Alert archive / Texas / Mesoscale Discussions in 2004
Mesoscale Discussion 2420
The Storm Prediction Center issued this mesoscale discussion at Nov 22, 2004, 6:18 AM CST for 25 counties in Texas. It was in force for 87 min.
The area
The outline as issued.
The facts
- Issued
- Nov 22, 2004, 6:18 AM CST (12:18 UTC)
- Expired
- Nov 22, 2004, 7:45 AM CST
- In force
- 87 min
- Issued by
- the Storm Prediction Center
All 25 counties
Austin County, TX, Bastrop County, TX, Bexar County, TX, Caldwell County, TX, Chambers County, TX, Colorado County, TX, Comal County, TX, Fayette County, TX, Fort Bend County, TX, Gonzales County, TX, Grimes County, TX, Guadalupe County, TX, Hardin County, TX, Harris County, TX, Hays County, TX, Kendall County, TX, Lavaca County, TX, Lee County, TX, Liberty County, TX, Montgomery County, TX, San Jacinto County, TX, Waller County, TX, Washington County, TX, Wharton County, TX, Wilson County, TX
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 12:00Z, 0.3 hours before the alert went out and 239 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
- 1000 J/kg
- Mixed-layer CIN
- -12 J/kg
- Mixed-layer LCL
- 687 m above ground
- 0-6 km bulk shear
- 30 kt
- 0-1 km storm-relative helicity
- 72 m²/s²
- 0-3 km storm-relative helicity
- 107 m²/s²
- Significant tornado parameter
- 0.3
- Supercell composite
- 2.8
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 |
|---|---|---|---|---|
| Nov 22, 9:10 AM CST | Tornado Watch | SPC | Austin, Bexar, Caldwell, Chambers, Colorado, DeWitt and 17 more | 5 hr |
| Nov 22, 10:49 AM CST | Mesoscale Discussion | SPC | Atascosa, Austin, Bexar, Brazoria, Chambers, Colorado and 21 more | 116 min |
| Nov 22, 12:56 PM CST | Mesoscale Discussion | SPC | Atascosa, Austin, Bexar, Brazoria, Chambers, Colorado and 20 more | 64 min |
| Nov 22, 1:35 PM CST | Tornado Watch | SPC | Austin, Bexar, Caldwell, Chambers, Colorado, DeWitt and 16 more | 5 hr |
| Nov 22, 3:31 PM CST | Mesoscale Discussion | SPC | El Paso, Hudspeth | 2 hr |
| Nov 22, 3:34 PM CST | Mesoscale Discussion | SPC | Austin, Bee, Brazoria, Calhoun, Chambers, Colorado and 18 more | 116 min |
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.