Alert archive / Texas / Mesoscale Discussions in 2005

Mesoscale Discussion 213

February 23, 20058 parishes in Louisiana; 24 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Feb 23, 2005, 7:50 AM CST for 8 parishes in Louisiana; 24 counties in Texas. It was in force for 115 min.

The area

The outline as issued.

The facts

Issued
Feb 23, 2005, 7:50 AM CST (13:50 UTC)
Expired
Feb 23, 2005, 9:45 AM CST
In force
115 min
Issued by
the Storm Prediction Center
All 32 counties

Beauregard Parish, LA, De Soto Parish, LA, Grant Parish, LA, Natchitoches Parish, LA, Rapides Parish, LA, Red River Parish, LA, Sabine Parish, LA, Vernon Parish, LA, Angelina County, TX, Brazos County, TX, Burleson County, TX, Grimes County, TX, Hardin County, TX, Harris County, TX, Jasper County, TX, Liberty County, TX, Madison County, TX, Montgomery County, TX, Nacogdoches County, TX, Newton County, TX, Panola County, TX, Polk County, TX, Rusk County, TX, Sabine County, TX, San Augustine County, TX, San Jacinto County, TX, Shelby County, TX, Trinity County, TX, Tyler County, TX, Walker County, TX, Waller County, TX, Washington County, TX

The radar

The Shreveport radar (KSHV), 134 km from the middle of the area, began a volume at 13:49 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

Shreveport, LA (KSHV), launched 12:00Z, 1.8 hours before the alert went out and 141 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, Shreveport, LA at 12:00Z on 2005-02-23Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 112 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, Shreveport, LA at 12:00Z on 2005-02-23The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 153 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
112 J/kg
Mixed-layer CIN
-139 J/kg
Mixed-layer LCL
504 m above ground
0-6 km bulk shear
51 kt
0-1 km storm-relative helicity
153 m²/s²
0-3 km storm-relative helicity
171 m²/s²
Significant tornado parameter
0.0
Supercell composite
2.0

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 23, 10:35 AM CSTMesoscale DiscussionSPCAcadia, Allen, Ascension, Avoyelles, Beauregard, Bienville and 37 more115 min
Feb 23, 11:45 AM CSTSevere Thunderstorm WatchSPCAllen, Avoyelles, Caldwell, Catahoula, Concordia, East Baton Rouge and 15 more6 hr
Feb 23, 12:13 PM CSTMesoscale DiscussionSPCEast Carroll, West Carroll2 hr
Feb 23, 3:08 PM CSTMesoscale DiscussionSPCAcadia, Ascension, Cameron, East Baton Rouge, East Feliciana, Iberville and 14 more2 hr
Feb 22, 7:45 PM CSTMesoscale DiscussionSPCArcher, Baylor, Brown, Callahan, Coke, Coleman and 20 more60 min
Feb 22, 9:23 PM CSTMesoscale DiscussionSPCHardeman67 min
Feb 22, 9:45 PM CSTSevere Thunderstorm WatchSPCHardeman5 hr
Feb 22, 10:52 PM CSTMesoscale DiscussionSPCArcher, Bosque, Brown, Clay, Coleman, Collin and 30 more53 min
Feb 22, 11:30 PM CSTSevere Thunderstorm WatchSPCAnderson, Archer, Bosque, Camp, Cherokee, Clay and 48 more8 hr
Feb 23, 1:41 AM CSTMesoscale DiscussionSPCAnderson, Archer, Camp, Cherokee, Clay, Collin and 34 more2 hr
Feb 23, 1:19 PM CSTMesoscale DiscussionSPCBrown, Concho, Crockett, Irion, Kimble, Lampasas and 10 more116 min
Feb 23, 2:00 PM CSTMesoscale DiscussionSPCBrazoria, Calhoun, Chambers, Fort Bend, Harris, Jackson and 5 more2 hr
Feb 23, 2:10 PM CSTSevere Thunderstorm WatchSPCBandera, Blanco, Burnet, Comal, Concho, Coryell and 20 more7 hr

Nearby

Mesoscale Discussions in Texas, 2005Mesoscale Discussions in Louisiana, 2005Every mesoscale discussion in 2005

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.