It is "bud break" here in the Napa Valley. A time when the vines are shooting out new growth. It also is the most vulnerable time for these young shoots. All the vineyards have massive fans (like the one pictured above) and frost protection systems. For good reason: only cannabis gets more dollars per ton of harvest than wine grapes. The vineyard folks go to great and elaborate lengths to protect the grapes that will, within one to three years, be the 2009 vintage of some of the most expensive wine in the world.
These fans are loud. When the temperatures start to dip to the mid part of the 30 degree Fahrenheit range, they all start up. It sounds like thousands of helicopters are descending on the Napa Valley. The only time I remember it being louder here was when George Bush stayed overnight at one of the Napa Valley Resorts and they had Jet Fighters circling the Napa Valley all night.
The fans keep the air moving so that the shoots and later this spring, the flowers--won't freeze.