Washington's growing regions are mostly protected from the maritime climate by the Cascade mountains.
This is what is called the rainshadow effect, and serves to keep the eastern side of the mountain ranges drier and more arid.
Arid is a lack of precipitation, not a heat factor.
Drip irrigation can be used, not to grow grapes, but to keep the vines from shutting down and dying.
Drought = no water
Heatwave = heat and no water
On the Seattle side, they grow grapes in Woodenville, where they receive 11 inches over the growing season, and on the eastern side of the Cascades, near Walla Walla, they receive from 1.5 to 3 inches
Style of wines are imparted by the effects of heat and water.
Areas with more more rainfall, tend to have sandier, more porous soil that drains well.
Drier areas have less drainage, retaining water for growth
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