Alert archive / Texas / Mesoscale Discussions in 2013
Mesoscale Discussion 512
The Storm Prediction Center issued this mesoscale discussion at Apr 17, 2013, 11:44 PM CDT for 25 counties in Texas. It was in force for 91 min.
The area
The outline as issued.
The facts
- Issued
- Apr 17, 2013, 11:44 PM CDT (04:44 UTC)
- Expired
- Apr 18, 2013, 1:15 AM CDT
- In force
- 91 min
- Issued by
- the Storm Prediction Center
- Chance of a watch
- 60%
All 25 counties
Archer County, TX, Brown County, TX, Callahan County, TX, Coke County, TX, Coleman County, TX, Concho County, TX, Crockett County, TX, Eastland County, TX, Fisher County, TX, Haskell County, TX, Irion County, TX, Jack County, TX, Jones County, TX, Nolan County, TX, Palo Pinto County, TX, Reagan County, TX, Runnels County, TX, Schleicher County, TX, Shackelford County, TX, Stephens County, TX, Sterling County, TX, Taylor County, TX, Throckmorton County, TX, Tom Green County, TX, Young County, TX
The radar
The Dyess AFB radar (KDYX), 24 km from the middle of the area, began a volume at 04:42 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, 4.7 hours before the alert went out and 210 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
- 790 J/kg
- Mixed-layer CIN
- -89 J/kg
- Mixed-layer LCL
- 1376 m above ground
- 0-6 km bulk shear
- 53 kt
- 0-1 km storm-relative helicity
- 196 m²/s²
- 0-3 km storm-relative helicity
- 329 m²/s²
- Significant tornado parameter
- 0.7
- Supercell composite
- 15.0
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 17, 7:30 PM CDT | Mesoscale Discussion | SPC | Zavala | 90 min |
| Apr 17, 8:36 PM CDT | Mesoscale Discussion | SPC | Archer, Baylor, Clay, Knox, Montague, Wichita and 1 more | 84 min |
| Apr 17, 10:47 PM CDT | Severe Thunderstorm Watch | SPC | Archer, Brown, Callahan, Clay, Coke, Coleman and 32 more | 7 hr |
| Apr 18, 4:29 AM CDT | Mesoscale Discussion | SPC | Bosque, Brown, Coleman, Collin, Comanche, Concho and 20 more | 91 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.