• Major atmospheric river forecast to impact the Pacific Northwest with heavy rain and flooding risk

    ByRishav Kothari

    A major atmospheric river (AR4–AR5 possible) is forecast to make landfall over the Pacific Northwest early Monday, December 8, 2025, and persist through Wednesday, December 10, bringing multiple days of heavy rain and elevated snow levels. Ensemble guidance shows ~70–80% of members reaching at least AR4 in southern coastal Washington, with ~20–30% indicating AR5, raising the risk of widespread riverine flooding.

  • Ambae volcano erupting after months of quiet, Vanuatu

    ByTeo Blašković

    Low-level eruptive activity resumed at Ambae volcano (Manaro Voui) in Vanuatu, with intermittent ash emissions observed since December 1, 2025. Satellite imagery from Himawari-9 confirmed continuous low-level ash and gas plumes reaching up to 1.8 km (6 000 feet) above sea level, drifting northwest. The Wellington Volcanic Ash Advisory Centre (VAAC) issued its latest advisory on December 4, describing the eruption as continuous but confined within the volcano’s summit area.