The National Weather Service this week issued a "critical fire weather" warning for the North Bay Hills -- including those in Napa County -- for the next several days.
"Critical Fire Weather Conditions are expected to develop across the area over the next several days," the agency said in a statement.
"Strong and gusty northerly winds will combine with falling relative humidity in an offshore flow to produce critical fire weather conditions," the Weather Service said.
"Despite the rainfall of the past weekend," the agency said, "there have been several days of sunny and dry weather which have contributed to drying out the fuels available to burn."
In a related warning, the Weather Service declared a "hazardous weather watch" above 1,000 feet through 3 p.m. Friday.