Alert archive / Oklahoma / Tornado Watches in 2008

Tornado Watch 245

May 1, 200841 counties in Oklahoma

The Storm Prediction Center issued this tornado watch at May 1, 2008, 6:15 PM CDT for 41 counties in Oklahoma. It was in force for 7 hr.

The area

The outline as issued.

The facts

Issued: May 1, 2008, 6:15 PM CDT (23:15 UTC)
Expired: May 2, 2008, 1:00 AM CDT
In force: 7 hr
Issued by: the Storm Prediction Center
Largest hail expected: 3.5 in
Strongest gust expected: 70 kt

All 41 counties

Canadian County, OK, Carter County, OK, Cleveland County, OK, Coal County, OK, Cotton County, OK, Craig County, OK, Creek County, OK, Garfield County, OK, Garvin County, OK, Grady County, OK, Grant County, OK, Hughes County, OK, Jefferson County, OK, Johnston County, OK, Kay County, OK, Kingfisher 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, Pawnee County, OK, Payne County, OK, Pontotoc County, OK, Pottawatomie County, OK, Rogers County, OK, Seminole County, OK, Stephens County, OK, Tulsa County, OK, Wagoner County, OK, Washington County, OK

The radar

The Norman radar (KTLX), 64 km from the middle of the area, began a volume at 23:16 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: 60%
One or more EF2 to EF5 tornadoes: 30%
Ten or more severe wind reports: 60%
One or more gusts of 65 knots or more: 50%
Ten or more severe hail reports: 80%
One or more hailstones of 2 inches or more: 80%
Six or more combined severe hail and wind reports: 90%

Warnings issued inside it

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

Issued	Product	Office	Counties	Lasted
May 1, 6:23 PM CDT	Severe Thunderstorm Warning	OUN	Cleveland, McClain, Oklahoma	52 min
May 1, 6:42 PM CDT	Severe Thunderstorm Warning	OUN	Noble, Payne	48 min
May 1, 6:55 PM CDT	Severe Thunderstorm Warning	OUN	Oklahoma	65 min
May 1, 7:02 PM CDT	Tornado Warning	OUN	Cleveland, Oklahoma	43 min
May 1, 7:08 PM CDT	Severe Thunderstorm Warning	TSA	Osage, Pawnee	67 min
May 1, 7:11 PM CDT	Severe Thunderstorm Warning	OUN	Logan, Payne	34 min
May 1, 7:21 PM CDT	Severe Thunderstorm Warning	OUN	Lincoln, Logan, Oklahoma	24 min
May 1, 7:24 PM CDT	Tornado Warning	OUN	Noble, Payne	21 min
May 1, 7:26 PM CDT	Tornado Warning	OUN	Lincoln, Logan, Payne	34 min
May 1, 7:28 PM CDT	Tornado Warning	OUN	Lincoln, Oklahoma	47 min
May 1, 7:38 PM CDT	Tornado Warning	TSA	Pawnee	67 min
May 1, 7:42 PM CDT	Severe Thunderstorm Warning	TSA	Osage, Pawnee	63 min
May 1, 7:43 PM CDT	Tornado Warning	OUN	Noble, Payne	17 min
May 1, 7:56 PM CDT	Severe Thunderstorm Warning	OUN	Noble, Payne	11 min
May 1, 8:06 PM CDT	Severe Thunderstorm Warning	OUN	Lincoln	44 min
May 1, 8:28 PM CDT	Tornado Warning	TSA	Osage, Pawnee	62 min
May 1, 8:36 PM CDT	Tornado Warning	OUN	Lincoln, Payne	39 min
May 1, 8:45 PM CDT	Tornado Warning	TSA	Creek, Pawnee	31 min
May 1, 9:06 PM CDT	Severe Thunderstorm Warning	OUN	Payne	16 min
May 1, 9:21 PM CDT	Tornado Warning	TSA	Osage	30 min
May 1, 10:25 PM CDT	Severe Thunderstorm Warning	OUN	Grant	20 min
May 1, 10:38 PM CDT	Severe Thunderstorm Warning	OUN	Garfield, Grant, Kay, Noble	37 min
May 1, 11:25 PM CDT	Severe Thunderstorm Warning	OUN	Kingfisher, Logan	35 min
May 1, 11:33 PM CDT	Severe Thunderstorm Warning	OUN	Garfield, Noble	27 min
May 1, 11:57 PM CDT	Severe Thunderstorm Warning	OUN	Kay, Noble, Payne	48 min
May 2, 12:02 AM CDT	Severe Thunderstorm Warning	OUN	Canadian, Cleveland, Grady, Oklahoma	28 min
May 2, 12:20 AM CDT	Severe Thunderstorm Warning	OUN	Noble, Payne	40 min
May 2, 12:26 AM CDT	Severe Thunderstorm Warning	OUN	Canadian, Cleveland, Grady, Logan, McClain, Oklahoma and 1 more	34 min
May 2, 12:26 AM CDT	Severe Thunderstorm Warning	TSA	Osage, Pawnee	64 min
May 2, 12:43 AM CDT	Severe Thunderstorm Warning	OUN	Cleveland, Grady, McClain	47 min
May 2, 12:52 AM CDT	Severe Thunderstorm Warning	OUN	Lincoln, Logan, Oklahoma, Payne	38 min
May 2, 1:00 AM CDT	Severe Thunderstorm Warning	OUN	Pottawatomie, Seminole	30 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

Lamont, OK (KLMN), launched 12:00Z, 11.3 hours before the alert went out and 96 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: 1630 J/kg
Mixed-layer CIN: -463 J/kg
Mixed-layer LCL: 1041 m above ground
0-6 km bulk shear: 27 kt
0-1 km storm-relative helicity: 485 m²/s²
0-3 km storm-relative helicity: 534 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 1, 4:02 PM CDT	Mesoscale Discussion	SPC	Cleveland, Garvin, Kay, Lincoln, Logan, McClain and 6 more	88 min
May 1, 4:56 PM CDT	Mesoscale Discussion	SPC	Kay	94 min

Nearby

Tornado Watches in Oklahoma, 2008 Every tornado watch in 2008

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.