Alert archive / Texas / Mesoscale Discussions in 2003

Mesoscale Discussion 2451

October 25, 20039 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Oct 25, 2003, 7:30 AM CDT for 9 counties in Texas. It was in force for 90 min.

The area

The outline as issued.

The facts

Issued: Oct 25, 2003, 7:30 AM CDT (12:30 UTC)
Expired: Oct 25, 2003, 9:00 AM CDT
In force: 90 min
Issued by: the Storm Prediction Center

Counties Aransas County, TX, Brazoria County, TX, Calhoun County, TX, Chambers County, TX, Fort Bend County, TX, Galveston County, TX, Jackson County, TX, Jefferson County, TX, Matagorda County, TX

The radar

The Houston radar (KHGX), 116 km from the middle of the area, began a volume at 12:31 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.

Severe Thunderstorm Watch 938Oct 25, 9:45 AM CDT

The nearest sounding before it

Corpus Christi, TX (KCRP), launched 12:00Z, 0.5 hours before the alert went out and 179 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: 1994 J/kg
Mixed-layer CIN: -10 J/kg
Mixed-layer LCL: 725 m above ground
0-6 km bulk shear: 28 kt
0-1 km storm-relative helicity: 100 m²/s²
0-3 km storm-relative helicity: 208 m²/s²
Significant tornado parameter: 0.9
Supercell composite: 6.2

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
Oct 25, 9:17 AM CDT	Mesoscale Discussion	SPC	Hardin, Jasper, Jefferson, Liberty, Newton, Orange and 3 more	118 min
Oct 25, 9:45 AM CDT	Severe Thunderstorm Watch	SPC	Chambers, Hardin, Jasper, Jefferson, Newton, Orange and 1 more	5 hr
Oct 25, 12:19 PM CDT	Mesoscale Discussion	SPC	Angelina, Austin, Brazoria, Chambers, Colorado, Fort Bend and 20 more	56 min
Oct 25, 1:20 PM CDT	Mesoscale Discussion	SPC	Aransas, Austin, Bee, Colorado, DeWitt, Fayette and 13 more	85 min
Oct 25, 5:21 PM CDT	Mesoscale Discussion	SPC	Atascosa, Austin, Bee, Burleson, Colorado, DeWitt and 14 more	84 min

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.