Alert archive / Texas / Mesoscale Discussions in 2003

Mesoscale Discussion 1853

July 15, 200314 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Jul 15, 2003, 9:48 AM CDT for 14 counties in Texas. It was in force for 117 min.

The area

The outline as issued.

The facts

Issued: Jul 15, 2003, 9:48 AM CDT (14:48 UTC)
Expired: Jul 15, 2003, 11:45 AM CDT
In force: 117 min
Issued by: the Storm Prediction Center

Counties Brazoria County, TX, Calhoun County, TX, Colorado County, TX, DeWitt County, TX, Fort Bend County, TX, Goliad County, TX, Gonzales County, TX, Jackson County, TX, Karnes County, TX, Lavaca County, TX, Matagorda County, TX, Refugio County, TX, Victoria County, TX, Wharton County, TX

The radar

The Austin/San Antonio radar (KEWX), 138 km from the middle of the area, began a volume at 14:48 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.

Tornado Watch 751Jul 15, 12:05 PM CDT

The nearest sounding before it

Corpus Christi, TX (KCRP), launched 12:00Z, 2.8 hours before the alert went out and 146 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, 7:57 AM CDT	Mesoscale Discussion	SPC	Brazoria, Chambers, Fort Bend, Galveston, Hardin, Jackson and 3 more	4 hr
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; radar from the NEXRAD Level II archive.