Alert archive / Oklahoma / Severe Thunderstorm Watches in 2018

Severe Thunderstorm Watch 202

June 22, 201844 counties in Oklahoma

The Storm Prediction Center issued this severe thunderstorm watch at Jun 22, 2018, 9:27 PM CDT for 44 counties in Oklahoma. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued
Jun 22, 2018, 9:27 PM CDT (02:27 UTC)
Expired
Jun 23, 2018, 3:43 AM CDT
In force
6 hr
Issued by
the Storm Prediction Center
Largest hail expected
1.5 in
Strongest gust expected
65 kt
All 44 counties

Atoka County, OK, Bryan County, OK, Carter County, OK, Choctaw County, OK, Cleveland County, OK, Coal County, OK, Comanche County, OK, Cotton County, OK, Creek County, OK, Garvin County, OK, Grady County, OK, Haskell County, OK, Hughes County, OK, Jefferson County, OK, Johnston County, OK, Kay County, OK, Latimer County, OK, Lincoln County, OK, Logan County, OK, Love County, OK, Marshall County, OK, McClain County, OK, McIntosh County, OK, Murray County, OK, Muskogee County, OK, Noble County, OK, Nowata County, OK, Okfuskee County, OK, Oklahoma County, OK, Okmulgee County, OK, Osage County, OK, Pawnee County, OK, Payne County, OK, Pittsburg County, OK, Pontotoc County, OK, Pottawatomie County, OK, Pushmataha County, OK, Rogers County, OK, Seminole County, OK, Stephens County, OK, Tillman County, OK, Tulsa County, OK, Wagoner County, OK, Washington County, OK

The radar

The Tulsa radar (KINX), 89 km from the middle of the area, began a volume at 02:30 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
5%
Ten or more severe wind reports
70%
One or more gusts of 65 knots or more
40%
Ten or more severe hail reports
20%
One or more hailstones of 2 inches or more
10%
Six or more combined severe hail and wind reports
80%

Warnings issued inside it

16 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.

IssuedProductOfficeCountiesLasted
Jun 22, 9:39 PM CDTSevere Thunderstorm WarningOUNAlfalfa, Blaine, Dewey, Garfield, Grant, Kay and 5 more51 min
Jun 22, 10:23 PM CDTSevere Thunderstorm WarningOUNBlaine, Caddo, Canadian, Cleveland, Garfield, Grady and 8 more52 min
Jun 22, 10:39 PM CDTSevere Thunderstorm WarningTSACreek, Osage, Pawnee51 min
Jun 22, 10:42 PM CDTSevere Thunderstorm WarningOUNBeckham, Caddo, Comanche, Custer, Greer, Kiowa and 2 more48 min
Jun 22, 11:06 PM CDTSevere Thunderstorm WarningOUNCaddo, Canadian, Cleveland, Garvin, Grady, Kingfisher and 7 more39 min
Jun 22, 11:20 PM CDTSevere Thunderstorm WarningTSACreek, Okfuskee, Okmulgee55 min
Jun 22, 11:25 PM CDTSevere Thunderstorm WarningTSACreek, Osage, Pawnee, Rogers, Tulsa, Washington65 min
Jun 22, 11:28 PM CDTSevere Thunderstorm WarningOUNBeckham, Caddo, Comanche, Custer, Grady, Greer and 6 more47 min
Jun 22, 11:44 PM CDTSevere Thunderstorm WarningOUNCarter, Cleveland, Garvin, Grady, Hughes, McClain and 5 more46 min
Jun 22, 11:51 PM CDTSevere Thunderstorm WarningOUNBeckham, Caddo, Carter, Comanche, Cotton, Custer and 8 more39 min
Jun 23, 12:25 AM CDTSevere Thunderstorm WarningOUNCaddo, Canadian, Comanche, Custer, Grady, Kiowa and 1 more50 min
Jun 23, 12:28 AM CDTSevere Thunderstorm WarningOUNAtoka, Bryan, Carter, Coal, Garvin, Hughes and 8 more62 min
Jun 23, 1:10 AM CDTSevere Thunderstorm WarningTSAPittsburg50 min
Jun 23, 1:22 AM CDTSevere Thunderstorm WarningOUNCarter, Garvin, Grady, McClain, Stephens41 min
Jun 23, 1:28 AM CDTSevere Thunderstorm WarningOUNAtoka, Bryan, Coal, Hughes, Johnston62 min
Jun 23, 1:50 AM CDTSevere Thunderstorm WarningTSALatimer, Pittsburg, Pushmataha40 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, 2.5 hours before the alert went out and 108 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.

Skew-T log-pSkew-T log-p diagram, Norman, OK at 00:00Z on 2018-06-23Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 495 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Norman, OK at 00:00Z on 2018-06-23The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 22 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
495 J/kg
Mixed-layer CIN
-405 J/kg
Mixed-layer LCL
1761 m above ground
0-6 km bulk shear
39 kt
0-1 km storm-relative helicity
22 m²/s²
0-3 km storm-relative helicity
293 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jun 22, 7:12 PM CDTMesoscale DiscussionSPCAlfalfa, Beaver, Beckham, Blaine, Caddo, Canadian and 22 more2 hr
Jun 22, 9:07 PM CDTMesoscale DiscussionSPCAlfalfa, Beckham, Blaine, Caddo, Canadian, Cleveland and 38 more113 min
Jun 22, 11:09 PM CDTMesoscale DiscussionSPCAtoka, Blaine, Bryan, Caddo, Canadian, Carter and 44 more2 hr
Jun 22, 11:48 PM CDTSevere Thunderstorm WatchSPCAdair, Cherokee, LeFlore, McCurtain, Mayes, Sequoyah7 hr
Jun 23, 1:01 AM CDTMesoscale DiscussionSPCAtoka, Blaine, Bryan, Caddo, Canadian, Carter and 44 more59 min
Jun 23, 2:17 PM CDTMesoscale DiscussionSPCBeckham, Caddo, Canadian, Carter, Cleveland, Comanche and 20 more118 min
Jun 23, 2:36 PM CDTMesoscale DiscussionSPCCimarron114 min
Jun 23, 3:20 PM CDTSevere Thunderstorm WatchSPCCimarron7 hr
Jun 23, 3:56 PM CDTSevere Thunderstorm WatchSPCBeckham, Blaine, Caddo, Canadian, Carter, Cleveland and 24 more6 hr
Jun 23, 6:37 PM CDTMesoscale DiscussionSPCCimarron, Texas113 min

Nearby

Severe Thunderstorm Watches in Oklahoma, 2018Every severe thunderstorm watch in 2018

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.