Overview
- NOAA/NWS forecasts a southward push of Arctic air with main impacts in Canada and the U.S., extending into Mexico between November 9 and 11.
- Mexico’s SMN reports a marked temperature drop already under way, with severe frosts expected in mountainous zones early November 7–8 and Mexico City lows near 7–9 °C.
- Conagua warns that serranas in Chihuahua and Durango could see minimums down to about −10 °C as a reinforcing front and polar trough arrive over the weekend.
- Northern Mexican states most exposed include Sonora, Coahuila, Chihuahua, Nuevo León and Tamaulipas, with Norte wind events forecast for Veracruz, Tabasco, Yucatán, Campeche and Quintana Roo.
- Argentina’s SMN issues orange alerts for strong to severe storms in Córdoba, San Luis and Mendoza with 40–80 mm rain, large hail and 70–100 km/h gusts, while broader yellow alerts cover provinces including La Pampa, Chaco, Corrientes, Entre Ríos, Santa Fe, Santiago del Estero, Formosa and Río Negro; no orange alert is in effect for the Buenos Aires metro area.