Light Transport
Flight Crew Instrument; Flight Crew Flight Instructor; Flight Crew Air Transport Pilot (ATP); Flight Crew Multiengine
Flight Crew Last 90 Days 60; Flight Crew Total 7250
Confusion; Distraction; Situational Awareness
Inflight Event / Encounter CFTT / CFIT
Flight Crew Took Evasive Action
Weather; Human Factors
We departed a non-controlled field for another non-controlled field 12 miles away. The flight was a repositioning flight after a long duty day. Upon our previous arrival we found the weather to be better than what the AWOS was reporting. We departed normally and leveled off at our anticipated altitude. Due to the short distance between the two fields; upon leveling we began to configure the aircraft for arrival. The weather began deteriorating which added to our already heavy workload. The aircraft began a descent that was not immediately detected by us due to the high workload. The descent prompted an alert from the terrain alert warning system. The pilot flying arrested the descent and we continued on to a normal uneventful landing.
First Officer reported receiving a GPWS warning when repositioning the aircraft in poor weather.