Alert archive / Texas / Mesoscale Discussions in 2015

Mesoscale Discussion 329

April 16, 2015Lea County, New Mexico; 4 counties in Oklahoma; 38 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Apr 16, 2015, 9:20 PM MDT for Lea County, New Mexico; 4 counties in Oklahoma; 38 counties in Texas. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
Apr 16, 2015, 9:20 PM MDT (03:20 UTC)
Expired
Apr 16, 2015, 11:45 PM MDT
In force
2 hr
Issued by
the Storm Prediction Center
Chance of a watch
40%
All 43 counties

Lea County, NM, Beckham County, OK, Ellis County, OK, Harmon County, OK, Roger Mills County, OK, Andrews County, TX, Armstrong County, TX, Borden County, TX, Briscoe County, TX, Carson County, TX, Castro County, TX, Childress County, TX, Cochran County, TX, Collingsworth County, TX, Cottle County, TX, Crosby County, TX, Dawson County, TX, Dickens County, TX, Donley County, TX, Floyd County, TX, Gaines County, TX, Garza County, TX, Gray County, TX, Hale County, TX, Hall County, TX, Hansford County, TX, Hemphill County, TX, Hockley County, TX, Hutchinson County, TX, Lamb County, TX, Lipscomb County, TX, Lubbock County, TX, Lynn County, TX, Martin County, TX, Motley County, TX, Ochiltree County, TX, Potter County, TX, Randall County, TX, Roberts County, TX, Swisher County, TX, Terry County, TX, Wheeler County, TX, Yoakum County, TX

The radar

The Lubbock radar (KLBB), 20 km from the middle of the area, began a volume at 03:24 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

Amarillo Airport, TX (KAMA), launched 00:00Z, 3.3 hours before the alert went out and 158 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, Amarillo Airport, TX at 00:00Z on 2015-04-17Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 301 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, Amarillo Airport, TX at 00:00Z on 2015-04-17The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 17 square meters per square second.19395878Sfc1 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
301 J/kg
Mixed-layer CIN
-116 J/kg
Mixed-layer LCL
1659 m above ground
0-6 km bulk shear
55 kt
0-1 km storm-relative helicity
17 m²/s²
0-3 km storm-relative helicity
142 m²/s²
Significant tornado parameter
-0.0
Supercell composite
-0.1

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, 6:08 PM MDTMesoscale DiscussionSPCBeckham, Ellis, Roger Mills2 hr
Apr 16, 6:16 PM MDTMesoscale DiscussionSPCAlfalfa, Blaine, Caddo, Comanche, Cotton, Custer and 10 more89 min
Apr 16, 6:44 PM MDTMesoscale DiscussionSPCCimarron, Texas61 min
Apr 16, 7:56 PM MDTMesoscale DiscussionSPCRoger Mills94 min
Apr 16, 8:17 PM MDTMesoscale DiscussionSPCAlfalfa, Blaine, Caddo, Custer, Dewey, Garfield and 5 more88 min
Apr 16, 10:59 PM MDTSevere Thunderstorm WatchSPCBeckham, Blaine, Custer, Dewey, Ellis, Greer and 4 more5 hr
Apr 17, 1:02 AM MDTMesoscale DiscussionSPCBeckham, Blaine, Custer, Dewey, Ellis, Greer and 6 more88 min
Apr 17, 3:43 AM MDTMesoscale DiscussionSPCBeckham, Blaine, Caddo, Canadian, Comanche, Custer and 8 more62 min
Apr 17, 2:06 PM MDTMesoscale DiscussionSPCAlfalfa, Beaver, Beckham, Blaine, Custer, Dewey and 12 more84 min
Apr 16, 7:20 PM MDTMesoscale DiscussionSPCBrazoria, Chambers, Colorado, Fort Bend, Galveston, Harris and 2 more85 min
Apr 16, 7:36 PM MDTTornado WatchSPCAustin, Brazoria, Chambers, Colorado, Fort Bend, Galveston and 10 more3 hr
Apr 16, 10:33 PM MDTMesoscale DiscussionSPCAustin, Brazoria, Chambers, Colorado, Fort Bend, Galveston and 6 more87 min
Apr 17, 12:10 AM MDTMesoscale DiscussionSPCBorden, Childress, Cottle, Crosby, Dawson, Dickens and 13 more95 min
Apr 17, 9:26 AM MDTMesoscale DiscussionSPCBandera, Bexar, Blanco, Burnet, Comal, Edwards and 12 more2 hr
Apr 17, 9:55 AM MDTMesoscale DiscussionSPCBaylor, Brown, Callahan, Coke, Coleman, Concho and 15 more2 hr
Apr 17, 10:53 AM MDTSevere Thunderstorm WatchSPCArcher, Atascosa, Bandera, Baylor, Bee, Bell and 73 more7 hr
Apr 17, 12:31 PM MDTMesoscale DiscussionSPCAtascosa, Bee, Calhoun, DeWitt, Dimmit, Frio and 12 more89 min
Apr 17, 2:22 PM MDTMesoscale DiscussionSPCAransas, Bee, Brazoria, Calhoun, Colorado, DeWitt and 11 more113 min
Apr 17, 2:30 PM MDTSevere Thunderstorm WatchSPCAransas, Atascosa, Austin, Bastrop, Brazoria, Brazos and 30 more6 hr
Apr 17, 4:02 PM MDTMesoscale DiscussionSPCArcher, Baylor, Bosque, Brown, Callahan, Clay and 28 more88 min
Apr 17, 4:41 PM MDTMesoscale DiscussionSPCAransas, Atascosa, Bee, Brazoria, Brooks, Calhoun and 26 more94 min
Apr 17, 5:57 PM MDTTornado WatchSPCAransas, Bee, Brooks, Calhoun, Duval, Goliad and 16 more5 hr

Nearby

Mesoscale Discussions in Texas, 2015Mesoscale Discussions in Oklahoma, 2015Mesoscale Discussions in New Mexico, 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.