▁along ▁the ▁g ulf ▁coast ▁on ▁the ▁morning ▁of ▁December   2 5 . ▁Meanwhile , ▁a ▁cold ▁front ▁and ▁dry ▁line ▁had ▁formed ▁to ▁the ▁south west ▁of ▁the ▁surface ▁low ▁and ▁advanced ▁east ward ▁through ▁the ▁morning , ▁providing ▁a ▁source ▁of ▁lift ▁for ▁con ve ction ▁to ▁form ▁in ▁eastern ▁Texas . ▁Initial ly , ▁the ▁con ve ction ▁con ge aled ▁into ▁a ▁quasi - linear ▁con ve ct ive ▁system ▁while ▁over ▁n ortheast ▁Texas ▁and ▁western ▁Louisiana , ▁with ▁only ▁a ▁few ▁torn ado es ▁touch ing ▁down ▁in ▁these ▁areas . ▁Later ▁in ▁the ▁afternoon , ▁enough ▁energy ▁associated ▁with ▁the ▁adv ancing ▁short wave ▁tr ough ▁allowed ▁for ▁the ▁formation ▁of ▁discrete ▁torn adic ▁super cell s ▁ahead ▁of ▁the ▁adv ancing ▁squ all ▁line ▁in ▁Louisiana , ▁southern ▁Mississippi , ▁and ▁southern ▁Alabama , ▁and ▁around ▁the ▁same ▁time , ▁the ▁S PC ▁issued ▁a ▁Part icular ly ▁D anger ous ▁Situ ation ▁( P DS ) ▁torn ado ▁watch ▁for ▁extreme ▁eastern ▁Louisiana , ▁southern ▁and ▁central ▁Mississippi , ▁and ▁western ▁Alabama . ▁Sou ther ly ▁wind s ▁near ▁the ▁surface ▁increased , ▁providing ▁strong ▁low - level ▁and ▁deep ▁layer ▁wind ▁she ar ▁needed ▁for ▁these ▁cells , ▁which ▁would ▁later ▁produce ▁torn adic ▁activity . ▁By ▁late - even ing , ▁most ▁storm s ▁had ▁con ge aled ▁into ▁a ▁squ all ▁line ▁and ▁weak ened ▁due ▁to ▁w an ing ▁inst ability . ▁ ▁In ▁the ▁early ▁morning ▁of ▁December