Alert archive / Oklahoma / Tornado Watches in 2013

Tornado Watch 191

May 20, 20137 counties in Arkansas; 55 counties in Oklahoma; 4 counties in Texas

The Storm Prediction Center issued this tornado watch at May 20, 2013, 1:10 PM CDT for 7 counties in Arkansas; 55 counties in Oklahoma; 4 counties in Texas. It was in force for 9 hr.

The area

The outline as issued.

The facts

Issued: May 20, 2013, 1:10 PM CDT (18:10 UTC)
Expired: May 20, 2013, 10:00 PM CDT
In force: 9 hr
Issued by: the Storm Prediction Center
Largest hail expected: 4 in
Strongest gust expected: 60 kt

All 66 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, 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, Delaware County, OK, Garvin County, OK, Grady County, OK, Haskell County, OK, Hughes County, OK, Jefferson County, OK, Johnston County, OK, Kay County, OK, Kingfisher County, OK, Latimer County, OK, LeFlore County, OK, Lincoln County, OK, Logan County, OK, Love 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, Rogers County, OK, Seminole County, OK, Sequoyah County, OK, Stephens County, OK, Tillman County, OK, Tulsa County, OK, Wagoner County, OK, Washington County, OK, Archer County, TX, Baylor County, TX, Clay County, TX, Wichita County, TX

The radar

The Norman radar (KTLX), 75 km from the middle of the area, began a volume at 18:07 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: 80%
One or more gusts of 65 knots or more: 10%
Ten or more severe hail reports: 90%
One or more hailstones of 2 inches or more: 30%
Six or more combined severe hail and wind reports: 95%

