SUNadARYSynoptic and meso-scale precipitation and airflow patterns in the occluding d e p d o n which passed over England and Wales on 8-9 March 1%7 m Wysed. Larpscale circulations arc illustrated in terms of airtlow relative to the synoptic system within the framework of surfaces of constant wet-bulb potential temperature (&). Meso-scale pdpitation and airflow con6gurations are i n f n r e d from a sequence of over 120 large-scale maps of 13-min precipitation amounts, There wamo obvious 'conveyor belt' in the occluding depression, but the upward relative flow coincided closely with large rain areas of the warm front and the depression centre. Subsidence at the cold front and within the warm sector inhibited precipitation growth in those parts of the depnssion.Large (200 x 50 km) and small (50 x 50 km) meso-scale rain areas were found in the depression. The latter resulted from clusters of generator cells, which formed in an area w h m potential instability was released by largescale upward motion. The clustmr moved with the winds at about 550 mb. The large meso-scale rain area lay at a small angle to the surface warm front and lasted for about three hours. Its size, location, and orientation were due to the movements of three small meso-scole systems within the relative flow at their generator level. The location and intensity of a small meso-scak rain area on the eastern flanks of the Pennines, together with the associated rainshadow to the west of the upland, were analysed with the aid of a modified lee-wave equation. Other d meso-scale precipitation areas were due to airtlow over sub-synoptic deformations in the 8, surfaces. All types fit into a two-tier scaling of -scale circulations in frontal zones.