Alert archive / Louisiana / Mesoscale Discussions in 2006

Mesoscale Discussion 659

April 25, 2006Columbia County, Union County, Arkansas; 17 parishes in Louisiana; 6 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Apr 25, 2006, 8:45 PM CDT for Columbia County, Union County, Arkansas; 17 parishes in Louisiana; 6 counties in Texas. It was in force for 90 min.

The area

The outline as issued.

The facts

Issued
Apr 25, 2006, 8:45 PM CDT (01:45 UTC)
Expired
Apr 25, 2006, 10:15 PM CDT
In force
90 min
Issued by
the Storm Prediction Center
All 25 counties

Columbia County, AR, Union County, AR, Beauregard Parish, LA, Bienville Parish, LA, Bossier Parish, LA, Claiborne Parish, LA, De Soto Parish, LA, Grant Parish, LA, Jackson Parish, LA, LaSalle Parish, LA, Lincoln Parish, LA, Natchitoches Parish, LA, Ouachita Parish, LA, Red River Parish, LA, Sabine Parish, LA, Union Parish, LA, Vernon Parish, LA, Webster Parish, LA, Winn Parish, LA, Jasper County, TX, Newton County, TX, Sabine County, TX, San Augustine County, TX, Shelby County, TX, Tyler County, TX

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, 1.8 hours before the alert went out and 169 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 2006-04-26Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2353 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 2006-04-26The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 3 square meters per square second.193958Sfc1 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
2353 J/kg
Mixed-layer CIN
-5 J/kg
Mixed-layer LCL
758 m above ground
0-6 km bulk shear
25 kt
0-1 km storm-relative helicity
3 m²/s²
0-3 km storm-relative helicity
38 m²/s²
Significant tornado parameter
0.1
Supercell composite
0.7

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 25, 7:20 PM CDTMesoscale DiscussionSPCBaxter, Clay, Cleburne, Craighead, Crittenden, Cross and 15 more55 min
Apr 25, 10:01 PM CDTMesoscale DiscussionSPCCrittenden59 min
Apr 26, 1:23 AM CDTMesoscale DiscussionSPCChicot2 hr
Apr 25, 9:42 PM CDTSevere Thunderstorm WatchSPCAcadia, Allen, Beauregard, Bienville, Calcasieu, Caldwell and 19 more6 hr
Apr 25, 11:42 PM CDTMesoscale DiscussionSPCAcadia, Allen, Beauregard, Bienville, Bossier, Caddo and 21 more63 min
Apr 26, 3:19 AM CDTMesoscale DiscussionSPCAcadia, Allen, Ascension, Assumption, Avoyelles, Beauregard and 18 more86 min
Apr 25, 7:16 PM CDTSevere Thunderstorm WatchSPCBrooks, Cameron, Hidalgo, Jim Hogg, Kenedy, Starr and 2 more5 hr
Apr 25, 7:31 PM CDTMesoscale DiscussionSPCAransas, Atascosa, Austin, Bee, Brazoria, Calhoun and 36 more89 min
Apr 25, 9:38 PM CDTMesoscale DiscussionSPCBrooks, Cameron, Hidalgo, Jim Hogg, Kenedy, Starr and 2 more97 min
Apr 25, 11:57 PM CDTMesoscale DiscussionSPCBandera, Bastrop, Bexar, Blanco, Brazos, Burleson and 16 more93 min
Apr 26, 1:01 AM CDTSevere Thunderstorm WatchSPCAustin, Bastrop, Brazoria, Caldwell, Chambers, Colorado and 19 more6 hr
Apr 26, 6:05 AM CDTMesoscale DiscussionSPCGrimes, Liberty, Montgomery, Polk, San Jacinto, Trinity and 1 more55 min

Nearby

Mesoscale Discussions in Louisiana, 2006Mesoscale Discussions in Texas, 2006Mesoscale Discussions in Arkansas, 2006Every mesoscale discussion in 2006

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.