Alert archive / Texas / Mesoscale Discussions in 2003

Mesoscale Discussion 1852

July 15, 20039 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Jul 15, 2003, 7:57 AM CDT for 9 counties in Texas. It was in force for 4 hr.

The area

The outline as issued.

The facts

Issued: Jul 15, 2003, 7:57 AM CDT (12:57 UTC)
Expired: Jul 15, 2003, 12:00 PM CDT
In force: 4 hr
Issued by: the Storm Prediction Center

Counties Brazoria County, TX, Chambers County, TX, Fort Bend County, TX, Galveston County, TX, Hardin County, TX, Jackson County, TX, Jefferson County, TX, Matagorda County, TX, Wharton County, TX

The nearest sounding before it

Corpus Christi, TX (KCRP), launched 12:00Z, 1.0 hours before the alert went out and 240 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: 403 J/kg
Mixed-layer CIN: -39 J/kg
Mixed-layer LCL: 983 m above ground
0-6 km bulk shear: 22 kt
0-1 km storm-relative helicity: 68 m²/s²
0-3 km storm-relative helicity: 136 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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
Jul 15, 1:41 AM CDT	Mesoscale Discussion	SPC	Austin, Brazoria, Chambers, Colorado, Fort Bend, Galveston and 4 more	3 hr
Jul 15, 6:40 AM CDT	Tornado Watch	SPC	Brazoria, Chambers, Fort Bend, Galveston, Hardin, Harris and 4 more	6 hr
Jul 15, 9:48 AM CDT	Mesoscale Discussion	SPC	Brazoria, Calhoun, Colorado, DeWitt, Fort Bend, Goliad and 8 more	117 min
Jul 15, 12:05 PM CDT	Tornado Watch	SPC	Aransas, Brazoria, Calhoun, Chambers, Fort Bend, Galveston and 8 more	7 hr
Jul 15, 3:00 PM CDT	Tornado Watch	SPC	Atascosa, Bee, DeWitt, Frio, Goliad, Jackson and 7 more	7 hr

Nearby

Mesoscale Discussions in Texas, 2003 Every mesoscale discussion in 2003

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.