Alert archive / Texas / Mesoscale Discussions in 2004
Mesoscale Discussion 464
The Storm Prediction Center issued this mesoscale discussion at Apr 24, 2004, 3:00 AM CDT for 24 counties in Texas. It was in force for 60 min.
The area
The outline as issued.
The facts
- Issued
- Apr 24, 2004, 3:00 AM CDT (08:00 UTC)
- Expired
- Apr 24, 2004, 4:00 AM CDT
- In force
- 60 min
- Issued by
- the Storm Prediction Center
All 24 counties
Aransas County, TX, Austin County, TX, Brazoria County, TX, Calhoun County, TX, Chambers County, TX, Colorado County, TX, Fayette County, TX, Fort Bend County, TX, Galveston County, TX, Grimes County, TX, Hardin County, TX, Harris County, TX, Jackson County, TX, Jefferson County, TX, Lavaca County, TX, Liberty County, TX, Matagorda County, TX, Montgomery County, TX, Refugio County, TX, San Jacinto County, TX, Victoria County, TX, Waller County, TX, Washington County, TX, Wharton County, TX
The radar
The Houston radar (KHGX), 108 km from the middle of the area, began a volume at 07:59 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.
The nearest sounding before it
Corpus Christi, TX (KCRP), launched 00:00Z, 8.0 hours before the alert went out and 192 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.
- Mixed-layer CAPE
- 2567 J/kg
- Mixed-layer CIN
- -20 J/kg
- Mixed-layer LCL
- 663 m above ground
- 0-6 km bulk shear
- 19 kt
- 0-1 km storm-relative helicity
- 32 m²/s²
- 0-3 km storm-relative helicity
- 74 m²/s²
- Significant tornado parameter
- 0.3
- Supercell composite
- 2.3
The text
As transmitted, in the capitals the NWS used until 2016.
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</html>SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 23, 7:48 PM CDT | Mesoscale Discussion | SPC | Archer, Baylor, Brown, Callahan, Clay, Coke and 29 more | 87 min |
| Apr 23, 9:18 PM CDT | Mesoscale Discussion | SPC | Brown, Callahan, Clay, Coke, Coleman, Comanche and 20 more | 57 min |
| Apr 23, 11:08 PM CDT | Mesoscale Discussion | SPC | Brown, Callahan, Coleman, Comanche, Cooke, Denton and 9 more | 37 min |
| Apr 24, 12:28 AM CDT | Mesoscale Discussion | SPC | Atascosa, Austin, Bastrop, Bee, Bexar, Burleson and 25 more | 92 min |
| Apr 24, 12:50 AM CDT | Severe Thunderstorm Watch | SPC | Aransas, Atascosa, Austin, Bastrop, Bee, Caldwell and 27 more | 5 hr |
| Apr 24, 3:45 AM CDT | Severe Thunderstorm Watch | SPC | Austin, Brazoria, Calhoun, Chambers, Colorado, Fayette and 21 more | 5 hr |
Nearby
Mesoscale Discussions in Texas, 2004Every mesoscale discussion in 2004
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.