Alert archive / Louisiana / Mesoscale Discussions in 2005

Mesoscale Discussion 2561

December 14, 20057 parishes in Louisiana

The Storm Prediction Center issued this mesoscale discussion at Dec 14, 2005, 7:05 PM CST for 7 parishes in Louisiana. It was in force for 85 min.

The area

The outline as issued.

The facts

Issued: Dec 14, 2005, 7:05 PM CST (01:05 UTC)
Expired: Dec 14, 2005, 8:30 PM CST
In force: 85 min
Issued by: the Storm Prediction Center

Counties Assumption Parish, LA, Jefferson Parish, LA, Lafourche Parish, LA, Plaquemines Parish, LA, Saint Charles Parish, LA, Saint James Parish, LA, Terrebonne Parish, LA

The watches that followed

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

Tornado Watch 896Dec 14, 9:30 PM CST

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 00:00Z, 1.1 hours before the alert went out and 104 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: 69 J/kg
Mixed-layer CIN: -12 J/kg
Mixed-layer LCL: 623 m above ground
0-6 km bulk shear: 65 kt
0-1 km storm-relative helicity: 224 m²/s²
0-3 km storm-relative helicity: 260 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
Dec 14, 9:04 PM CST	Mesoscale Discussion	SPC	Saint Bernard, Saint Tammany, Tangipahoa, Washington	86 min
Dec 14, 9:29 PM CST	Tornado Watch	SPC	Jefferson, Orleans, Plaquemines, Saint Bernard	8 hr

Nearby

Mesoscale Discussions in Louisiana, 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.