According to the National Weather Service, a heat advisory is currently in place for the entire Bay Area and Central Coast regions, and it is expected to persist from 11 AM Monday through to 11 PM Wednesday. The advisory warns of potentially dangerous temperatures, with interior areas forecasted to hit the low to mid 100s, while coastal spots can anticipate temperatures ranging from the 80s to the mid-90s.
In addition to the heat warning, the NWS also indicates a significant Heat Risk, which could lead to multiple heat-related issues, especially for those susceptible to heat or lacking proper cooling resources. The regions affected by the advisory are advised to take precautions due to the moderate and major Heat Risk, as cited in the statement released by the National Weather Service. Residents are advised to stay hydrated, avoid excessive physical activity during peak heat hours, and seek air-conditioned environments whenever possible.
The unusual heat wave results from a high-pressure system building over the Eastern Pacific, leading to a compressed marine layer and increased temperatures. "The temperature will quickly rise under clear skies this morning," a National Weather Service bulletin articulates, with coastal areas not being spared from the heat due to offshore winds combating the usual cooling effect of the marine layer. This follows observations of near-gale force winds and falling relative humidity (RH) in the North Bay Mayacamas range, with certain peaks already encountering red flag criteria due to the heightened fire risk.
Besides the soaring temperatures, offshore winds are forecasted to continue through Tuesday night into Wednesday morning, with terrain above 2,000 ft not dipping below the mid-70s at night and RH recovery remaining poor. Although the Sea breeze is expected to bring relief later in the afternoon, the higher elevations are anticipated to endure extreme conditions, with possible red flag warnings.
For coastal areas, relief from the heat may come by Thursday, as onshore winds are predicted to return, based on NWS forecasts. Inland locales, however, might have to face elevated temperatures through Friday. While a gradual cooldown is expected over the weekend and into the early part of next week, the forecast also suggests that the heat wave could persist longer than initially anticipated. During this heat advisory, residents can visit the National Weather Service for up-to-date information and safety guidelines.
