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<br />~H' ~ i' ~J 1 <br />-(. :) -=- U l ..L. <br /> <br />~ <br /> <br />c. Precipitation usually occurs as rain during the s~r and so~times <br />in late spring and early fall. An annual average of 40 thunderstorms occur <br />in the basin, mostly in s~r, resulting in high-intensity but short-dura- <br />tion rainfall. The largest general rains follow the inflov of ......~r trC))'- <br />ical air from the Eastern Pacific or from the Gulf of ~x1co. Notable <br />storms of this type occurred on 4-6 October 1911, 6-13 September 1927, <br />1_3 June 1943, and 11-13 June 1947. Snow falls during late autumn, vinter, <br />and early spring, constituting a considerable percentage of the annual pre- <br />cipitation over the watershed. On the average, 4 to 6 feet of snow accumu- <br />late at the higher elevations of the basin reaching a maximum depth in late <br />March or early April. Average seasonal accumulation of snov at McClure <br />Pass (the snow course located vithin the basin) is Il;iven in the folloving <br />table: <br /> <br /> McClure Pass Snow Course ( <br /> (Elevation 9.500 ft. ) <br /> Avg. snow Avg. \l&ter Period of Years of <br /> rate depth ( in. ) content (in.) : record ,""card <br /> 1 February 41 11.6 1953-67 13 <br />e 1 /oBrch 49 14.6 " " 14 <br /> 1 April 46 14.6 " " 15 <br /> 1 /oBy 24 9.3 " " 15 <br /> <br />" <br />'6, <br />."" <br />~. <br /> <br />The maximum snow depth of 74 inches (\I&ter content 28.6 inches) \l&S <br />measured at McClure Pass snov course on 1 April 1952. <br /> <br />',.. <br />. :.;-.' <br /> <br />~ <br /> <br />.....' <br /> <br />6 <br /> <br />. <br />