Alert archive / Texas / Mesoscale Discussions in 2017
Mesoscale Discussion 179
The Storm Prediction Center issued this mesoscale discussion at Feb 14, 2017, 7:21 AM CST for 9 parishes in Louisiana; 18 counties in Texas. It was in force for 114 min.
The area
The outline as issued.
The facts
- Issued
- Feb 14, 2017, 7:21 AM CST (13:21 UTC)
- Expired
- Feb 14, 2017, 9:15 AM CST
- In force
- 114 min
- Issued by
- the Storm Prediction Center
All 27 counties
Acadia Parish, LA, Allen Parish, LA, Beauregard Parish, LA, Calcasieu Parish, LA, Cameron Parish, LA, Evangeline Parish, LA, Jefferson Davis Parish, LA, Vermilion Parish, LA, Vernon Parish, LA, Brazoria County, TX, Calhoun County, TX, Chambers County, TX, Fort Bend County, TX, Galveston County, TX, Hardin County, TX, Harris County, TX, Jasper County, TX, Jefferson County, TX, Liberty County, TX, Matagorda County, TX, Montgomery County, TX, Newton County, TX, Orange County, TX, Polk County, TX, San Jacinto County, TX, Tyler County, TX, Walker County, TX
The radar
The Houston radar (KHGX), 18 km from the middle of the area, began a volume at 13:25 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, 1.4 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.
- Mixed-layer CAPE
- 22 J/kg
- Mixed-layer CIN
- -294 J/kg
- Mixed-layer LCL
- 644 m above ground
- 0-6 km bulk shear
- 40 kt
- 0-1 km storm-relative helicity
- 137 m²/s²
- 0-3 km storm-relative helicity
- 227 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
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</html>SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Feb 14, 9:38 AM CST | Tornado Watch | SPC | Acadia, Allen, Beauregard, Calcasieu, Cameron, Evangeline and 5 more | 5 hr |
| Feb 14, 11:15 AM CST | Mesoscale Discussion | SPC | Acadia, Allen, Beauregard, Calcasieu, Cameron, Jefferson Davis and 2 more | 90 min |
| Feb 14, 2:02 PM CST | Mesoscale Discussion | SPC | Ascension, Assumption, Avoyelles, Catahoula, Concordia, East Baton Rouge and 20 more | 2 hr |
| Feb 13, 8:24 PM CST | Mesoscale Discussion | SPC | Bandera, Kerr, Llano, McCulloch, Mason, San Saba | 96 min |
| Feb 14, 3:57 AM CST | Mesoscale Discussion | SPC | Atascosa, Austin, Bee, Bexar, Brazoria, Colorado and 16 more | 3 hr |
| Feb 14, 5:09 AM CST | Tornado Watch | SPC | Aransas, Austin, Bee, Brazoria, Calhoun, Chambers and 24 more | 6 hr |
Nearby
Mesoscale Discussions in Texas, 2017Mesoscale Discussions in Louisiana, 2017Every mesoscale discussion in 2017
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.