Red Flag Warning 01/06/2025 11:55 for California areas

...LIFE THREATENING, DESTRUCTIVE, WIDESPREAD WINDSTORM TUESDAY AFTERNOON THROUGH WEDNESDAY MORNING FOR PORTIONS OF LOS ANGELES AND EASTERN VENTURA COUNTIES-- WITH LONG DURATION OF RED FLAG CONDITIONS INTO THURSDAY-- POSSIBLY EXTENDING INTO FRIDAY... ...RED FLAG WARNINGS IN EFFECT FOR LOS ANGELES COUNTY AND MUCH OF VENTURA COUNTY---SEE TIMINGS IN HEADLINES BELOW... ...RED FLAG WARNING ISSUED FOR SANTA BARBARA MOUNTAINS INCLUDING EASTERN SANTA YNEZ RANGE TUESDAY INTO WEDNESDAY... .Offshore winds are now expected to develop rapidly early Tuesday morning, leading to an earlier start time of the Red Flag Warning for many areas. Confidence is high for a life threatening, destructive, widespread windstorm with dangerous fire weather conditions Tuesday afternoon through Wednesday morning, especially focused on the San Gabriel mountains and foothills, San Gabriel Valley, San Fernando Valley, Hollywood/Beverly Hills, coastal areas adjacent to the Sepulveda Pass, Simi Valley, and Santa Monica mountains into Malibu. Strong mountain wave wind activity will likely impact many of these areas, resulting in very strong, erratic, and damaging wind gusts, capable of widespread downed trees/powerlines, as well as widespread power outages. This windstorm will likely be as destructive as the 2011 windstorm that impacted Pasadena and nearby San Gabriel Valley foothills. While the longer duration of strong winds is expected to be focused across Los Angeles and Ventura counties, there is now expected to be a shorter duration of Red Flag conditions across the mountains of Santa Barbara county Tuesday into Wednesday. Long duration Red Flag Warnings are in effect for much of Los Angeles and Ventura counties Tuesday through Thursday, with Fire Weather Watches in effect Thursday night into Friday. This is a high end Red Flag event. Any new fires will have a high risk for very rapid fire spread and large fire growth, extreme fire behavior, and long range spotting. ...FIRE WEATHER WATCH REMAINS IN EFFECT FROM THURSDAY EVENING THROUGH FRIDAY AFTERNOON FOR POTENTIAL WEAK TO MODERATE OFFSHORE WINDS AND LOW RELATIVE HUMIDITY FOR MUCH OF LOS ANGELES AND VENTURA COUNTIES... * WINDS...Very strong/damaging north to northeast winds Tuesday into Wednesday, likely peaking in many areas between Tuesday afternoon and Wednesday morning when there is a high risk for strong mountain wave wind activity. During this peak, sustained winds of 35 to 50 mph and widespread damaging gusts of 50 to 80 mph can be expected. Strongest winds likely across the Highways 118 and 210 corridors, including the foothills of the San Gabriel/San Fernando Valleys, and Simi Valley where very powerful and destructive wind gusts of 80 to 100 mph will be likely. Some particular location of greatest concern include Sylmar, Porter Ranch, San Fernando eastward to foothill communities such as La Crescenta, Altadena, Monrovia, Azusa. and Glendora. Moderate north to northeast winds will likely persist Thursday with gusts of 30 to 50 mph, with some weakening possible by Friday. * RELATIVE HUMIDITY...Humidities 20 to 30 percent early Tuesday morning, falling to 10 to 20 percent by late Tuesday afternoon/evening. Humidities will potentially fall to single digits in some areas from Wednesday into Friday. * IMPACTS...If fire ignition occurs, conditions are favorable for very rapid fire spread and extreme fire behavior, including long range spotting, which would threaten life and property. There will be a high risk for widespread downed trees and powerlines, as well as widespread power outages. * ADDITIONAL DETAILS...Confidence is high that this will likely be a widespread destructive windstorm across portions of Los Angeles and Ventura counties with dangerous fire weather conditions. This will likely be the most destructive windstorm since the 2011 windstorm that did extensive damage to Pasadena and nearby foothills of the San Gabriel Valley.