Alert archive / Texas / Mesoscale Discussions in 2017
Mesoscale Discussion 1573
The Storm Prediction Center issued this mesoscale discussion at Aug 26, 2017, 11:20 AM CDT for 31 counties in Texas. It was in force for 115 min.
The area
The outline as issued.
The facts
- Issued
- Aug 26, 2017, 11:20 AM CDT (16:20 UTC)
- Expired
- Aug 26, 2017, 1:15 PM CDT
- In force
- 115 min
- Issued by
- the Storm Prediction Center
All 31 counties
Austin County, TX, Bastrop County, TX, Brazoria County, TX, Brazos County, TX, Burleson County, TX, Chambers County, TX, Colorado County, TX, Fayette County, TX, Fort Bend County, TX, Galveston County, TX, Grimes County, TX, Hardin County, TX, Harris County, TX, Jackson County, TX, Jasper County, TX, Jefferson County, TX, Lavaca County, TX, Lee County, TX, Liberty County, TX, Madison 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, Waller County, TX, Washington County, TX, Wharton County, TX
The radar
The Houston radar (KHGX), 72 km from the middle of the area, began a volume at 16:21 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, 4.3 hours before the alert went out and 242 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
- 2221 J/kg
- Mixed-layer CIN
- -10 J/kg
- Mixed-layer LCL
- 512 m above ground
- 0-6 km bulk shear
- 30 kt
- 0-1 km storm-relative helicity
- 241 m²/s²
- 0-3 km storm-relative helicity
- 305 m²/s²
- Significant tornado parameter
- 1.9
- Supercell composite
- 13.5
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 25, 7:36 PM CDT | Mesoscale Discussion | SPC | Aransas, Brazoria, Calhoun, Chambers, Fort Bend, Galveston and 8 more | 114 min |
| Aug 25, 11:30 PM CDT | Mesoscale Discussion | SPC | Aransas, Brazoria, Calhoun, Chambers, Fort Bend, Galveston and 8 more | 2 hr |
| Aug 26, 1:17 AM CDT | Mesoscale Discussion | SPC | Galveston | 28 min |
| Aug 26, 1:48 AM CDT | Tornado Watch | SPC | Austin, Brazoria, Brazos, Burleson, Chambers, Colorado and 17 more | 11 hr |
| Aug 26, 6:49 AM CDT | Mesoscale Discussion | SPC | Chambers, Galveston, Harris | 116 min |
| Aug 26, 12:50 PM CDT | Tornado Watch | SPC | Austin, Brazoria, Chambers, Colorado, Fort Bend, Galveston and 13 more | 13 hr |
| Aug 26, 3:44 PM CDT | Mesoscale Discussion | SPC | Austin, Brazoria, Brazos, Chambers, Colorado, Fort Bend and 19 more | 61 min |
| Aug 26, 6:00 PM CDT | Mesoscale Discussion | SPC | Austin, Brazoria, Chambers, Colorado, Fort Bend, Galveston and 17 more | 2 hr |
Nearby
Mesoscale Discussions in Texas, 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.