Notes:
From the monthly calculations (centered on the 15th of each month),
linear interpolation between months to generate the smooth
animation
- after March 15, influence of April 15th begins rapid drawdown that
proceeds through May
Features to watch:
-  coastal region, both Nova Scotia, Eastern Maine, and Western Gulf
-  Browns Bank “feeding” the NS side of the Coastal Current
-  GSC and NE Peak of Georges with higher values in early summer
-  highest values in western gulf in late winter/early spring
-  low values south of Cape Cod into Mid-Atlantic region