The progression of fall chlorophyll concentrations for the months of July through December are shown in the left hand set of panels. Higher chlorophyll concentrations appear as warm shades whereas low concentrations appear as cool shades. The right hand set of panels show exceptional anomalies of chlorophyll concentration, those tending to exceed plus or minus one quarter of a standard deviation of the overall concentration for the field. This type of anomaly tends to highlight strong blooms in an area, the green shades, and concentrations well below the average in an area, the brown shades.  The fall bloom appears most intense in the Gulf of Maine during October, especially in the area of the Maine Coast around and south of Penobscot Bay. Some level of bloom activity can be seen on Georges Bank for all months except December, perhaps providing a reason why it was difficult to demarcate the Georges Bank fall boom. Exceptionally high chlorophyll levels are associated with areas of the eastern Gulf of Maine and the southern flank of Georges Bank during October and Nantucket Shoals during November. Exceptionally low chlorophyll concentrations appear in the western Gulf of Maine during December and along the Middle Atlantic Bight in November.