Alert archive / Oklahoma / Tornado Watches in 2006

Tornado Watch 318

May 9, 200618 counties in Oklahoma

The Storm Prediction Center issued this tornado watch at May 9, 2006, 4:04 PM CDT for 18 counties in Oklahoma. It was in force for 7 hr.

The area

The outline as issued.

The facts

Issued: May 9, 2006, 4:04 PM CDT (21:04 UTC)
Expired: May 9, 2006, 10:57 PM CDT
In force: 7 hr
Issued by: the Storm Prediction Center
Largest hail expected: 4 in
Strongest gust expected: 60 kt

Counties Atoka County, OK, Bryan County, OK, Choctaw County, OK, Coal County, OK, Haskell County, OK, Hughes County, OK, Johnston County, OK, Latimer County, OK, LeFlore County, OK, Marshall County, OK, McCurtain County, OK, McIntosh County, OK, Okfuskee County, OK, Pittsburg County, OK, Pontotoc County, OK, Pottawatomie County, OK, Pushmataha County, OK, Seminole County, OK

The radar

The Norman radar (KTLX), 131 km from the middle of the area, began a volume at 21:04 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: 30%
One or more gusts of 65 knots or more: 30%
Ten or more severe hail reports: 50%
One or more hailstones of 2 inches or more: 50%
Six or more combined severe hail and wind reports: 60%

Warnings issued inside it

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

Issued	Product	Office	Counties	Lasted
May 9, 5:53 PM CDT	Severe Thunderstorm Warning	OUN	Hughes	52 min
May 9, 5:58 PM CDT	Severe Thunderstorm Warning	TSA	Pittsburg	77 min
May 9, 6:01 PM CDT	Severe Thunderstorm Warning	TSA	McIntosh	59 min
May 9, 6:11 PM CDT	Severe Thunderstorm Warning	OUN	Coal	49 min
May 9, 6:36 PM CDT	Tornado Warning	OUN	Coal	24 min
May 9, 6:43 PM CDT	Severe Thunderstorm Warning	OUN	Hughes	32 min
May 9, 6:46 PM CDT	Tornado Warning	TSA	Pittsburg	59 min
May 9, 6:48 PM CDT	Severe Thunderstorm Warning	TSA	McIntosh	57 min
May 9, 6:57 PM CDT	Tornado Warning	OUN	Coal	33 min
May 9, 7:09 PM CDT	Severe Thunderstorm Warning	OUN	Atoka	51 min
May 9, 7:10 PM CDT	Severe Thunderstorm Warning	TSA	Latimer	80 min
May 9, 7:14 PM CDT	Severe Thunderstorm Warning	OUN	Hughes	46 min
May 9, 7:30 PM CDT	Tornado Warning	OUN	Atoka, Coal	45 min
May 9, 7:33 PM CDT	Flash Flood Warning	TSA	Pittsburg	117 min
May 9, 7:41 PM CDT	Tornado Warning	TSA	Latimer	49 min
May 9, 7:43 PM CDT	Flash Flood Warning	OUN	Coal	3 hr
May 9, 7:44 PM CDT	Tornado Warning	TSA	Pittsburg	31 min
May 9, 7:51 PM CDT	Severe Thunderstorm Warning	TSA	Pushmataha	84 min
May 9, 7:54 PM CDT	Tornado Warning	TSA	LeFlore	66 min
May 9, 7:57 PM CDT	Severe Thunderstorm Warning	TSA	McIntosh	63 min
May 9, 8:12 PM CDT	Tornado Warning	OUN	Atoka	33 min
May 9, 8:18 PM CDT	Severe Thunderstorm Warning	OUN	Bryan	42 min
May 9, 8:22 PM CDT	Severe Thunderstorm Warning	OUN	Coal	38 min
May 9, 8:28 PM CDT	Severe Thunderstorm Warning	TSA	LeFlore	92 min
May 9, 8:31 PM CDT	Severe Thunderstorm Warning	TSA	Latimer	29 min
May 9, 8:35 PM CDT	Flash Flood Warning	OUN	Atoka	3 hr
May 9, 8:46 PM CDT	Tornado Warning	OUN	Atoka	15 min
May 9, 8:58 PM CDT	Severe Thunderstorm Warning	TSA	Haskell, Sequoyah	62 min
May 9, 9:03 PM CDT	Severe Thunderstorm Warning	OUN	Atoka	42 min
May 9, 9:10 PM CDT	Severe Thunderstorm Warning	TSA	Choctaw, Pushmataha	95 min
May 9, 9:20 PM CDT	Flash Flood Warning	TSA	Choctaw, LeFlore, Pushmataha	115 min
May 9, 9:23 PM CDT	Severe Thunderstorm Warning	SHV	McCurtain	97 min
May 9, 9:26 PM CDT	Severe Thunderstorm Warning	OUN	Bryan	64 min
May 9, 9:46 PM CDT	Severe Thunderstorm Warning	OUN	Atoka	44 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, 9.1 hours before the alert went out and 137 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: 1694 J/kg
Mixed-layer CIN: -324 J/kg
Mixed-layer LCL: 1000 m above ground
0-6 km bulk shear: 34 kt
0-1 km storm-relative helicity: 386 m²/s²
0-3 km storm-relative helicity: 449 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.2

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 9, 1:13 AM CDT	Mesoscale Discussion	SPC	Alfalfa, Craig, Grant, Kay, Mayes, Noble and 6 more	92 min
May 9, 4:24 AM CDT	Severe Thunderstorm Watch	SPC	Craig, Delaware, Mayes, Nowata, Osage, Ottawa and 2 more	4 hr
May 9, 3:45 PM CDT	Mesoscale Discussion	SPC	Atoka, Bryan, Carter, Choctaw, Cleveland, Coal and 24 more	2 hr
May 9, 4:46 PM CDT	Mesoscale Discussion	SPC	Adair, Cherokee, Craig, Delaware, Mayes, Nowata and 5 more	89 min
May 9, 4:56 PM CDT	Mesoscale Discussion	SPC	Beaver, Beckham, Custer, Dewey, Ellis, Harper and 5 more	2 hr
May 9, 5:07 PM CDT	Tornado Watch	SPC	Adair, Cherokee, Creek, Delaware, Mayes, Muskogee and 5 more	6 hr
May 9, 6:01 PM CDT	Severe Thunderstorm Watch	SPC	Beaver, Beckham, Custer, Dewey, Ellis, Greer and 8 more	7 hr
May 9, 6:30 PM CDT	Mesoscale Discussion	SPC	Adair, Atoka, Bryan, Cherokee, Choctaw, Coal and 17 more	90 min

Nearby

Tornado Watches in Oklahoma, 2006 Every tornado watch in 2006

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.