Alert archive / Oklahoma / Severe Thunderstorm Watches in 2012
Severe Thunderstorm Watch 176
The Storm Prediction Center issued this severe thunderstorm watch at Apr 15, 2012, 6:38 AM CDT for 4 states. It was in force for 4 hr.
The area
The outline as issued.
The facts
- Issued
- Apr 15, 2012, 6:38 AM CDT (11:38 UTC)
- Expired
- Apr 15, 2012, 11:00 AM CDT
- In force
- 4 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 1 in
- Strongest gust expected
- 60 kt
All 26 counties
Benton County, AR, Carroll County, AR, Crawford County, AR, Franklin County, AR, Madison County, AR, Sebastian County, AR, Washington County, AR, Cherokee County, KS, Barry County, MO, Jasper County, MO, Lawrence County, MO, McDonald County, MO, Newton County, MO, Adair County, OK, Cherokee County, OK, Craig County, OK, Delaware County, OK, Haskell County, OK, Latimer County, OK, LeFlore County, OK, Mayes County, OK, McIntosh County, OK, Muskogee County, OK, Ottawa County, OK, Pittsburg County, OK, Sequoyah County, OK
The radar
The Tulsa radar (KINX), 74 km from the middle of the area, began a volume at 11:38 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
- 20%
- One or more EF2 to EF5 tornadoes
- 5%
- Ten or more severe wind reports
- 40%
- One or more gusts of 65 knots or more
- 30%
- Ten or more severe hail reports
- 20%
- One or more hailstones of 2 inches or more
- 5%
- Six or more combined severe hail and wind reports
- 70%
Warnings issued inside it
7 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 15, 6:41 AM CDT | Severe Thunderstorm Warning | SGF | Bourbon, Cherokee, Crawford | 49 min |
| Apr 15, 7:21 AM CDT | Severe Thunderstorm Warning | SGF | Cherokee, Crawford | 39 min |
| Apr 15, 8:55 AM CDT | Flash Flood Warning | SGF | Cherokee | 6 hr |
| Apr 15, 9:13 AM CDT | Severe Thunderstorm Warning | TSA | Benton, Washington | 62 min |
| Apr 15, 9:16 AM CDT | Tornado Warning | TSA | Adair, Cherokee | 29 min |
| Apr 15, 9:42 AM CDT | Tornado Warning | TSA | Benton, Washington | 33 min |
| Apr 15, 10:13 AM CDT | Severe Thunderstorm Warning | TSA | Benton, Carroll, Washington | 24 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
Springfield, MO (KSGF), launched 00:00Z, 11.6 hours before the alert went out and 103 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
- 532 J/kg
- Mixed-layer CIN
- -182 J/kg
- Mixed-layer LCL
- 1275 m above ground
- 0-6 km bulk shear
- 51 kt
- 0-1 km storm-relative helicity
- 294 m²/s²
- 0-3 km storm-relative helicity
- 443 m²/s²
- Significant tornado parameter
- 0.1
- Supercell composite
- 3.5
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 15, 6:35 AM CDT | Mesoscale Discussion | SPC | Benton, Crawford, Madison, Sebastian, Washington | 85 min |
| Apr 15, 9:25 AM CDT | Mesoscale Discussion | SPC | Baxter, Boone, Carroll, Conway, Crawford, Franklin and 22 more | 95 min |
| Apr 15, 10:51 AM CDT | Tornado Watch | SPC | Baxter, Boone, Carroll, Conway, Crawford, Franklin and 18 more | 7 hr |
| Apr 15, 1:38 PM CDT | Mesoscale Discussion | SPC | Baxter, Boone, Carroll, Conway, Crawford, Franklin and 18 more | 97 min |
| Apr 15, 3:44 PM CDT | Mesoscale Discussion | SPC | Calhoun, Clark, Columbia, Hempstead, Lafayette, Miller and 3 more | 91 min |
| Apr 15, 4:22 PM CDT | Mesoscale Discussion | SPC | Arkansas, Bradley, Calhoun, Clay, Cleburne, Cleveland and 29 more | 83 min |
| Apr 15, 4:25 PM CDT | Tornado Watch | SPC | Arkansas, Baxter, Bradley, Calhoun, Clark, Clay and 49 more | 6 hr |
| Apr 14, 7:15 PM CDT | Mesoscale Discussion | SPC | Butler, Chase, Dickinson, Geary, Harper, Harvey and 7 more | 60 min |
| Apr 14, 10:37 PM CDT | Mesoscale Discussion | SPC | Butler, Chase, Clay, Coffey, Dickinson, Douglas and 19 more | 83 min |
| Apr 14, 11:48 PM CDT | Mesoscale Discussion | SPC | Coffey, Douglas, Franklin, Johnson, Leavenworth, Lyon and 2 more | 87 min |
| Apr 15, 1:37 AM CDT | Tornado Watch | SPC | Atchison, Brown, Butler, Chase, Chautauqua, Coffey and 26 more | 5 hr |
| Apr 15, 4:32 AM CDT | Mesoscale Discussion | SPC | Allen, Anderson, Bourbon, Chautauqua, Cherokee, Coffey and 13 more | 88 min |
| Apr 14, 11:28 PM CDT | Mesoscale Discussion | SPC | Putnam | 92 min |
| Apr 15, 4:42 PM CDT | Tornado Watch | SPC | Audrain, Boone, Butler, Callaway, Carter, Cole and 35 more | 6 hr |
| Apr 14, 10:29 PM CDT | Severe Thunderstorm Watch | SPC | Comanche, Cotton, Tillman | 6 hr |
Nearby
Severe Thunderstorm Watches in Oklahoma, 2012Severe Thunderstorm Watches in Arkansas, 2012Severe Thunderstorm Watches in Missouri, 2012Every severe thunderstorm watch in 2012
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.