A319
Flight Crew Air Transport Pilot (ATP); Flight Crew Multiengine; Flight Crew Instrument
Situational Awareness
Deviation - Altitude Overshoot; Deviation / Discrepancy - Procedural Published Material / Policy; Inflight Event / Encounter CFTT / CFIT
Flight Crew Returned To Clearance
Human Factors
Daytime; VMC; unlimited visibility.  Clears for the visual outside of WASON.  On the descent from WASON we got a terrain; terrain; the flying pilot adjusted his descent to extinguish the aural warning and continued to a landing.Severe clear; clear for the visual and the terrain in sight.Be sure your on the localizer before descending to altitude step down fixes.
A319 First Officer reported a terrain warning while in severe VMC conditions.