Warnings issued inside it

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

Issued	Product	Office	Counties	Lasted
May 20, 2:00 PM CDT	Severe Thunderstorm Warning	OUN	Garvin, Grady, McClain	60 min
May 20, 2:01 PM CDT	Severe Thunderstorm Warning	OUN	Comanche, Grady, Stephens	59 min
May 20, 2:12 PM CDT	Severe Thunderstorm Warning	OUN	Canadian, Cleveland, Grady, McClain, Oklahoma	48 min
May 20, 2:18 PM CDT	Severe Thunderstorm Warning	OUN	Canadian, Logan, Oklahoma	42 min
May 20, 2:22 PM CDT	Severe Thunderstorm Warning	OUN	Cotton	53 min
May 20, 2:39 PM CDT	Severe Thunderstorm Warning	OUN	Cotton, Jefferson, Stephens	66 min
May 20, 2:40 PM CDT	Tornado Warning	OUN	Cleveland, Grady, McClain, Oklahoma	35 min
May 20, 2:42 PM CDT	Tornado Warning	OUN	Carter, Garvin, Grady, Stephens	33 min
May 20, 3:00 PM CDT	Severe Thunderstorm Warning	TSA	Osage	45 min
May 20, 3:01 PM CDT	Tornado Warning Emergency	OUN	Cleveland, McClain, Oklahoma	44 min
May 20, 3:04 PM CDT	Severe Thunderstorm Warning	TSA	Osage, Pawnee	56 min
May 20, 3:07 PM CDT	Severe Thunderstorm Warning	OUN	Cotton, Jefferson, Stephens	53 min
May 20, 3:11 PM CDT	Tornado Warning	OUN	Carter, Garvin, Grady, Stephens	64 min
May 20, 3:11 PM CDT	Severe Thunderstorm Warning	OUN	Archer, Baylor, Wichita	49 min
May 20, 3:21 PM CDT	Severe Thunderstorm Warning	OUN	Lincoln, Logan, Payne	39 min
May 20, 3:26 PM CDT	Tornado Warning	OUN	Cotton, Jefferson	64 min
May 20, 3:39 PM CDT	Severe Thunderstorm Warning	TSA	Nowata, Osage, Rogers, Tulsa, Washington	66 min
May 20, 3:40 PM CDT	Tornado Warning	OUN	Cleveland, Lincoln, Oklahoma, Pottawatomie	35 min
May 20, 3:43 PM CDT	Severe Thunderstorm Warning	TSA	Creek, Osage, Pawnee	62 min
May 20, 3:47 PM CDT	Tornado Warning	TSA	Nowata, Osage, Rogers, Tulsa, Washington	43 min
May 20, 3:57 PM CDT	Severe Thunderstorm Warning	OUN	Archer, Clay, Wichita	48 min
May 20, 3:58 PM CDT	Tornado Warning	OUN	Garvin, Stephens	62 min
May 20, 3:59 PM CDT	Severe Thunderstorm Warning	OUN	Cleveland, Lincoln, Oklahoma	46 min
May 20, 4:03 PM CDT	Severe Thunderstorm Warning	TSA	Nowata, Osage, Washington	57 min
May 20, 4:09 PM CDT	Severe Thunderstorm Warning	OUN	Clay	51 min
May 20, 4:10 PM CDT	Tornado Warning	OUN	Lincoln	35 min
May 20, 4:14 PM CDT	Tornado Warning	OUN	Jefferson	61 min
May 20, 4:23 PM CDT	Tornado Warning	TSA	Nowata, Rogers, Washington	37 min
May 20, 4:31 PM CDT	Severe Thunderstorm Warning	TSA	Osage, Pawnee, Rogers, Tulsa, Washington	59 min
May 20, 4:36 PM CDT	Tornado Warning	OUN	Garvin, McClain, Pottawatomie	39 min
May 20, 4:37 PM CDT	Severe Thunderstorm Warning	TSA	Nowata, Osage, Washington	68 min
May 20, 4:41 PM CDT	Severe Thunderstorm Warning	OUN	Archer, Clay, Wichita	49 min
May 20, 4:42 PM CDT	Tornado Warning	OUN	Lincoln	33 min
May 20, 4:45 PM CDT	Tornado Warning	TSA	Creek, Okfuskee	30 min
May 20, 4:49 PM CDT	Severe Thunderstorm Warning	OUN	Cleveland, Grady, McClain	56 min
May 20, 4:50 PM CDT	Tornado Warning	TSA	Nowata	25 min
May 20, 4:58 PM CDT	Tornado Warning	OUN	Carter, Jefferson, Love	62 min
May 20, 5:00 PM CDT	Severe Thunderstorm Warning	OUN	Hughes	30 min
May 20, 5:05 PM CDT	Severe Thunderstorm Warning	OUN	Garvin, Hughes, McClain, Pontotoc, Pottawatomie, Seminole	55 min
May 20, 5:05 PM CDT	Severe Thunderstorm Warning	TSA	McIntosh, Muskogee, Okfuskee, Okmulgee	55 min
May 20, 5:06 PM CDT	Tornado Warning	OUN	Jefferson	39 min
May 20, 5:14 PM CDT	Severe Thunderstorm Warning	OUN	Jefferson, Stephens	46 min
May 20, 5:16 PM CDT	Severe Thunderstorm Warning	OUN	Logan, Noble, Payne	44 min
May 20, 5:16 PM CDT	Severe Thunderstorm Warning	TSA	Nowata, Osage, Rogers, Tulsa, Washington	44 min
May 20, 5:24 PM CDT	Severe Thunderstorm Warning	TSA	Craig, Nowata, Rogers	66 min
May 20, 5:30 PM CDT	Severe Thunderstorm Warning	OUN	Carter, Johnston, Murray	60 min
May 20, 5:39 PM CDT	Tornado Warning	OUN	Jefferson	36 min
May 20, 5:44 PM CDT	Severe Thunderstorm Warning	TSA	Adair, Cherokee, McIntosh, Muskogee, Sequoyah	61 min
May 20, 5:52 PM CDT	Severe Thunderstorm Warning	OUN	Carter, Jefferson, Love	38 min
