Alert archive / Texas / Mesoscale Discussions in 2013

Mesoscale Discussion 135

February 10, 2013Sabine Parish, Louisiana; 24 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Feb 10, 2013, 5:12 AM CST for Sabine Parish, Louisiana; 24 counties in Texas. It was in force for 93 min.

The area

The outline as issued.

The facts

Issued
Feb 10, 2013, 5:12 AM CST (11:12 UTC)
Expired
Feb 10, 2013, 6:45 AM CST
In force
93 min
Issued by
the Storm Prediction Center
All 25 counties

Sabine Parish, LA, Anderson County, TX, Angelina County, TX, Brazos County, TX, Burleson County, TX, Cherokee County, TX, Falls County, TX, Freestone County, TX, Grimes County, TX, Houston County, TX, Lee County, TX, Leon County, TX, Limestone County, TX, Madison County, TX, Milam County, TX, Nacogdoches County, TX, Polk County, TX, Robertson County, TX, Sabine County, TX, San Augustine County, TX, Shelby County, TX, Trinity County, TX, Tyler County, TX, Walker County, TX, Williamson County, TX

The radar

The Houston radar (KHGX), 182 km from the middle of the area, began a volume at 11:13 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

Fort Worth, TX (KFWD), launched 00:00Z, 11.2 hours before the alert went out and 262 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, Fort Worth, TX at 00:00Z on 2013-02-10Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1 joules per kilogram.LCLEL10008507005003002001001 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, Fort Worth, TX at 00:00Z on 2013-02-10The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 728 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
1 J/kg
Mixed-layer CIN
0 J/kg
Mixed-layer LCL
459 m above ground
0-6 km bulk shear
61 kt
0-1 km storm-relative helicity
728 m²/s²
0-3 km storm-relative helicity
777 m²/s²
Significant tornado parameter
0.0
Supercell composite
-0.2

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
Feb 10, 4:18 AM CSTSevere Thunderstorm WatchSPCBienville, Bossier, Caddo, Claiborne, De Soto, Natchitoches and 3 more5 hr
Feb 10, 6:20 AM CSTMesoscale DiscussionSPCAllen, Avoyelles, Beauregard, Bienville, Caldwell, Catahoula and 18 more85 min
Feb 10, 6:58 AM CSTTornado WatchSPCAllen, Avoyelles, Beauregard, Bienville, Caldwell, Catahoula and 24 more7 hr
Feb 10, 10:19 AM CSTMesoscale DiscussionSPCAcadia, Allen, Avoyelles, Beauregard, Caldwell, Catahoula and 19 more86 min
Feb 10, 10:53 AM CSTMesoscale DiscussionSPCAvoyelles, Concordia, Evangeline, Pointe Coupee, Saint Landry, West Feliciana97 min
Feb 10, 11:10 AM CSTTornado WatchSPCAvoyelles, Catahoula, Concordia, East Baton Rouge, East Feliciana, Evangeline and 12 more7 hr
Feb 10, 1:59 PM CSTMesoscale DiscussionSPCEast Baton Rouge, East Feliciana, Livingston, Pointe Coupee, Saint Helena, Saint Landry and 5 more91 min
Feb 10, 3:47 PM CSTMesoscale DiscussionSPCSaint Helena, Washington88 min
Feb 10, 5:03 PM CSTMesoscale DiscussionSPCEast Baton Rouge, East Feliciana, Evangeline, Livingston, Pointe Coupee, Saint Helena and 6 more27 min
Feb 10, 5:34 PM CSTTornado WatchSPCEast Baton Rouge, East Feliciana, Livingston, Pointe Coupee, Saint Helena, Saint Tammany and 4 more5 hr
Feb 9, 11:12 PM CSTMesoscale DiscussionSPCBosque, Brown, Callahan, Coleman, Comanche, Concho and 21 more2 hr
Feb 9, 11:37 PM CSTSevere Thunderstorm WatchSPCBell, Bosque, Brown, Callahan, Coleman, Collin and 52 more6 hr
Feb 10, 12:41 AM CSTMesoscale DiscussionSPCBandera, Bastrop, Bexar, Blanco, Burnet, Caldwell and 11 more94 min
Feb 10, 1:33 AM CSTTornado WatchSPCAnderson, Bandera, Bastrop, Bell, Blanco, Brazos and 22 more6 hr
Feb 10, 2:39 AM CSTMesoscale DiscussionSPCBosque, Camp, Cherokee, Collin, Coryell, Dallas and 33 more2 hr

Nearby

Mesoscale Discussions in Texas, 2013Mesoscale Discussions in Louisiana, 2013Every mesoscale discussion in 2013

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.