The National Weather Service (NWS) cautions that a red flag warning indicates critical fire weather conditions are either underway or likely to develop shortly. Conditions can include a ...

according to the National Weather Service.Criteria for a red flag warning include a relative humidity less than 15%, warm temperatures and high winds for several hours and dry vegetation in an ...

Meteorologists issued a red flag warning due to fire weather conditions on May 12 in central Arizona, according to the National Weather Service. The red flag warning will be in effect from noon to ...

A red flag warning means warm temperatures, very low humidity, and stronger winds are expected to combine to produce an increased risk of fire danger, according to the National Weather Service.

The National Weather Service advises: This article originally appeared on Arizona Republic: What is a red flag warning? Here's what to know about the weather alert in Arizona ...