Alert archive / Oklahoma / Mesoscale Discussions in 2007

Mesoscale Discussion 480

April 13, 200719 counties in Arkansas; 36 counties in Oklahoma; 4 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Apr 13, 2007, 12:37 PM CDT for 19 counties in Arkansas; 36 counties in Oklahoma; 4 counties in Texas. It was in force for 113 min.

The area

The outline as issued.

The facts

Issued
Apr 13, 2007, 12:37 PM CDT (17:37 UTC)
Expired
Apr 13, 2007, 2:30 PM CDT
In force
113 min
Issued by
the Storm Prediction Center
All 59 counties

Calhoun County, AR, Clark County, AR, Columbia County, AR, Dallas County, AR, Garland County, AR, Hempstead County, AR, Hot Spring County, AR, Howard County, AR, Lafayette County, AR, Little River County, AR, Miller County, AR, Montgomery County, AR, Nevada County, AR, Ouachita County, AR, Pike County, AR, Polk County, AR, Scott County, AR, Sebastian County, AR, Sevier County, AR, Atoka County, OK, Caddo County, OK, Canadian County, OK, Carter County, OK, Choctaw County, OK, Cleveland County, OK, Coal County, OK, Comanche County, OK, Cotton County, OK, Garvin County, OK, Grady County, OK, Haskell County, OK, Hughes County, OK, Jackson County, OK, Jefferson County, OK, Johnston County, OK, Kiowa County, OK, Latimer County, OK, LeFlore County, OK, Lincoln County, OK, McClain County, OK, McCurtain County, OK, McIntosh County, OK, Murray County, OK, Muskogee County, OK, Okfuskee County, OK, Oklahoma County, OK, Okmulgee County, OK, Pittsburg County, OK, Pontotoc County, OK, Pottawatomie County, OK, Pushmataha County, OK, Seminole County, OK, Sequoyah County, OK, Stephens County, OK, Tillman County, OK, Foard County, TX, Hardeman County, TX, Wichita County, TX, Wilbarger County, TX

The radar

The Norman radar (KTLX), 111 km from the middle of the area, began a volume at 17:39 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, 5.6 hours before the alert went out and 111 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 2007-04-13Temperature 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 12:00Z on 2007-04-13The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 669 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
1239 m above ground
0-6 km bulk shear
68 kt
0-1 km storm-relative helicity
669 m²/s²
0-3 km storm-relative helicity
913 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.6

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 13, 5:48 PM CDTTornado Watch PDSSPCColumbia, Lafayette, Miller, Union8 hr
Apr 13, 6:00 PM CDTSevere Thunderstorm WatchSPCArkansas, Ashley, Bradley, Calhoun, Chicot, Clark and 34 more8 hr
Apr 12, 7:37 PM CDTMesoscale DiscussionSPCBeckham, Comanche, Cotton, Greer, Harmon, Jackson and 4 more113 min
Apr 12, 11:46 PM CDTSevere Thunderstorm WatchSPCGreer, Harmon, Jackson7 hr
Apr 13, 2:36 AM CDTMesoscale DiscussionSPCBeckham, Ellis, Greer, Harmon, Jackson, Kiowa and 1 more84 min
Apr 13, 5:34 AM CDTMesoscale DiscussionSPCBeaver, Beckham, Blaine, Caddo, Comanche, Custer and 13 more86 min
Apr 13, 1:59 PM CDTSevere Thunderstorm WatchSPCAdair, Atoka, Blaine, Bryan, Caddo, Canadian and 44 more6 hr
Apr 13, 2:51 PM CDTMesoscale DiscussionSPCLove54 min
Apr 12, 9:35 PM CDTMesoscale DiscussionSPCArmstrong, Bailey, Briscoe, Carson, Castro, Childress and 35 more115 min
Apr 12, 11:31 PM CDTMesoscale DiscussionSPCAndrews, Armstrong, Bailey, Borden, Briscoe, Carson and 38 more119 min
Apr 13, 12:12 PM CDTMesoscale DiscussionSPCArcher, Baylor, Fisher, Haskell, Hood, Jack and 8 more63 min
Apr 13, 12:27 PM CDTTornado WatchSPCArcher, Baylor, Brown, Callahan, Clay, Coke and 27 more7 hr
Apr 13, 5:08 PM CDTMesoscale DiscussionSPCAngelina, Chambers, Cherokee, Hardin, Harris, Harrison and 18 more97 min
Apr 13, 5:43 PM CDTTornado Watch PDSSPCBell, Bosque, Collin, Cooke, Coryell, Dallas and 22 more4 hr
Apr 13, 5:58 PM CDTMesoscale DiscussionSPCBandera, Blanco, Burnet, Edwards, Gillespie, Hays and 16 more62 min
Apr 13, 6:27 PM CDTTornado WatchSPCAtascosa, Bandera, Bastrop, Bexar, Blanco, Burnet and 26 more8 hr

Nearby

Mesoscale Discussions in Oklahoma, 2007Mesoscale Discussions in Arkansas, 2007Mesoscale Discussions in Texas, 2007Every mesoscale discussion in 2007

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.