Sequencein variation of annual precipitationin the Western United States

TitleSequencein variation of annual precipitationin the Western United States
Publication TypeConference Proceedings
Year of Conference1948
AuthorsClawson, M.
Conference Name16th Annual Western Snow Conference
Series TitleProceedings of the 16th Annual Western Snow Conference
Date PublishedApril 1948
PublisherWestern Snow Conference
Conference LocationReno, Nevada
KeywordsPrecipitation statistical analysis

Precipitation data from 211 weather stations in 17 western states from 1900-1939 were collected. Annual and cumulative deviations from long term averages were calculated. The sum of the cumulative deviations was divided by the sum of the annual deviations to obtain a coefficient which is a measure of the tendency for wet and dry years to occur in sequence. A coefficient equal to one fourth the number of years denotes a regular symmetrical cycle. The results show a tendency toward cycles of dry and wet years in the northern one-third of the western states. The results are suggestive rather than conclusive.