Alert archive / Oklahoma / Mesoscale Discussions in 2010

Mesoscale Discussion 620

May 19, 201019 counties in Oklahoma; Hemphill County, Lipscomb County, Texas

The Storm Prediction Center issued this mesoscale discussion at May 19, 2010, 3:23 AM CDT for 19 counties in Oklahoma; Hemphill County, Lipscomb County, Texas. It was in force for 67 min.

The area

The outline as issued.

The facts

Issued
May 19, 2010, 3:23 AM CDT (08:23 UTC)
Expired
May 19, 2010, 4:30 AM CDT
In force
67 min
Issued by
the Storm Prediction Center
All 21 counties

Alfalfa County, OK, Blaine County, OK, Creek County, OK, Custer County, OK, Dewey County, OK, Ellis County, OK, Garfield County, OK, Grant County, OK, Kingfisher County, OK, Lincoln County, OK, Logan County, OK, Major County, OK, Noble County, OK, Osage County, OK, Pawnee County, OK, Payne County, OK, Roger Mills County, OK, Woods County, OK, Woodward County, OK, Hemphill County, TX, Lipscomb County, TX

The radar

The Vance AFB radar (KVNX), 79 km from the middle of the area, began a volume at 08:26 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

Lamont, OK (KLMN), launched 00:00Z, 8.4 hours before the alert went out and 126 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, Lamont, OK at 00:00Z on 2010-05-19Temperature 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, Lamont, OK at 00:00Z on 2010-05-19The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -3 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1300 m above ground
0-6 km bulk shear
37 kt
0-1 km storm-relative helicity
-3 m²/s²
0-3 km storm-relative helicity
112 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

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SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 18, 7:41 PM CDTMesoscale DiscussionSPCCimarron, Texas64 min
May 18, 9:27 PM CDTMesoscale DiscussionSPCBeckham, Custer, Dewey, Ellis, Greer, Harmon and 6 more93 min
May 18, 10:36 PM CDTMesoscale DiscussionSPCBeaver, Beckham, Dewey, Ellis, Harper, Roger Mills and 2 more54 min
May 18, 10:49 PM CDTTornado WatchSPCBeaver, Beckham, Cimarron, Custer, Dewey, Ellis and 7 more5 hr
May 19, 1:24 AM CDTMesoscale DiscussionSPCBeaver, Beckham, Cimarron, Custer, Dewey, Ellis and 6 more66 min
May 19, 3:42 AM CDTSevere Thunderstorm WatchSPCAlfalfa, Beaver, Blaine, Creek, Custer, Dewey and 25 more6 hr
May 19, 5:32 AM CDTMesoscale DiscussionSPCAlfalfa, Creek, Dewey, Garfield, Grant, Kay and 7 more58 min
May 19, 1:22 PM CDTMesoscale DiscussionSPCAtoka, Beckham, Blaine, Bryan, Caddo, Canadian and 43 more113 min
May 19, 2:06 PM CDTTornado Watch PDSSPCAtoka, Beckham, Blaine, Bryan, Caddo, Canadian and 50 more8 hr
May 19, 3:20 PM CDTMesoscale DiscussionSPCAtoka, Beckham, Blaine, Bryan, Caddo, Canadian and 43 more85 min
May 19, 5:30 PM CDTMesoscale DiscussionSPCAtoka, Caddo, Canadian, Cleveland, Coal, Comanche and 31 more60 min

Nearby

Mesoscale Discussions in Oklahoma, 2010Mesoscale Discussions in Texas, 2010Every mesoscale discussion in 2010

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.