Alert archive / Texas / Mesoscale Discussions in 2006

Mesoscale Discussion 658

April 25, 200642 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Apr 25, 2006, 7:31 PM CDT for 42 counties in Texas. It was in force for 89 min.

The area

The outline as issued.

The facts

Issued
Apr 25, 2006, 7:31 PM CDT (00:31 UTC)
Expired
Apr 25, 2006, 9:00 PM CDT
In force
89 min
Issued by
the Storm Prediction Center
All 42 counties

Aransas County, TX, Atascosa County, TX, Austin County, TX, Bee County, TX, Brazoria County, TX, Calhoun County, TX, Chambers County, TX, Colorado County, TX, DeWitt County, TX, Dimmit County, TX, Duval County, TX, Fayette County, TX, Fort Bend County, TX, Frio County, TX, Galveston County, TX, Goliad County, TX, Harris County, TX, Jackson County, TX, Jim Wells County, TX, Karnes County, TX, Kleberg County, TX, La Salle County, TX, Lavaca County, TX, Liberty County, TX, Live Oak County, TX, Matagorda County, TX, Maverick County, TX, McMullen County, TX, Montgomery County, TX, Nueces County, TX, Polk County, TX, Refugio County, TX, San Jacinto County, TX, San Patricio County, TX, Victoria County, TX, Walker County, TX, Waller County, TX, Washington County, TX, Webb County, TX, Wharton County, TX, Wilson County, TX, Zavala County, TX

The radar

The Austin/San Antonio radar (KEWX), 106 km from the middle of the area, began a volume at 00:31 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

Corpus Christi, TX (KCRP), launched 00:00Z, 0.5 hours before the alert went out and 127 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, Corpus Christi, TX at 00:00Z on 2006-04-26Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2996 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, Corpus Christi, TX at 00:00Z on 2006-04-26The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -45 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
2996 J/kg
Mixed-layer CIN
-86 J/kg
Mixed-layer LCL
754 m above ground
0-6 km bulk shear
49 kt
0-1 km storm-relative helicity
-45 m²/s²
0-3 km storm-relative helicity
22 m²/s²
Significant tornado parameter
-0.1
Supercell composite
-0.5

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 25, 7:16 PM CDTSevere Thunderstorm WatchSPCBrooks, Cameron, Hidalgo, Jim Hogg, Kenedy, Starr and 2 more5 hr
Apr 25, 8:45 PM CDTMesoscale DiscussionSPCJasper, Newton, Sabine, San Augustine, Shelby, Tyler90 min
Apr 25, 9:38 PM CDTMesoscale DiscussionSPCBrooks, Cameron, Hidalgo, Jim Hogg, Kenedy, Starr and 2 more97 min
Apr 25, 9:42 PM CDTSevere Thunderstorm WatchSPCAngelina, Brazoria, Chambers, Galveston, Gregg, Hardin and 13 more6 hr
Apr 25, 11:42 PM CDTMesoscale DiscussionSPCAngelina, Chambers, Galveston, Hardin, Jasper, Jefferson and 7 more63 min
Apr 25, 11:57 PM CDTMesoscale DiscussionSPCBandera, Bastrop, Bexar, Blanco, Brazos, Burleson and 16 more93 min
Apr 26, 1:01 AM CDTSevere Thunderstorm WatchSPCAustin, Bastrop, Brazoria, Caldwell, Chambers, Colorado and 19 more6 hr
Apr 26, 3:19 AM CDTMesoscale DiscussionSPCAngelina, Austin, Bastrop, Brazoria, Caldwell, Chambers and 29 more86 min
Apr 26, 6:05 AM CDTMesoscale DiscussionSPCGrimes, Liberty, Montgomery, Polk, San Jacinto, Trinity and 1 more55 min

Nearby

Mesoscale Discussions in Texas, 2006Every mesoscale discussion in 2006

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.