Alert archive / Louisiana / Mesoscale Discussions in 2007

Mesoscale Discussion 587

April 25, 200712 parishes in Louisiana; Galveston County, Texas

The Storm Prediction Center issued this mesoscale discussion at Apr 25, 2007, 3:05 PM CDT for 12 parishes in Louisiana; Galveston County, Texas. It was in force for 55 min.

The area

The outline as issued.

The facts

Issued
Apr 25, 2007, 3:05 PM CDT (20:05 UTC)
Expired
Apr 25, 2007, 4:00 PM CDT
In force
55 min
Issued by
the Storm Prediction Center

Counties Acadia Parish, LA, Allen Parish, LA, Beauregard Parish, LA, Calcasieu Parish, LA, Cameron Parish, LA, Evangeline Parish, LA, Jefferson Davis Parish, LA, Lafayette Parish, LA, Pointe Coupee Parish, LA, Saint Landry Parish, LA, Vermilion Parish, LA, West Feliciana Parish, LA, Galveston County, TX

The radar

The Lake Charles radar (KLCH), 111 km from the middle of the area, began a volume at 20:05 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 nearest sounding before it

Lake Charles Mun, LA (KLCH), launched 12:00Z, 8.1 hours before the alert went out and 112 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 2007-04-25Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 835 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 2007-04-25The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 63 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
835 J/kg
Mixed-layer CIN
-10 J/kg
Mixed-layer LCL
644 m above ground
0-6 km bulk shear
26 kt
0-1 km storm-relative helicity
63 m²/s²
0-3 km storm-relative helicity
76 m²/s²
Significant tornado parameter
0.2
Supercell composite
1.4

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 25, 2:10 AM CDTMesoscale DiscussionSPCBienville, Bossier, Caddo, Claiborne, De Soto, Jackson and 6 more65 min
Apr 25, 9:00 AM CDTMesoscale DiscussionSPCAcadia, Allen, Avoyelles, Beauregard, Calcasieu, Cameron and 7 more60 min
Apr 25, 9:13 AM CDTTornado WatchSPCAcadia, Allen, Avoyelles, Beauregard, Calcasieu, Cameron and 10 more8 hr
Apr 25, 1:23 PM CDTMesoscale DiscussionSPCCatahoula, Concordia, East Feliciana, Franklin, Madison, Tensas and 1 more67 min
Apr 25, 1:46 PM CDTTornado WatchSPCCatahoula, Concordia, East Baton Rouge, East Carroll, East Feliciana, Franklin and 9 more5 hr
Apr 25, 6:15 PM CDTMesoscale DiscussionSPCBossier, Caddo, Claiborne, De Soto, Webster90 min
Apr 24, 7:33 PM CDTMesoscale DiscussionSPCBowie, Camp, Cass, Collin, Dallas, Delta and 25 more117 min
Apr 24, 10:07 PM CDTMesoscale DiscussionSPCAnderson, Atascosa, Bandera, Bastrop, Bell, Bexar and 65 more83 min
Apr 24, 10:35 PM CDTTornado WatchSPCAnderson, Bell, Bosque, Bowie, Camp, Cass and 37 more5 hr
Apr 24, 10:53 PM CDTTornado WatchSPCAtascosa, Bandera, Bastrop, Bexar, Blanco, Burnet and 28 more7 hr
Apr 24, 11:58 PM CDTMesoscale DiscussionSPCAnderson, Bell, Bowie, Camp, Cass, Cherokee and 20 more92 min
Apr 25, 1:14 AM CDTMesoscale DiscussionSPCAtascosa, Bandera, Bastrop, Bee, Bexar, Blanco and 35 more91 min
Apr 25, 1:40 AM CDTTornado WatchSPCAransas, Austin, Bee, Brazoria, Brazos, Burleson and 30 more7 hr
Apr 25, 4:29 AM CDTMesoscale DiscussionSPCAngelina, Aransas, Austin, Bee, Brazoria, Brazos and 35 more91 min
Apr 25, 7:36 AM CDTMesoscale DiscussionSPCAransas, Austin, Bee, Brazoria, Calhoun, Chambers and 28 more84 min

Nearby

Mesoscale Discussions in Louisiana, 2007Mesoscale Discussions in Texas, 2007Every mesoscale discussion in 2007

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.