Overview
- Active National Weather Service warnings through Dec. 20 call for heavy mountain snow up to about 23 inches and gusts near 120 km/h across Alaska, Idaho, Montana, Michigan, Oregon and Washington.
- Avalanche danger and difficult travel are highlighted for high passes and corridors such as Lookout, Lolo and Marias, with impacts extending to some lower‑elevation communities.
- Argentina’s meteorological service maintains multiple yellow alerts for storms, extreme heat and strong winds in several provinces, warning of frequent lightning, occasional hail and 30–70 mm of rain.
- The SMN upgraded Córdoba to an orange alert spanning Dec. 19–21 windows, forecasting locally severe storms with gusts up to 90 km/h and heavy rainfall that could reach 80–110 mm in some periods.
- AEMET projects rain and possible storms in Spain into the Christmas period, including a sharp temperature drop and a snow level near 900 m in Córdoba, while Galicia local forecasts show a higher storm probability on Dec. 20.