Sentinel-1A overflew Hawai’i and Maui near sunrise on 20 July 2023, measuring the surface winds surrounding those islands. The mp4 animation above (click here for an animated gif) shows GOES-18 visible imagery (Band 2, 0.64 µm) from 1601 to 1801 UTC. The animation includes toggles at 1616 UTC when Sentinel... Read More

GOES-18 Night Microphysics imagery from 19 July 2023, above, shows a disorganized Tropical Storm Calvin moving south of Hawai’i before sunrise on 19 July. The low-level swirl of the system is apparent to the south of the Big Island; convection associated with the system develops during the animation over Hawai’i,... Read More

GOES-18 data above show persistent convection around Samoa and American Samoa between 0400 and 0730 UTC. Sentinel-1A overflew the region just after 0550 UTC, yielding information about wind features. At that time, a convective storm was developing in between Tutuila and Upolu. The animation below steps through the Band 13... Read More

Following the eruption on 14 July, another explosive eruption of Mount Shishaldin began just before 0530 UTC on 16 July 2023 — radiometrically-retrieved GOES-18 (GOES-West) Ash Loading (above) and Ash Height (below) products from the NOAA/CIMSS Volcanic Cloud Monitoring site indicated moderate to high amounts of ash loading, existing at heights within the 4-10... Read More