Great Sitkin (ORANGE/WATCH): Slightly elevated surface temperatures observed in VIIRS MIR images from 9 Dec 2025 13:16 UTC and 9 Dec 2025 14:06 UTC (Example attached). Nothing was evident in TROPOMI images.

Associated Images:
375mAKKN-MIR-d20251209t1316093587Z.png

Associated Keywords:
Elevated surface temperatures: barely elevated;
Cloud cover: cloudy; partly cloudy;

Shishaldin (YELLOW/ADVISORY): Very small pinpoint sized thermal signal in NOAA-20 VIIRS MIR image from 9 Dec 2025 13:16 UTC (attached). This could be just a warm crater as it is exceptionally clear out there. Minor vapor emissions observed in clear web camera views throughout the day.

Associated Images:
375mAKSH-MIR-d20251209t1316093587Z.png

Associated Keywords:
Volcanic clouds: steam/water;
Elevated surface temperatures: barely elevated;
Cloud cover: mostly clear;