Alert archive / Texas / Mesoscale Discussions in 2007

Mesoscale Discussion 394

March 31, 20076 parishes in Louisiana; 20 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Mar 31, 2007, 7:08 AM CDT for 6 parishes in Louisiana; 20 counties in Texas. It was in force for 67 min.

The area

The outline as issued.

The facts

Issued
Mar 31, 2007, 7:08 AM CDT (12:08 UTC)
Expired
Mar 31, 2007, 8:15 AM CDT
In force
67 min
Issued by
the Storm Prediction Center
All 26 counties

Acadia Parish, LA, Calcasieu Parish, LA, Cameron Parish, LA, Jefferson Davis Parish, LA, Lafayette Parish, LA, Vermilion Parish, LA, Aransas County, TX, Bee County, TX, Brazoria County, TX, Calhoun County, TX, Chambers County, TX, Fort Bend County, TX, Galveston County, TX, Goliad County, TX, Hardin County, TX, Harris County, TX, Jackson County, TX, Jefferson County, TX, Liberty County, TX, Live Oak County, TX, Matagorda County, TX, Montgomery County, TX, Orange County, TX, Refugio County, TX, Victoria County, TX, Wharton County, TX

The radar

The Houston radar (KHGX), 61 km from the middle of the area, began a volume at 12:09 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

Lake Charles Mun, LA (KLCH), launched 12:00Z, 0.1 hours before the alert went out and 134 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 2007-03-31Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 772 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 2007-03-31The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 166 square meters per square second.1939587897Sfc1 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
772 J/kg
Mixed-layer CIN
-11 J/kg
Mixed-layer LCL
660 m above ground
0-6 km bulk shear
37 kt
0-1 km storm-relative helicity
166 m²/s²
0-3 km storm-relative helicity
203 m²/s²
Significant tornado parameter
0.6
Supercell composite
4.5

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
Mar 30, 10:06 PM CDTMesoscale DiscussionSPCBienville, Bossier, Caddo, Claiborne, De Soto, Natchitoches and 3 more84 min
Mar 30, 10:28 PM CDTSevere Thunderstorm WatchSPCBossier, Caddo8 hr
Mar 31, 2:40 AM CDTMesoscale DiscussionSPCBossier, Caddo95 min
Mar 31, 8:40 AM CDTSevere Thunderstorm WatchSPCAcadia, Allen, Avoyelles, Beauregard, Calcasieu, Cameron and 15 more5 hr
Mar 31, 11:03 AM CDTMesoscale DiscussionSPCMorehouse, Union, West Carroll57 min
Mar 31, 12:08 PM CDTMesoscale DiscussionSPCAscension, Assumption, Avoyelles, Catahoula, Concordia, East Baton Rouge and 25 more97 min
Mar 30, 7:38 PM CDTMesoscale DiscussionSPCAnderson, Atascosa, Bandera, Bastrop, Bell, Bexar and 74 more2 hr
Mar 30, 9:48 PM CDTMesoscale DiscussionSPCAtascosa, Bandera, Bastrop, Bell, Bexar, Blanco and 49 more117 min
Mar 30, 11:53 PM CDTMesoscale DiscussionSPCAnderson, Atascosa, Bandera, Bastrop, Bell, Bexar and 45 more67 min
Mar 31, 2:12 AM CDTMesoscale DiscussionSPCAransas, Atascosa, Austin, Bastrop, Bee, Brazoria and 32 more93 min
Mar 31, 3:17 AM CDTTornado WatchSPCAransas, Austin, Bee, Brazoria, Calhoun, Chambers and 17 more7 hr
Mar 31, 5:30 AM CDTMesoscale DiscussionSPCAransas, Austin, Bee, Brazoria, Calhoun, Chambers and 16 more2 hr

Nearby

Mesoscale Discussions in Texas, 2007Mesoscale Discussions in Louisiana, 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.