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Glossary Index

Avalanche Institute


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Precipitation Intensity Factor (P.I. factor)


Index of possible hazard due to direct action soft slab avalanches. Use average P.I.

(average P.I.) x (No. hrs wind above critical level) (average P.I. of 0.15 in/hr.; High winds for 10 hrs. = P.I. factor of 1.50. Normally a P.I. factor over 1.00 indicates high avalanche hazard.

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