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<br />J.. <br />'If <br />J. <br />~<' <br />if, <br />" <br /> <br />, . <br />, <br /> <br />ATTACHHENT C <br /> <br />SUSPENSIO}l GUIDA\IlcE FOR AVALANCHE Al'!D SEVERE STORr! <br />FOR CENTRAL PROGRfu~ <br /> <br />1980-81 <br /> <br />E. Additional consideration will. be given to wind :i.n <lac:h anct' every case. The <br />most hazardous wind speeds range from 30 Kts. to 50 Kts. To assess ava-. <br />lanehe potential, use the following: <br /> <br />Additional Risk Factor: <br />10,000 Ft. Wind Speed <br />12,000 Ft. Wind Speed <br />14,000 Ft. Wind Speed <br /> <br />Low <br />15 Kts. <br />20 <br />25 <br /> <br />HDT <br />25 Kes. <br />30 <br />35 <br /> <br />High <br />35 Kts. <br />1,0 <br />I}S <br /> <br />. Extreme <br />l,5 Kts. <br />50 <br />55 <br /> <br />F. A second factor to consider is the condition of the surface of the old snow. <br />If a prolonged sunny and warm period preceeds a storm, the na~ sner" ,,'ill h,,':e <br />a difficult time adhering to the old surface. To assess avalanche potential> <br />use the following: <br /> <br />Rule of Thumb for slides: <br /> <br />Snow/Water Ratio <br />20/1 IS" <br />15/1 IS" t~ill cause sliding. <br />12/1 12" This requires a build-up prop.er weight_ <br />10/1 10" <br />~l r <br /> <br />.The above amounts need to be correlated with wind. <br />This guidance does not apply to thawing avalanc.hes, but should certainly enter. <br />into the Hazard Evaluation t<hen a precipitation episode follows thatJing <br />condi tions. <br /> <br />] ~[lI,\l.<:.~m; <br /> <br />___1 <br /> <br />-l/i...:l. .I. <br /> <br />_~1~~ .m _~_ <br /> <br />"',..... <br />