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<br />97 W/m2 in the latter part of the month. May values are normally in <br />excess of 97 W/m2 and frequently over 146 W/m2 in the last part of the <br />month. Jme values range to over 242 W/m2 and are usually in excess <br />of 146 W/m2. While these are the norm, it is not musua1 to have <br />IIUch higher March-April values; i.e., in March 1975, values averaged <br />over 97 W/m2 and ranged from - 31 to 182 W/m2. <br /> <br />SNOWPACKS <br /> <br />Snowpack depths and water content vary in response to temperatures <br />and frequent wint'er rains. Snow depths measured at the C5SL at <br />2040 m (6700 ft) elevation have ranged from 0 to 335 cm (0 to 133 in) <br />in December, from 10 to 505 cm (4 to 199 in) in January, 10 to 565 cm <br />(4 to 223 in) in February, 10 to 625 cm (4 to 247 in) in March, 0 to <br />500 cm (0 to 196 in) in April, and 0 to 430 cm (0 to 170 in) in May. <br /> <br />Snow depths and disappearance dates increase with elevation. At <br />1610 m (5300 ft) snow water content on-April 1 averages 25 cm (10 in) <br />over 45 years; however, in 1940 no snow was recorded at mnthly meas- <br />urement dates except for 40 cm (16 in) on March 1. In 1971 over <br />130 em (SO in) of snow were measured in February and March with snow <br />disappearing by late April. Usually snow melts before May 1 at this <br />elevation. <br /> <br />'"' - <br /> <br />10 <br />