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<br /> <br /> <br />.15 <br /> <br />.11) <br /> <br />35 <br /> <br />9J <br /> <br />1.:(1 <br /> <br />1)3 <br /> <br />}:jgurc 4. Trcnds in (a) )'ca.rly da.:cs of <br />spring snoVtmc1t onsct and (b) centcrs of <br />./,5 ma.ss of yearly streamflow h)'drogrnphs in <br />rh-cr.i throughout western ~octh America. <br />1:Xl.!>Cd on U.s. Geological Sun'cy stn:am- <br />llow gaging !>tations in the United States <br />.;0 and an equi\'alen. C:llI:!.dian stn:.amflow <br />network. large circles indicate ~itcs <br />with trends that ditTer significantl)' from <br />zero at a 90% contidence Ic\'e1: small <br />35 circlcs arc: no{ confidently identified. <br /> <br />a) Spring-pulse dates <br /> <br />0'0 <br /> <br />14U <br />.1 <br /> <br />120 <br /> <br />o <br />.....___ 0 <br /> <br />-?'-~ <br />r-- <br />o <br /> <br />~ g~ <br />OJ <br /> <br />b) <br /> <br />. >20 days earlier <br />. 15-20 <br />. 10-15 <br />o 5-10 <br />o <to <br />o 5-10 days later <br />o 10-15 <br />. 15-10 <br />. >20 <br /> <br />Centers of Mass <br />