"Baltimore Running Festival: Weather, Traffic, and Marathon Milestones"

This weekend's weather forecast includes spotty showers in the morning, followed by steadier and heavier rain in the afternoon and evening. Outdoor events such as the Seagull Century, running festival, River Valley Run, Maryland Million, and Autumn Glory may start dry or with spotty showers, but will become wetter as the day progresses. Temperatures will be chilly, starting in the 50s and not moving much. Following the storm, a cold pattern is expected to settle in the Eastern US, with a deep trough and upper-level low bringing colder temperatures and the possibility of the first frost in some areas.