Alert archive / Oklahoma / Severe Thunderstorm Watches in 2012

Severe Thunderstorm Watch 350

June 3, 20127 counties in Arkansas; 20 counties in Oklahoma

The Storm Prediction Center issued this severe thunderstorm watch at Jun 3, 2012, 11:25 PM CDT for 7 counties in Arkansas; 20 counties in Oklahoma. It was in force for 8 hr.

The area

The outline as issued.

The facts

Issued: Jun 3, 2012, 11:25 PM CDT (04:25 UTC)
Expired: Jun 4, 2012, 7:00 AM CDT
In force: 8 hr
Issued by: the Storm Prediction Center
Largest hail expected: 2 in
Strongest gust expected: 60 kt

All 27 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, Cherokee County, OK, Craig County, OK, Creek County, OK, Delaware County, OK, Haskell County, OK, LeFlore County, OK, Mayes County, OK, McIntosh County, OK, Muskogee County, OK, Nowata County, OK, Okmulgee County, OK, Osage County, OK, Ottawa County, OK, Pawnee County, OK, Rogers County, OK, Sequoyah County, OK, Tulsa County, OK, Wagoner County, OK, Washington County, OK

The radar

The Tulsa radar (KINX), 3 km from the middle of the area, began a volume at 04:26 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: 10%
One or more EF2 to EF5 tornadoes: 2%
Ten or more severe wind reports: 30%
One or more gusts of 65 knots or more: 10%
Ten or more severe hail reports: 60%
One or more hailstones of 2 inches or more: 20%
Six or more combined severe hail and wind reports: 80%

Warnings issued inside it

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

Issued	Product	Office	Counties	Lasted
Jun 3, 11:54 PM CDT	Severe Thunderstorm Warning	TSA	Osage	48 min
Jun 4, 12:03 AM CDT	Severe Thunderstorm Warning	TSA	Osage, Rogers, Tulsa, Washington	57 min
Jun 4, 12:20 AM CDT	Severe Thunderstorm Warning	TSA	Madison	30 min
Jun 4, 1:16 AM CDT	Flash Flood Warning	TSA	Osage, Rogers, Tulsa	6 hr
Jun 4, 1:19 AM CDT	Severe Thunderstorm Warning	TSA	Osage, Pawnee	43 min
Jun 4, 1:37 AM CDT	Severe Thunderstorm Warning	TSA	Creek, Osage, Rogers, Tulsa, Wagoner	53 min
Jun 4, 1:42 AM CDT	Severe Thunderstorm Warning	TSA	Delaware, Mayes	33 min
Jun 4, 2:00 AM CDT	Severe Thunderstorm Warning	TSA	Creek, McIntosh, Muskogee, Okfuskee, Okmulgee, Tulsa and 1 more	41 min
Jun 4, 2:18 AM CDT	Severe Thunderstorm Warning	TSA	Cherokee, McIntosh, Muskogee, Sequoyah, Wagoner	57 min
Jun 4, 2:23 AM CDT	Flash Flood Warning	TSA	Creek, Osage, Rogers, Tulsa, Wagoner	6 hr
Jun 4, 2:27 AM CDT	Flash Flood Warning	TSA	Osage	6 hr
Jun 4, 2:34 AM CDT	Severe Thunderstorm Warning	TSA	Adair, Cherokee	56 min
Jun 4, 3:03 AM CDT	Severe Thunderstorm Warning	TSA	Crawford, Washington	57 min
Jun 4, 3:27 AM CDT	Severe Thunderstorm Warning	TSA	Crawford, Sebastian	63 min
Jun 4, 3:27 AM CDT	Flash Flood Warning	TSA	Osage, Pawnee	5 hr
Jun 4, 3:59 AM CDT	Severe Thunderstorm Warning	TSA	Franklin, Sebastian	61 min
Jun 4, 6:00 AM CDT	Flash Flood Warning	TSA	Creek, Osage, Pawnee, Tulsa	3 hr
Jun 4, 6:08 AM CDT	Flash Flood Warning	TSA	McIntosh, Muskogee	3 hr

Discussions around it

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

The nearest sounding before it

Lamont, OK (KLMN), launched 00:00Z, 4.4 hours before the alert went out and 178 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: 3251 J/kg
Mixed-layer CIN: -50 J/kg
Mixed-layer LCL: 1507 m above ground
0-6 km bulk shear: 40 kt
0-1 km storm-relative helicity: 60 m²/s²
0-3 km storm-relative helicity: 234 m²/s²
Significant tornado parameter: 1.0
Supercell composite: 11.1

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 3, 7:09 PM CDT	Tornado Watch	SPC	Clay, Craighead, Crittenden, Cross, Greene, Lawrence and 5 more	7 hr
Jun 3, 7:47 PM CDT	Mesoscale Discussion	SPC	Benton, Carroll, Washington	58 min
Jun 3, 8:34 PM CDT	Mesoscale Discussion	SPC	Clay, Craighead, Crittenden, Cross, Faulkner, Greene and 6 more	56 min
Jun 4, 1:51 AM CDT	Mesoscale Discussion	SPC	Benton, Crawford, Madison, Washington	54 min
Jun 4, 3:14 AM CDT	Mesoscale Discussion	SPC	Crittenden	91 min
Jun 4, 3:39 AM CDT	Mesoscale Discussion	SPC	Cleburne, Conway, Crawford, Faulkner, Franklin, Johnson and 6 more	96 min
Jun 4, 1:07 PM CDT	Mesoscale Discussion	SPC	Arkansas, Bradley, Calhoun, Cleburne, Cleveland, Conway and 19 more	113 min
Jun 4, 5:06 PM CDT	Mesoscale Discussion	SPC	Arkansas, Ashley, Bradley, Calhoun, Chicot, Cleveland and 13 more	114 min
Jun 3, 8:03 PM CDT	Mesoscale Discussion	SPC	Beaver, Beckham, Ellis, Greer, Harmon, Harper and 3 more	57 min
Jun 3, 9:46 PM CDT	Mesoscale Discussion	SPC	Beckham, Blaine, Caddo, Canadian, Cleveland, Comanche and 27 more	59 min
Jun 3, 10:06 PM CDT	Severe Thunderstorm Watch	SPC	Beckham, Blaine, Caddo, Canadian, Comanche, Cotton and 14 more	3 hr
Jun 4, 3:59 PM CDT	Mesoscale Discussion	SPC	Cimarron, Texas	91 min

Nearby

Severe Thunderstorm Watches in Oklahoma, 2012 Severe Thunderstorm Watches in Arkansas, 2012 Every severe thunderstorm watch in 2012

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.