Alert archive / Oklahoma / Severe Thunderstorm Watches in 2017

Severe Thunderstorm Watch 208

May 11, 20174 states

The Storm Prediction Center issued this severe thunderstorm watch at May 11, 2017, 12:56 PM CDT for 4 states. It was in force for 8 hr.

The area

The outline as issued.

The facts

Issued: May 11, 2017, 12:56 PM CDT (17:56 UTC)
Expired: May 11, 2017, 9:00 PM CDT
In force: 8 hr
Issued by: the Storm Prediction Center
Largest hail expected: 3 in
Strongest gust expected: 60 kt

All 61 counties

Benton County, AR, Carroll County, AR, Crawford County, AR, Franklin County, AR, Madison County, AR, Sebastian County, AR, Washington County, AR, Chautauqua County, KS, Cherokee County, KS, Cowley County, KS, Crawford County, KS, Labette County, KS, Montgomery County, KS, Sumner County, KS, Barry County, MO, Barton County, MO, Dade County, MO, Jasper County, MO, Lawrence County, MO, McDonald County, MO, Newton County, MO, Stone County, MO, Adair County, OK, Alfalfa County, OK, Blaine County, OK, Caddo County, OK, Canadian County, OK, Cherokee County, OK, Choctaw County, OK, Craig County, OK, Creek County, OK, Delaware County, OK, Garfield County, OK, Grant County, OK, Haskell County, OK, Kay County, OK, Kingfisher County, OK, Latimer County, OK, LeFlore County, OK, Lincoln County, OK, Logan County, OK, Major County, OK, Mayes County, OK, McIntosh 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, Pushmataha County, OK, Rogers County, OK, Sequoyah County, OK, Tulsa County, OK, Wagoner County, OK, Washington County, OK

The radar

The Tulsa radar (KINX), 79 km from the middle of the area, began a volume at 17:59 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: 20%
One or more EF2 to EF5 tornadoes: 5%
Ten or more severe wind reports: 20%
One or more gusts of 65 knots or more: 5%
Ten or more severe hail reports: 60%
One or more hailstones of 2 inches or more: 40%
Six or more combined severe hail and wind reports: 80%

