Alert archive / Mississippi / Mesoscale Discussions in 2005

Mesoscale Discussion 2563

December 14, 2005Washington County, Alabama; 4 parishes in Louisiana; 21 counties in Mississippi

The Storm Prediction Center issued this mesoscale discussion at Dec 14, 2005, 9:04 PM CST for Washington County, Alabama; 4 parishes in Louisiana; 21 counties in Mississippi. It was in force for 86 min.

The area

The outline as issued.

The facts

Issued: Dec 14, 2005, 9:04 PM CST (03:04 UTC)
Expired: Dec 14, 2005, 10:30 PM CST
In force: 86 min
Issued by: the Storm Prediction Center

All 26 counties

Washington County, AL, Saint Bernard Parish, LA, Saint Tammany Parish, LA, Tangipahoa Parish, LA, Washington Parish, LA, Covington County, MS, Forrest County, MS, George County, MS, Greene County, MS, Hancock County, MS, Harrison County, MS, Jackson County, MS, Jasper County, MS, Jefferson Davis County, MS, Jones County, MS, Lamar County, MS, Lawrence County, MS, Marion County, MS, Pearl River County, MS, Perry County, MS, Pike County, MS, Simpson County, MS, Smith County, MS, Stone County, MS, Walthall County, MS, Wayne County, MS

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, 3.1 hours before the alert went out and 92 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, 9:29 PM CST	Tornado Watch	SPC	Baldwin, Coffee, Covington, Dale, Escambia, Geneva and 3 more	8 hr
Dec 15, 2:31 AM CST	Mesoscale Discussion	SPC	Coffee, Covington, Dale, Geneva, Henry, Houston	119 min
Dec 14, 7:05 PM CST	Mesoscale Discussion	SPC	Assumption, Jefferson, Lafourche, Plaquemines, Saint Charles, Saint James and 1 more	85 min

Nearby

Mesoscale Discussions in Mississippi, 2005 Mesoscale Discussions in Louisiana, 2005 Mesoscale Discussions in Alabama, 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.