Alert archive / Oklahoma / Tornado Watches in 2019

Tornado Watch 677

October 20, 20197 counties in Arkansas; 36 counties in Oklahoma

The Storm Prediction Center issued this tornado watch at Oct 20, 2019, 8:27 PM CDT for 7 counties in Arkansas; 36 counties in Oklahoma. It was in force for 5 hr.

The area

The outline as issued.

The facts

Issued: Oct 20, 2019, 8:27 PM CDT (01:27 UTC)
Expired: Oct 21, 2019, 1:48 AM CDT
In force: 5 hr
Issued by: the Storm Prediction Center
Largest hail expected: 2.5 in
Strongest gust expected: 70 kt

All 43 counties

Benton County, AR, Carroll County, AR, Crawford County, AR, Franklin County, AR, Madison County, AR, Sebastian County, AR, Washington County, AR, Adair County, OK, Atoka County, OK, Bryan County, OK, Carter County, OK, Cherokee County, OK, Choctaw County, OK, Cleveland County, OK, Coal County, OK, Creek County, OK, Delaware County, OK, Garvin County, OK, Haskell County, OK, Hughes County, OK, Jefferson County, OK, Johnston County, OK, Latimer County, OK, LeFlore County, OK, Love County, OK, Marshall County, OK, Mayes County, OK, McClain County, OK, McIntosh County, OK, Murray County, OK, Muskogee County, OK, Okfuskee County, OK, Okmulgee County, OK, Pittsburg County, OK, Pontotoc County, OK, Pottawatomie County, OK, Pushmataha County, OK, Rogers County, OK, Seminole County, OK, Sequoyah County, OK, Stephens County, OK, Tulsa County, OK, Wagoner County, OK

The radar

The Western Arkansas radar (KSRX), 62 km from the middle of the area, began a volume at 01:27 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: 70%
One or more EF2 to EF5 tornadoes: 50%
Ten or more severe wind reports: 70%
One or more gusts of 65 knots or more: 60%
Ten or more severe hail reports: 60%
One or more hailstones of 2 inches or more: 60%
Six or more combined severe hail and wind reports: 95%

