Alert archive / Texas / Mesoscale Discussions in 2015
Mesoscale Discussion 470
The Storm Prediction Center issued this mesoscale discussion at Apr 26, 2015, 5:24 PM CDT for 6 counties in Texas. It was in force for 96 min.
The area
The outline as issued.
The facts
- Issued
- Apr 26, 2015, 5:24 PM CDT (22:24 UTC)
- Expired
- Apr 26, 2015, 7:00 PM CDT
- In force
- 96 min
- Issued by
- the Storm Prediction Center
- Chance of a watch
- 60%
Counties Brazoria County, TX, Chambers County, TX, Fort Bend County, TX, Galveston County, TX, Harris County, TX, Wharton County, TX
The radar
The Houston radar (KHGX), 49 km from the middle of the area, began a volume at 22:26 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
Corpus Christi, TX (KCRP), launched 12:00Z, 10.4 hours before the alert went out and 262 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
- 930 J/kg
- Mixed-layer CIN
- -334 J/kg
- Mixed-layer LCL
- 1354 m above ground
- 0-6 km bulk shear
- 53 kt
- 0-1 km storm-relative helicity
- 24 m²/s²
- 0-3 km storm-relative helicity
- 181 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.6
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 |
|---|---|---|---|---|
| Apr 26, 10:55 AM CDT | Mesoscale Discussion | SPC | Archer, Baylor, Bosque, Brown, Callahan, Clay and 30 more | 2 hr |
| Apr 26, 1:06 PM CDT | Tornado Watch | SPC | Archer, Baylor, Brown, Callahan, Childress, Clay and 27 more | 7 hr |
| Apr 26, 2:04 PM CDT | Mesoscale Discussion | SPC | Collingsworth | 2 hr |
| Apr 26, 2:52 PM CDT | Severe Thunderstorm Watch | SPC | Collingsworth, Donley, Wheeler | 5 hr |
| Apr 26, 2:54 PM CDT | Mesoscale Discussion | SPC | Archer, Baylor, Brown, Callahan, Clay, Coleman and 27 more | 2 hr |
| Apr 26, 3:18 PM CDT | Mesoscale Discussion | SPC | Armstrong, Carson, Dallam, Hartley, Moore, Potter | 117 min |
| Apr 26, 4:54 PM CDT | Tornado Watch | SPC | Bell, Bosque, Comanche, Coryell, Dallas, Eastland and 17 more | 6 hr |
| Apr 26, 5:39 PM CDT | Tornado Watch | SPC | Brazoria, Fort Bend, Galveston, Harris, Jackson, Matagorda and 1 more | 2 hr |
| Apr 26, 5:51 PM CDT | Mesoscale Discussion | SPC | Brown, Coleman, Comanche, Eastland, Erath, Hamilton | 84 min |
| Apr 26, 6:44 PM CDT | Mesoscale Discussion | SPC | Brown, Coleman, Concho, Kimble, McCulloch, Mason and 2 more | 2 hr |
Nearby
Mesoscale Discussions in Texas, 2015Every mesoscale discussion in 2015
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.