Wind gusts of 50 to 70 mph in the mountains and 30 to 50 mph on the coasts and valleys are forecast for Los Angeles and Ventura counties on Wednesday. Residents exhausted by days of fire face red flag warnings with the rare "particularly dangerous situation" designation issued for those counties through Wednesday afternoon.

LAFD Chief Kristin Crowley said the department has staffed all available resources and fire patrols and engines are being strategically placed in the high-fire risk areas of the city.

Here's a guide to understanding "particularly dangerous situation" red flag warnings, containment, and other terms related to the devastating fires that have left much of the LA area in ruins.

Red flag criteria is generally when relative humidity is at 15% or less, combined with sustained winds and/or gusts of 25 mph or greater. Both of these conditions must occur simultaneously for at least 3 hours in a 12 hour period, according to the NWS.

Cal Fire crews are responding to the scene of a brush fire in Ramona that broke out early Tuesday morning, threatening at least one structure.

A brush fire that sparked Tuesday morning in Ramona amid a red flag warning, was stopped by Cal Fire San Diego crews. The fire was reported near Pamo Road and West Haveford Road. Calfire said the fire grew to 10 acres and was threatening one structure.

A brush fire erupted in Ramona amid a Red Flag Warning Tuesday morning, prompting a quick response from Cal Fire crews.

A Red Flag Warning lasts across the San Diego County mountains and inland valleys from Monday night until Wednesday at 6 p.m.