Natural Air Conditioning
Many factors define terroir; soil, human intervention, aspect, clone, rootstock, amongst others. Few have as much impact in defining the character of a wine as climate and weather in a given year. The fine wine growing regions in California are defined by their proximity and relationship to the ocean, and the daily interplay between sun and fog.
As noted, the last few days have seen a significant high pressure system bring us warm days and stop the typical onshore flow pattern. This picture shows the fog and cool air from the ocean creeping over the coastal hills, following the slow decline of the high pressure system. This pattern brings cool nights and afternoons which help the vines retain acidity and color, arguably defining the differences in quality between the coastal regions and the central valley of California.