Alert archive / Oklahoma / Tornado Watches in 2009
Tornado Watch 56
The Storm Prediction Center issued this tornado watch at Mar 23, 2009, 5:19 PM CDT for 30 counties in Oklahoma. It was in force for 7 hr.
The area
The outline as issued.
The facts
- Issued
- Mar 23, 2009, 5:19 PM CDT (22:19 UTC)
- Expired
- Mar 24, 2009, 12:00 AM CDT
- In force
- 7 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 1.5 in
- Strongest gust expected
- 60 kt
All 30 counties
Blaine County, OK, Caddo County, OK, Canadian County, OK, Cleveland County, OK, Comanche County, OK, Cotton County, OK, Creek County, OK, Garfield County, OK, Garvin County, OK, Grady County, OK, Grant County, OK, Jackson County, OK, Kay County, OK, Kingfisher County, OK, Kiowa County, OK, Lincoln County, OK, Logan County, OK, McClain County, OK, Noble County, OK, Oklahoma County, OK, Osage County, OK, Pawnee County, OK, Payne County, OK, Pottawatomie County, OK, Rogers County, OK, Stephens County, OK, Tillman County, OK, Tulsa County, OK, Washington County, OK, Washita County, OK
The radar
The Norman radar (KTLX), 74 km from the middle of the area, began a volume at 22:19 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
- 40%
- One or more hailstones of 2 inches or more
- 20%
- Six or more combined severe hail and wind reports
- 70%
Warnings issued inside it
24 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 23, 5:42 PM CDT | Severe Thunderstorm Warning | OUN | Kingfisher | 48 min |
| Mar 23, 6:27 PM CDT | Severe Thunderstorm Warning | OUN | Kingfisher, Logan | 48 min |
| Mar 23, 6:40 PM CDT | Tornado Warning | OUN | Logan | 35 min |
| Mar 23, 6:47 PM CDT | Severe Thunderstorm Warning | OUN | Harmon, Jackson | 43 min |
| Mar 23, 6:51 PM CDT | Severe Thunderstorm Warning | OUN | Comanche, Kiowa, Tillman | 39 min |
| Mar 23, 7:10 PM CDT | Severe Thunderstorm Warning | OUN | Jackson, Kiowa, Tillman | 50 min |
| Mar 23, 7:10 PM CDT | Severe Thunderstorm Warning | OUN | Noble, Payne | 50 min |
| Mar 23, 7:26 PM CDT | Severe Thunderstorm Warning | OUN | Comanche | 64 min |
| Mar 23, 7:37 PM CDT | Severe Thunderstorm Warning | TSA | Creek, Osage, Pawnee | 53 min |
| Mar 23, 7:52 PM CDT | Severe Thunderstorm Warning | OUN | Comanche, Kiowa, Tillman | 38 min |
| Mar 23, 7:56 PM CDT | Severe Thunderstorm Warning | OUN | Payne | 24 min |
| Mar 23, 8:01 PM CDT | Severe Thunderstorm Warning | OUN | Canadian, Kingfisher, Logan, Oklahoma | 44 min |
| Mar 23, 8:26 PM CDT | Severe Thunderstorm Warning | OUN | Caddo, Comanche, Grady, Stephens | 49 min |
| Mar 23, 8:28 PM CDT | Severe Thunderstorm Warning | TSA | Creek, Osage, Pawnee, Tulsa | 51 min |
| Mar 23, 8:47 PM CDT | Severe Thunderstorm Warning | OUN | Kiowa | 43 min |
| Mar 23, 9:12 PM CDT | Severe Thunderstorm Warning | OUN | Grady, Stephens | 48 min |
| Mar 23, 9:23 PM CDT | Severe Thunderstorm Warning | OUN | Caddo, Kiowa, Washita | 52 min |
| Mar 23, 9:24 PM CDT | Severe Thunderstorm Warning | TSA | Osage | 21 min |
| Mar 23, 10:16 PM CDT | Severe Thunderstorm Warning | OUN | Caddo, Grady | 59 min |
| Mar 23, 10:29 PM CDT | Severe Thunderstorm Warning | OUN | Washita | 46 min |
| Mar 23, 10:52 PM CDT | Severe Thunderstorm Warning | OUN | Caddo, Canadian | 38 min |
| Mar 23, 11:03 PM CDT | Severe Thunderstorm Warning | OUN | Cleveland, McClain | 57 min |
| Mar 23, 11:23 PM CDT | Severe Thunderstorm Warning | OUN | Caddo, Canadian, Grady | 52 min |
| Mar 23, 11:53 PM CDT | Severe Thunderstorm Warning | OUN | Pottawatomie | 31 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, 10.3 hours before the alert went out and 84 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.
- Mixed-layer CAPE
- 26 J/kg
- Mixed-layer CIN
- -604 J/kg
- Mixed-layer LCL
- 848 m above ground
- 0-6 km bulk shear
- 40 kt
- 0-1 km storm-relative helicity
- 422 m²/s²
- 0-3 km storm-relative helicity
- 606 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 23, 12:39 PM CDT | Mesoscale Discussion | SPC | Alfalfa, Blaine, Garfield, Grant, Kay, Major | 96 min |
| Mar 23, 1:03 PM CDT | Tornado Watch | SPC | Alfalfa, Garfield, Grant, Kay, Major, Noble and 1 more | 6 hr |
| Mar 23, 3:11 PM CDT | Mesoscale Discussion | SPC | Alfalfa, Garfield, Grant, Kay, Noble, Osage and 2 more | 94 min |
| Mar 23, 5:08 PM CDT | Mesoscale Discussion | SPC | Alfalfa, Blaine, Caddo, Canadian, Cleveland, Creek and 13 more | 97 min |
Nearby
Tornado Watches in Oklahoma, 2009Every tornado watch in 2009
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.