Alert archive / Oklahoma / Tornado Watches in 2009
Tornado Watch 714
The Storm Prediction Center issued this tornado watch at Aug 19, 2009, 4:02 PM CDT for 6 counties in Kansas; 23 counties in Oklahoma. It was in force for 7 hr.
The area
The outline as issued.
The facts
- Issued
- Aug 19, 2009, 4:02 PM CDT (21:02 UTC)
- Expired
- Aug 19, 2009, 11:00 PM CDT
- In force
- 7 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 2.5 in
- Strongest gust expected
- 60 kt
All 29 counties
Barber County, KS, Chautauqua County, KS, Comanche County, KS, Cowley County, KS, Harper County, KS, Sumner County, KS, Alfalfa County, OK, Blaine County, OK, Canadian County, OK, Creek County, OK, Custer County, OK, Dewey County, OK, Ellis County, OK, Garfield County, OK, Grant County, OK, Harper County, OK, Kay County, OK, Kingfisher County, OK, Lincoln County, OK, Logan County, OK, Major County, OK, Noble County, OK, Okfuskee County, OK, Oklahoma County, OK, Osage County, OK, Pawnee County, OK, Payne County, OK, Woods County, OK, Woodward County, OK
The radar
The Vance AFB radar (KVNX), 10 km from the middle of the area, began a volume at 21:03 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
- 50%
- One or more EF2 to EF5 tornadoes
- 20%
- Ten or more severe wind reports
- 50%
- One or more gusts of 65 knots or more
- 30%
- Ten or more severe hail reports
- 60%
- One or more hailstones of 2 inches or more
- 50%
- Six or more combined severe hail and wind reports
- 80%
Warnings issued inside it
8 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 19, 6:49 PM CDT | Severe Thunderstorm Warning | ICT | Butler, Cowley | 56 min |
| Aug 19, 7:35 PM CDT | Severe Thunderstorm Warning | ICT | Chautauqua, Cowley, Elk | 55 min |
| Aug 19, 8:09 PM CDT | Severe Thunderstorm Warning | ICT | Chautauqua, Montgomery | 66 min |
| Aug 19, 8:14 PM CDT | Tornado Warning | ICT | Chautauqua, Elk, Montgomery, Wilson | 34 min |
| Aug 19, 8:17 PM CDT | Severe Thunderstorm Warning | OUN | Ellis, Harper, Woods, Woodward | 58 min |
| Aug 19, 8:24 PM CDT | Severe Thunderstorm Warning | ICT | Chautauqua, Montgomery | 66 min |
| Aug 19, 9:05 PM CDT | Severe Thunderstorm Warning | OUN | Harper, Major, Woods, Woodward | 55 min |
| Aug 19, 9:54 PM CDT | Severe Thunderstorm Warning | OUN | Dewey, Major, Woodward | 25 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, 9.0 hours before the alert went out and 59 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1952 m above ground
- 0-6 km bulk shear
- 29 kt
- 0-1 km storm-relative helicity
- 37 m²/s²
- 0-3 km storm-relative helicity
- 103 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 |
|---|---|---|---|---|
| Aug 18, 8:41 PM CDT | Mesoscale Discussion | SPC | Cheyenne, Decatur, Finney, Gove, Grant, Gray and 17 more | 64 min |
| Aug 19, 2:46 PM CDT | Mesoscale Discussion | SPC | Barton, Cloud, Edwards, Ellis, Ellsworth, Finney and 18 more | 119 min |
| Aug 19, 6:51 PM CDT | Mesoscale Discussion | SPC | Atchison, Brown, Clay, Dickinson, Ellsworth, Geary and 13 more | 54 min |
| Aug 18, 11:54 PM CDT | Severe Thunderstorm Watch | SPC | Beckham, Blaine, Caddo, Canadian, Carter, Cleveland and 22 more | 3 hr |
| Aug 19, 1:24 AM CDT | Mesoscale Discussion | SPC | Blaine, Caddo, Canadian, Carter, Cleveland, Comanche and 18 more | 96 min |
| Aug 19, 2:40 PM CDT | Mesoscale Discussion | SPC | Alfalfa, Blaine, Caddo, Canadian, Custer, Dewey and 12 more | 95 min |
Nearby
Tornado Watches in Oklahoma, 2009Tornado Watches in Kansas, 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.