Alert archive / Louisiana / Mesoscale Discussions in 2003

Mesoscale Discussion 1377

June 13, 200327 parishes in Louisiana; 15 counties in Mississippi

The Storm Prediction Center issued this mesoscale discussion at Jun 13, 2003, 6:13 PM CDT for 27 parishes in Louisiana; 15 counties in Mississippi. It was in force for 92 min.

The area

The outline as issued.

The facts

Issued: Jun 13, 2003, 6:13 PM CDT (23:13 UTC)
Expired: Jun 13, 2003, 7:45 PM CDT
In force: 92 min
Issued by: the Storm Prediction Center

All 42 counties

Acadia Parish, LA, Allen Parish, LA, Ascension Parish, LA, Avoyelles Parish, LA, Beauregard Parish, LA, Calcasieu Parish, LA, Cameron Parish, LA, Concordia Parish, LA, East Baton Rouge Parish, LA, East Feliciana Parish, LA, Evangeline Parish, LA, Iberville Parish, LA, Jefferson Davis Parish, LA, Lafayette Parish, LA, Livingston Parish, LA, Pointe Coupee Parish, LA, Rapides Parish, LA, Saint Helena Parish, LA, Saint Landry Parish, LA, Saint Martin Parish, LA, Saint Tammany Parish, LA, Tangipahoa Parish, LA, Vermilion Parish, LA, Vernon Parish, LA, Washington Parish, LA, West Baton Rouge Parish, LA, West Feliciana Parish, LA, Adams County, MS, Amite County, MS, Covington County, MS, Forrest County, MS, Franklin County, MS, Jefferson Davis County, MS, Jones County, MS, Lamar County, MS, Lawrence County, MS, Lincoln County, MS, Marion County, MS, Pearl River County, MS, Pike County, MS, Walthall County, MS, Wilkinson County, MS

The watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

Severe Thunderstorm Watch 540Jun 13, 7:35 PM CDT

The nearest sounding before it

Lake Charles Mun, LA (KLCH), launched 12:00Z, 11.2 hours before the alert went out and 147 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: 1830 J/kg
Mixed-layer CIN: -70 J/kg
Mixed-layer LCL: 816 m above ground
0-6 km bulk shear: 34 kt
0-1 km storm-relative helicity: 71 m²/s²
0-3 km storm-relative helicity: 133 m²/s²
Significant tornado parameter: 0.6
Supercell composite: 5.3

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
Jun 12, 8:00 PM CDT	Severe Thunderstorm Watch	SPC	Beauregard, Calcasieu, Cameron, Vernon	5 hr
Jun 12, 9:51 PM CDT	Mesoscale Discussion	SPC	Beauregard, Calcasieu, Cameron, Vernon	54 min
Jun 13, 12:16 PM CDT	Mesoscale Discussion	SPC	Allen, Beauregard, Calcasieu, Grant, LaSalle, Natchitoches and 3 more	119 min
Jun 13, 3:20 PM CDT	Severe Thunderstorm Watch	SPC	Acadia, Allen, Ascension, Avoyelles, Beauregard, Calcasieu and 21 more	5 hr

Nearby

Mesoscale Discussions in Louisiana, 2003 Mesoscale Discussions in Mississippi, 2003 Every mesoscale discussion in 2003

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.