Alert archive / Oklahoma / Tornado Watches in 2010

Tornado Watch 192

May 19, 201028 counties in Oklahoma

The Storm Prediction Center issued this tornado watch at May 19, 2010, 9:35 PM CDT for 28 counties in Oklahoma. It was in force for 4 hr.

The area

The outline as issued.

The facts

Issued: May 19, 2010, 9:35 PM CDT (02:35 UTC)
Expired: May 20, 2010, 2:00 AM CDT
In force: 4 hr
Issued by: the Storm Prediction Center
Largest hail expected: 2 in
Strongest gust expected: 60 kt

All 28 counties

Atoka County, OK, Bryan County, OK, Carter County, OK, Cherokee County, OK, Choctaw County, OK, Coal County, OK, Garvin County, OK, Haskell County, OK, Hughes County, OK, Johnston County, OK, Latimer County, OK, LeFlore County, OK, Love County, OK, Marshall County, OK, Mayes 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, Wagoner County, OK

The radar

The Norman radar (KTLX), 123 km from the middle of the area, began a volume at 02:37 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: 40%
One or more gusts of 65 knots or more: 30%
Ten or more severe hail reports: 40%
One or more hailstones of 2 inches or more: 30%
Six or more combined severe hail and wind reports: 80%

Warnings issued inside it

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

Issued	Product	Office	Counties	Lasted
May 19, 9:40 PM CDT	Tornado Warning	TSA	Cherokee, Delaware, Mayes, Rogers, Wagoner	50 min
May 19, 9:47 PM CDT	Severe Thunderstorm Warning	TSA	Adair, Cherokee, Delaware, Mayes, Muskogee, Sequoyah and 1 more	58 min
May 19, 9:58 PM CDT	Severe Thunderstorm Warning	TSA	LeFlore, Sequoyah	45 min
May 19, 10:01 PM CDT	Flash Flood Warning	TSA	Cherokee, Delaware, Mayes, Muskogee, Rogers, Wagoner	6 hr
May 19, 10:04 PM CDT	Severe Thunderstorm Warning	OUN	Hughes, Lincoln, Pottawatomie, Seminole	56 min
May 19, 10:07 PM CDT	Severe Thunderstorm Warning	OUN	Coal, Hughes, Pontotoc	53 min
May 19, 10:26 PM CDT	Severe Thunderstorm Warning	TSA	McIntosh, Muskogee	64 min
May 19, 10:37 PM CDT	Severe Thunderstorm Warning	TSA	Adair, Cherokee, Delaware, Sequoyah	53 min
May 19, 10:37 PM CDT	Severe Thunderstorm Warning	TSA	Latimer, Pittsburg, Pushmataha	53 min
May 19, 10:53 PM CDT	Flash Flood Warning	TSA	McIntosh, Muskogee	6 hr
May 19, 10:56 PM CDT	Severe Thunderstorm Warning	OUN	Atoka, Coal, Hughes, Pontotoc	64 min
May 19, 11:25 PM CDT	Severe Thunderstorm Warning	TSA	Latimer, Pittsburg	35 min
May 19, 11:38 PM CDT	Severe Thunderstorm Warning	TSA	Latimer, Pushmataha	67 min
May 19, 11:43 PM CDT	Severe Thunderstorm Warning	TSA	Haskell, McIntosh, Muskogee, Sequoyah	62 min
May 19, 11:46 PM CDT	Flash Flood Warning	TSA	Adair, Haskell, LeFlore, Sequoyah	6 hr
May 19, 11:59 PM CDT	Severe Thunderstorm Warning	OUN	Atoka	46 min
May 20, 12:02 AM CDT	Severe Thunderstorm Warning	OUN	McClain, Pottawatomie, Seminole	43 min
May 20, 12:24 AM CDT	Flash Flood Warning	TSA	Haskell, Latimer, LeFlore, McIntosh, Muskogee, Pittsburg and 1 more	6 hr
May 20, 12:33 AM CDT	Severe Thunderstorm Warning	TSA	Haskell, Latimer, LeFlore, Sequoyah	57 min
May 20, 1:30 AM CDT	Severe Thunderstorm Warning	TSA	Latimer, LeFlore, Pushmataha	45 min
May 20, 1:41 AM CDT	Severe Thunderstorm Warning	OUN	Hughes	49 min
May 20, 1:55 AM CDT	Severe Thunderstorm Warning	OUN	Coal, Hughes, Pontotoc, Seminole	50 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 00:00Z, 2.6 hours before the alert went out and 129 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: 1598 J/kg
Mixed-layer CIN: -6 J/kg
Mixed-layer LCL: 954 m above ground
0-6 km bulk shear: 28 kt
0-1 km storm-relative helicity: 259 m²/s²
0-3 km storm-relative helicity: 410 m²/s²
Significant tornado parameter: 2.8
Supercell composite: 18.7

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, 7:32 PM CDT	Tornado Watch	SPC	Benton, Clark, Crawford, Franklin, Garland, Hot Spring and 10 more	6 hr
May 19, 9:05 PM CDT	Mesoscale Discussion	SPC	Crawford, Howard, Logan, Montgomery, Pike, Polk and 4 more	85 min
May 19, 11:09 PM CDT	Mesoscale Discussion	SPC	Benton, Boone, Carroll, Conway, Crawford, Franklin and 20 more	96 min
May 20, 1:54 AM CDT	Mesoscale Discussion	SPC	Howard, Little River, Logan, Montgomery, Pike, Polk and 4 more	66 min
May 20, 2:05 AM CDT	Severe Thunderstorm Watch	SPC	Calhoun, Clark, Columbia, Dallas, Garland, Hempstead and 12 more	7 hr
May 20, 8:57 AM CDT	Mesoscale Discussion	SPC	Chicot	63 min
May 20, 10:28 AM CDT	Severe Thunderstorm Watch	SPC	Ashley, Chicot	12 hr
May 20, 12:44 PM CDT	Severe Thunderstorm Watch	SPC	Crittenden, Mississippi	9 hr
May 19, 7:32 PM CDT	Mesoscale Discussion	SPC	Atoka, Bryan, Carter, Cherokee, Choctaw, Cleveland and 29 more	58 min
May 20, 4:59 AM CDT	Mesoscale Discussion	SPC	Atoka, Bryan, Johnston, Marshall	61 min

Nearby

Tornado Watches in Oklahoma, 2010 Every tornado watch in 2010

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.