Warnings issued inside it

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

Issued	Product	Office	Counties	Lasted
Oct 20, 8:28 PM CDT	Severe Thunderstorm Warning	OUN	Cleveland, McClain, Pottawatomie	31 min
Oct 20, 8:36 PM CDT	Severe Thunderstorm Warning	TSA	Creek, Okmulgee, Rogers, Tulsa, Wagoner	15 min
Oct 20, 8:51 PM CDT	Severe Thunderstorm Warning	OUN	Cleveland, Garvin, Grady, McClain, Stephens	39 min
Oct 20, 8:54 PM CDT	Severe Thunderstorm Warning	OUN	Atoka, Coal, Hughes, Johnston	51 min
Oct 20, 8:55 PM CDT	Severe Thunderstorm Warning	OUN	Lincoln, Pottawatomie, Seminole	50 min
Oct 20, 8:58 PM CDT	Severe Thunderstorm Warning	OUN	Lincoln, Pottawatomie, Seminole	32 min
Oct 20, 9:00 PM CDT	Severe Thunderstorm Warning	TSA	Creek, Okfuskee	45 min
Oct 20, 9:10 PM CDT	Severe Thunderstorm Warning	TSA	Creek, Osage, Pawnee, Tulsa	35 min
Oct 20, 9:13 PM CDT	Severe Thunderstorm Warning	OUN	Cleveland, Lincoln, Oklahoma, Pottawatomie, Seminole	47 min
Oct 20, 9:23 PM CDT	Severe Thunderstorm Warning	OUN	Cleveland, Garvin, McClain, Murray, Pottawatomie, Stephens	52 min
Oct 20, 9:25 PM CDT	Severe Thunderstorm Warning	TSA	Mayes, Rogers, Wagoner	35 min
Oct 20, 9:28 PM CDT	Severe Thunderstorm Warning	TSA	Creek, Okfuskee, Okmulgee	47 min
Oct 20, 9:33 PM CDT	Severe Thunderstorm Warning	TSA	Nowata, Osage, Rogers, Washington	42 min
Oct 20, 9:36 PM CDT	Severe Thunderstorm Warning	OUN	Cleveland, Lincoln, McClain, Oklahoma, Pottawatomie	39 min
Oct 20, 9:36 PM CDT	Severe Thunderstorm Warning	OUN	Cleveland, Lincoln, McClain, Oklahoma, Pottawatomie	39 min
Oct 20, 9:41 PM CDT	Severe Thunderstorm Warning	TSA	Creek, Osage, Rogers, Tulsa, Washington	34 min
Oct 20, 9:46 PM CDT	Severe Thunderstorm Warning	TSA	Creek, Okfuskee, Okmulgee, Tulsa	44 min
Oct 20, 9:47 PM CDT	Tornado Warning	OUN	Cleveland, McClain, Pottawatomie	28 min
Oct 20, 9:59 PM CDT	Severe Thunderstorm Warning	OUN	Garvin, Hughes, McClain, Murray, Pontotoc, Pottawatomie and 1 more	46 min
Oct 20, 9:59 PM CDT	Severe Thunderstorm Warning	TSA	Delaware, Mayes, Ottawa	27 min
Oct 20, 10:01 PM CDT	Tornado Warning	OUN	McClain, Pontotoc, Pottawatomie, Seminole	29 min
Oct 20, 10:13 PM CDT	Severe Thunderstorm Warning	TSA	Craig, Mayes, Nowata, Rogers, Tulsa, Washington	47 min
Oct 20, 10:14 PM CDT	Severe Thunderstorm Warning	TSA	Muskogee, Okmulgee, Tulsa, Wagoner	29 min
Oct 20, 10:17 PM CDT	Severe Thunderstorm Warning	OUN	Cleveland, Lincoln, Oklahoma, Pottawatomie, Seminole	28 min
Oct 20, 10:19 PM CDT	Tornado Warning	OUN	Hughes, Seminole	26 min
Oct 20, 10:21 PM CDT	Severe Thunderstorm Warning	TSA	Creek, Osage, Pawnee, Tulsa, Washington	24 min
Oct 20, 10:23 PM CDT	Severe Thunderstorm Warning	TSA	Creek, Okmulgee, Tulsa	37 min
Oct 20, 10:26 PM CDT	Severe Thunderstorm Warning	TSA	McIntosh, Okfuskee, Okmulgee, Pittsburg	49 min
Oct 20, 10:36 PM CDT	Severe Thunderstorm Warning	OUN	Hughes, Pontotoc, Seminole	39 min
Oct 20, 10:44 PM CDT	Severe Thunderstorm Warning	OUN	Carter, Garvin, Hughes, Johnston, McClain, Murray and 3 more	46 min
Oct 20, 10:48 PM CDT	Severe Thunderstorm Warning	TSA	Mayes, Okmulgee, Rogers, Tulsa, Wagoner	16 min
Oct 20, 10:53 PM CDT	Severe Thunderstorm Warning	OUN	Carter, Johnston, Love, Marshall	52 min
Oct 20, 10:58 PM CDT	Severe Thunderstorm Warning	TSA	Craig, Delaware, Ottawa	47 min
Oct 20, 11:00 PM CDT	Severe Thunderstorm Warning	TSA	Haskell, McIntosh, Muskogee, Okfuskee, Okmulgee, Pittsburg	45 min
Oct 20, 11:10 PM CDT	Severe Thunderstorm Warning	OUN	Hughes	50 min
Oct 20, 11:13 PM CDT	Severe Thunderstorm Warning	OUN	Atoka, Bryan, Johnston, Love, Marshall	47 min
Oct 20, 11:14 PM CDT	Severe Thunderstorm Warning	TSA	Cherokee, Mayes, Wagoner	31 min
Oct 20, 11:16 PM CDT	Severe Thunderstorm Warning	OUN	Coal, Hughes, Pontotoc, Seminole	44 min
Oct 20, 11:24 PM CDT	Tornado Warning	OUN	Bryan, Johnston, Marshall	14 min
Oct 20, 11:29 PM CDT	Severe Thunderstorm Warning	TSA	Adair, Cherokee, Haskell, McIntosh, Muskogee, Sequoyah and 1 more	46 min
Oct 20, 11:34 PM CDT	Severe Thunderstorm Warning	TSA	Benton	41 min
Oct 20, 11:41 PM CDT	Tornado Warning	TSA	Adair, Cherokee, Delaware	16 min
Oct 20, 11:44 PM CDT	Severe Thunderstorm Warning	OUN	Atoka, Bryan	46 min
Oct 20, 11:59 PM CDT	Tornado Warning	TSA	Washington	31 min
Oct 21, 12:02 AM CDT	Tornado Warning	TSA	Benton	28 min
Oct 21, 12:04 AM CDT	Severe Thunderstorm Warning	TSA	Benton, Carroll, Crawford, Franklin, Madison, Sebastian and 1 more	41 min
Oct 21, 12:07 AM CDT	Severe Thunderstorm Warning	TSA	Latimer, Pittsburg, Pushmataha	53 min
Oct 21, 12:24 AM CDT	Severe Thunderstorm Warning	OUN	Bryan	21 min
Oct 21, 12:25 AM CDT	Tornado Warning	TSA	Benton, Carroll	35 min
Oct 21, 12:30 AM CDT	Tornado Warning	TSA	Benton	30 min
Oct 21, 12:41 AM CDT	Severe Thunderstorm Warning	TSA	Benton, Carroll, Crawford, Franklin, Madison, Sebastian and 1 more	49 min
Oct 21, 12:42 AM CDT	Severe Thunderstorm Warning	TSA	Sebastian	48 min
Oct 21, 12:49 AM CDT	Severe Thunderstorm Warning	TSA	Choctaw	41 min
Oct 21, 1:25 AM CDT	Severe Thunderstorm Warning	TSA	Carroll, Crawford, Franklin, Madison, Sebastian	21 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

