▁ 2 0 1 7 ▁and ▁August ▁ 3 , ▁ 2 0 1 8 , ▁the ▁National ▁We ather ▁Service ▁We ather ▁Fore cast ▁Office ▁in ▁Ren o , ▁Nev ada ▁issued ▁P DS ▁Red ▁Flag ▁W arn ings ▁to ▁highlight ▁the ▁threat ▁for ▁potentially ▁life - th re aten ing ▁fire ▁danger ▁due ▁to ▁strong ▁g ust y ▁wind s ▁and ▁low ▁hum id ity . ▁ ▁Iss u ance ▁ ▁P DS ▁Flash ▁Flo od ▁Watch ▁ ▁P DS ▁flash ▁flo od ▁watch es ▁are ▁issued ▁when ▁there ▁is ▁a ▁higher - than - normal ▁risk ▁of ▁w ides p read , ▁life - th re aten ing ▁flash ▁flo oding . ▁These ▁watch es ▁are ▁issued ▁by ▁local ▁N WS ▁We ather ▁Fore cast ▁Off ices , ▁not ▁the ▁Storm ▁Pred iction ▁Center . ▁ ▁Below ▁is ▁the ▁first ▁P DS ▁Flash ▁Flo od ▁Watch , ▁which ▁was ▁issued ▁by ▁the ▁National ▁We ather ▁Service ▁Fore cast ▁Office ▁in ▁M emph is , ▁Tennessee ▁on ▁April ▁ 2 4 , ▁ 2 0 1 1 , ▁as ▁mentioned ▁above . ▁ ▁P DS ▁Flash ▁Flo od ▁Warning ▁ ▁P DS ▁flash ▁flo od ▁warnings ▁are ▁issued ▁when ▁there ▁is ▁a ▁higher ▁than ▁normal ▁risk ▁of ▁w ides p read , ▁life - th re aten ing ▁flash ▁flo oding . ▁Like ▁P DS ▁Flash ▁Flo od ▁Watch es , ▁they ▁are ▁issued ▁by ▁the ▁local ▁N WS ▁We ather ▁Fore cast ▁Off ices , ▁rather ▁than ▁the ▁Storm ▁Pred