Alert archive / Oklahoma / Mesoscale Discussions in 2008

Mesoscale Discussion 699

April 23, 200822 counties in Oklahoma; 16 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Apr 23, 2008, 11:42 AM CDT for 22 counties in Oklahoma; 16 counties in Texas. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
Apr 23, 2008, 11:42 AM CDT (16:42 UTC)
Expired
Apr 23, 2008, 1:45 PM CDT
In force
2 hr
Issued by
the Storm Prediction Center
All 38 counties

Atoka County, OK, Bryan County, OK, Carter County, OK, Cleveland County, OK, Coal County, OK, Garvin County, OK, Grady County, OK, Hughes County, OK, Jefferson County, OK, Johnston County, OK, Lincoln County, OK, Love County, OK, Marshall County, OK, McClain County, OK, Murray County, OK, Okfuskee County, OK, Oklahoma County, OK, Payne County, OK, Pontotoc County, OK, Pottawatomie County, OK, Seminole County, OK, Stephens County, OK, Clay County, TX, Collin County, TX, Cooke County, TX, Dallas County, TX, Denton County, TX, Fannin County, TX, Grayson County, TX, Hood County, TX, Hunt County, TX, Jack County, TX, Montague County, TX, Palo Pinto County, TX, Parker County, TX, Rockwall County, TX, Tarrant County, TX, Wise County, TX

The radar

The Norman radar (KTLX), 100 km from the middle of the area, began a volume at 16:43 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 12:00Z, 4.7 hours before the alert went out and 89 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 2008-04-23Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2105 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 2008-04-23The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 68 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
2105 J/kg
Mixed-layer CIN
-99 J/kg
Mixed-layer LCL
979 m above ground
0-6 km bulk shear
27 kt
0-1 km storm-relative helicity
68 m²/s²
0-3 km storm-relative helicity
59 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.8

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
Apr 23, 2:01 AM CDTMesoscale DiscussionSPCBlaine, Caddo, Canadian, Cleveland, Comanche, Cotton and 14 more89 min
Apr 23, 7:31 AM CDTMesoscale DiscussionSPCBeckham, Custer, Dewey, Ellis, Greer, Harmon and 5 more59 min
Apr 23, 9:32 AM CDTSevere Thunderstorm WatchSPCAlfalfa, Beaver, Beckham, Blaine, Caddo, Comanche and 21 more6 hr
Apr 23, 3:37 PM CDTMesoscale DiscussionSPCAdair, Alfalfa, Beaver, Beckham, Blaine, Caddo and 43 more53 min
Apr 23, 3:52 PM CDTSevere Thunderstorm WatchSPCBeaver, Cimarron, Texas4 hr
Apr 23, 9:59 AM CDTMesoscale DiscussionSPCBorden, Callahan, Coke, Dawson, Fisher, Garza and 18 more61 min
Apr 23, 10:07 AM CDTTornado WatchSPCAndrews, Borden, Coke, Concho, Crane, Dawson and 25 more6 hr
Apr 23, 1:35 PM CDTMesoscale DiscussionSPCAndrews, Borden, Coke, Crane, Dawson, Ector and 20 more85 min
Apr 23, 2:28 PM CDTMesoscale DiscussionSPCAngelina, Bowie, Camp, Cass, Cherokee, Franklin and 18 more3 hr
Apr 23, 3:16 PM CDTMesoscale DiscussionSPCAndrews, Borden, Brown, Callahan, Coke, Coleman and 34 more59 min
Apr 23, 3:25 PM CDTTornado WatchSPCAndrews, Borden, Brown, Callahan, Coke, Coleman and 44 more8 hr
Apr 23, 5:43 PM CDTMesoscale DiscussionSPCAndrews, Borden, Brown, Callahan, Coke, Coleman and 44 more92 min
Apr 23, 6:20 PM CDTTornado WatchSPCAnderson, Bosque, Collin, Coryell, Dallas, Delta and 24 more7 hr

Nearby

Mesoscale Discussions in Oklahoma, 2008Mesoscale Discussions in Texas, 2008Every mesoscale discussion in 2008

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.