The Bay Area is heating up, and there's no cool-down in sight anytime soon. The National Weather Service in San Francisco issued an Excessive Heat Watch effective Tuesday morning through Friday evening for the entire San Francisco Bay Area. The interior regions face triple-digit heat, while coastal areas should expect relatively cooler temperatures due to the persistent onshore flow. The weather shift is attributed to a strengthening surface high-pressure system and a large upper-level ridge moving inland, per the National Weather Service forecast discussion.

While the coast stays cool with temperatures in the 60s and 70s, landlocked denizens will see the mercury soar into the upper 80s to mid-90s by next week, with even hotter conditions expected on Tuesday. For residents in North and East Bay areas and interior regions of Monterey and San Benito Counties, the heat could be punishing, with the NWS forecasting highs potentially up to 110 degrees in some local hot spots. The National Weather Service warns, "An Excessive Heat Watch is issued when dangerous heat is possible in the coming few days." This heat watch is serious business, with real concerns over public health and impacts on infrastructure and the environment, including increased fire risk.

Amid the blistering temperatures ahead, the NWS offers a silver lining with a technology update. Beginning July 1, the collection of regional temperature and precipitation data will become automated, enhancing the efficiency of the RTP product that is dispersed twice daily and encompasses area climate sites. However, all data are still preliminary and subject to revision until certified by the National Center for Environmental Information.

Maritime interests haven't been spared weather warnings either. "Fresh to strong northwest winds with gusts near gale force are expected to persist," according to the Area Forecast Discussion by the National Weather Service San Francisco CA. Small Craft Advisories are in effect for various zones in Monterey Bay and along the coast, ensuring seafarers are aware of the windy conditions that could threaten safety on the waters.

To mitigate the deleterious effects of the oncoming heat wave, the National Weather Service advises: "suspend outdoors activities between the hours of 10am and 7pm" when heat watches or warnings are in place, seek out air-conditioned spaces, and ensure you stay hydrated with plenty of cool water. The agency suggests other cooling strategies for those without access to AC or water bodies, including cold showers, sprinklers, or laying a damp towel across your body. Pet owners are prompted to be vigilantly mindful of their animals' needs, offering shade and free access to water to prevent overheating.