Overview
- Back‑to‑back systems are bringing widespread rain, strong onshore winds and mountain snow to California, with the first heavy wave hitting Monday and more bands through Wednesday.
- Southern California faces flood watches, rainfall rates near or above 1 inch per hour, gusts up to 60 mph and a slight risk of brief waterspouts or small tornadoes during Monday’s squall line.
- Expected totals include 1–2.5 inches for SoCal coasts and valleys with 2.5–5 inches in foothills and mountains, 1–2 inches across much of the Bay Area, and locally 4–5.5 inches in coastal ranges.
- The Sierra and Tahoe region are under winter storm warnings with 2–5 feet of snow and high avalanche danger, while a colder wave Tuesday night into Wednesday drops snow levels toward 3,000–4,500 feet and threatens the I‑5 Grapevine.
- In the UK, Met Office yellow warnings for snow and ice cover Scotland, Northern Ireland and parts of northern and central England into Tuesday morning, with icy surfaces, localized snow accumulations and gusty coastal winds raising travel disruption risks.