Alert archive / Texas / Mesoscale Discussions in 2007

Mesoscale Discussion 589

April 25, 20075 counties in Arkansas; 5 parishes in Louisiana; 8 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Apr 25, 2007, 6:15 PM CDT for 5 counties in Arkansas; 5 parishes in Louisiana; 8 counties in Texas. It was in force for 90 min.

The area

The outline as issued.

The facts

Issued: Apr 25, 2007, 6:15 PM CDT (23:15 UTC)
Expired: Apr 25, 2007, 7:45 PM CDT
In force: 90 min
Issued by: the Storm Prediction Center

Counties Clark County, AR, Columbia County, AR, Lafayette County, AR, Nevada County, AR, Ouachita County, AR, Bossier Parish, LA, Caddo Parish, LA, Claiborne Parish, LA, De Soto Parish, LA, Webster Parish, LA, Angelina County, TX, Nacogdoches County, TX, Panola County, TX, Polk County, TX, San Augustine County, TX, Shelby County, TX, Trinity County, TX, Walker County, TX

The radar

The Shreveport radar (KSHV), 54 km from the middle of the area, began a volume at 23:18 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 nearest sounding before it

Lake Charles Mun, LA (KLCH), launched 12:00Z, 11.3 hours before the alert went out and 241 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 835 J/kg
Mixed-layer CIN: -10 J/kg
Mixed-layer LCL: 644 m above ground
0-6 km bulk shear: 26 kt
0-1 km storm-relative helicity: 63 m²/s²
0-3 km storm-relative helicity: 76 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 1.4

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.

Issued	Product	Office	Counties	Lasted
Apr 24, 7:33 PM CDT	Mesoscale Discussion	SPC	Benton, Carroll, Clark, Crawford, Franklin, Hempstead and 15 more	117 min
Apr 24, 9:10 PM CDT	Tornado Watch	SPC	Baxter, Boone, Clark, Cleburne, Conway, Dallas and 26 more	4 hr
Apr 24, 10:05 PM CDT	Mesoscale Discussion	SPC	Clay, Craighead, Crittenden, Cross, Greene, Jackson and 4 more	85 min
Apr 24, 10:07 PM CDT	Mesoscale Discussion	SPC	Little River, Miller, Sevier	83 min
Apr 24, 10:35 PM CDT	Tornado Watch	SPC	Hempstead, Howard, Lafayette, Little River, Miller, Nevada and 1 more	5 hr
Apr 24, 10:53 PM CDT	Severe Thunderstorm Watch	SPC	Clay, Craighead, Greene, Lawrence, Mississippi, Poinsett and 1 more	3 hr
Apr 24, 11:58 PM CDT	Mesoscale Discussion	SPC	Clark, Dallas, Garland, Grant, Hempstead, Hot Spring and 15 more	92 min
Apr 25, 12:45 AM CDT	Mesoscale Discussion	SPC	Clay, Craighead, Greene, Lawrence, Mississippi, Poinsett and 2 more	90 min
Apr 25, 2:10 AM CDT	Mesoscale Discussion	SPC	Columbia, Union	65 min
Apr 25, 12:30 PM CDT	Mesoscale Discussion	SPC	Benton, Carroll, Washington	60 min
Apr 25, 1:11 PM CDT	Severe Thunderstorm Watch	SPC	Benton, Carroll	8 hr
Apr 25, 2:46 PM CDT	Mesoscale Discussion	SPC	Baxter, Boone, Conway, Crawford, Franklin, Johnson and 12 more	59 min
Apr 25, 3:38 PM CDT	Tornado Watch	SPC	Baxter, Benton, Boone, Carroll, Cleburne, Conway and 25 more	6 hr
Apr 25, 6:38 PM CDT	Mesoscale Discussion	SPC	Baxter, Boone, Cleburne, Conway, Faulkner, Fulton and 17 more	97 min
Apr 25, 9:00 AM CDT	Mesoscale Discussion	SPC	Acadia, Allen, Avoyelles, Beauregard, Calcasieu, Cameron and 7 more	60 min
Apr 25, 9:13 AM CDT	Tornado Watch	SPC	Acadia, Allen, Avoyelles, Beauregard, Calcasieu, Cameron and 10 more	8 hr
Apr 25, 1:23 PM CDT	Mesoscale Discussion	SPC	Catahoula, Concordia, East Feliciana, Franklin, Madison, Tensas and 1 more	67 min
Apr 25, 1:46 PM CDT	Tornado Watch	SPC	Catahoula, Concordia, East Baton Rouge, East Carroll, East Feliciana, Franklin and 9 more	5 hr
Apr 25, 3:05 PM CDT	Mesoscale Discussion	SPC	Acadia, Allen, Beauregard, Calcasieu, Cameron, Evangeline and 6 more	55 min
Apr 24, 10:53 PM CDT	Tornado Watch	SPC	Atascosa, Bandera, Bastrop, Bexar, Blanco, Burnet and 28 more	7 hr
Apr 25, 1:14 AM CDT	Mesoscale Discussion	SPC	Atascosa, Bandera, Bastrop, Bee, Bexar, Blanco and 35 more	91 min
Apr 25, 1:40 AM CDT	Tornado Watch	SPC	Aransas, Austin, Bee, Brazoria, Brazos, Burleson and 30 more	7 hr
Apr 25, 4:29 AM CDT	Mesoscale Discussion	SPC	Angelina, Aransas, Austin, Bee, Brazoria, Brazos and 35 more	91 min
Apr 25, 7:36 AM CDT	Mesoscale Discussion	SPC	Aransas, Austin, Bee, Brazoria, Calhoun, Chambers and 28 more	84 min

Nearby

Mesoscale Discussions in Texas, 2007 Mesoscale Discussions in Arkansas, 2007 Mesoscale Discussions in Louisiana, 2007 Every 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.