Alert archive / Texas / Mesoscale Discussions in 2016

Mesoscale Discussion 506

April 29, 201635 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Apr 29, 2016, 8:07 PM CDT for 35 counties in Texas. It was in force for 83 min.

The area

The outline as issued.

The facts

Issued
Apr 29, 2016, 8:07 PM CDT (01:07 UTC)
Expired
Apr 29, 2016, 9:30 PM CDT
In force
83 min
Issued by
the Storm Prediction Center
All 35 counties

Bandera County, TX, 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, Edwards County, TX, Falls County, TX, Gillespie County, TX, Guadalupe County, TX, Hamilton County, TX, Hays County, TX, Hill County, TX, Kendall County, TX, Kerr County, TX, Lampasas County, TX, Lee County, TX, Limestone County, TX, Llano County, TX, Mason County, TX, McLennan County, TX, Medina County, TX, Milam County, TX, Mills County, TX, Real County, TX, Robertson County, TX, San Saba County, TX, Travis County, TX, Uvalde County, TX, Williamson County, TX

The radar

The Austin/San Antonio radar (KEWX), 117 km from the middle of the area, began a volume at 01:06 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 (KDLF), launched 00:00Z, 1.1 hours before the alert went out and 231 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.

Skew-T log-pSkew-T log-p diagram, Del Rio, TX at 00:00Z on 2016-04-30Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1523 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Del Rio, TX at 00:00Z on 2016-04-30The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -68 square meters per square second.1939587897Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
1523 J/kg
Mixed-layer CIN
-48 J/kg
Mixed-layer LCL
1775 m above ground
0-6 km bulk shear
57 kt
0-1 km storm-relative helicity
-68 m²/s²
0-3 km storm-relative helicity
-49 m²/s²
Significant tornado parameter
-0.3
Supercell composite
-8.5

Open this sounding in Storm Lab

The text

As transmitted.

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SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Apr 29, 8:20 PM CDTSevere Thunderstorm WatchSPCBandera, Bastrop, Bexar, Blanco, Burnet, Caldwell and 19 more9 hr
Apr 29, 8:56 PM CDTMesoscale DiscussionSPCAnderson, Angelina, Bowie, Brazos, Burleson, Camp and 34 more94 min
Apr 29, 9:58 PM CDTSevere Thunderstorm WatchSPCAnderson, Angelina, Bell, Bowie, Brazos, Burleson and 47 more7 hr
Apr 29, 11:42 PM CDTMesoscale DiscussionSPCBowie, Camp, Cass, Gregg, Harrison, Marion and 4 more93 min
Apr 30, 1:46 AM CDTMesoscale DiscussionSPCBandera, Bexar, Blanco, Comal, Hays, Kendall and 3 more59 min
Apr 30, 3:23 AM CDTMesoscale DiscussionSPCHardin, Harris, Jasper, Jefferson, Liberty, Newton and 7 more97 min
Apr 30, 5:11 AM CDTSevere Thunderstorm WatchSPCHardin, Jasper, Jefferson, Newton, Orange, Sabine and 1 more9 hr
Apr 30, 5:12 AM CDTMesoscale DiscussionSPCAustin, Burleson, Colorado, Fayette, Grimes, Harris and 7 more93 min
Apr 30, 5:27 AM CDTSevere Thunderstorm WatchSPCAustin, Brazoria, Brazos, Burleson, Chambers, Colorado and 11 more6 hr
Apr 30, 7:38 AM CDTMesoscale DiscussionSPCChambers, Fort Bend, Hardin, Harris, Jefferson, Liberty and 1 more67 min

Nearby

Mesoscale Discussions in Texas, 2016Every mesoscale discussion in 2016

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.