More than 15 million people in California, including Los Angeles, San Francisco and Sacramento, are under fire warnings due to dry and windy conditions.

Relative humidity as low as 5% is forecast in some locations, along with wind gusts of up to 90 km/h. These conditions, combined with the dry soil and vegetation, can make fires both start and spread more easily.

California Fire says they have increased staffing levels in the state for the duration of the Red Flag warnings. The warnings are currently in effect until Saturday afternoon.

A fire near and in Oakland — dubbed the Keller fire — started Friday and has affected two homes, threatening dozens. According to the latest official incident report, the fire is 35% contained and has destroyed 40 acres in Alameda County. Evacuation orders and warnings have been issued.

Another fire that started Friday, called the Mission Fire, near Riverside is 40% contained after burning 40 acres. The progress of the fire has stopped.

The third fire that ignited Friday was between San Francisco and Sacramento – called the Hay Fire – and is 70% contained after burning 869 acres in Solano County, outside Fairfield, near Travis Air Force Base.

Tropical Storm Nadine

Tropical Storm Nadine made landfall near Belize City, Belize at noon ET with winds of 60 mph. Up to a foot of rain is possible in the mountainous region of inland Belize and parts of southern Mexico in the coming days.

Nadine is expected to weaken significantly as it moves inland, with the National Hurricane Center expecting the hurricane to dissipate over southern Mexico by late Sunday.

Nadine has sustained winds of 50 miles per hour and is moving west at 8 miles per hour.

Tropical Storm Warnings are in effect from Belize City, Belize, to Cancun, Mexico, including Cozumel.

According to forecasts, Nadine’s center is expected to make landfall along the coast of Belize late Saturday or around noon, then continue through northern Guatemala and southeastern Mexico late this afternoon.

Widespread precipitation amounts of 4 to 8 inches are expected with Nadine in northern Belize, northern Guatemala and the southern Mexican states from Quintana Roo westward to Veracruz.

Isolated areas with amounts greater than 30 cm are also possible until late Tuesday.

Minor coastal flooding is possible in areas with onshore winds near and north of where the center is moving inland.

Hurricane Oscar is forming

Newly formed Hurricane Oscar has rapidly strengthened near Turks and Caicos with winds of 80 mph. Just three hours after it was named a tropical storm, the National Hurricane Center upgraded Oscar to a hurricane, with hurricane hunter planes noting the storm’s small size.

Oscar has 24 hours to continue to strengthen before unfavorable conditions prevail.

A hurricane warning is in effect for the islands of Turks and Caicos, the southern Bahamas and parts of Cuba. From Turks and Caicos Islands to Cuba, precipitation amounts of 5 to 15 centimeters are possible.