Alert archive / Oklahoma / Severe Thunderstorm Watches in 2015
Severe Thunderstorm Watch 63
The Storm Prediction Center issued this severe thunderstorm watch at Apr 16, 2015, 4:59 PM CDT for 15 counties in Oklahoma. It was in force for 7 hr.
The area
The outline as issued.
The facts
- Issued
- Apr 16, 2015, 4:59 PM CDT (21:59 UTC)
- Expired
- Apr 17, 2015, 12:00 AM CDT
- In force
- 7 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 2 in
- Strongest gust expected
- 60 kt
Counties Alfalfa County, OK, Beckham County, OK, Blaine County, OK, Caddo County, OK, Custer County, OK, Dewey County, OK, Ellis County, OK, Garfield County, OK, Grant County, OK, Harper County, OK, Major County, OK, Roger Mills County, OK, Washita County, OK, Woods County, OK, Woodward County, OK
The radar
The Vance AFB radar (KVNX), 124 km from the middle of the area, began a volume at 22:01 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
- 10%
- One or more EF2 to EF5 tornadoes
- 2%
- Ten or more severe wind reports
- 20%
- 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
15 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 16, 5:08 PM CDT | Severe Thunderstorm Warning | OUN | Woods | 52 min |
| Apr 16, 5:47 PM CDT | Severe Thunderstorm Warning | OUN | Woods, Woodward | 43 min |
| Apr 16, 6:22 PM CDT | Severe Thunderstorm Warning | OUN | Woods, Woodward | 68 min |
| Apr 16, 6:25 PM CDT | Severe Thunderstorm Warning | OUN | Beckham, Greer, Roger Mills | 50 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, 8:03 PM CDT | Flash Flood Warning | OUN | Woods, Woodward | 3 hr |
| Apr 16, 8:35 PM CDT | Tornado Warning | OUN | Roger Mills | 40 min |
| Apr 16, 8:58 PM CDT | Severe Thunderstorm Warning | OUN | Alfalfa | 47 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 |
| Apr 16, 10:44 PM CDT | Severe Thunderstorm Warning | OUN | Dewey | 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
Dodge City, (KDDC), launched 12:00Z, 10.0 hours before the alert went out and 180 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
- 283 J/kg
- Mixed-layer CIN
- -151 J/kg
- Mixed-layer LCL
- 1583 m above ground
- 0-6 km bulk shear
- 37 kt
- 0-1 km storm-relative helicity
- 146 m²/s²
- 0-3 km storm-relative helicity
- 169 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 1.3
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, 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 |
| Apr 16, 6:09 PM CDT | Tornado Watch | SPC | Beckham, Ellis, Greer, Harmon, Roger Mills | 6 hr |
Nearby
Severe Thunderstorm Watches in Oklahoma, 2015Every severe thunderstorm 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.