Alert archive / Texas / Mesoscale Discussions in 2015
Mesoscale Discussion 476
The Storm Prediction Center issued this mesoscale discussion at Apr 27, 2015, 12:49 AM CDT for 55 counties in Texas. It was in force for 86 min.
The area
The outline as issued.
The facts
- Issued
- Apr 27, 2015, 12:49 AM CDT (05:49 UTC)
- Expired
- Apr 27, 2015, 2:15 AM CDT
- In force
- 86 min
- Issued by
- the Storm Prediction Center
- Chance of a watch
- 80%
All 55 counties
Anderson County, TX, Angelina County, TX, Atascosa County, TX, Austin County, TX, Bastrop County, TX, Bexar County, TX, Brazos County, TX, Burleson County, TX, Caldwell County, TX, Cherokee County, TX, Colorado County, TX, DeWitt County, TX, Fayette County, TX, Fort Bend County, TX, Freestone County, TX, Goliad County, TX, Gonzales County, TX, Gregg County, TX, Grimes County, TX, Guadalupe County, TX, Hardin County, TX, Harris County, TX, Henderson County, TX, Houston County, TX, Jackson County, TX, Jasper County, TX, Karnes County, TX, Lavaca County, TX, Lee County, TX, Leon County, TX, Liberty County, TX, Limestone County, TX, Madison County, TX, Milam County, TX, Montgomery County, TX, Nacogdoches County, TX, Newton County, TX, Panola County, TX, Polk County, TX, Robertson County, TX, Rusk County, TX, Sabine County, TX, San Augustine County, TX, San Jacinto County, TX, Shelby County, TX, Smith County, TX, Trinity County, TX, Tyler County, TX, Van Zandt County, TX, Victoria County, TX, Walker County, TX, Waller County, TX, Washington County, TX, Wharton County, TX, Wilson County, TX
The radar
The Ft Hood radar (KGRK), 115 km from the middle of the area, began a volume at 05:53 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
Fort Worth, TX (KFWD), launched 00:00Z, 5.8 hours before the alert went out and 235 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
- 1199 J/kg
- Mixed-layer CIN
- -82 J/kg
- Mixed-layer LCL
- 1646 m above ground
- 0-6 km bulk shear
- 59 kt
- 0-1 km storm-relative helicity
- 68 m²/s²
- 0-3 km storm-relative helicity
- 248 m²/s²
- Significant tornado parameter
- 0.1
- Supercell composite
- 3.3
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, 7:10 PM CDT | Mesoscale Discussion | SPC | Archer, Baylor, Carson, Childress, Clay, Collingsworth and 14 more | 65 min |
| Apr 26, 7:59 PM CDT | Severe Thunderstorm Watch | SPC | Bandera, Bexar, Blanco, Brown, Burnet, Coleman and 24 more | 6 hr |
| Apr 26, 9:29 PM CDT | Mesoscale Discussion | SPC | Dallas, Ellis, Hood, Hunt, Johnson, Kaufman and 4 more | 91 min |
| Apr 26, 10:45 PM CDT | Tornado Watch | SPC | Anderson, Bell, Bosque, Comanche, Coryell, Ellis and 19 more | 5 hr |
| Apr 27, 1:27 AM CDT | Tornado Watch | SPC | Angelina, Atascosa, Austin, Bastrop, Bee, Brazos and 50 more | 6 hr |
| Apr 27, 3:42 AM CDT | Mesoscale Discussion | SPC | Archer, Baylor, Clay, Cooke, Denton, Foard and 12 more | 93 min |
| Apr 27, 4:56 AM CDT | Mesoscale Discussion | SPC | Angelina, Chambers, Hardin, Harris, Jasper, Jefferson and 13 more | 2 hr |
| Apr 27, 5:25 AM CDT | Mesoscale Discussion | SPC | Brooks, Kenedy | 95 min |
| Apr 27, 6:01 AM CDT | Tornado Watch | SPC | Jefferson, Orange | 7 hr |
| Apr 27, 1:08 PM CDT | Mesoscale Discussion | SPC | Angelina, Chambers, Hardin, Jasper, Jefferson, Liberty and 9 more | 97 min |
| Apr 27, 3:29 PM CDT | Mesoscale Discussion | SPC | Austin, Bastrop, Bell, Bosque, Brazos, Burleson and 22 more | 91 min |
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.