Alert archive / Texas / Mesoscale Discussions in 2017
Mesoscale Discussion 1581
The Storm Prediction Center issued this mesoscale discussion at Aug 26, 2017, 9:37 PM CDT for 20 counties in Texas. It was in force for 113 min.
The area
The outline as issued.
The facts
- Issued
- Aug 26, 2017, 9:37 PM CDT (02:37 UTC)
- Expired
- Aug 26, 2017, 11:30 PM CDT
- In force
- 113 min
- Issued by
- the Storm Prediction Center
Counties Austin County, TX, Brazoria County, TX, Chambers County, TX, Colorado 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, Waller County, TX, Wharton County, TX
The radar
The Houston radar (KHGX), 34 km from the middle of the area, began a volume at 02:37 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
Corpus Christi, TX (KCRP), launched 00:00Z, 2.6 hours before the alert went out and 316 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
- 104 J/kg
- Mixed-layer CIN
- -81 J/kg
- Mixed-layer LCL
- 905 m above ground
- 0-6 km bulk shear
- 22 kt
- 0-1 km storm-relative helicity
- 38 m²/s²
- 0-3 km storm-relative helicity
- 50 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 |
|---|---|---|---|---|
| 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, 10:54 AM CDT | Mesoscale Discussion | SPC | Austin, Brazoria, Chambers, Colorado, Fort Bend, Galveston and 14 more | 3 hr |
| Aug 27, 12:40 PM CDT | Tornado Watch | SPC | Brazoria, Chambers, Fort Bend, Galveston, Hardin, Harris and 3 more | 13 hr |
| Aug 27, 1:57 PM CDT | Mesoscale Discussion | SPC | Armstrong, Briscoe, Carson, Castro, Childress, Collingsworth and 17 more | 3 hr |
| Aug 27, 3:07 PM CDT | Mesoscale Discussion | SPC | Brazoria, Chambers, Fort Bend, Galveston, Hardin, Harris and 5 more | 113 min |
| Aug 27, 3:27 PM CDT | Severe Thunderstorm Watch | SPC | Armstrong, Carson, Collingsworth, Donley, Gray, Hansford and 10 more | 8 hr |
| Aug 27, 6:04 PM CDT | Mesoscale Discussion | SPC | Brazoria, Chambers, Fort Bend, Galveston, Hardin, Harris and 3 more | 116 min |
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.