This is what you may be looking for:
Bulletin 812 for 320/1
To paraphrase: If you are in heavy rain the radalts can sense an incorrect height.
If both radalts are affected at once:
If the value detected is greater than 150' spurious autocall out and spurious ECAMs or GPWS warnings.
If value between 150' and 80'
During auto approach:
degradation of the guidance, glideslope no longer flown, excessive deviations can occur.
Variation of londitudinal pitch and or vertical speed leading to GPWS warning.
During Manual approach:
No adverse warnings but GPWS or autocall out warning may be triggered.
Had it once in very heavy rain on descent. Numerous ECAMs and a flash of GPWS.
