Mid-September usually finds relaxed tourists ambling through early fall sun in the Rocky Mountain Na-tional Park gateway town of Estes Park. They browse for food, souvenirs and sights. Elk coming down from the high country and wandering through the town often supply the latter.But Sept. 12, 2013, found residents ducking inside to avoid the rain. September rainstorms — if they come at all — are usually 30-minute-to-an-hour affairs. About an inch and a half of precipitation is typical for a northern Colorado September.A low pressure system stalled along the foothills and Front Range east of the Rockies in September 2013.
