D ivers ifying ▁food ▁and ▁di ets : ▁Using ▁agricult ural ▁b iod iversity ▁to ▁improve ▁nut r ition ▁and ▁health " ▁ ▁External ▁links ▁ ▁Tod m orden ▁Town ▁Council ▁▁▁ ▁Category : C ivil ▁par ishes ▁in ▁West ▁York shire ▁Category : Ge ography ▁of ▁Cal der dale ▁Category : Mark et ▁towns ▁in ▁West ▁York shire ▁Category : T own s ▁in ▁West ▁York shire <0x0A> </s> ▁A ▁Part icular ly ▁D anger ous ▁Situ ation ▁( P DS ) ▁is ▁a ▁type ▁of ▁en hanced ▁word ing ▁first ▁used ▁by ▁the ▁Storm ▁Pred iction ▁Center ▁( SP C ), ▁a ▁national ▁guidance ▁center ▁of ▁the ▁United ▁States ▁National ▁We ather ▁Service , ▁for ▁torn ado ▁watch es ▁and ▁eventually ▁expanded ▁to ▁use ▁for ▁other ▁severe ▁weather ▁watch es ▁and ▁warnings ▁by ▁local ▁N WS ▁forec ast ▁offices . ▁It ▁is ▁issued ▁at ▁the ▁dis cret ion ▁of ▁the ▁forec aster ▁compos ing ▁the ▁watch ▁or ▁warning ▁and ▁implies ▁that ▁there ▁is ▁an ▁en hanced ▁risk ▁of ▁very ▁severe ▁and ▁life - th re aten ing ▁weather , ▁usually ▁a ▁major ▁torn ado ▁out break ▁or ▁( m uch ▁less ▁often ) ▁a ▁long - l ived , ▁extreme ▁dere cho ▁event , ▁but ▁possibly ▁another ▁weather ▁ha z ard ▁such ▁as ▁an ▁exception al ▁flash ▁flo od ▁or ▁fire . ▁ ▁P DS ▁watch es ▁are ▁quite ▁un common ; ▁less ▁than ▁ 3 % ▁of ▁watch es ▁issued ▁by ▁the ▁S PC ▁from ▁ 1 9 9 6