Dash 8-100
Flight Crew Air Transport Pilot (ATP)
Situational Awareness
Conflict Airborne Conflict; Deviation - Altitude Excursion From Assigned Altitude; Deviation / Discrepancy - Procedural Clearance
Flight Crew FLC complied w / Automation / Advisory; Flight Crew Took Evasive Action
Human Factors; Weather
We were level at 11;000 feet in cruise; ATC issued a traffic advisory. We requested a turn away from the traffic to avoid getting into a build up. A few seconds passed and the traffic was indicating 300 feet above. An RA was complied with causing us to enter a build up. We descended approximately 500 feet. After the RA cleared we climbed back up to our assigned altitude. The traffic that we responded to was not at the appropriate altitude for flight and was not talking to ATC. We responded to the RA; notified ATC
A Dash 8 First Officer reported receiving an RA in cruise and following the RA commands caused them to enter a buildup.