A graphic explains why this phenomenon occurs. Often, the heaviest snow falls over the highest elevations of mountain ranges. A graphic compares the snowfall at two locations in Utah, which are very close together, but are at different elevations. A graphic shows why rainy weather often causes mud slides in hilly areas. Topography is often a key factor in the daily weather of mountain ranges.
Mountain streams can become raging torrents when heavy rain falls.
A graphic and text tells why flood waters are so dangerous . Another graphic shows how warm air flowing up the side of a mountain can spawn massive flooding in the Pacific Northwest. Upslope flow Winds that blow uphill are called upslope winds and can bring fog, rain and snow.