Alert archive / Texas / Mesoscale Discussions in 2007
Mesoscale Discussion 2242
The Storm Prediction Center issued this mesoscale discussion at Dec 19, 2007, 10:12 PM CST for 5 parishes in Louisiana; 30 counties in Texas. It was in force for 93 min.
The area
The outline as issued.
The facts
- Issued
- Dec 19, 2007, 10:12 PM CST (04:12 UTC)
- Expired
- Dec 19, 2007, 11:45 PM CST
- In force
- 93 min
- Issued by
- the Storm Prediction Center
All 35 counties
Allen Parish, LA, Beauregard Parish, LA, Calcasieu Parish, LA, Sabine Parish, LA, Vernon Parish, LA, Anderson County, TX, Angelina County, TX, Austin County, TX, Brazos County, TX, Chambers County, TX, Cherokee County, TX, Fort Bend County, TX, Grimes County, TX, Hardin County, TX, Harris County, TX, Houston County, TX, Jasper County, TX, Jefferson County, TX, Leon County, TX, Liberty County, TX, Madison County, TX, Montgomery County, TX, Nacogdoches County, TX, Newton County, TX, Orange County, TX, Polk County, TX, Rusk County, TX, Sabine County, TX, San Augustine County, TX, San Jacinto County, TX, Shelby County, TX, Trinity County, TX, Tyler County, TX, Walker County, TX, Waller County, TX
The radar
The Houston radar (KHGX), 141 km from the middle of the area, began a volume at 04:12 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 nearest sounding before it
Lake Charles Mun, LA (KLCH), launched 00:00Z, 4.2 hours before the alert went out and 159 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
- 276 J/kg
- Mixed-layer CIN
- -14 J/kg
- Mixed-layer LCL
- 821 m above ground
- 0-6 km bulk shear
- 56 kt
- 0-1 km storm-relative helicity
- 95 m²/s²
- 0-3 km storm-relative helicity
- 162 m²/s²
- Significant tornado parameter
- 0.1
- Supercell composite
- 0.9
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 |
|---|---|---|---|---|
| Dec 20, 3:30 AM CST | Mesoscale Discussion | SPC | Acadia, Allen, Beauregard, Bienville, Bossier, Caddo and 14 more | 90 min |
| Dec 20, 8:48 AM CST | Mesoscale Discussion | SPC | Acadia, Allen, Ascension, Avoyelles, Beauregard, Calcasieu and 19 more | 57 min |
| Dec 20, 9:15 AM CST | Tornado Watch | SPC | Acadia, Allen, Ascension, Assumption, Avoyelles, Beauregard and 30 more | 7 hr |
| Dec 20, 11:21 AM CST | Mesoscale Discussion | SPC | Acadia, Allen, Ascension, Assumption, Avoyelles, Beauregard and 30 more | 84 min |
| Dec 20, 1:06 PM CST | Mesoscale Discussion | SPC | Ascension, Assumption, East Baton Rouge, East Feliciana, Iberia, Iberville and 21 more | 84 min |
Nearby
Mesoscale Discussions in Texas, 2007Mesoscale Discussions in Louisiana, 2007Every mesoscale discussion in 2007
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.