May 20, 5:53 PM CDT	Severe Thunderstorm Warning	TSA	Craig, Delaware, Mayes, Nowata, Ottawa, Rogers	67 min
May 20, 5:57 PM CDT	Tornado Warning	OUN	Carter, Johnston, Marshall	48 min
May 20, 6:08 PM CDT	Severe Thunderstorm Warning	OUN	Coal, Johnston, Murray, Pontotoc	67 min
May 20, 6:26 PM CDT	Severe Thunderstorm Warning	TSA	Benton, Crawford, Washington	64 min
May 20, 6:29 PM CDT	Tornado Warning	TSA	Ottawa	31 min
May 20, 6:36 PM CDT	Tornado Warning	TSA	Benton, Washington	39 min
May 20, 6:36 PM CDT	Severe Thunderstorm Warning	OUN	Jefferson, Love	39 min
May 20, 6:37 PM CDT	Tornado Warning	OUN	Atoka, Coal, Johnston	23 min
May 20, 6:40 PM CDT	Severe Thunderstorm Warning	OUN	Atoka, Johnston	65 min
May 20, 6:40 PM CDT	Severe Thunderstorm Warning	OUN	Carter, Love, Marshall	50 min
May 20, 6:47 PM CDT	Severe Thunderstorm Warning	OUN	Lincoln, Logan, Oklahoma	43 min
May 20, 6:54 PM CDT	Tornado Warning	OUN	Atoka, Coal, Johnston	36 min
May 20, 6:55 PM CDT	Severe Thunderstorm Warning	TSA	Adair, Haskell, LeFlore, Muskogee, Sequoyah	65 min
May 20, 6:59 PM CDT	Severe Thunderstorm Warning	TSA	Haskell, Latimer, LeFlore, Pittsburg, Pushmataha	61 min
May 20, 7:00 PM CDT	Severe Thunderstorm Warning	TSA	Benton, Carroll	60 min
May 20, 7:01 PM CDT	Tornado Warning	OUN	Carter, Love, Marshall	44 min
May 20, 7:04 PM CDT	Tornado Warning	TSA	Benton, Madison, Washington	41 min
May 20, 7:04 PM CDT	Tornado Warning	TSA	Latimer, Pittsburg, Pushmataha	41 min
May 20, 7:19 PM CDT	Tornado Warning	OUN	Johnston, Marshall	26 min
May 20, 7:23 PM CDT	Severe Thunderstorm Warning	TSA	Crawford, Sebastian, Washington	67 min
May 20, 7:25 PM CDT	Tornado Warning	TSA	Benton, Carroll, Madison	50 min
May 20, 7:31 PM CDT	Tornado Warning	TSA	Crawford, Sebastian	44 min
May 20, 7:37 PM CDT	Severe Thunderstorm Warning	OUN	Atoka, Coal, Johnston	68 min
May 20, 7:40 PM CDT	Severe Thunderstorm Warning	OUN	Bryan, Johnston, Marshall	50 min
May 20, 7:41 PM CDT	Severe Thunderstorm Warning	TSA	Carroll, Madison, Washington	64 min
May 20, 7:44 PM CDT	Tornado Warning	OUN	Atoka, Coal, Johnston	46 min
May 20, 7:50 PM CDT	Severe Thunderstorm Warning	TSA	Sebastian	70 min
May 20, 7:55 PM CDT	Severe Thunderstorm Warning	OUN	Love	50 min
May 20, 7:57 PM CDT	Severe Thunderstorm Warning	TSA	Crawford, Franklin, Madison, Sebastian, Washington	63 min
May 20, 8:02 PM CDT	Severe Thunderstorm Warning	TSA	Crawford	58 min
May 20, 8:07 PM CDT	Severe Thunderstorm Warning	TSA	Choctaw, Latimer, Pittsburg, Pushmataha	68 min
May 20, 8:11 PM CDT	Severe Thunderstorm Warning	OUN	Atoka, Bryan	49 min
May 20, 8:18 PM CDT	Severe Thunderstorm Warning	TSA	Crawford, Sebastian	57 min
May 20, 8:28 PM CDT	Severe Thunderstorm Warning	OUN	Carter, Johnston, Love, Marshall	47 min
May 20, 8:30 PM CDT	Tornado Warning	TSA	Crawford, Sebastian	60 min
May 20, 8:42 PM CDT	Severe Thunderstorm Warning	TSA	Carroll, Madison	48 min
May 20, 8:52 PM CDT	Tornado Warning	TSA	Haskell, LeFlore, Sequoyah	38 min
May 20, 8:57 PM CDT	Severe Thunderstorm Warning	TSA	Sebastian	63 min
May 20, 9:05 PM CDT	Tornado Warning	TSA	Crawford, Sebastian	40 min
May 20, 9:06 PM CDT	Severe Thunderstorm Warning	OUN	Atoka, Bryan, Johnston	39 min
May 20, 9:09 PM CDT	Severe Thunderstorm Warning	OUN	Carter, Johnston, Marshall, Murray	51 min
May 20, 9:20 PM CDT	Tornado Warning	TSA	Crawford, Franklin, Sebastian	40 min
May 20, 9:24 PM CDT	Severe Thunderstorm Warning	TSA	Crawford, Franklin, Madison	66 min
May 20, 9:38 PM CDT	Severe Thunderstorm Warning	TSA	Crawford, Franklin	37 min
May 20, 9:43 PM CDT	Tornado Warning	TSA	Franklin	47 min
May 20, 9:44 PM CDT	Severe Thunderstorm Warning	OUN	Atoka, Bryan	46 min
May 20, 10:00 PM CDT	Severe Thunderstorm Warning	OUN	Comanche, Cotton	45 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, 6.2 hours before the alert went out and 92 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: 2243 J/kg
Mixed-layer CIN: -192 J/kg
Mixed-layer LCL: 830 m above ground
0-6 km bulk shear: 50 kt
0-1 km storm-relative helicity: 298 m²/s²
0-3 km storm-relative helicity: 297 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 14.5

