Alert archive / Texas / Mesoscale Discussions in 2011
Mesoscale Discussion 473
The Storm Prediction Center issued this mesoscale discussion at Apr 19, 2011, 3:45 PM CDT for 30 counties in Texas. It was in force for 60 min.
The area
The outline as issued.
The facts
- Issued
- Apr 19, 2011, 3:45 PM CDT (20:45 UTC)
- Expired
- Apr 19, 2011, 4:45 PM CDT
- In force
- 60 min
- Issued by
- the Storm Prediction Center
All 30 counties
Bastrop County, TX, Bell County, TX, Bexar County, TX, Blanco County, TX, Bosque County, TX, Burleson County, TX, Burnet County, TX, Caldwell County, TX, Comal County, TX, Coryell County, TX, Ellis County, TX, Falls County, TX, Freestone County, TX, Gonzales County, TX, Guadalupe County, TX, Hays County, TX, Henderson County, TX, Hill County, TX, Johnson County, TX, Kendall County, TX, Lampasas County, TX, Lee County, TX, Limestone County, TX, McLennan County, TX, Milam County, TX, Navarro County, TX, Robertson County, TX, Travis County, TX, Williamson County, TX, Wilson County, TX
The radar
The Ft Hood radar (KGRK), 21 km from the middle of the area, began a volume at 20:47 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 12:00Z, 8.8 hours before the alert went out and 252 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
- 3369 J/kg
- Mixed-layer CIN
- -217 J/kg
- Mixed-layer LCL
- 660 m above ground
- 0-6 km bulk shear
- 24 kt
- 0-1 km storm-relative helicity
- 361 m²/s²
- 0-3 km storm-relative helicity
- 398 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 5.1
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 19, 1:40 PM CDT | Mesoscale Discussion | SPC | Collin, Dallas, Delta, Denton, Ellis, Fannin and 10 more | 65 min |
| Apr 19, 2:16 PM CDT | Tornado Watch | SPC | Bowie, Camp, Cass, Collin, Dallas, Delta and 17 more | 10 hr |
| Apr 19, 5:44 PM CDT | Severe Thunderstorm Watch | SPC | Anderson, Bell, Blanco, Bosque, Burnet, Coryell and 19 more | 4 hr |
Nearby
Mesoscale Discussions in Texas, 2011Every mesoscale discussion in 2011
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.