Alert archive / Oklahoma / Mesoscale Discussions in 2020

Mesoscale Discussion 554

May 7, 202042 counties in Oklahoma; Hemphill County, Wheeler County, Texas

The Storm Prediction Center issued this mesoscale discussion at May 7, 2020, 11:12 PM CDT for 42 counties in Oklahoma; Hemphill County, Wheeler County, Texas. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
May 7, 2020, 11:12 PM CDT (04:12 UTC)
Expired
May 8, 2020, 1:15 AM CDT
In force
2 hr
Issued by
the Storm Prediction Center
All 44 counties

Beckham County, OK, Blaine County, OK, Caddo County, OK, Canadian County, OK, Cleveland County, OK, Coal County, OK, Comanche County, OK, Creek County, OK, Custer County, OK, Dewey County, OK, Garfield County, OK, Garvin County, OK, Grady County, OK, Greer County, OK, Hughes County, OK, Kay County, OK, Kingfisher County, OK, Kiowa County, OK, Lincoln County, OK, Logan County, OK, Major County, OK, Mayes County, OK, McClain County, OK, McIntosh County, OK, Muskogee County, OK, Noble 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, Roger Mills County, OK, Rogers County, OK, Seminole County, OK, Tulsa County, OK, Wagoner County, OK, Washington County, OK, Washita County, OK, Hemphill County, TX, Wheeler County, TX

The radar

The Norman radar (KTLX), 89 km from the middle of the area, began a volume at 04:15 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 watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

The nearest sounding before it

Norman, OK (KOUN), launched 00:00Z, 4.2 hours before the alert went out and 84 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 2020-05-08Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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 2020-05-08The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 177 square meters per square second.1939587897Sfc1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1914 m above ground
0-6 km bulk shear
57 kt
0-1 km storm-relative helicity
177 m²/s²
0-3 km storm-relative helicity
596 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 7, 7:40 PM CDTSevere Thunderstorm WatchSPCAlfalfa, Beaver, Blaine, Caddo, Canadian, Cleveland and 21 more7 hr
May 7, 9:24 PM CDTMesoscale DiscussionSPCBeaver, Ellis, Harper, Woodward96 min
May 7, 11:25 PM CDTSevere Thunderstorm WatchSPCAtoka, Beckham, Bryan, Carter, Choctaw, Coal and 24 more5 hr
May 8, 1:22 AM CDTMesoscale DiscussionSPCAtoka, Bryan, Carter, Choctaw, Cleveland, Coal and 18 more113 min
May 8, 2:30 AM CDTMesoscale DiscussionSPCAtoka, Bryan, Carter, Choctaw, Coal, Cotton and 10 more2 hr
May 8, 3:06 AM CDTSevere Thunderstorm WatchSPCMcCurtain7 hr
May 7, 8:05 PM CDTMesoscale DiscussionSPCArcher, Jack, Palo Pinto, Young85 min
May 7, 8:27 PM CDTSevere Thunderstorm WatchSPCEllis, Jack, Johnson, Palo Pinto, Parker, Tarrant and 2 more4 hr
May 7, 9:53 PM CDTMesoscale DiscussionSPCJack, Johnson, Parker, Tarrant, Wise67 min
May 8, 5:22 AM CDTMesoscale DiscussionSPCCamp, Gregg, Harrison, Marion, Panola, Shelby and 1 more83 min
May 8, 9:30 AM CDTMesoscale DiscussionSPCAngelina, Jasper, Nacogdoches, Newton, Sabine, San Augustine and 1 more2 hr
May 8, 1:36 PM CDTSevere Thunderstorm WatchSPCNewton, Orange6 hr

Nearby

Mesoscale Discussions in Oklahoma, 2020Mesoscale Discussions in Texas, 2020Every mesoscale discussion in 2020

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.