Alert archive / Texas / Mesoscale Discussions in 2007

Mesoscale Discussion 570

April 24, 20074 states

The Storm Prediction Center issued this mesoscale discussion at Apr 24, 2007, 7:33 PM CDT for 4 states. It was in force for 117 min.

The area

The outline as issued.

The facts

Issued
Apr 24, 2007, 7:33 PM CDT (00:33 UTC)
Expired
Apr 24, 2007, 9:30 PM CDT
In force
117 min
Issued by
the Storm Prediction Center
All 56 counties

Benton County, AR, Carroll County, AR, Clark County, AR, Crawford County, AR, Franklin County, AR, Hempstead County, AR, Howard County, AR, Johnson County, AR, Little River County, AR, Logan County, AR, Madison County, AR, Miller County, AR, Montgomery County, AR, Nevada County, AR, Pike County, AR, Polk County, AR, Scott County, AR, Sebastian County, AR, Sevier County, AR, Washington County, AR, Yell County, AR, Barry County, MO, McDonald County, MO, Stone County, MO, McCurtain County, OK, Bowie County, TX, Camp County, TX, Cass County, TX, Collin County, TX, Dallas County, TX, Delta County, TX, Ellis County, TX, Erath County, TX, Franklin County, TX, Gregg County, TX, Henderson County, TX, Hill County, TX, Hood County, TX, Hopkins County, TX, Hunt County, TX, Johnson County, TX, Kaufman County, TX, Lamar County, TX, Marion County, TX, Morris County, TX, Navarro County, TX, Rains County, TX, Red River County, TX, Rockwall County, TX, Smith County, TX, Somervell County, TX, Tarrant County, TX, Titus County, TX, Upshur County, TX, Van Zandt County, TX, Wood County, TX

The radar

The Western Arkansas radar (KSRX), 205 km from the middle of the area, began a volume at 00:33 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 00:00Z, 0.6 hours before the alert went out and 193 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 00:00Z on 2007-04-25Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1510 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 00:00Z on 2007-04-25The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 154 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
1510 J/kg
Mixed-layer CIN
-21 J/kg
Mixed-layer LCL
701 m above ground
0-6 km bulk shear
31 kt
0-1 km storm-relative helicity
154 m²/s²
0-3 km storm-relative helicity
126 m²/s²
Significant tornado parameter
1.0
Supercell composite
5.2

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, 9:10 PM CDTTornado WatchSPCBaxter, Boone, Clark, Cleburne, Conway, Dallas and 26 more4 hr
Apr 24, 10:05 PM CDTMesoscale DiscussionSPCClay, Craighead, Crittenden, Cross, Greene, Jackson and 4 more85 min
Apr 24, 10:07 PM CDTMesoscale DiscussionSPCLittle River, Miller, Sevier83 min
Apr 24, 10:35 PM CDTTornado WatchSPCHempstead, Howard, Lafayette, Little River, Miller, Nevada and 1 more5 hr
Apr 24, 10:53 PM CDTSevere Thunderstorm WatchSPCClay, Craighead, Greene, Lawrence, Mississippi, Poinsett and 1 more3 hr
Apr 24, 11:58 PM CDTMesoscale DiscussionSPCClark, Dallas, Garland, Grant, Hempstead, Hot Spring and 15 more92 min
Apr 25, 12:45 AM CDTMesoscale DiscussionSPCClay, Craighead, Greene, Lawrence, Mississippi, Poinsett and 2 more90 min
Apr 25, 2:10 AM CDTMesoscale DiscussionSPCColumbia, Union65 min
Apr 25, 12:30 PM CDTMesoscale DiscussionSPCBenton, Carroll, Washington60 min
Apr 25, 1:11 PM CDTSevere Thunderstorm WatchSPCBenton, Carroll8 hr
Apr 25, 2:46 PM CDTMesoscale DiscussionSPCBaxter, Boone, Conway, Crawford, Franklin, Johnson and 12 more59 min
Apr 25, 3:38 PM CDTTornado WatchSPCBaxter, Benton, Boone, Carroll, Cleburne, Conway and 25 more6 hr
Apr 25, 6:15 PM CDTMesoscale DiscussionSPCClark, Columbia, Lafayette, Nevada, Ouachita90 min
Apr 25, 6:38 PM CDTMesoscale DiscussionSPCBaxter, Boone, Cleburne, Conway, Faulkner, Fulton and 17 more97 min
Apr 24, 7:53 PM CDTMesoscale DiscussionSPCBarton, Bates, Benton, Boone, Caldwell, Callaway and 53 more97 min
Apr 25, 5:55 AM CDTMesoscale DiscussionSPCGrant, Kay, Osage, Washington2 hr
Apr 25, 9:33 AM CDTMesoscale DiscussionSPCCraig, Nowata, Osage, Ottawa, Washington87 min
Apr 24, 10:53 PM CDTTornado WatchSPCAtascosa, Bandera, Bastrop, Bexar, Blanco, Burnet and 28 more7 hr
Apr 25, 1:14 AM CDTMesoscale DiscussionSPCAtascosa, Bandera, Bastrop, Bee, Bexar, Blanco and 35 more91 min
Apr 25, 1:40 AM CDTTornado WatchSPCAransas, Austin, Bee, Brazoria, Brazos, Burleson and 30 more7 hr
Apr 25, 4:29 AM CDTMesoscale DiscussionSPCAngelina, Aransas, Austin, Bee, Brazoria, Brazos and 35 more91 min
Apr 25, 7:36 AM CDTMesoscale DiscussionSPCAransas, Austin, Bee, Brazoria, Calhoun, Chambers and 28 more84 min
Apr 25, 9:00 AM CDTMesoscale DiscussionSPCBrazoria, Chambers, Galveston, Hardin, Harris, Jasper and 9 more60 min
Apr 25, 9:13 AM CDTTornado WatchSPCAransas, Brazoria, Calhoun, Chambers, Fort Bend, Galveston and 8 more8 hr
Apr 25, 3:05 PM CDTMesoscale DiscussionSPCGalveston55 min

Nearby

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