The National Weather Service has issued a Cold Weather Advisory for the Seattle area due to very low temperatures, warning of health risks and advising residents to dress warmly and check on vulnerable community members.

Portland forecasts a cold week with widespread frost and temperatures below seasonal averages. Frosty nights and partly sunny afternoons with highs near 45°F are expected. Rain chances increase midweek, with possible showers into the weekend.

Austin's weather will change this week with gradually warming temperatures, reaching highs from 27 to 47 degrees, and varying conditions, from sunny to partly cloudy, with potential light showers. Winds will be breezy initially, then lighter.

A severe winter storm hits Chicago, bringing heavy snowfall, strong winds, and extremely cold temperatures. Residents face travel disruptions and dangerously low wind chills.

An Ice Storm Warning is in effect for parts of North Carolina, South Carolina, and Georgia, with potential hazard conditions including power outages and dangerous travel.

A federal nanobubble‑ozone pilot cut bacteria in treated windows but was crippled by trash and an October flood that washed gear away, renewing calls for bigger binational fixes.

NWS San Francisco predicts a mild and mostly clear week for Bay Area residents, with light winds and increasing cloud cover, and a short-term warm-up before cooler weather returns.

Cool mornings with patchy valley fog through Tuesday and only a slight chance of light rain midweek.

NWS San Diego predicts slightly warmer weather for the region with diminishing gusty winds today; inland areas may reach 70s by Tuesday. Some uncertainty lingers for Thursday and Friday's weather.

NYC Mayor Zohran Mamdani declares remote learning for public schools due to a winter storm, with preparations for safety and compliance with state-mandated school days.

Clear skies and gusty north winds tonight with choppy lakes. Sunny but cooler Sunday before a midweek warm‑up.

Boston Mayor Michelle Wu declares a snow emergency ahead of a storm, closing schools and city offices, urging compliance with regulations, and initiating a parking ban.

Forecast shows clear skies and chilly weather ahead for Salt Lake City, with temperatures ranging from lows of 21°F to highs near 53°F throughout the week.