Alert archive / Texas / Mesoscale Discussions in 2007

Mesoscale Discussion 581

April 25, 200734 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Apr 25, 2007, 7:36 AM CDT for 34 counties in Texas. It was in force for 84 min.

The area

The outline as issued.

The facts

Issued
Apr 25, 2007, 7:36 AM CDT (12:36 UTC)
Expired
Apr 25, 2007, 9:00 AM CDT
In force
84 min
Issued by
the Storm Prediction Center
All 34 counties

Aransas County, TX, Austin County, TX, Bee County, TX, Brazoria County, TX, Calhoun County, TX, Chambers County, TX, Colorado County, TX, DeWitt County, TX, Fayette County, TX, Fort Bend County, TX, Galveston County, TX, Goliad County, TX, Grimes County, TX, Hardin County, TX, Harris County, TX, Jackson County, TX, Jasper County, TX, Jefferson County, TX, Liberty County, TX, Matagorda County, TX, Montgomery County, TX, Newton County, TX, Orange County, TX, Polk County, TX, Refugio County, TX, San Jacinto County, TX, San Patricio County, TX, Trinity County, TX, Tyler County, TX, Victoria County, TX, Walker County, TX, Waller County, TX, Washington County, TX, Wharton County, TX

The radar

The Houston radar (KHGX), 48 km from the middle of the area, began a volume at 12:39 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

Lake Charles Mun, LA (KLCH), launched 12:00Z, 0.6 hours before the alert went out and 242 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, Lake Charles Mun, LA at 12:00Z on 2007-04-25Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 835 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, Lake Charles Mun, LA at 12:00Z on 2007-04-25The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 63 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
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.

IssuedProductOfficeCountiesLasted
Apr 24, 7:33 PM CDTMesoscale DiscussionSPCBowie, Camp, Cass, Collin, Dallas, Delta and 25 more117 min
Apr 24, 10:07 PM CDTMesoscale DiscussionSPCAnderson, Atascosa, Bandera, Bastrop, Bell, Bexar and 65 more83 min
Apr 24, 10:35 PM CDTTornado WatchSPCAnderson, Bell, Bosque, Bowie, Camp, Cass and 37 more5 hr
Apr 24, 10:53 PM CDTTornado WatchSPCAtascosa, Bandera, Bastrop, Bexar, Blanco, Burnet and 28 more7 hr
Apr 24, 11:58 PM CDTMesoscale DiscussionSPCAnderson, Bell, Bowie, Camp, Cass, Cherokee and 20 more92 min
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, 2:10 AM CDTMesoscale DiscussionSPCSabine, San Augustine, Shelby65 min
Apr 25, 4:29 AM CDTMesoscale DiscussionSPCAngelina, Aransas, Austin, Bee, Brazoria, Brazos and 35 more91 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
Apr 25, 6:15 PM CDTMesoscale DiscussionSPCAngelina, Nacogdoches, Panola, Polk, San Augustine, Shelby and 2 more90 min

Nearby

Mesoscale 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.