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Oregon Valleys Under Air Stagnation Advisory Through Sunday Morning

Light winds under a persistent high-pressure pattern are trapping pollution near the surface, prompting health guidance for sensitive residents.

Freeze Warning In Effect For Four Southern California Valleys This Morning

Dense Fog Advisory Issued for Willamette Valley Lowlands Until 10 a.m. Sunday

NWS Issues Early-Morning Dense Fog Alert for NYC, Long Island and Nearby Counties Until 3 A.M.

NWS Keeps Alaska Pass Under Advisory as Frost Hits Midwest and Mountain Snow Looms in the West

Dense Fog Returns to Michigan as NWS Cautions of Repeat Morning Hazards This Week