The National Weather Service in Sacramento reports that the region is preparing for its first significant precipitation of the Water Year, including rainfall, mountain snow, and possible thunderstorms through the weekend. Northern Californians are advised to stay informed and prepare for the incoming weather as a low-pressure system brings gusty southerly winds and rain starting Wednesday afternoon. Precipitation is expected to arrive from the northwest later today.
According to the National Weather Service, the forecast calls for two distinct waves of wet weather: the first from Wednesday evening through Thursday, and a potentially stronger wave arriving Friday afternoon and continuing into Saturday. The forecast warns of a 15-20% chance of thunderstorms in the Valley and Foothills during the second wave, which could bring heavy rain, dangerous lightning, and gusty winds. Residents near the Park Fire burn scar should be especially cautious due to the increased risk of debris flows.
A Winter Weather Advisory is in effect from 11 PM tonight until 5 PM Thursday for elevations above 6,000 feet in the northern Sierra, warning of slick roads and travel delays. The National Weather Service predicts snow levels will start around 5,000 feet Thursday morning and rise to about 6,000 feet during the day. Snowfall is expected to be between 6 and 12 inches, with some areas possibly receiving up to 22 inches.
Looking ahead to Sunday, drier conditions are expected as upper ridging develops in Northern California. This change will bring warmer temperatures, but the National Weather Service warns of gusty north-to-east winds from Sunday into Monday night. Humidity levels will remain well above critical fire weather thresholds. High temperatures will likely stay just below normal through Wednesday.
For travelers, especially those using mountain passes, it's important to stay updated on road conditions. The National Weather Service recommends checking quickmap.dot.ca.gov before heading out for safe travel through affected areas. With variable conditions likely impacting aviation as well, travelers should expect potential delays and plan accordingly.
