The measurement of precipitation on a windy mountain summit (Results of experiments on Mount Washington, New Hampshire)

On Mount Washington the problem of precipitation‐measurement is complicated by the extremely high wind‐movement, and by topographic peculiarities of the summit. With a minimum monthly average movement of 25 mi/hr (11.2 m/sec) and a maximum of 59 mi/hr (26.4 m/sec) as recorded in 1933, with extremes frequently above 100 mi/hr (44.7 a/sec), reaching at times 150 to over 200 mi/nr (67 to 100 m/sec), the problem is chiefly reduced to the elimination of the direct disturbing effects of the wind at the rim of the gage, and the Influence of topography on the distribution of precipitation on various sectors. The conical shape of the summit with slopes of various inclination and the presence of several buildings and other obstructions made necessary the placing of several gages at cardinal points with respect to the summit.