Alert archive / Texas / Mesoscale Discussions in 2014

Mesoscale Discussion 280

April 4, 201432 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Apr 4, 2014, 2:40 AM CDT for 32 counties in Texas. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
Apr 4, 2014, 2:40 AM CDT (07:40 UTC)
Expired
Apr 4, 2014, 4:45 AM CDT
In force
2 hr
Issued by
the Storm Prediction Center
Chance of a watch
60%
All 32 counties

Angelina County, TX, Austin County, TX, Brazoria County, TX, Brazos County, TX, Burleson County, TX, Chambers County, TX, Colorado County, TX, Fayette County, TX, Fort Bend County, TX, Gonzales County, TX, Grimes County, TX, Hardin County, TX, Harris County, TX, Houston County, TX, Jackson County, TX, Jasper County, TX, Jefferson County, TX, Lavaca County, TX, Liberty County, TX, Madison County, TX, Montgomery County, TX, Orange County, TX, Polk County, TX, Sabine County, TX, San Augustine County, TX, San Jacinto County, TX, Trinity County, TX, Tyler County, TX, Walker County, TX, Waller County, TX, Washington County, TX, Wharton County, TX

The radar

The Houston radar (KHGX), 94 km from the middle of the area, began a volume at 07:43 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

Lake Charles Mun, LA (KLCH), launched 00:00Z, 7.7 hours before the alert went out and 250 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, Lake Charles Mun, LA at 00:00Z on 2014-04-04Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2356 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, Lake Charles Mun, LA at 00:00Z on 2014-04-04The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 243 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
2356 J/kg
Mixed-layer CIN
-68 J/kg
Mixed-layer LCL
575 m above ground
0-6 km bulk shear
37 kt
0-1 km storm-relative helicity
243 m²/s²
0-3 km storm-relative helicity
214 m²/s²
Significant tornado parameter
1.9
Supercell composite
12.3

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 3, 7:03 PM CDTMesoscale DiscussionSPCAnderson, Bell, Bosque, Bowie, Camp, Cass and 49 more57 min
Apr 3, 7:18 PM CDTMesoscale DiscussionSPCBandera, Bastrop, Bexar, Blanco, Burnet, Caldwell and 11 more57 min
Apr 3, 7:35 PM CDTSevere Thunderstorm WatchSPCBandera, Bastrop, Blanco, Burnet, Caldwell, Comal and 9 more2 hr
Apr 3, 8:44 PM CDTMesoscale DiscussionSPCAnderson, Bowie, Camp, Cass, Cherokee, Collin and 32 more31 min
Apr 3, 8:54 PM CDTTornado WatchSPCBowie, Camp, Cass, Cherokee, Delta, Fannin and 22 more7 hr
Apr 3, 11:52 PM CDTSevere Thunderstorm WatchSPCAtascosa, Bee, Dimmit, Duval, Frio, Goliad and 12 more8 hr
Apr 4, 12:55 AM CDTMesoscale DiscussionSPCGregg, Harrison, Henderson, Marion, Panola, Rusk and 4 more95 min
Apr 4, 2:58 AM CDTMesoscale DiscussionSPCAtascosa, Bee, Dimmit, Frio, Karnes, La Salle and 3 more92 min
Apr 4, 3:34 AM CDTSevere Thunderstorm WatchSPCAngelina, Austin, Brazoria, Brazos, Burleson, Chambers and 24 more6 hr
Apr 4, 5:49 AM CDTMesoscale DiscussionSPCAngelina, Austin, Chambers, Hardin, Harris, Jasper and 17 more56 min
Apr 4, 6:12 AM CDTMesoscale DiscussionSPCBee, Brooks, Cameron, Duval, Hidalgo, Jim Hogg and 12 more3 hr

Nearby

Mesoscale Discussions in Texas, 2014Every mesoscale discussion in 2014

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.