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<br />Attachment C <br /> <br />c. .... <br /> <br />'. <br /> <br />SUSPENSION GUIDANCE FOR AVALANCHE AND SEVERE STORM <br />1978-79 FOR CENTRAL & NORTHERN PROGRAM <br /> <br />,. <br /> <br />Snll'w'm:lt;S <br />Eluton . <br /> <br />of Normal <br />24 Hr. M:lx. <br />Precip. FC~-".:....J_H20) <br /> <br />1.50 <br />2.25 <br />2.25 <br />2.25 <br />2.25 <br /> <br />And/Or <br /> <br />Previous 10 Day <br />Accumula tion <br /> <br />A. <br /> <br />Snowp,'lck less than 90% <br />LOGltiun <br />------.- <br /> <br />Rel"thoud P;tSS <br />SLcillnboat S!)}"111gS <br />Vall <br /> <br />3.50 <br />4.25 <br />4.25 <br />4.25 <br />4.25 <br /> <br />B. S,,""'p:lck 90 Lo 119% of Normal <br /> <br />B~rLhol1d Pass <br />SLl',lllll)():ll Springs <br />Vall <br />SllU\o.'lll:l::;>s <br />ElkLoll . <br /> <br />1. 25 <br />1. 75 <br />1. 75 <br />1..75 <br />1. 75 <br /> <br />2.75 <br />3.50 <br />3.50 <br />3.50 <br />3.50 <br /> <br />C. Sllowpack 120 to 149% of Normal <br /> <br />Bcrthouu Pass <br />Steamhoat Springs <br />Vail <br /> <br />S nlH,'Ill:\~; s <br />Elkl.on . <br /> <br />.6 <br />.9 <br />.9 <br />.9 <br />.9 <br /> <br />1. 75 <br />2.25 <br />2.25 <br />2.25 <br />2.25 <br /> <br />D. S"o"'pack greilt"r than 150% of Normal <br /> <br />Bcrthoud Pass <br />Slc:llnboat Springs <br />Va 11 <br />Sl\()\~tJ1\:lSS <br />Elklon . <br /> <br />.4 <br />.7 <br />.7 <br />.7 <br />.7 <br /> <br />1.25 <br />1. 75 <br />1. 75 <br />1. 75 <br />1. 75 <br /> <br />E. Addi t tonal COllt:idcration will be given to wind in each and every case. The <br />lIlusl hazardous wind speeds range from 30 Kts. to 50 Kts. To assess avalanche <br />putl'nti;}l, use LlU2 foJlowl.ng: <br /> <br />:\dd i lional Risk Factor: Low <br />------------ <br />10,000 Fl.. \.Jind Spc.ed 15 Kts. <br />1:',000 Ft. \.Jind Sp('('rl 20 <br />JI,,()()U Ft. \{ind Sllt'I.'U 25 <br /> <br />,-' <br />HUT !l..!&!:o Extreme <br />25 35 45 <br />30 40 50 <br />35 45 f 55 <br /> , <br /> , <br /> <br />F. A ~C('011d [actor to cunsider is tIle condition of the surface of the old snow. <br />If :\ prd1ull[.1.'c1 SU1lIlY & \o.'i1rm pl'l-ioJ precc'cds a storm, the new snow will have a <br />difficldt time :ldlwrillg to the old surface. To assess avalClnche potenti.al, use <br />lIlt, fo lluwi Ill..:.: <br />Ib \ 1 (' Il f I h 11m h r p 1" ~; 1 ! d t'~; : <br /> <br />SIh1\,'I\~atcr <br />20/1 <br />15/1 <br />12/1 <br />10/1 <br />a/1 <br /> <br />Ratio <br />-fB'1 <br />15" <br />12" <br />10" <br />8" <br /> <br />J <br /> <br />Will cause sliding. <br />Thl s r0'lulrcs n build up <br />proper weight. <br /> <br />Th(~ ;lhuve illllounts llced to be correlated with wind. <br /> <br />'I'll i~; l~\l id:llH'e dOC't; lwt npply LO lhawing aVRlanchcs, but should certainly enter into <br />the 11"",,..<1 Evaluation when a precipitation episode follows thawing conditions. <br />