Alert archive / Texas / Mesoscale Discussions in 2017
Mesoscale Discussion 1587
The Storm Prediction Center issued this mesoscale discussion at Aug 27, 2017, 3:07 PM CDT for 8 parishes in Louisiana; 11 counties in Texas. It was in force for 113 min.
The area
The outline as issued.
The facts
- Issued
- Aug 27, 2017, 3:07 PM CDT (20:07 UTC)
- Expired
- Aug 27, 2017, 5:00 PM CDT
- In force
- 113 min
- Issued by
- the Storm Prediction Center
Counties Acadia Parish, LA, Calcasieu Parish, LA, Cameron Parish, LA, Iberia Parish, LA, Jefferson Davis Parish, LA, Lafayette Parish, LA, St. Mary Parish, LA, Vermilion Parish, LA, Brazoria County, TX, Chambers County, TX, Fort Bend County, TX, Galveston County, TX, Hardin County, TX, Harris County, TX, Jefferson County, TX, Liberty County, TX, Matagorda County, TX, Orange County, TX, Waller County, TX
The radar
The Lake Charles radar (KLCH), 79 km from the middle of the area, began a volume at 20:11 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 12:00Z, 8.1 hours before the alert went out and 80 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
- 323 J/kg
- Mixed-layer CIN
- -83 J/kg
- Mixed-layer LCL
- 934 m above ground
- 0-6 km bulk shear
- 31 kt
- 0-1 km storm-relative helicity
- 181 m²/s²
- 0-3 km storm-relative helicity
- 193 m²/s²
- Significant tornado parameter
- 0.2
- Supercell composite
- 2.0
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 |
|---|---|---|---|---|
| Aug 27, 10:54 AM CDT | Mesoscale Discussion | SPC | Beauregard, Calcasieu, Cameron, Jefferson Davis | 3 hr |
| Aug 27, 12:40 PM CDT | Tornado Watch | SPC | Acadia, Calcasieu, Cameron, Jefferson Davis, Vermilion | 13 hr |
| Aug 27, 6:04 PM CDT | Mesoscale Discussion | SPC | Acadia, Calcasieu, Cameron, Jefferson Davis, Vermilion | 116 min |
| Aug 26, 9:37 PM CDT | Mesoscale Discussion | SPC | Austin, Brazoria, Chambers, Colorado, Fort Bend, Galveston and 14 more | 113 min |
| Aug 27, 1:50 AM CDT | Tornado Watch | SPC | Austin, Brazoria, Chambers, Fort Bend, Galveston, Harris and 5 more | 11 hr |
| Aug 27, 4:04 AM CDT | Mesoscale Discussion | SPC | Brazoria, Chambers, Fort Bend, Galveston, Harris, Jefferson and 2 more | 56 min |
| Aug 27, 1:57 PM CDT | Mesoscale Discussion | SPC | Armstrong, Briscoe, Carson, Castro, Childress, Collingsworth and 17 more | 3 hr |
| Aug 27, 3:27 PM CDT | Severe Thunderstorm Watch | SPC | Armstrong, Carson, Collingsworth, Donley, Gray, Hansford and 10 more | 8 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.