This week will be divided up into two distinct weather patterns…starting with warm and clear conditions through Thursday, and changing into a cooler and wetter pattern that will likely go through the weekend. Sunshine on Tuesday will help boost high temperatures in Reno into the high 60s, and will continue to rise to near 80 degrees by Thursday. Starting Friday, a sub-tropical low pressure system will move into the region, bringing a good chance of showers and cooling us down to the 60s from Saturday through Monday.

Sunday I talked about flooding due to ice jams. But some of history’s largest floods occurred because the ice… un-jammed.

missouls flood

About 13,000 years ago, at the end of the Pleistocene Ice Age, glaciers dropping out of Canada dammed the drainage in western Montana, creating Glacial Lake Missoula, a huge expanse of water about half the size of Lake Michigan. As the ice retreated, the “dam” would periodically fail cataclysmically. The sudden onrush of a Great Lake’s worth of water inundated an area covering much of present day eastern Washington. More tomorrow.