Alert archive / Oklahoma / Severe Thunderstorm Watches in 2016
Severe Thunderstorm Watch 83
The Storm Prediction Center issued this severe thunderstorm watch at Apr 11, 2016, 12:57 AM CDT for Crawford County, Sebastian County, Washington County, Arkansas; 16 counties in Oklahoma. It was in force for 4 hr.
The area
The outline as issued.
The facts
- Issued
- Apr 11, 2016, 12:57 AM CDT (05:57 UTC)
- Expired
- Apr 11, 2016, 4:45 AM CDT
- In force
- 4 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 1 in
- Strongest gust expected
- 60 kt
Counties Crawford County, AR, Sebastian County, AR, Washington County, AR, Adair County, OK, Cherokee County, OK, Choctaw County, OK, Creek County, OK, Haskell County, OK, Latimer County, OK, LeFlore County, OK, McIntosh County, OK, Muskogee County, OK, Okfuskee County, OK, Okmulgee County, OK, Pittsburg County, OK, Pushmataha County, OK, Sequoyah County, OK, Tulsa County, OK, Wagoner County, OK
The radar
The Tulsa radar (KINX), 109 km from the middle of the area, began a volume at 05:56 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
- 2%
- Ten or more severe wind reports
- 40%
- One or more gusts of 65 knots or more
- 10%
- 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
3 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 11, 1:34 AM CDT | Severe Thunderstorm Warning | TSA | Creek | 26 min |
| Apr 11, 1:47 AM CDT | Severe Thunderstorm Warning | TSA | Creek, Pawnee | 28 min |
| Apr 11, 2:02 AM CDT | Severe Thunderstorm Warning | TSA | Creek, Osage, Tulsa | 43 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
Norman, OK (KOUN), launched 00:00Z, 6.0 hours before the alert went out and 158 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
- 2443 J/kg
- Mixed-layer CIN
- -43 J/kg
- Mixed-layer LCL
- 1418 m above ground
- 0-6 km bulk shear
- 30 kt
- 0-1 km storm-relative helicity
- 166 m²/s²
- 0-3 km storm-relative helicity
- 243 m²/s²
- Significant tornado parameter
- 1.2
- Supercell composite
- 13.4
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 11, 11:48 AM CDT | Mesoscale Discussion | SPC | Arkansas, Ashley, Bradley, Calhoun, Chicot, Clark and 15 more | 2 hr |
| Apr 11, 1:05 PM CDT | Severe Thunderstorm Watch | SPC | Ashley, Bradley, Calhoun, Chicot, Columbia, Desha and 5 more | 6 hr |
| Apr 11, 1:38 PM CDT | Severe Thunderstorm Watch | SPC | Hempstead, Howard, Little River, Miller, Polk, Sevier | 9 hr |
| Apr 11, 3:42 PM CDT | Mesoscale Discussion | SPC | Ashley, Bradley, Chicot, Columbia, Drew, Union | 93 min |
| Apr 11, 6:09 PM CDT | Mesoscale Discussion | SPC | Ashley, Bradley, Calhoun, Chicot, Columbia, Drew and 2 more | 66 min |
| Apr 10, 7:36 PM CDT | Mesoscale Discussion | SPC | Blaine, Caddo, Canadian, Carter, Cleveland, Coal and 23 more | 114 min |
| Apr 10, 8:42 PM CDT | Mesoscale Discussion | SPC | Craig, Kay, Nowata, Osage, Ottawa, Rogers and 1 more | 2 hr |
| Apr 10, 9:31 PM CDT | Mesoscale Discussion | SPC | Beckham, Caddo, Canadian, Carter, Cleveland, Comanche and 17 more | 59 min |
| Apr 10, 9:52 PM CDT | Severe Thunderstorm Watch | SPC | Atoka, Bryan, Caddo, Canadian, Carter, Cleveland and 24 more | 6 hr |
| Apr 10, 11:23 PM CDT | Mesoscale Discussion | SPC | Craig, Nowata, Osage, Ottawa, Rogers, Washington | 37 min |
| Apr 11, 12:21 AM CDT | Mesoscale Discussion | SPC | Carter, Cleveland, Coal, Garvin, Hughes, Jefferson and 10 more | 54 min |
| Apr 11, 6:15 AM CDT | Mesoscale Discussion | SPC | Bryan, Carter, Choctaw, Jefferson, Johnston, Love and 1 more | 3 hr |
| Apr 11, 12:39 PM CDT | Mesoscale Discussion | SPC | Carter, Jefferson, Love, Marshall | 2 hr |
Nearby
Severe Thunderstorm Watches in Oklahoma, 2016Severe Thunderstorm Watches in Arkansas, 2016Every severe thunderstorm watch in 2016
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.