Alert archive / Texas / Mesoscale Discussions in 2015

Mesoscale Discussion 385

April 19, 2015Cameron Parish, Louisiana; 11 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Apr 19, 2015, 6:56 PM CDT for Cameron Parish, Louisiana; 11 counties in Texas. It was in force for 64 min.

The area

The outline as issued.

The facts

Issued: Apr 19, 2015, 6:56 PM CDT (23:56 UTC)
Expired: Apr 19, 2015, 8:00 PM CDT
In force: 64 min
Issued by: the Storm Prediction Center

Counties Cameron Parish, LA, Austin County, TX, Chambers County, TX, Colorado County, TX, Fort Bend County, TX, Galveston County, TX, Harris County, TX, Jefferson County, TX, Liberty County, TX, Orange County, TX, Waller County, TX, Wharton County, TX

The radar

The Houston radar (KHGX), 33 km from the middle of the area, began a volume at 23:57 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, 11.9 hours before the alert went out and 192 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1670 m above ground
0-6 km bulk shear: 53 kt
0-1 km storm-relative helicity: 120 m²/s²
0-3 km storm-relative helicity: 122 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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.

Issued	Product	Office	Counties	Lasted
Apr 19, 2:06 AM CDT	Mesoscale Discussion	SPC	Ascension, Assumption, East Baton Rouge, East Feliciana, Livingston, Orleans and 7 more	84 min
Apr 19, 2:56 AM CDT	Mesoscale Discussion	SPC	Allen, Avoyelles, Bienville, Caldwell, Catahoula, Concordia and 11 more	94 min
Apr 19, 1:52 PM CDT	Mesoscale Discussion	SPC	Allen, Beauregard, Bienville, Bossier, Caddo, Calcasieu and 16 more	53 min
Apr 19, 2:31 PM CDT	Severe Thunderstorm Watch	SPC	Allen, Beauregard, Bienville, Bossier, Caddo, Calcasieu and 16 more	7 hr
Apr 19, 4:45 PM CDT	Mesoscale Discussion	SPC	Allen, Beauregard, Bienville, Bossier, Caddo, Calcasieu and 22 more	2 hr
Apr 19, 5:46 PM CDT	Tornado Watch	SPC	Bienville, Bossier, Caddo, Caldwell, Catahoula, Claiborne and 20 more	6 hr
Apr 18, 7:46 PM CDT	Mesoscale Discussion	SPC	Childress, Cottle, Foard, Hardeman, Wichita, Wilbarger	89 min
Apr 18, 8:24 PM CDT	Mesoscale Discussion	SPC	Anderson, Bastrop, Bell, Blanco, Brazos, Burleson and 25 more	96 min
Apr 19, 12:43 PM CDT	Mesoscale Discussion	SPC	Bowie, Fannin, Lamar, Red River	2 hr

Nearby

Mesoscale Discussions in Texas, 2015 Mesoscale Discussions in Louisiana, 2015 Every mesoscale discussion in 2015

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.