Alert archive / Texas / Mesoscale Discussions in 2005

Mesoscale Discussion 651

April 22, 200516 parishes in Louisiana; 14 counties in Mississippi; 22 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Apr 22, 2005, 11:06 AM CDT for 16 parishes in Louisiana; 14 counties in Mississippi; 22 counties in Texas. It was in force for 114 min.

The area

The outline as issued.

The facts

Issued
Apr 22, 2005, 11:06 AM CDT (16:06 UTC)
Expired
Apr 22, 2005, 1:00 PM CDT
In force
114 min
Issued by
the Storm Prediction Center
All 52 counties

Avoyelles Parish, LA, Caldwell Parish, LA, Catahoula Parish, LA, Concordia Parish, LA, De Soto Parish, LA, Franklin Parish, LA, Grant Parish, LA, LaSalle Parish, LA, Madison Parish, LA, Natchitoches Parish, LA, Rapides Parish, LA, Red River Parish, LA, Sabine Parish, LA, Tensas Parish, LA, Vernon Parish, LA, Winn Parish, LA, Adams County, MS, Amite County, MS, Claiborne County, MS, Copiah County, MS, Franklin County, MS, Hinds County, MS, Jefferson County, MS, Jefferson Davis County, MS, Lawrence County, MS, Lincoln County, MS, Pike County, MS, Simpson County, MS, Warren County, MS, Wilkinson County, MS, Angelina County, TX, Brazos County, TX, Burleson County, TX, Grimes County, TX, Houston County, TX, Jasper County, TX, Leon County, TX, Madison County, TX, Milam County, TX, Montgomery County, TX, Nacogdoches County, TX, Newton County, TX, Polk County, TX, Robertson 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, Washington 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 12:00Z, 4.1 hours before the alert went out and 153 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 12:00Z on 2005-04-22Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 425 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 12:00Z on 2005-04-22The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 65 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
425 J/kg
Mixed-layer CIN
-205 J/kg
Mixed-layer LCL
751 m above ground
0-6 km bulk shear
25 kt
0-1 km storm-relative helicity
65 m²/s²
0-3 km storm-relative helicity
79 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.4

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 22, 11:30 AM CDTSevere Thunderstorm WatchSPCAllen, Avoyelles, Beauregard, Caldwell, Catahoula, Concordia and 12 more8 hr
Apr 22, 2:25 PM CDTMesoscale DiscussionSPCAllen, Avoyelles, Beauregard, Caldwell, Catahoula, Concordia and 12 more95 min
Apr 22, 6:40 PM CDTSevere Thunderstorm WatchSPCAscension, Avoyelles, East Baton Rouge, East Feliciana, Iberville, Livingston and 10 more7 hr
Apr 22, 5:36 AM CDTMesoscale DiscussionSPCAlcorn, Itawamba, Lee, Prentiss, Tippah, Tishomingo and 1 more84 min
Apr 22, 9:15 AM CDTMesoscale DiscussionSPCAttala, Choctaw, Clay, Holmes, Kemper, Leake and 10 more90 min
Apr 22, 9:50 AM CDTSevere Thunderstorm WatchSPCAttala, Choctaw, Clarke, Clay, Jasper, Kemper and 11 more5 hr
Apr 22, 12:41 PM CDTMesoscale DiscussionSPCClarke, Jasper, Lauderdale, Newton64 min
Apr 22, 2:35 PM CDTSevere Thunderstorm WatchSPCAttala, Choctaw, Clarke, Greene, Jasper, Jones and 11 more6 hr
Apr 22, 2:49 PM CDTMesoscale DiscussionSPCAlcorn, Itawamba, Lee, Pontotoc, Prentiss, Tishomingo86 min
Apr 21, 7:59 PM CDTMesoscale DiscussionSPCBrown, Callahan, Coleman, Comanche, Concho, Denton and 17 more91 min
Apr 21, 10:36 PM CDTMesoscale DiscussionSPCConcho, Crockett, McCulloch, Menard, Schleicher, Sutton and 1 more84 min
Apr 22, 5:22 PM CDTMesoscale DiscussionSPCAtascosa, Austin, Bandera, Bastrop, Bexar, Brazoria and 32 more113 min

Nearby

Mesoscale Discussions in Texas, 2005Mesoscale Discussions in Louisiana, 2005Mesoscale Discussions in Mississippi, 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.