The ongoing Sunday night into Monday storm across the central Andes keeps producing mainly upper-mountain snow through Monday before tapering out by Tuesday morning, April 21. A realistic near-term outcome is about 16-20 cm at Las Leñas, 9-11 cm at Valle Nevado, and lighter 5-8 cm amounts around El Colorado, La Parva, and Portillo.
Thursday into Friday will see the best agreement in the forecast, with a fast cold front sweeping across northern Utah, leading to a significant drop in snow levels and strong winds. Snow will start dense, with snow-to-liquid ratios improving overnight.
Flood advisories are in effect across the Bay Area as a storm system moves through the region this evening, according to the National Weather Service. The city of San Francisco and northern San Mateo County, including the cities of San Bruno, Pacifica and Millbrae, are under an advisory until 6:45 p.m., the weather service said. An advisory for western Santa Cruz County will run through 7:15 p.m. and includes the cities of Boulder Creek and Ben Lomond, according to the weather service.
