Alert archive / Texas / Mesoscale Discussions in 2006

Mesoscale Discussion 667

April 26, 20067 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Apr 26, 2006, 6:05 AM CDT for 7 counties in Texas. It was in force for 55 min.

The area

The outline as issued.

The facts

Issued: Apr 26, 2006, 6:05 AM CDT (11:05 UTC)
Expired: Apr 26, 2006, 7:00 AM CDT
In force: 55 min
Issued by: the Storm Prediction Center

Counties Grimes County, TX, Liberty County, TX, Montgomery County, TX, Polk County, TX, San Jacinto County, TX, Trinity County, TX, Walker County, TX

The radar

The Houston radar (KHGX), 110 km from the middle of the area, began a volume at 11:06 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 00:00Z, 11.1 hours before the alert went out and 221 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: 2353 J/kg
Mixed-layer CIN: -5 J/kg
Mixed-layer LCL: 758 m above ground
0-6 km bulk shear: 25 kt
0-1 km storm-relative helicity: 3 m²/s²
0-3 km storm-relative helicity: 38 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 0.7

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 25, 7:16 PM CDT	Severe Thunderstorm Watch	SPC	Brooks, Cameron, Hidalgo, Jim Hogg, Kenedy, Starr and 2 more	5 hr
Apr 25, 7:31 PM CDT	Mesoscale Discussion	SPC	Aransas, Atascosa, Austin, Bee, Brazoria, Calhoun and 36 more	89 min
Apr 25, 8:45 PM CDT	Mesoscale Discussion	SPC	Jasper, Newton, Sabine, San Augustine, Shelby, Tyler	90 min
Apr 25, 9:38 PM CDT	Mesoscale Discussion	SPC	Brooks, Cameron, Hidalgo, Jim Hogg, Kenedy, Starr and 2 more	97 min
Apr 25, 9:42 PM CDT	Severe Thunderstorm Watch	SPC	Angelina, Brazoria, Chambers, Galveston, Gregg, Hardin and 13 more	6 hr
Apr 25, 11:42 PM CDT	Mesoscale Discussion	SPC	Angelina, Chambers, Galveston, Hardin, Jasper, Jefferson and 7 more	63 min
Apr 25, 11:57 PM CDT	Mesoscale Discussion	SPC	Bandera, Bastrop, Bexar, Blanco, Brazos, Burleson and 16 more	93 min
Apr 26, 1:01 AM CDT	Severe Thunderstorm Watch	SPC	Austin, Bastrop, Brazoria, Caldwell, Chambers, Colorado and 19 more	6 hr
Apr 26, 3:19 AM CDT	Mesoscale Discussion	SPC	Angelina, Austin, Bastrop, Brazoria, Caldwell, Chambers and 29 more	86 min

Nearby

Mesoscale Discussions in Texas, 2006 Every 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.