Living in the Edmonds area, we often see gusty winds during the day...which die off in the evening-what causes this?
Such winds are what we call 'sea breezes'. They result from the sun heating the land more rapidly than water on partly to mostly sunny days when otherwise wind would be light. As the land heats more rapidly, the warming air rises, creating an area of lower pressure...at least compared to the cooler air over water. As a result, the cooler, higher pressure air over the water moves toward the warmer, lower pressure air over land...generating increasing winds during the afternoon hours. Such winds typically tend to die off as the sun gets lower in the sky and heating diminishes...which is why the winds ease during the evening. By the way, this doesn't just impact the Edmonds area, but any area close to the shoreline.