Alert archive / Oklahoma / Severe Thunderstorm Watches in 2018

Severe Thunderstorm Watch 217

June 25, 20186 counties in Kansas; 33 counties in Oklahoma

The Storm Prediction Center issued this severe thunderstorm watch at Jun 25, 2018, 12:31 AM CDT for 6 counties in Kansas; 33 counties in Oklahoma. It was in force for 5 hr.

The area

The outline as issued.

The facts

Issued
Jun 25, 2018, 12:31 AM CDT (05:31 UTC)
Expired
Jun 25, 2018, 5:46 AM CDT
In force
5 hr
Issued by
the Storm Prediction Center
Largest hail expected
1.5 in
Strongest gust expected
60 kt
All 39 counties

Chautauqua County, KS, Cowley County, KS, Elk County, KS, Harper County, KS, Montgomery County, KS, Sumner County, KS, Atoka County, OK, Cherokee County, OK, Cleveland County, OK, Coal County, OK, Creek County, OK, Garvin County, OK, Grady County, OK, Hughes County, OK, Johnston County, OK, Kay County, OK, Lincoln County, OK, Logan County, OK, Mayes 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, Rogers County, OK, Seminole County, OK, Tulsa County, OK, Wagoner County, OK, Washington County, OK

The radar

The Tulsa radar (KINX), 69 km from the middle of the area, began a volume at 05:34 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
70%
One or more gusts of 65 knots or more
20%
Ten or more severe hail reports
10%
One or more hailstones of 2 inches or more
10%
Six or more combined severe hail and wind reports
90%

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
Jun 25, 12:41 AM CDTSevere Thunderstorm WarningOUNAlfalfa, Blaine, Caddo, Canadian, Custer, Dewey and 6 more49 min
Jun 25, 1:24 AM CDTSevere Thunderstorm WarningOUNBlaine, Caddo, Canadian, Cleveland, Garfield, Grady and 8 more51 min
Jun 25, 1:56 AM CDTSevere Thunderstorm WarningOUNBeckham, Blaine, Caddo, Comanche, Cotton, Custer and 8 more49 min
Jun 25, 2:05 AM CDTSevere Thunderstorm WarningOUNBlaine, Caddo, Canadian, Cleveland, Garfield, Garvin and 12 more40 min
Jun 25, 2:11 AM CDTSevere Thunderstorm WarningTSAOsage, Pawnee64 min
Jun 25, 2:44 AM CDTSevere Thunderstorm WarningOUNCaddo, Canadian, Cleveland, Garvin, Grady, Lincoln and 7 more46 min
Jun 25, 2:47 AM CDTSevere Thunderstorm WarningICTChautauqua, Cowley, Elk73 min
Jun 25, 2:47 AM CDTSevere Thunderstorm WarningOUNCaddo, Comanche, Cotton, Grady, Greer, Harmon and 6 more43 min
Jun 25, 3:01 AM CDTSevere Thunderstorm WarningTSACreek, Osage, Pawnee59 min
Jun 25, 3:29 AM CDTSevere Thunderstorm WarningOUNCleveland, Lincoln, Oklahoma, Pottawatomie, Seminole46 min
Jun 25, 3:41 AM CDTSevere Thunderstorm WarningOUNCleveland, Garvin, McClain, Murray, Pontotoc, Pottawatomie and 1 more49 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, 5.5 hours before the alert went out and 162 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 2018-06-25Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 218 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 2018-06-25The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 74 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
218 J/kg
Mixed-layer CIN
-476 J/kg
Mixed-layer LCL
2275 m above ground
0-6 km bulk shear
53 kt
0-1 km storm-relative helicity
74 m²/s²
0-3 km storm-relative helicity
192 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.1

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jun 24, 7:06 PM CDTMesoscale DiscussionSPCClark, Finney, Ford, Grant, Gray, Haskell and 8 more84 min
Jun 24, 7:51 PM CDTMesoscale DiscussionSPCEllis, Jewell, Osborne, Phillips, Rooks, Smith84 min
Jun 24, 8:50 PM CDTSevere Thunderstorm WatchSPCClark, Ford, Hodgeman, Meade7 hr
Jun 24, 9:49 PM CDTMesoscale DiscussionSPCBarber, Clark, Comanche, Kiowa, Pratt86 min
Jun 24, 10:08 PM CDTSevere Thunderstorm WatchSPCBarber, Comanche, Kiowa, Pratt6 hr
Jun 24, 11:53 PM CDTMesoscale DiscussionSPCBarber, Harper, Kingman, Sedgwick, Sumner67 min
Jun 25, 3:34 AM CDTMesoscale DiscussionSPCChautauqua, Cherokee, Elk, Labette, Montgomery, Wilson86 min

Nearby

Severe Thunderstorm Watches in Oklahoma, 2018Severe Thunderstorm Watches in Kansas, 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.