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 19, 10:44 PM CDT	Tornado Watch	SPC	Benton, Crawford, Washington	5 hr
May 20, 12:26 PM CDT	Mesoscale Discussion	SPC	Benton, Washington	2 hr
May 20, 6:53 PM CDT	Mesoscale Discussion	SPC	Baxter, Boone, Cleburne, Conway, Franklin, Fulton and 16 more	67 min
May 19, 7:13 PM CDT	Mesoscale Discussion	SPC	Clark	62 min
May 19, 7:55 PM CDT	Mesoscale Discussion	SPC	Andrew, Atchison, Buchanan, Clay, Clinton, DeKalb and 4 more	65 min
May 19, 8:10 PM CDT	Tornado Watch	SPC	Clark, Scotland	6 hr
May 19, 10:16 PM CDT	Mesoscale Discussion	SPC	Adair, Audrain, Barry, Barton, Bates, Benton and 52 more	59 min
May 19, 11:49 PM CDT	Mesoscale Discussion	SPC	Barry, Barton, Camden, Cedar, Christian, Dade and 17 more	56 min
May 20, 8:46 AM CDT	Mesoscale Discussion	SPC	Bates, Benton, Cass, Henry, Jackson, Johnson and 4 more	59 min
May 20, 12:46 PM CDT	Tornado Watch	SPC	Barry, Barton, Bates, Benton, Boone, Callaway and 41 more	8 hr
May 20, 3:27 PM CDT	Mesoscale Discussion	SPC	Audrain, Lincoln, Marion, Monroe, Montgomery, Pike and 2 more	63 min
May 20, 5:07 PM CDT	Mesoscale Discussion	SPC	Audrain, Crawford, Franklin, Gasconade, Lincoln, Marion and 8 more	23 min
May 20, 5:24 PM CDT	Tornado Watch	SPC	Audrain, Boone, Callaway, Clark, Cole, Crawford and 20 more	7 hr
May 20, 5:38 PM CDT	Mesoscale Discussion	SPC	Andrew, DeKalb, Gentry, Harrison, Worth	67 min
May 19, 8:53 PM CDT	Mesoscale Discussion	SPC	Adair, Atoka, Bryan, Canadian, Carter, Cherokee and 48 more	67 min
May 20, 2:44 AM CDT	Mesoscale Discussion	SPC	Craig, Delaware, Mayes, Nowata, Osage, Ottawa and 3 more	2 hr
May 20, 2:31 PM CDT	Mesoscale Discussion	SPC	Craig, Creek, Lincoln, Logan, Nowata, Okfuskee and 7 more	119 min
May 20, 5:34 PM CDT	Mesoscale Discussion	SPC	Love	56 min
May 20, 6:33 PM CDT	Mesoscale Discussion	SPC	Bryan, Johnston, Love, Marshall	57 min
May 20, 1:19 PM CDT	Mesoscale Discussion	SPC	Bell, Bosque, Brown, Burnet, Callahan, Clay and 29 more	116 min
May 20, 2:21 PM CDT	Tornado Watch	SPC	Bosque, Brown, Burnet, Callahan, Coleman, Collin and 33 more	8 hr

Nearby

Tornado Watches in Oklahoma, 2013 Tornado Watches in Arkansas, 2013 Tornado Watches in Texas, 2013 Every tornado watch in 2013

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.