Alert archive / Texas / Mesoscale Discussions in 2007

Mesoscale Discussion 55

January 13, 200716 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Jan 13, 2007, 8:13 PM CST for 16 counties in Texas. It was in force for 3 hr.

The area

The outline as issued.

The facts

Issued: Jan 13, 2007, 8:13 PM CST (02:13 UTC)
Expired: Jan 13, 2007, 10:45 PM CST
In force: 3 hr
Issued by: the Storm Prediction Center

Counties Angelina County, TX, Brazoria County, TX, Chambers County, TX, Fort Bend County, TX, Hardin County, TX, Harris County, TX, Jasper County, TX, Liberty County, TX, Montgomery County, TX, Newton County, TX, Polk County, TX, Sabine County, TX, San Augustine County, TX, San Jacinto County, TX, Tyler County, TX, Wharton County, TX

The radar

The Houston radar (KHGX), 77 km from the middle of the area, began a volume at 02:17 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, 2.2 hours before the alert went out and 176 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: 200 J/kg
Mixed-layer CIN: -52 J/kg
Mixed-layer LCL: 613 m above ground
0-6 km bulk shear: 41 kt
0-1 km storm-relative helicity: 128 m²/s²
0-3 km storm-relative helicity: 160 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 1.0

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
Jan 14, 1:15 AM CST	Mesoscale Discussion	SPC	Archer, Baylor, Borden, Callahan, Childress, Clay and 41 more	6 hr
Jan 14, 6:51 AM CST	Mesoscale Discussion	SPC	Clay, Collin, Cooke, Delta, Denton, Fannin and 8 more	4 hr
Jan 14, 12:49 PM CST	Mesoscale Discussion	SPC	Cooke, Denton, Grayson, Tarrant	3 hr

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.