Alert archive / Oklahoma / Severe Thunderstorm Watches in 2017
Severe Thunderstorm Watch 351
The Storm Prediction Center issued this severe thunderstorm watch at Jun 18, 2017, 4:14 AM CDT for 26 counties in Oklahoma. It was in force for 6 hr.
The area
The outline as issued.
The facts
- Issued
- Jun 18, 2017, 4:14 AM CDT (09:14 UTC)
- Expired
- Jun 18, 2017, 10:23 AM CDT
- In force
- 6 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 2 in
- Strongest gust expected
- 65 kt
All 26 counties
Adair County, OK, Atoka County, OK, Cherokee County, OK, Cleveland County, OK, Coal County, OK, Creek County, OK, Haskell County, OK, Hughes County, OK, Johnston County, OK, Latimer County, OK, LeFlore County, OK, Lincoln County, OK, Logan County, OK, McIntosh County, OK, Muskogee County, OK, Okfuskee County, OK, Oklahoma County, OK, Okmulgee County, OK, Payne County, OK, Pittsburg County, OK, Pontotoc County, OK, Pottawatomie County, OK, Pushmataha County, OK, Seminole County, OK, Sequoyah County, OK, Wagoner County, OK
The radar
The Norman radar (KTLX), 71 km from the middle of the area, began a volume at 09:14 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
- 5%
- One or more EF2 to EF5 tornadoes
- 2%
- Ten or more severe wind reports
- 30%
- One or more gusts of 65 knots or more
- 30%
- Ten or more severe hail reports
- 30%
- One or more hailstones of 2 inches or more
- 30%
- Six or more combined severe hail and wind reports
- 60%
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 |
|---|---|---|---|---|
| Jun 18, 4:59 AM CDT | Severe Thunderstorm Warning | OUN | Lincoln | 46 min |
| Jun 18, 6:11 AM CDT | Severe Thunderstorm Warning | OUN | Lincoln, Logan | 49 min |
| Jun 18, 6:43 AM CDT | Severe Thunderstorm Warning | TSA | Creek, Pawnee | 25 min |
| Jun 18, 7:12 AM CDT | Severe Thunderstorm Warning | TSA | Cherokee, Mayes, Muskogee, Rogers, Wagoner | 63 min |
| Jun 18, 8:02 AM CDT | Severe Thunderstorm Warning | TSA | Adair, Cherokee, Sequoyah | 43 min |
| Jun 18, 8:38 AM CDT | Severe Thunderstorm Warning | TSA | LeFlore, Sequoyah | 37 min |
| Jun 18, 9:08 AM CDT | Severe Thunderstorm Warning | TSA | Latimer, LeFlore, Pushmataha | 67 min |
| Jun 18, 9:14 AM CDT | Severe Thunderstorm Warning | TSA | LeFlore | 46 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, 9.2 hours before the alert went out and 83 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
- 3025 J/kg
- Mixed-layer CIN
- -400 J/kg
- Mixed-layer LCL
- 1479 m above ground
- 0-6 km bulk shear
- 42 kt
- 0-1 km storm-relative helicity
- 67 m²/s²
- 0-3 km storm-relative helicity
- 243 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.1
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 17, 8:23 PM CDT | Mesoscale Discussion | SPC | Alfalfa, Beaver, Grant, Harper, Kay, Woods | 2 hr |
| Jun 17, 9:33 PM CDT | Severe Thunderstorm Watch | SPC | Alfalfa, Garfield, Grant, Harper, Kay, Lincoln and 6 more | 7 hr |
| Jun 17, 9:34 PM CDT | Mesoscale Discussion | SPC | Craig, Delaware, Kay, Mayes, Nowata, Osage and 5 more | 116 min |
| Jun 17, 10:18 PM CDT | Severe Thunderstorm Watch | SPC | Craig, Creek, Nowata, Osage, Ottawa, Pawnee and 3 more | 6 hr |
| Jun 17, 11:55 PM CDT | Mesoscale Discussion | SPC | Alfalfa, Craig, Creek, Delaware, Garfield, Grant and 12 more | 95 min |
| Jun 18, 3:44 AM CDT | Mesoscale Discussion | SPC | Cleveland, Coal, Creek, Garfield, Hughes, Kingfisher and 14 more | 2 hr |
| Jun 18, 7:18 AM CDT | Mesoscale Discussion | SPC | Adair, Atoka, Cherokee, Coal, Creek, Haskell and 14 more | 117 min |
Nearby
Severe Thunderstorm Watches in Oklahoma, 2017Every severe thunderstorm watch in 2017
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.