The outer most contour is 4 storms in the period. Contour interval is 4 storms.
Local maxima are darker blue and minima are uncolored.
The red arrows indicate the axis of maximum values and the most common tropical storm tracks. The large blue area to the east of Puerto Rico had more than 20 but less than 24 storms during the period of record. Nowhere in the North American sector are tropical storms more common than immediately to the east of Puerto Rico. Hurricane Hugo made landfall on Puerto Rico and opened the flood gates of new scientific inquiry for the Luquillo LTER program. However many hurricanes and tropical storms have come close but skirted by just to the north or to the south of Puerto Rico.