Warnings issued inside it

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

Issued	Product	Office	Counties	Lasted
May 11, 1:17 PM CDT	Severe Thunderstorm Warning	TSA	Muskogee, Okmulgee	28 min
May 11, 1:24 PM CDT	Severe Thunderstorm Warning	OUN	Kingfisher	51 min
May 11, 1:43 PM CDT	Severe Thunderstorm Warning	TSA	Muskogee, Okmulgee, Rogers, Tulsa, Wagoner	47 min
May 11, 1:48 PM CDT	Severe Thunderstorm Warning	OUN	Grant, Kay	42 min
May 11, 1:53 PM CDT	Severe Thunderstorm Warning	TSA	Rogers, Tulsa	52 min
May 11, 2:00 PM CDT	Severe Thunderstorm Warning	OUN	Garfield	45 min
May 11, 2:02 PM CDT	Tornado Warning	TSA	Rogers	28 min
May 11, 2:03 PM CDT	Severe Thunderstorm Warning	OUN	Garfield, Kingfisher, Logan	42 min
May 11, 2:06 PM CDT	Severe Thunderstorm Warning	OUN	Kingfisher, Logan	39 min
May 11, 2:11 PM CDT	Severe Thunderstorm Warning	TSA	Osage, Pawnee	34 min
May 11, 2:14 PM CDT	Severe Thunderstorm Warning	SGF	Newton	46 min
May 11, 2:19 PM CDT	Severe Thunderstorm Warning	OUN	Noble	41 min
May 11, 2:24 PM CDT	Severe Thunderstorm Warning	TSA	Rogers, Tulsa	36 min
May 11, 2:26 PM CDT	Severe Thunderstorm Warning	OUN	Grant, Kay	49 min
May 11, 2:28 PM CDT	Severe Thunderstorm Warning	TSA	Sebastian	32 min
May 11, 2:29 PM CDT	Tornado Warning	TSA	Rogers	15 min
May 11, 2:38 PM CDT	Severe Thunderstorm Warning	OUN	Garfield, Logan, Noble, Payne	52 min
May 11, 2:40 PM CDT	Severe Thunderstorm Warning	OUN	Lincoln, Logan, Payne	50 min
May 11, 2:41 PM CDT	Severe Thunderstorm Warning	TSA	Craig, Nowata	34 min
May 11, 2:44 PM CDT	Severe Thunderstorm Warning	OUN	Noble	46 min
May 11, 2:50 PM CDT	Tornado Warning	OUN	Logan, Noble, Payne	25 min
May 11, 2:52 PM CDT	Severe Thunderstorm Warning	TSA	Craig, Delaware, Ottawa	38 min
May 11, 2:57 PM CDT	Severe Thunderstorm Warning	SGF	Newton	21 min
May 11, 2:57 PM CDT	Severe Thunderstorm Warning	OUN	Kay	48 min
May 11, 2:57 PM CDT	Severe Thunderstorm Warning	TSA	Osage, Washington	13 min
May 11, 3:00 PM CDT	Severe Thunderstorm Warning	TSA	Franklin, Sebastian	30 min
May 11, 3:06 PM CDT	Severe Thunderstorm Warning	SGF	McDonald, Newton	24 min
May 11, 3:09 PM CDT	Flash Flood Warning	SGF	Newton	6 hr
May 11, 3:09 PM CDT	Tornado Warning	OUN	Lincoln, Payne	24 min
May 11, 3:11 PM CDT	Tornado Warning	OUN	Noble, Payne	20 min
May 11, 3:13 PM CDT	Severe Thunderstorm Warning	ICT	Labette, Montgomery, Neosho, Wilson	39 min
May 11, 3:16 PM CDT	Severe Thunderstorm Warning	OUN	Major	44 min
May 11, 3:17 PM CDT	Flash Flood Warning	TSA	Craig, Delaware, Nowata, Ottawa, Rogers	4 hr
May 11, 3:22 PM CDT	Severe Thunderstorm Warning	TSA	Osage, Pawnee	53 min
May 11, 3:26 PM CDT	Severe Thunderstorm Warning	OUN	Noble, Payne	19 min
May 11, 3:28 PM CDT	Severe Thunderstorm Warning	SGF	McDonald, Newton	47 min
May 11, 3:28 PM CDT	Severe Thunderstorm Warning	OUN	Lincoln, Payne	47 min
May 11, 3:29 PM CDT	Severe Thunderstorm Warning	TSA	Franklin	17 min
May 11, 3:31 PM CDT	Severe Thunderstorm Warning	SGF	Barry, Lawrence, Newton	44 min
May 11, 3:31 PM CDT	Flash Flood Warning	OUN	Noble	5 hr
May 11, 3:32 PM CDT	Severe Thunderstorm Warning	OUN	Alfalfa, Woods	43 min
May 11, 3:38 PM CDT	Severe Thunderstorm Warning	TSA	Osage	52 min
May 11, 3:39 PM CDT	Severe Thunderstorm Warning	OUN	Blaine, Dewey	51 min
May 11, 3:43 PM CDT	Severe Thunderstorm Warning	ICT	Kingman, Sedgwick, Sumner	39 min
May 11, 3:43 PM CDT	Severe Thunderstorm Warning	OUN	Lincoln, Logan, Oklahoma	47 min
May 11, 3:50 PM CDT	Severe Thunderstorm Warning	TSA	Creek, Osage, Pawnee	40 min
May 11, 3:58 PM CDT	Flash Flood Warning	SGF	Barry, Lawrence	6 hr
May 11, 3:58 PM CDT	Severe Thunderstorm Warning	OUN	Alfalfa, Major, Woods	29 min
May 11, 4:11 PM CDT	Tornado Warning	SGF	Christian, Greene, Lawrence	49 min
May 11, 4:16 PM CDT	Severe Thunderstorm Warning	OUN	Blaine, Kingfisher	44 min
May 11, 4:16 PM CDT	Severe Thunderstorm Warning	TSA	Osage	44 min
May 11, 4:22 PM CDT	Severe Thunderstorm Warning	TSA	Osage	23 min
May 11, 4:25 PM CDT	Severe Thunderstorm Warning	TSA	Creek, Osage, Pawnee, Tulsa	50 min
May 11, 4:27 PM CDT	Severe Thunderstorm Warning	SGF	Christian, Greene, Stone	63 min
May 11, 4:30 PM CDT	Tornado Warning	SGF	Christian, Greene, Stone	32 min
May 11, 4:31 PM CDT	Severe Thunderstorm Warning	OUN	Blaine, Kingfisher	29 min
May 11, 4:31 PM CDT	Tornado Warning	TSA	Osage	29 min
May 11, 4:33 PM CDT	Tornado Warning	TSA	Osage	27 min
May 11, 4:46 PM CDT	Tornado Warning	TSA	Osage, Washington	29 min
May 11, 4:52 PM CDT	Severe Thunderstorm Warning	TSA	Osage, Washington	38 min
May 11, 4:57 PM CDT	Severe Thunderstorm Warning	OUN	Kingfisher	48 min
May 11, 5:05 PM CDT	Severe Thunderstorm Warning	TSA	Creek, Mayes, Okmulgee, Osage, Rogers, Tulsa and 2 more	40 min
May 11, 5:06 PM CDT	Tornado Warning	TSA	Nowata, Rogers, Washington	24 min
May 11, 5:24 PM CDT	Tornado Warning	TSA	Nowata, Rogers, Washington	18 min
May 11, 5:26 PM CDT	Flash Flood Warning	ICT	Kingman, Sedgwick, Sumner	5 hr
May 11, 5:38 PM CDT	Flash Flood Warning	ICT	Chautauqua	6 hr
May 11, 5:42 PM CDT	Severe Thunderstorm Warning	TSA	Craig, Mayes, Rogers, Tulsa	48 min
May 11, 5:52 PM CDT	Tornado Warning	TSA	Rogers	23 min
May 11, 6:04 PM CDT	Severe Thunderstorm Warning	TSA	Rogers, Tulsa, Wagoner	41 min
May 11, 6:10 PM CDT	Tornado Warning	TSA	Mayes, Rogers	16 min
May 11, 6:24 PM CDT	Severe Thunderstorm Warning	TSA	Muskogee, Okmulgee, Wagoner	51 min
May 11, 6:32 PM CDT	Severe Thunderstorm Warning	TSA	Craig, Delaware, Mayes	28 min
May 11, 6:53 PM CDT	Severe Thunderstorm Warning	TSA	Craig, Delaware, Mayes, Ottawa	52 min
May 11, 7:01 PM CDT	Severe Thunderstorm Warning	TSA	Cherokee, Delaware, Mayes	44 min
May 11, 7:30 PM CDT	Severe Thunderstorm Warning	TSA	Delaware, Ottawa	30 min
May 11, 7:33 PM CDT	Severe Thunderstorm Warning	TSA	Cherokee, Delaware	42 min
May 11, 8:17 PM CDT	Severe Thunderstorm Warning	TSA	Adair, Cherokee	43 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, 5.9 hours before the alert went out and 165 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: 592 J/kg
Mixed-layer CIN: -121 J/kg
Mixed-layer LCL: 1262 m above ground
0-6 km bulk shear: 49 kt
0-1 km storm-relative helicity: 106 m²/s²
0-3 km storm-relative helicity: 91 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 1.8

