Key keywords: NWS, red flag warning, Thursday, wildfire risk, low relative humidity, gusty winds, critical fire weather, dry vegetation, fire safety precautions, evacuation preparedness The U.S. National Weather Service (NWS) officially issued a widespread red flag warning on Wednesday, covering most of Northern California, southern Oregon, and western Nevada, effective from 5 a.m. to 8 p.m. local time this Thursday. The warning is triggered by a combination of dangerous weather conditions that put the region at extreme risk of fast-spreading, uncontrolled wildfires. According to NWS meteorologists, the affected regions have received less than 0.1 inches of precipitation over the past 28 days, pushing the moisture content of surface dry vegetation down to 12% on average, a level far lower than the historical average of 21% for the same period. On Thursday, the region will see gusty onshore winds blowing at 25 to 35 miles per hour, with peak gusts reaching 45 miles per hour in mountainous and canyon areas, paired with relative humidity dropping as low as 10% to 15% for most of the day. These conditions mean any small ignition source, including unattended campfires, discarded cigarette butts, sparks from farm equipment or vehicle exhaust, can quickly ignite dry brush and spread into large wildfires that are extremely difficult to contain. The NWS has urged all residents and visitors in the affected areas to strictly follow fire safety protocols on Thursday: avoid all outdoor open burning of any kind, refrain from using fireworks or outdoor grills in unmarked, non-fireproof areas, and ensure all smoking materials are completely extinguished before disposal. Local fire departments have activated Level 1 emergency preparedness protocols, deploying additional patrol teams to high-risk zones, pre-positioning fire engines and water tankers in remote rural areas, and putting aerial firefighting assets including helicopters and fixed-wing air tankers on 15-minute standby. Local emergency management offices also reminded residents who live in wildfire-prone zones to prepare their emergency go-bags in advance, confirm their evacuation routes, and sign up for local emergency alert systems to receive real-time updates. Last year, a red flag warning issued under nearly identical weather conditions in the same region led to three separate large wildfires that burned over 1,200 acres of land, destroyed 32 residential properties, and forced more than 2,000 residents to evacuate. NWS officials noted that they will issue updated alerts if weather conditions shift, and advised the public to check the official NWS website or mobile app regularly for the latest information throughout Thursday.