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stronger and typically blow from a westerly direction much of the cool half of the <br /> year. <br /> Precipitation patterns are largely controlled by mountain ranges and elevation. <br /> Precipitation increases with elevation both winter and summer but the elevation effect <br /> is greatest in mid-winter when winds at mountain top level are typically strongest. <br /> High peaks and mountain ranges generally receive the majority of their precipitation <br /> during with winter months. Snow accumulates without melting in shaded or level <br /> areas at elevations above about 8,000 feet. When it melts in the spring, this snow is <br /> the primary source of water for much of the population of the state and provides water <br /> for extensive irrigation. Considerable effort is made every year to measure the <br /> accumulating snowpack so that water providers and resource managers can plan ahead <br /> for the coming summer. Most of the mountain snow melts during May and June when <br /> rivers reach their peak for the year. <br /> In summer, mountain peaks and ranges are effective thunderstorm generators <br /> whenever the regional air masses are sufficiently moist. Some years, local <br /> thunderstorms form nearly every afternoon in and near the mountains. The last half of <br /> July and much of August is particularly prone to mountain thunderstorms while June <br /> is often a much drier month in the high country. Snow and soft hail are possible from <br /> mountain storms even in July and August. Hikers and participants in other outdoor <br /> activities in the mountains during the summer months must be careful to avoid <br /> exposed ridges during stormy periods, as lightning poses a very serious threat <br /> throughout the summer. Lightning also triggers forest fires in drier years. <br />