm WarningTSAOkfuskee, Okmulgee40 min
May 27, 6:48 PM CDTSevere Thunderstorm WarningOUNCaddo, Canadian, Washita15 min
May 27, 6:51 PM CDTSevere Thunderstorm WarningTSAMcIntosh, Muskogee, Okmulgee39 min
May 27, 6:55 PM CDTFlash Flood WarningOUNCanadian, Cleveland, Grady, McClain2 hr
May 27, 6:59 PM CDTSevere Thunderstorm WarningTSAMcIntosh, Okfuskee, Okmulgee, Pittsburg46 min
May 27, 7:07 PM CDTTornado WarningTSAMcIntosh28 min
May 27, 7:32 PM CDTSevere Thunderstorm WarningTSAHaskell, McIntosh, Muskogee, Pittsburg43 min
May 27, 7:37 PM CDTFlash Flood WarningTSAAdair, Cherokee, Haskell, McIntosh, Muskogee, Okfuskee and 3 more3 hr
May 27, 7:51 PM CDTSevere Thunderstorm WarningOUNJackson39 min
May 27, 8:01 PM CDTSevere Thunderstorm WarningTSAHaskell, Latimer, LeFlore, Pittsburg44 min
May 27, 8:36 PM CDTSevere Thunderstorm WarningTSAHaskell, Latimer, LeFlore39 min
May 27, 8:47 PM CDTFlash Flood WarningTSAHaskell, Latimer, LeFlore, Pittsburg, Pushmataha, Sequoyah2 hr
May 27, 8:52 PM CDTSevere Thunderstorm WarningTSALeFlore53 min

Discussions around it

SPC mesoscale discussions over the same counties from four hours before the watch to its end.

The nearest sounding before it

Norman, OK (KOUN), launched 12:00Z, 5.0 hours before the alert went out and 72 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 2021-05-27Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2431 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Norman, OK at 12:00Z on 2021-05-27The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 264 square meters per square second.193958Sfc1 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
2431 J/kg
Mixed-layer CIN
-121 J/kg
Mixed-layer LCL
765 m above ground
0-6 km bulk shear
43 kt
0-1 km storm-relative helicity
264 m²/s²
0-3 km storm-relative helicity
360 m²/s²
Significant tornado parameter
1.5
Supercell composite
7.5

Open this sounding in Storm Lab

The text

As transmitted.

743 
WWUS20 KWNS 271655
SEL5  
SPC WW 271655
OKZ000-280000-

URGENT - IMMEDIATE BROADCAST REQUESTED
Tornado Watch Number 215
NWS Storm Prediction Center Norman OK
1155 AM CDT Thu May 27 2021

The NWS Storm Prediction Center has issued a

* Tornado Watch for portions of 
  Northern and Central Oklahoma

* Effective this Thursday morning and evening from 1155 AM until
  700 PM CDT.

* Primary threats include...
  A couple tornadoes possible
  Scattered damaging winds and isolated significant gusts to 80
    mph likely
  Scattered large hail and isolated very large hail events to 3
    inches in diameter likely

SUMMARY...Thunderstorms will develop and intensify through the
afternoon across the watch area, with supercells possible.  Very
large hail and damaging winds are the main threat, but there is some
concern for a few tornadoes in the most intense cells.

The tornado watch area is approximately along and 65 statute miles
north and south of a line from 50 miles west northwest of Clinton OK
to 20 miles south southeast of Fayetteville AR. For a complete
depiction of the watch see the associated watch outline update
(WOUS64 KWNS WOU5).

PRECAUTIONARY/PREPAREDNESS ACTIONS...

REMEMBER...A Tornado Watch means conditions are favorable for
tornadoes and severe thunderstorms in and close to the watch
area. Persons in these areas should be on the lookout for
threatening weather conditions and listen for later statements
and possible warnings.

&&

OTHER WATCH INFORMATION...CONTINUE...WW 214...

AVIATION...Tornadoes and a few severe thunderstorms with hail
surface and aloft to 3 inches. Extreme turbulence and surface wind
gusts to 70 knots. A few cumulonimbi with maximum tops to 600. Mean
storm motion vector 28030.

...Hart

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 27, 11:04 AM CDTMesoscale DiscussionSPCBaxter, Benton, Boone, Carroll, Cleburne, Crawford and 15 more86 min
May 27, 11:29 AM CDTMesoscale DiscussionSPCCrawford61 min
May 27, 2:06 PM CDTMesoscale DiscussionSPCBaxter, Boone, Clay, Cleburne, Conway, Craighead and 23 more84 min
May 27, 4:52 PM CDTMesoscale DiscussionSPCArkansas, Baxter, Benton, Boone, Carroll, Clark and 47 more83 min
May 27, 5:12 PM CDTSevere Thunderstorm WatchSPCArkansas, Baxter, Benton, Boone, Carroll, Clark and 41 more8 hr
May 27, 5:21 PM CDTMesoscale DiscussionSPCClay, Craighead, Greene, Mississippi114 min
May 27, 12:51 AM CDTMesoscale DiscussionSPCBarton, Buchanan, Platte84 min
May 27, 1:05 AM CDTSevere Thunderstorm WatchSPCBates, Buchanan, Cass, Clay, Jackson, Platte and 1 more7 hr
May 27, 5:28 AM CDTMesoscale DiscussionSPCCass, Jackson92 min
May 27, 11:26 AM CDTSevere Thunderstorm WatchSPCBarry, Barton, Bollinger, Camden, Cape Girardeau, Carter and 45 more8 hr
May 27, 12:57 PM CDTMesoscale DiscussionSPCBarry, Christian, Crawford, Dallas, Dent, Franklin and 14 more93 min
May 27, 1:36 PM CDTMesoscale DiscussionSPCAndrew, Buchanan, Cass, Clay, Clinton, DeKalb and 2 more54 min
May 27, 2:20 PM CDTMesoscale DiscussionSPCBarry, Bollinger, Butler, Cape Girardeau, Carter, Christian and 27 more85 min
May 27, 3:38 PM CDTMesoscale DiscussionSPCBollinger, Cape Girardeau, Carter, Madison, Oregon, Perry and 3 more67 min
May 27, 6:03 PM CDTMesoscale DiscussionSPCAdair, Audrain, Boone, Buchanan, Caldwell, Carroll and 27 more87 min
May 26, 7:32 PM CDTMesoscale DiscussionSPCBeaver, Ellis, Harper88 min
May 26, 11:26 PM CDTMesoscale DiscussionSPCAlfalfa, Beckham, Blaine, Caddo, Canadian, Custer and 20 more64 min
May 27, 1:39 PM CDTMesoscale DiscussionSPCBlaine, Garfield, Grant, Kay, Kingfisher, Logan and 6 more66 min
May 27, 3:25 PM CDTMesoscale DiscussionSPCBlaine, Canadian, Craig, Creek, Custer, Dewey and 13 more95 min
May 27, 5:34 PM CDTMesoscale DiscussionSPCCaddo, Cleveland, Comanche, Garvin, Grady, McClain and 2 more56 min
May 27, 6:24 PM CDTMesoscale DiscussionSPCHarmon2 hr

Nearby

Tornado Watches in Oklahoma, 2021Every tornado watch 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.