First officer reported receiving a GPWS warning when repositioning the aircraft in poor weather.

Attributes
ACN	1631822
Time
Date	201903
Local Time Of Day	1201-1800
Environment
Flight Conditions	IMC
Light	Dusk
Aircraft 1
Make Model Name	Light Transport
Operating Under FAR Part	Part 91
Flight Phase	Descent
Route In Use	Direct
Flight Plan	None
Person 1
Function	Pilot Not Flying First Officer
Qualification	Flight Crew Instrument Flight Crew Flight Instructor Flight Crew Air Transport Pilot (ATP) Flight Crew Multiengine
Experience	Flight Crew Last 90 Days 60 Flight Crew Total 7250
Events
Anomaly	Inflight Event / Encounter CFTT / CFIT

Narrative:

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.

Original NASA ASRS Text

Title: First Officer reported receiving a GPWS warning when repositioning the aircraft in poor weather.

Narrative: 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.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.