Hikers and outdoor enthusiasts in the Adirondack High Peaks should prepare for changing weather conditions, including potential rain and thunderstorms, particularly on Sunday. Those venturing to higher elevations should be aware of colder temperatures and wind chills near freezing on Monday. Additionally, some trails, such as the Shallow Lake Trail in the Pigeon Lake Wilderness, remain impassable due to beaver activity. Flooded sections of the Northville-Placid Trail in the West Canada Lakes Wilderness may also pose challenges. River and lake levels are below normal, which could impact water-based activities.