Alert archive / Texas / Mesoscale Discussions in 2007

Mesoscale Discussion 660

May 2, 200719 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at May 2, 2007, 11:48 PM CDT for 19 counties in Texas. It was in force for 87 min.

The area

The outline as issued.

The facts

Issued: May 2, 2007, 11:48 PM CDT (04:48 UTC)
Expired: May 3, 2007, 1:15 AM CDT
In force: 87 min
Issued by: the Storm Prediction Center

Counties Austin County, TX, Brazoria County, TX, Chambers County, TX, Colorado County, TX, Fort Bend 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, Orange County, TX, Polk County, TX, San Jacinto County, TX, Tyler County, TX, Waller County, TX, Wharton County, TX

The radar

The Houston radar (KHGX), 62 km from the middle of the area, began a volume at 04:49 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, 4.8 hours before the alert went out and 225 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: 286 J/kg
Mixed-layer CIN: -225 J/kg
Mixed-layer LCL: 1036 m above ground
0-6 km bulk shear: 26 kt
0-1 km storm-relative helicity: 12 m²/s²
0-3 km storm-relative helicity: 51 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

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
May 2, 7:24 PM CDT	Mesoscale Discussion	SPC	Anderson, Angelina, Atascosa, Austin, Bandera, Bastrop and 110 more	96 min
May 2, 7:59 PM CDT	Tornado Watch	SPC	Angelina, Bowie, Brazos, Burleson, Camp, Cass and 25 more	7 hr
May 2, 9:10 PM CDT	Mesoscale Discussion	SPC	Brewster, Crane, Pecos, Reeves, Terrell, Ward	65 min
May 2, 9:30 PM CDT	Mesoscale Discussion	SPC	Anderson, Bell, Bosque, Collin, Cooke, Coryell and 33 more	60 min
May 2, 9:57 PM CDT	Mesoscale Discussion	SPC	Aransas, Bee, Brazoria, Calhoun, Chambers, Fort Bend and 21 more	63 min
May 2, 10:19 PM CDT	Severe Thunderstorm Watch	SPC	Austin, Brazoria, Chambers, Colorado, Fort Bend, Galveston and 16 more	6 hr
May 2, 10:48 PM CDT	Tornado Watch	SPC	Aransas, Bee, Brooks, Calhoun, Cameron, DeWitt and 17 more	5 hr
May 2, 11:09 PM CDT	Mesoscale Discussion	SPC	Bowie, Camp, Cass, Franklin, Gregg, Harrison and 12 more	96 min
May 3, 12:01 AM CDT	Mesoscale Discussion	SPC	Austin, Brazoria, Chambers, Colorado, Fort Bend, Hardin and 13 more	89 min
May 3, 1:21 AM CDT	Mesoscale Discussion	SPC	Harrison, Panola, Sabine, San Augustine, Shelby	84 min
May 3, 1:52 AM CDT	Mesoscale Discussion	SPC	Cameron, Kenedy, Willacy	83 min
May 3, 12:08 PM CDT	Mesoscale Discussion	SPC	Bosque, Burnet, Coryell, Hamilton, Hood, Johnson and 7 more	97 min
May 3, 2:19 PM CDT	Mesoscale Discussion	SPC	Austin, Chambers, Colorado, Fort Bend, Hardin, Harris and 10 more	86 min
May 3, 3:08 PM CDT	Tornado Watch	SPC	Angelina, Austin, Brazoria, Brazos, Burleson, Chambers and 26 more	7 hr
May 3, 6:34 PM CDT	Mesoscale Discussion	SPC	Angelina, Brazos, Burleson, Chambers, Grimes, Hardin and 19 more	116 min
May 3, 6:49 PM CDT	Mesoscale Discussion	SPC	Bosque, Dallas, Hamilton, Johnson	56 min

Nearby

Mesoscale Discussions in Texas, 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.