Increasing fire danger in the local region has prompted red-flag warnings and advice on how to reduce wildfire risk. The National Weather Service has issued a fire weather watch for lower elevations in Northern California. The watch will be in effect from Tuesday morning until Thursday afternoon, according to the weather service's Web site. Winds will increase in the Sacramento Valley and foothill areas Tuesday morning, when high temperatures are expected to be around 86 degrees. Northerly winds of 15 to 30 mph, with gusts of up to 40 mph, are anticipated. Also contributing to the fire danger are low daytime humidity and poor overnight humidity recovery.