The mercury will hit triple digits throughout the Inland Empire today and through the week, with a heat advisory taking effect and prompting the National Weather Service to urge residents to take precautions. Beginning Tuesday, SoCal will meet thresholds for significant heat impacts in the deserts and mountains, as well as portions of the Inland Empire,'' the NWS said in a statement Monday. ``It will be in the 90s each day and potentially hotter ... in the Inland Empire, where a Heat Advisory goes into effect Tuesday.'' The advisory takes effect at 10 a.m. and continues until 8 p.m. Sunday. "Take extra precautions if you work or spend time outside,'' the Weather Service stated. ``Drink plenty of fluids, stay in an air-conditioned room and stay out of the sun.'' Temps are likely to be 5 to
