Source of Mountain Snowstorms StormsalongtheWestSlopeoftheUS Storms West of Storms on the East Slope of the Rockies Annual Mean SnowfallAnnual Mean Snowfall East of the Rockies except locallyaroundt ID: 172972
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Storms aOonJ tKe West SOope of tKe US East of tKe RocNLes e[cept OocaOOy around tKe *reat /aNes and AppaOacKLan MountaLns snoZfaOO Lncrease from soutK to PacLfLc tKe amount of snoZfaOO Ls reOated to eOevatLon and AOO tKe mountaLn ranJes are Water from ZLnter snoZfaOOs Ls Water from meOtLnJ snoZ aOso provLdes KydroeOectrLc poZer Jenerated Ln tKe Zestern states.monLtored by NatLonaO WeatKer ServLce State Department of TransportatLon and tKe Forest PercentaJe of poZer Jenerated by KydroeOectrLc pOants Ln 2006 From Zest to east tKe maMor mountaLn ranJes LncOude tKe Sierra Nevada tKe Wasatch Range and tKe TKe cKaracterLstLcs of Keavy snoZfaOOs on eacK of tKese mountaLns vary because of tKeLr dLstance to moLsture sources and tKeLr eOevatL SnoZstorms Ln tKe mountaLn of Zestern NortK AmerLca deveOop durLnJ tKe passaJe of OarJe-scaOe ZeatKer systems sucK as e[tratropLcaO cycOones fronts and upper-OeveO trouJKs over tKe mountaLn ranJes.Many of tKese ZeatKer systems and Zestern PacLfLc Ocean.TKe moLsture streams Ln tKe atmospKere are concentrated aOonJ tfrontaO systems assocLated ZLtK e[tratropLcaO cycOones.TKese moLsture streams are termed ³atmospKerLc rLvers´. StronJ cycOones deveOop reJuOarOy over tKe PacLfLc prLmarLOy soutK and east of tKe AOeutLan IsOands of Most of tKese cycOones arrLve at tKe West Coast durLnJ tKeLr occOuded staJe ZLtK very deep TKunderstorms are rareOy found ZLtK cycOones tKat orLJLnate ovecoOd NortK PacLfLc Ocean because tKe surface aLr temperatures arareOy Zarm enouJK to cause buoyancy-Lnduced convectLons. OroJrapKLc/LftLnJMountaLns bOocN tKe fOoZ ZLtKLn tKese OarJe ZeatKer systems caOOed oroJrapKLcOLftLnJ. PrecLpLtatLon due to CoastaO RanJe PrecLpLtatLon due to Cascades PrecLpLtatLon due to SLerra Nevada TKe term ³upsOope storm´ Ls used to descrLbe a ZLnter storm tKaoccurs aOonJ tKe eastern sOopes of tKe RocNy MountaLns and on tKe POaLns dLrectOy east of tKe mountaLns.TKese storms occur ZLtK OoZ-OeveO ZLnds tKat Kave an easterOy UpsOope storms can produce enormous amounts of snoZ. can faOO durLnJ a sLnJOe event tKe footKLOOs Zest of Denver. UpsOope storms occur ZKen reOatLveOy moLst easterOy ZLnds bOoZ ZestZard across tKe pOaLns and up tKe east sOope of TZo pressure patterns produce easterOy ZLnds: 1 a KLJK-pressure system Oocated nortK of tKe CoOorado and 2 a OoZ-pressure system Oocated soutK of CoOorado.For tKe KLJK-pressure system coOd and reOatLveOy dry CanadLan aLr produces OLJKt For tKe OoZ-pressure system Zarm and moLst aLr from *uOf of Me[Lco produces snoZ ZLtK KLJKer Zater equLvaOent.E[ceptLonaOOy bOL]]ards occur ZKen botK pressure patterns occur sLmuOtaneousOy. CoOd aLr from tKe KLJK-pressure system to tKe nortK Warm aLr from tKe OoZ-pressure system to tKe soutK