Alert archive / Texas / Mesoscale Discussions in 2007

Mesoscale Discussion 560

April 24, 2007Polk County, Sebastian County, Arkansas; 14 counties in Oklahoma; 29 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Apr 24, 2007, 12:40 PM CDT for Polk County, Sebastian County, Arkansas; 14 counties in Oklahoma; 29 counties in Texas. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
Apr 24, 2007, 12:40 PM CDT (17:40 UTC)
Expired
Apr 24, 2007, 2:45 PM CDT
In force
2 hr
Issued by
the Storm Prediction Center
All 45 counties

Polk County, AR, Sebastian County, AR, Adair County, OK, Atoka County, OK, Bryan County, OK, Choctaw County, OK, Haskell County, OK, Latimer County, OK, LeFlore County, OK, McCurtain County, OK, McIntosh County, OK, Muskogee County, OK, Okmulgee County, OK, Pittsburg County, OK, Pushmataha County, OK, Sequoyah County, OK, Bosque County, TX, Collin County, TX, Coryell County, TX, Dallas County, TX, Delta County, TX, Denton County, TX, Ellis County, TX, Fannin County, TX, Franklin County, TX, Grayson County, TX, Hamilton County, TX, Henderson County, TX, Hill County, TX, Hopkins County, TX, Hunt County, TX, Johnson County, TX, Kaufman County, TX, Lamar County, TX, Limestone County, TX, McLennan County, TX, Navarro County, TX, Rains County, TX, Red River County, TX, Rockwall County, TX, Somervell County, TX, Tarrant County, TX, Titus County, TX, Van Zandt County, TX, Wood County, TX

The radar

The Dallas/Ft Worth radar (KFWS), 105 km from the middle of the area, began a volume at 17:43 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

Fort Worth, TX (KFWD), launched 12:00Z, 5.7 hours before the alert went out and 92 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, Fort Worth, TX at 12:00Z on 2007-04-24Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 819 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, Fort Worth, TX at 12:00Z on 2007-04-24The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 192 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
819 J/kg
Mixed-layer CIN
-306 J/kg
Mixed-layer LCL
685 m above ground
0-6 km bulk shear
30 kt
0-1 km storm-relative helicity
192 m²/s²
0-3 km storm-relative helicity
177 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
Apr 24, 2:40 PM CDTTornado WatchSPCHoward, Little River, Miller, Sevier8 hr
Apr 24, 3:01 PM CDTTornado WatchSPCBenton, Carroll, Clark, Conway, Crawford, Dallas and 17 more7 hr
Apr 24, 3:10 PM CDTMesoscale DiscussionSPCArkansas, Ashley, Baxter, Bradley, Calhoun, Clark and 45 more2 hr
Apr 23, 7:05 PM CDTMesoscale DiscussionSPCBeaver, Beckham, Custer, Dewey, Ellis, Greer and 10 more115 min
Apr 23, 8:54 PM CDTMesoscale DiscussionSPCGrant, Kay2 hr
Apr 24, 10:04 AM CDTMesoscale DiscussionSPCAlfalfa, Blaine, Caddo, Canadian, Comanche, Cotton and 18 more116 min
Apr 24, 11:23 AM CDTTornado WatchSPCAlfalfa, Atoka, Blaine, Bryan, Caddo, Canadian and 36 more9 hr
Apr 24, 11:28 AM CDTMesoscale DiscussionSPCCotton, Jefferson, Love, Tillman2 hr
Apr 24, 3:37 PM CDTMesoscale DiscussionSPCAlfalfa, Blaine, Bryan, Caddo, Canadian, Carter and 33 more83 min
Apr 24, 6:16 PM CDTMesoscale DiscussionSPCAlfalfa, Atoka, Blaine, Bryan, Caddo, Canadian and 36 more119 min
Apr 23, 7:48 PM CDTTornado WatchSPCEdwards, Kinney, Maverick, Real, Uvalde, Val Verde and 1 more105 min
Apr 23, 9:17 PM CDTMesoscale DiscussionSPCKinney, Uvalde118 min
Apr 23, 10:22 PM CDTMesoscale DiscussionSPCBaylor, Callahan, Coke, Cottle, Crosby, Dickens and 18 more83 min
Apr 24, 7:29 AM CDTMesoscale DiscussionSPCCrockett, Glasscock, Irion, Reagan, Sterling, Upton91 min
Apr 24, 11:49 AM CDTTornado WatchSPCBrown, Callahan, Coke, Coleman, Collin, Comanche and 35 more11 hr
Apr 24, 3:58 PM CDTTornado Watch PDSSPCAnderson, Bandera, Bell, Bexar, Blanco, Brown and 43 more7 hr
Apr 24, 6:44 PM CDTMesoscale DiscussionSPCBandera, Bell, Bexar, Blanco, Bosque, Brown and 39 more2 hr

Nearby

Mesoscale Discussions in Texas, 2007Mesoscale Discussions in Oklahoma, 2007Mesoscale Discussions in Arkansas, 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.