Alert archive / Oklahoma / Mesoscale Discussions in 2018

Mesoscale Discussion 465

May 19, 20184 states

The Storm Prediction Center issued this mesoscale discussion at May 19, 2018, 6:11 PM CDT for 4 states. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
May 19, 2018, 6:11 PM CDT (23:11 UTC)
Expired
May 19, 2018, 8:15 PM CDT
In force
2 hr
Issued by
the Storm Prediction Center
All 83 counties

Allen County, KS, Bourbon County, KS, Chautauqua County, KS, Cherokee County, KS, Crawford County, KS, Labette County, KS, Montgomery County, KS, Neosho County, KS, Wilson County, KS, Barry County, MO, Barton County, MO, Camden County, MO, Cedar County, MO, Christian County, MO, Dade County, MO, Dallas County, MO, Douglas County, MO, Greene County, MO, Hickory County, MO, Jasper County, MO, Laclede County, MO, Lawrence County, MO, McDonald County, MO, Miller County, MO, Newton County, MO, Ozark County, MO, Polk County, MO, Pulaski County, MO, St. Clair County, MO, Stone County, MO, Taney County, MO, Texas County, MO, Vernon County, MO, Webster County, MO, Wright County, MO, Alfalfa County, OK, Beckham County, OK, Blaine County, OK, Caddo County, OK, Canadian County, OK, Comanche County, OK, Cotton County, OK, Craig County, OK, Custer County, OK, Dewey County, OK, Garfield County, OK, Grady County, OK, Grant County, OK, Greer County, OK, Harmon County, OK, Jackson County, OK, Kay County, OK, Kingfisher County, OK, Kiowa County, OK, Logan County, OK, Major County, OK, Noble County, OK, Nowata County, OK, Oklahoma County, OK, Osage County, OK, Ottawa County, OK, Pawnee County, OK, Payne County, OK, Tillman County, OK, Washington County, OK, Washita County, OK, Baylor County, TX, Cottle County, TX, Crosby County, TX, Dickens County, TX, Floyd County, TX, Foard County, TX, Garza County, TX, Hardeman County, TX, Kent County, TX, King County, TX, Knox County, TX, Lubbock County, TX, Lynn County, TX, Motley County, TX, Stonewall County, TX, Wichita County, TX, Wilbarger County, TX

The radar

The Norman radar (KTLX), 38 km from the middle of the area, began a volume at 23:13 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.

The nearest sounding before it

Norman, OK (KOUN), launched 12:00Z, 11.2 hours before the alert went out and 52 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 12:00Z on 2018-05-19Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 755 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 12:00Z on 2018-05-19The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 76 square meters per square second.19395878Sfc1 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
755 J/kg
Mixed-layer CIN
-268 J/kg
Mixed-layer LCL
1934 m above ground
0-6 km bulk shear
16 kt
0-1 km storm-relative helicity
76 m²/s²
0-3 km storm-relative helicity
121 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

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SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 18, 8:39 PM CDTSevere Thunderstorm WatchSPCBarton, Butler, Cowley, Ellsworth, Harper, Harvey and 16 more5 hr
May 18, 9:08 PM CDTMesoscale DiscussionSPCBarber, Cheyenne, Clark, Comanche, Decatur, Edwards and 33 more67 min
May 18, 11:14 PM CDTMesoscale DiscussionSPCBarber, Barton, Butler, Cheyenne, Clark, Comanche and 50 more46 min
May 19, 7:50 AM CDTMesoscale DiscussionSPCAllen, Anderson, Bourbon, Chautauqua, Cherokee, Coffey and 10 more115 min
May 19, 12:39 PM CDTMesoscale DiscussionSPCChautauqua, Cowley, Elk, Harper, Montgomery, Sumner and 1 more3 hr
May 19, 1:42 PM CDTMesoscale DiscussionSPCAtchison, Brown, Clay, Cloud, Dickinson, Doniphan and 17 more3 hr
May 19, 2:30 PM CDTSevere Thunderstorm WatchSPCAllen, Bourbon, Butler, Chase, Chautauqua, Cherokee and 15 more11 hr
May 19, 4:21 PM CDTSevere Thunderstorm WatchSPCAnderson, Atchison, Coffey, Douglas, Franklin, Geary and 12 more3 hr
May 19, 11:56 AM CDTMesoscale DiscussionSPCButler, Carter, Dent, Douglas, Howell, Laclede and 12 more2 hr
May 19, 1:36 PM CDTSevere Thunderstorm WatchSPCButler, Carter, Dent, Douglas, Dunklin, Howell and 12 more6 hr
May 19, 3:35 PM CDTMesoscale DiscussionSPCButler, Carter, Dunklin, Mississippi, New Madrid, Oregon and 5 more85 min
May 19, 6:14 PM CDTMesoscale DiscussionSPCDunklin, Mississippi, New Madrid, Pemiscot, Scott61 min
May 18, 9:40 PM CDTMesoscale DiscussionSPCAlfalfa, Beckham, Blaine, Custer, Dewey, Ellis and 11 more65 min
May 19, 1:05 PM CDTMesoscale DiscussionSPCBeckham, Blaine, Caddo, Canadian, Comanche, Custer and 6 more2 hr
May 19, 6:50 PM CDTMesoscale DiscussionSPCCimarron, Texas2 hr

Nearby

Mesoscale Discussions in Oklahoma, 2018Mesoscale Discussions in Missouri, 2018Mesoscale Discussions in Texas, 2018Every mesoscale discussion 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.