Alert archive / Texas / Mesoscale Discussions in 2013
Mesoscale Discussion 564
The Storm Prediction Center issued this mesoscale discussion at Apr 27, 2013, 3:36 PM CDT for 29 counties in Texas. It was in force for 84 min.
The area
The outline as issued.
The facts
- Issued
- Apr 27, 2013, 3:36 PM CDT (20:36 UTC)
- Expired
- Apr 27, 2013, 5:00 PM CDT
- In force
- 84 min
- Issued by
- the Storm Prediction Center
- Chance of a watch
- 60%
All 29 counties
Bandera County, TX, Bastrop County, TX, Bexar County, TX, Blanco County, TX, Brazos County, TX, Burleson County, TX, Caldwell County, TX, Comal County, TX, Edwards County, TX, Fayette County, TX, Gillespie County, TX, Grimes County, TX, Guadalupe County, TX, Hays County, TX, Kendall County, TX, Kerr County, TX, Kinney County, TX, Lee County, TX, Madison County, TX, Medina County, TX, Milam County, TX, Real County, TX, Robertson County, TX, Travis County, TX, Uvalde County, TX, Val Verde County, TX, Walker County, TX, Washington County, TX, Williamson County, TX
The radar
The Austin/San Antonio radar (KEWX), 69 km from the middle of the area, began a volume at 20:39 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
Del Rio, TX (KDRT), launched 12:00Z, 8.6 hours before the alert went out and 223 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
- 2124 J/kg
- Mixed-layer CIN
- -137 J/kg
- Mixed-layer LCL
- 506 m above ground
- 0-6 km bulk shear
- 44 kt
- 0-1 km storm-relative helicity
- 85 m²/s²
- 0-3 km storm-relative helicity
- 52 m²/s²
- Significant tornado parameter
- 0.4
- Supercell composite
- 2.7
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 27, 5:05 PM CDT | Severe Thunderstorm Watch | SPC | Atascosa, Austin, Bandera, Bastrop, Bell, Bexar and 52 more | 8 hr |
| Apr 27, 6:11 PM CDT | Mesoscale Discussion | SPC | Brewster, Terrell | 3 hr |
| Apr 27, 6:43 PM CDT | Mesoscale Discussion | SPC | Atascosa, Austin, Bandera, Bastrop, Bexar, Blanco and 55 more | 2 hr |
| Apr 27, 6:54 PM CDT | Mesoscale Discussion | SPC | Nacogdoches, Panola, Shelby | 66 min |
Nearby
Mesoscale Discussions in Texas, 2013Every mesoscale discussion in 2013
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.