Alert archive / Texas / Mesoscale Discussions in 2003
Mesoscale Discussion 1772
The Storm Prediction Center issued this mesoscale discussion at Jul 11, 2003, 11:46 AM CDT for 21 counties in Texas. It was in force for 119 min.
The area
The outline as issued.
The facts
- Issued
- Jul 11, 2003, 11:46 AM CDT (16:46 UTC)
- Expired
- Jul 11, 2003, 1:45 PM CDT
- In force
- 119 min
- Issued by
- the Storm Prediction Center
All 21 counties
Angelina County, TX, Austin County, TX, Brazos County, TX, Chambers County, TX, Fort Bend County, TX, Grimes County, TX, Hardin County, TX, Harris County, TX, Houston County, TX, Leon County, TX, Liberty County, TX, Madison County, TX, Montgomery County, TX, Orange County, TX, Polk County, TX, San Jacinto County, TX, Trinity County, TX, Tyler County, TX, Walker County, TX, Waller County, TX, Washington County, TX
The radar
The Houston radar (KHGX), 145 km from the middle of the area, began a volume at 16:46 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
Lake Charles Mun, LA (KLCH), launched 12:00Z, 4.8 hours before the alert went out and 231 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
- 1960 J/kg
- Mixed-layer CIN
- -11 J/kg
- Mixed-layer LCL
- 802 m above ground
- 0-6 km bulk shear
- 8 kt
- 0-1 km storm-relative helicity
- -12 m²/s²
- 0-3 km storm-relative helicity
- 36 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
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 |
|---|---|---|---|---|
| Jul 11, 2:00 PM CDT | Severe Thunderstorm Watch | SPC | Bastrop, Bell, Brazos, Burleson, Burnet, Caldwell and 14 more | 5 hr |
| Jul 11, 4:38 PM CDT | Mesoscale Discussion | SPC | Armstrong, Bailey, Briscoe, Carson, Castro, Collingsworth and 22 more | 97 min |
| Jul 11, 5:25 PM CDT | Severe Thunderstorm Watch | SPC | Armstrong, Bailey, Carson, Castro, Cochran, Dallam and 17 more | 6 hr |
| Jul 11, 6:15 PM CDT | Mesoscale Discussion | SPC | Bastrop, Bell, Brazos, Burleson, Burnet, Caldwell and 14 more | 60 min |
Nearby
Mesoscale Discussions in Texas, 2003Every 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.