Alert archive / Louisiana / Mesoscale Discussions in 2006

Mesoscale Discussion 2162

October 27, 200614 parishes in Louisiana; 4 counties in Mississippi

The Storm Prediction Center issued this mesoscale discussion at Oct 27, 2006, 5:43 AM CDT for 14 parishes in Louisiana; 4 counties in Mississippi. It was in force for 92 min.

The area

The outline as issued.

The facts

Issued: Oct 27, 2006, 5:43 AM CDT (10:43 UTC)
Expired: Oct 27, 2006, 7:15 AM CDT
In force: 92 min
Issued by: the Storm Prediction Center

Counties Ascension Parish, LA, Assumption Parish, LA, Iberville Parish, LA, Jefferson Parish, LA, Lafourche Parish, LA, Livingston Parish, LA, Orleans Parish, LA, Saint Bernard Parish, LA, Saint Charles Parish, LA, Saint James Parish, LA, Saint John the Baptist Parish, LA, Saint Tammany Parish, LA, Tangipahoa Parish, LA, Terrebonne Parish, LA, Hancock County, MS, Harrison County, MS, Jackson County, MS, Stone County, MS

The watches that followed

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

Tornado Watch 841Oct 27, 6:30 AM CDT

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 00:00Z, 10.7 hours before the alert went out and 51 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: 4 J/kg
Mixed-layer CIN: -22 J/kg
Mixed-layer LCL: 820 m above ground
0-6 km bulk shear: 38 kt
0-1 km storm-relative helicity: 267 m²/s²
0-3 km storm-relative helicity: 345 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.4

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 26, 9:05 PM CDT	Mesoscale Discussion	SPC	Bossier, Caddo, De Soto, Webster	115 min
Oct 26, 11:52 PM CDT	Mesoscale Discussion	SPC	Bossier, Caddo, De Soto, Webster	83 min
Oct 27, 6:34 AM CDT	Tornado Watch	SPC	Jefferson, Lafourche, Orleans, Plaquemines, Saint Bernard, Saint Charles and 6 more	7 hr
Oct 27, 9:14 AM CDT	Mesoscale Discussion	SPC	Plaquemines, Saint Bernard	2 hr

Nearby

Mesoscale Discussions in Louisiana, 2006 Mesoscale Discussions in Mississippi, 2006 Every mesoscale discussion in 2006

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.