With the current weather conditions expected to last into the weekend, those fishing or recreating on a midvalley stretch of the Roaring Fork River this week need to be careful of more ice breaks and high water, officials are warning. There have been at least two ice jam releases in the past month, and the National Weather Service office in Grand Junction has issued a “hydrologic advisory” through 3:15 p.m. Sunday for the section of the river from Snowmass Canyon to Carbondale. Kris Sanders, a meteorologist at the Grand Junction office, said Wednesday the weather pattern of cold nights and fast warming during the day in the forecast increases the potential for ice build up and potential releases.