Alert archive / Louisiana / Mesoscale Discussions in 2014

Mesoscale Discussion 1814

October 6, 201433 parishes in Louisiana; 6 counties in Mississippi; 14 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Oct 6, 2014, 9:31 AM CDT for 33 parishes in Louisiana; 6 counties in Mississippi; 14 counties in Texas. It was in force for 119 min.

The area

The outline as issued.

The facts

Issued: Oct 6, 2014, 9:31 AM CDT (14:31 UTC)
Expired: Oct 6, 2014, 11:30 AM CDT
In force: 119 min
Issued by: the Storm Prediction Center
Chance of a watch: 40%

All 53 counties

Acadia Parish, LA, Allen Parish, LA, Ascension Parish, LA, Assumption Parish, LA, Avoyelles Parish, LA, Beauregard Parish, LA, Calcasieu Parish, LA, Cameron Parish, LA, Catahoula Parish, LA, Concordia Parish, LA, East Baton Rouge Parish, LA, East Feliciana Parish, LA, Evangeline Parish, LA, Grant Parish, LA, Iberia Parish, LA, Iberville Parish, LA, Jefferson Davis Parish, LA, Lafayette Parish, LA, LaSalle Parish, LA, Livingston Parish, LA, Pointe Coupee Parish, LA, Rapides Parish, LA, Saint Helena Parish, LA, Saint James Parish, LA, Saint John the Baptist Parish, LA, Saint Landry Parish, LA, Saint Martin Parish, LA, St. Mary Parish, LA, Vermilion Parish, LA, Vernon Parish, LA, West Baton Rouge Parish, LA, West Feliciana Parish, LA, Winn Parish, LA, Adams County, MS, Amite County, MS, Franklin County, MS, Jefferson County, MS, Pike County, MS, Wilkinson County, MS, Chambers County, TX, Hardin County, TX, Harris County, TX, Jasper County, TX, Jefferson County, TX, Liberty County, TX, Montgomery County, TX, Newton County, TX, Orange County, TX, Polk County, TX, San Jacinto County, TX, Trinity County, TX, Tyler County, TX, Walker County, TX

The radar

The Ft Polk radar (KPOE), 52 km from the middle of the area, began a volume at 14:33 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, 2.5 hours before the alert went out and 65 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: 1159 J/kg
Mixed-layer CIN: -34 J/kg
Mixed-layer LCL: 912 m above ground
0-6 km bulk shear: 30 kt
0-1 km storm-relative helicity: 69 m²/s²
0-3 km storm-relative helicity: 152 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.9

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
Oct 6, 5:04 AM CDT	Mesoscale Discussion	SPC	Caddo	86 min
Oct 6, 3:28 PM CDT	Mesoscale Discussion	SPC	Chickasaw, Clay, Itawamba, Lee, Lowndes, Monroe and 3 more	62 min
Oct 6, 5:20 PM CDT	Mesoscale Discussion	SPC	DeSoto, Tate, Tunica	115 min
Oct 6, 6:36 PM CDT	Mesoscale Discussion	SPC	Alcorn, Itawamba, Lee, Prentiss, Tishomingo	84 min

Nearby

Mesoscale Discussions in Louisiana, 2014 Mesoscale Discussions in Texas, 2014 Mesoscale Discussions in Mississippi, 2014 Every mesoscale discussion in 2014

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.