People in four states across the U.S. Southwest and California were warned of dangerous fire weather conditions on Monday, with dozens of counties under red flag warnings. The National Weather Service (NWS) cautions that a red flag warning indicates critical fire weather conditions are either underway or likely to develop shortly.

The National Weather Service has issued a Red Flag Warning for the Northern and Central Sacramento Valley, warning of critical fire weather conditions due to low humidity and recent warm weather, which has dried out vegetation and made it a potential fuel for fires.

The National Weather Service issued a Red Flag Warning for several northern MN counties, in effect from noon to 9 p.m.