▁to ▁ 2 0 0 5 ▁were ▁P DS ▁watch es , ▁or ▁an ▁average ▁of ▁ 2 4 ▁each ▁year . ▁When ▁a ▁P DS ▁watch ▁is ▁issued , ▁there ▁are ▁often ▁more ▁P DS ▁watch es ▁issued ▁for ▁the ▁same ▁weather ▁system , ▁even ▁on ▁the ▁same ▁day ▁during ▁major ▁out break s , ▁so ▁the ▁number ▁of ▁days ▁per ▁year ▁that ▁a ▁P DS ▁watch ▁is ▁issued ▁is ▁significantly ▁lower . ▁ ▁Background ▁The ▁short ▁history ▁of ▁the ▁origin ▁of ▁the ▁option ▁of ▁issu ing ▁a ▁torn ado ▁watch ▁with ▁the ▁en hanced ▁Part icular ly ▁D anger ous ▁Situ ation ▁( P DS ) ▁word ing ▁occurred ▁during ▁the ▁winter ▁of ▁ 1 9 8 1 - 8 2 ▁when ▁the ▁Se vere ▁Local ▁Storm s ▁( SE LS ) ▁unit ▁transition ed ▁to ▁a ▁more ▁flexible ▁method ▁of ▁issu ing ▁weather ▁products . ▁Ed ▁Fer g us on , ▁Deput y ▁Director ▁of ▁the ▁National ▁Se vere ▁Storm s ▁Fore cast ▁Center ▁( N SS FC ), ▁suggested ▁to ▁Le ad ▁Fore c aster ▁Jack ▁H ales ▁that ▁the ▁guidance ▁center ▁could ▁provide ▁an ▁opportunity ▁to ▁give ▁more ▁resolution ▁to ▁the ▁torn ado ▁watch ▁product . ▁H ales ▁suggested ▁the ▁P DS ▁option ▁to ▁identify ▁areas ▁where , ▁a ▁few ▁times ▁each ▁year , ▁conditions ▁are ▁most ▁likely ▁to ▁aid ▁in ▁the ▁development ▁of ▁large ▁and ▁inten se ▁torn ado es . ▁The ▁first ▁P DS ▁torn ado ▁watch ▁was ▁issued ▁by ▁Robert ▁H . ▁Joh ns ▁for