Alert archive / Texas / Mesoscale Discussions in 2017

Mesoscale Discussion 394

April 1, 2017Val Verde County, Texas

The Storm Prediction Center issued this mesoscale discussion at Apr 1, 2017, 7:20 PM CDT for Val Verde County, Texas. It was in force for 85 min.

The area

The outline as issued.

The facts

Issued
Apr 1, 2017, 7:20 PM CDT (00:20 UTC)
Expired
Apr 1, 2017, 8:45 PM CDT
In force
85 min
Issued by
the Storm Prediction Center
Chance of a watch
20%

County Val Verde County, TX

The radar

The Laughlin AFB radar (KDFX), 101 km from the middle of the area, began a volume at 00:19 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, 0.3 hours before the alert went out and 53 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 2017-04-02Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 564 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 2017-04-02The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 10 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
564 J/kg
Mixed-layer CIN
-71 J/kg
Mixed-layer LCL
2447 m above ground
0-6 km bulk shear
54 kt
0-1 km storm-relative helicity
10 m²/s²
0-3 km storm-relative helicity
75 m²/s²
Significant tornado parameter
0.0
Supercell composite
-0.1

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 1, 8:44 PM CDTMesoscale DiscussionSPCBrown, Callahan, Coleman, Comanche, Concho, Eastland and 5 more61 min
Apr 1, 10:06 PM CDTMesoscale DiscussionSPCBandera, Bexar, Blanco, Comal, Edwards, Gillespie and 9 more114 min
Apr 1, 10:28 PM CDTTornado WatchSPCBandera, Edwards, Gillespie, Kerr, Kimble, Kinney and 6 more8 hr
Apr 2, 2:53 AM CDTMesoscale DiscussionSPCBandera, Edwards, Gillespie, Kerr, Kimble, Kinney and 6 more82 min
Apr 2, 5:16 AM CDTMesoscale DiscussionSPCAnderson, Angelina, Bandera, Bastrop, Bell, Bexar and 51 more119 min
Apr 2, 6:00 AM CDTTornado WatchSPCAnderson, Atascosa, Bandera, Bastrop, Bell, Bexar and 51 more7 hr
Apr 2, 9:04 AM CDTMesoscale DiscussionSPCAngelina, Houston, Jasper, Montgomery, Nacogdoches, Newton and 8 more2 hr
Apr 2, 9:44 AM CDTMesoscale DiscussionSPCAustin, Bastrop, Brazos, Burleson, Caldwell, Cherokee and 19 more2 hr
Apr 2, 10:39 AM CDTTornado WatchSPCAngelina, Austin, Cherokee, Colorado, Gregg, Hardin and 20 more5 hr
Apr 2, 12:22 PM CDTMesoscale DiscussionSPCAngelina, Nacogdoches, Sabine, San Augustine, Shelby, Trinity83 min
Apr 2, 1:34 PM CDTTornado Watch PDSSPCAngelina, Hardin, Jasper, Nacogdoches, Newton, Orange and 4 more7 hr
Apr 2, 2:06 PM CDTMesoscale DiscussionSPCSabine54 min
Apr 2, 4:23 PM CDTMesoscale DiscussionSPCAransas, Brazoria, Calhoun, Cameron, Jackson, Kenedy and 5 more3 hr
Apr 2, 5:54 PM CDTMesoscale DiscussionSPCHardin, Jasper, Newton, Orange96 min

Nearby

Mesoscale Discussions in Texas, 2017Every mesoscale discussion in 2017

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.