Alert archive / Louisiana / Mesoscale Discussions in 2005

Mesoscale Discussion 1373

June 17, 200523 parishes in Louisiana; 8 counties in Mississippi

The Storm Prediction Center issued this mesoscale discussion at Jun 17, 2005, 10:16 AM CDT for 23 parishes in Louisiana; 8 counties in Mississippi. It was in force for 119 min.

The area

The outline as issued.

The facts

Issued: Jun 17, 2005, 10:16 AM CDT (15:16 UTC)
Expired: Jun 17, 2005, 12:15 PM CDT
In force: 119 min
Issued by: the Storm Prediction Center

All 31 counties

Ascension Parish, LA, Avoyelles Parish, LA, Caldwell Parish, LA, Catahoula Parish, LA, Concordia Parish, LA, East Baton Rouge Parish, LA, East Feliciana Parish, LA, Evangeline Parish, LA, Grant Parish, LA, Iberville Parish, LA, LaSalle Parish, LA, Livingston Parish, LA, Pointe Coupee Parish, LA, Rapides Parish, LA, Saint Helena Parish, LA, Saint John the Baptist Parish, LA, Saint Landry Parish, LA, Saint Tammany Parish, LA, Tangipahoa Parish, LA, Tensas Parish, LA, Washington Parish, LA, West Baton Rouge Parish, LA, West Feliciana Parish, LA, Adams County, MS, Amite County, MS, Franklin County, MS, Jefferson County, MS, Lincoln 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 494Jun 17, 11:00 AM CDT

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 12:00Z, 3.3 hours before the alert went out and 169 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: 276 J/kg
Mixed-layer CIN: -134 J/kg
Mixed-layer LCL: 1470 m above ground
0-6 km bulk shear: 21 kt
0-1 km storm-relative helicity: 33 m²/s²
0-3 km storm-relative helicity: 47 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.2

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 17, 12:50 AM CDT	Severe Thunderstorm Watch	SPC	Bossier, Caddo, De Soto, Natchitoches, Red River, Sabine	6 hr
Jun 17, 6:45 AM CDT	Severe Thunderstorm Watch	SPC	Bienville, Caldwell, Catahoula, Claiborne, Concordia, East Carroll and 14 more	4 hr
Jun 17, 11:00 AM CDT	Severe Thunderstorm Watch	SPC	Acadia, Allen, Ascension, Assumption, Avoyelles, Beauregard and 29 more	7 hr
Jun 17, 3:41 PM CDT	Mesoscale Discussion	SPC	Assumption, Iberia, Jefferson, Lafourche, Orleans, Plaquemines and 3 more	2 hr
Jun 17, 5:01 PM CDT	Mesoscale Discussion	SPC	De Soto	59 min

Nearby

Mesoscale Discussions in Louisiana, 2005 Mesoscale Discussions in Mississippi, 2005 Every mesoscale discussion in 2005

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.