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 11, 1:37 PM CDT	Mesoscale Discussion	SPC	Hempstead, Howard, Lafayette, Little River, Miller, Sevier	2 hr
May 11, 2:43 PM CDT	Severe Thunderstorm Watch	SPC	Columbia, Hempstead, Howard, Lafayette, Little River, Miller and 3 more	9 hr
May 11, 2:49 PM CDT	Mesoscale Discussion	SPC	Baxter, Benton, Boone, Carroll, Clark, Cleburne and 34 more	116 min
May 11, 3:17 PM CDT	Severe Thunderstorm Watch	SPC	Arkansas, Baxter, Boone, Bradley, Calhoun, Clark and 45 more	7 hr
May 11, 5:49 PM CDT	Mesoscale Discussion	SPC	Arkansas, Baxter, Boone, Bradley, Calhoun, Carroll and 56 more	56 min
May 11, 6:07 PM CDT	Mesoscale Discussion	SPC	Benton, Washington	83 min
May 11, 11:44 AM CDT	Mesoscale Discussion	SPC	Barber, Butler, Chautauqua, Comanche, Cowley, Elk and 6 more	3 hr

Nearby

Severe Thunderstorm Watches in Oklahoma, 2017 Severe Thunderstorm Watches in Missouri, 2017 Severe Thunderstorm Watches in Arkansas, 2017 Every severe thunderstorm watch in 2017

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.