The main region of downdraft in the forward, or leading, part of a supercell, where most of the heavy precipitation is. Compare with rear flank downdraft. See pseudo-warm front, and Fig. 7, supercell.
FORWARD FLANK DOWNDRAFT
Meaning of FORWARD FLANK DOWNDRAFT in English
Weather and meteorology English vocabulary. Английский словарь погоды и метеорологии . 2012