Alert archive / Oklahoma / Tornado Watches in 2015
Tornado Watch 64
The Storm Prediction Center issued this tornado watch at Apr 16, 2015, 6:09 PM CDT for 5 counties in Oklahoma. It was in force for 6 hr.
The area
The outline as issued.
The facts
- Issued
- Apr 16, 2015, 6:09 PM CDT (23:09 UTC)
- Expired
- Apr 16, 2015, 11:59 PM CDT
- In force
- 6 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 2 in
- Strongest gust expected
- 60 kt
Counties Beckham County, OK, Ellis County, OK, Greer County, OK, Harmon County, OK, Roger Mills County, OK
The radar
The Altus AFB radar (KFDR), 174 km from the middle of the area, began a volume at 23:10 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
- 30%
- One or more EF2 to EF5 tornadoes
- 10%
- Ten or more severe wind reports
- 30%
- One or more gusts of 65 knots or more
- 10%
- Ten or more severe hail reports
- 40%
- One or more hailstones of 2 inches or more
- 30%
- Six or more combined severe hail and wind reports
- 70%
Warnings issued inside it
10 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 16, 6:25 PM CDT | Severe Thunderstorm Warning | OUN | Beckham, Greer, Roger Mills | 50 min |
| Apr 16, 6:31 PM CDT | Severe Thunderstorm Warning | OUN | Greer, Harmon | 44 min |
| Apr 16, 6:42 PM CDT | Severe Thunderstorm Warning | OUN | Ellis, Roger Mills | 63 min |
| Apr 16, 6:48 PM CDT | Tornado Warning | OUN | Roger Mills | 42 min |
| Apr 16, 7:32 PM CDT | Severe Thunderstorm Warning | OUN | Beckham, Greer | 43 min |
| Apr 16, 7:42 PM CDT | Severe Thunderstorm Warning | OUN | Beckham, Custer, Ellis, Roger Mills, Woodward | 63 min |
| Apr 16, 8:01 PM CDT | Tornado Warning | OUN | Beckham | 29 min |
| Apr 16, 8:35 PM CDT | Tornado Warning | OUN | Roger Mills | 40 min |
| Apr 16, 9:11 PM CDT | Tornado Warning | OUN | Beckham, Roger Mills | 49 min |
| Apr 16, 9:57 PM CDT | Severe Thunderstorm Warning | OUN | Beckham, Custer, Dewey, Ellis, Roger Mills | 48 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
Amarillo Airport, TX (KAMA), launched 12:00Z, 11.2 hours before the alert went out and 176 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
- 246 J/kg
- Mixed-layer CIN
- -181 J/kg
- Mixed-layer LCL
- 2122 m above ground
- 0-6 km bulk shear
- 29 kt
- 0-1 km storm-relative helicity
- 160 m²/s²
- 0-3 km storm-relative helicity
- 172 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.2
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 16, 12:17 PM CDT | Mesoscale Discussion | SPC | Beaver, Harper | 118 min |
| Apr 16, 1:48 PM CDT | Tornado Watch | SPC | Beaver, Texas | 8 hr |
| Apr 16, 2:42 PM CDT | Mesoscale Discussion | SPC | Love | 63 min |
| Apr 16, 4:06 PM CDT | Mesoscale Discussion | SPC | Jackson | 2 hr |
| Apr 16, 4:40 PM CDT | Severe Thunderstorm Watch | SPC | Comanche, Cotton, Greer, Harmon, Jackson, Kiowa and 1 more | 7 hr |
| Apr 16, 4:44 PM CDT | Mesoscale Discussion | SPC | Beckham, Blaine, Custer, Dewey, Ellis, Greer and 7 more | 3 hr |
| Apr 16, 4:59 PM CDT | Severe Thunderstorm Watch | SPC | Alfalfa, Beckham, Blaine, Caddo, Custer, Dewey and 9 more | 7 hr |
| Apr 16, 5:06 PM CDT | Mesoscale Discussion | SPC | Beaver, Texas | 84 min |
| Apr 16, 5:29 PM CDT | Mesoscale Discussion | SPC | Cimarron | 91 min |
| Apr 16, 5:41 PM CDT | Mesoscale Discussion | SPC | Beckham, Roger Mills | 94 min |
Nearby
Tornado Watches in Oklahoma, 2015Every tornado watch in 2015
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.