Alert archive / Texas / Mesoscale Discussions in 2015

Mesoscale Discussion 326

April 16, 20158 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Apr 16, 2015, 8:20 PM CDT for 8 counties in Texas. It was in force for 85 min.

The area

The outline as issued.

The facts

Issued
Apr 16, 2015, 8:20 PM CDT (01:20 UTC)
Expired
Apr 16, 2015, 9:45 PM CDT
In force
85 min
Issued by
the Storm Prediction Center

Counties Brazoria County, TX, Chambers County, TX, Colorado County, TX, Fort Bend County, TX, Galveston County, TX, Harris County, TX, Jefferson County, TX, Wharton County, TX

The radar

The Houston radar (KHGX), 31 km from the middle of the area, began a volume at 01:23 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

Corpus Christi, TX (KCRP), launched 00:00Z, 1.3 hours before the alert went out and 278 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, Corpus Christi, TX at 00:00Z on 2015-04-17Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2661 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, Corpus Christi, TX at 00:00Z on 2015-04-17The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 126 square meters per square second.1939587897117Sfc1 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
2661 J/kg
Mixed-layer CIN
-14 J/kg
Mixed-layer LCL
705 m above ground
0-6 km bulk shear
53 kt
0-1 km storm-relative helicity
126 m²/s²
0-3 km storm-relative helicity
152 m²/s²
Significant tornado parameter
2.6
Supercell composite
13.3

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

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SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Apr 16, 7:08 PM CDTMesoscale DiscussionSPCCollingsworth, Wheeler2 hr
Apr 16, 7:16 PM CDTMesoscale DiscussionSPCArcher, Baylor, Briscoe, Brown, Callahan, Childress and 41 more89 min
Apr 16, 7:44 PM CDTMesoscale DiscussionSPCDallam, Hansford, Sherman61 min
Apr 16, 8:36 PM CDTTornado WatchSPCAustin, Brazoria, Chambers, Colorado, Fort Bend, Galveston and 10 more3 hr
Apr 16, 10:20 PM CDTMesoscale DiscussionSPCAndrews, Armstrong, Borden, Briscoe, Carson, Castro and 32 more2 hr
Apr 16, 11:33 PM CDTMesoscale DiscussionSPCAustin, Brazoria, Chambers, Colorado, Fort Bend, Galveston and 6 more87 min
Apr 16, 11:59 PM CDTSevere Thunderstorm WatchSPCCollingsworth, Donley, Gray, Hemphill, Roberts, Wheeler5 hr
Apr 17, 1:10 AM CDTMesoscale DiscussionSPCBorden, Childress, Cottle, Crosby, Dawson, Dickens and 13 more95 min
Apr 17, 2:02 AM CDTMesoscale DiscussionSPCCollingsworth, Donley, Gray, Hemphill, Lipscomb, Roberts and 1 more88 min
Apr 17, 4:43 AM CDTMesoscale DiscussionSPCHardeman62 min
Apr 17, 10:26 AM CDTMesoscale DiscussionSPCBandera, Bexar, Blanco, Burnet, Comal, Edwards and 12 more2 hr
Apr 17, 10:55 AM CDTMesoscale DiscussionSPCBaylor, Brown, Callahan, Coke, Coleman, Concho and 15 more2 hr
Apr 17, 11:53 AM CDTSevere Thunderstorm WatchSPCArcher, Atascosa, Bandera, Baylor, Bee, Bell and 73 more7 hr
Apr 17, 1:31 PM CDTMesoscale DiscussionSPCAtascosa, Bee, Calhoun, DeWitt, Dimmit, Frio and 12 more89 min
Apr 17, 3:06 PM CDTMesoscale DiscussionSPCBriscoe, Carson, Childress, Collingsworth, Donley, Gray and 8 more84 min
Apr 17, 3:22 PM CDTMesoscale DiscussionSPCAransas, Bee, Brazoria, Calhoun, Colorado, DeWitt and 11 more113 min
Apr 17, 3:30 PM CDTSevere Thunderstorm WatchSPCAransas, Atascosa, Austin, Bastrop, Brazoria, Brazos and 30 more6 hr
Apr 17, 5:02 PM CDTMesoscale DiscussionSPCArcher, Baylor, Bosque, Brown, Callahan, Clay and 28 more88 min
Apr 17, 5:41 PM CDTMesoscale DiscussionSPCAransas, Atascosa, Bee, Brazoria, Brooks, Calhoun and 26 more94 min
Apr 17, 6:57 PM CDTTornado WatchSPCAransas, Bee, Brooks, Calhoun, Duval, Goliad and 16 more5 hr

Nearby

Mesoscale Discussions in Texas, 2015Every mesoscale discussion in 2015

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.