Don, I have never heard of Amboy. I live on Vashon Island N47 26'51" W122 27'31". From your co-ordinants it seems to be close to the WA/OR
Border. This is intresting. I have noticed an increase in water temperature in the area of the Lightboat at the head of the Columbia
46 07' 00"N 124 30' 36"W. I have been looking for more significant data from the area but have come up short. This could be related to your prediction. Good Luck! Kathy