Springfield, MO (KSGF), launched 00:00Z, 1.5 hours before the alert went out and 185 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: 183 J/kg
Mixed-layer CIN: -126 J/kg
Mixed-layer LCL: 1000 m above ground
0-6 km bulk shear: 54 kt
0-1 km storm-relative helicity: 270 m²/s²
0-3 km storm-relative helicity: 251 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 0.8

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Oct 20, 7:01 PM CDT	Tornado Watch	SPC	Columbia, Hempstead, Howard, Lafayette, Little River, Miller and 2 more	7 hr
Oct 20, 10:19 PM CDT	Mesoscale Discussion	SPC	Benton, Washington	86 min
Oct 20, 11:32 PM CDT	Mesoscale Discussion	SPC	Baxter, Clark, Cleburne, Cleveland, Conway, Dallas and 27 more	88 min
Oct 20, 11:48 PM CDT	Tornado Watch	SPC	Arkansas, Baxter, Boone, Bradley, Calhoun, Clark and 41 more	8 hr
Oct 21, 1:50 AM CDT	Tornado Watch	SPC	Columbia, Hempstead, Howard, Lafayette, Little River, Miller and 3 more	5 hr
Oct 21, 3:06 AM CDT	Tornado Watch	SPC	Clay, Craighead, Crittenden, Cross, Greene, Lee and 4 more	6 hr
Oct 21, 4:57 AM CDT	Mesoscale Discussion	SPC	Ashley, Bradley, Chicot, Desha, Drew	63 min
Oct 21, 5:30 AM CDT	Severe Thunderstorm Watch	SPC	Ashley, Chicot	4 hr
Oct 20, 9:39 PM CDT	Mesoscale Discussion	SPC	Barry, Barton, Bates, Benton, Camden, Cedar and 21 more	96 min
Oct 20, 10:21 PM CDT	Tornado Watch	SPC	Barry, Barton, Camden, Cedar, Christian, Dade and 24 more	5 hr
Oct 21, 1:54 AM CDT	Mesoscale Discussion	SPC	Bollinger, Butler, Cape Girardeau, Carter, Iron, Madison and 11 more	2 hr
Oct 20, 7:58 PM CDT	Mesoscale Discussion	SPC	Atoka, Carter, Cherokee, Coal, Creek, Haskell and 14 more	92 min
Oct 20, 9:57 PM CDT	Mesoscale Discussion	SPC	Coal, Hughes, McIntosh, Murray, Pittsburg, Pontotoc and 1 more	93 min

Nearby

Tornado Watches in Oklahoma, 2019 Tornado Watches in Arkansas, 2019 Every tornado watch in 2019

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.