Himawari-9 Airmass RGB imagery, below, from 0000 on 4 April through 1200 UTC on 6 April 2023 (created using geo2grid) show a transition from a deep tropical airmass (deep green in the RGB with embedded clouds that are white) over the southern Marianas islands to one that is a bit dryer (more... Read More
Sentinel-1A overflew the western Hawai’ian islands late on 4 April 2023, observing surface winds around the islands of Kaua’i and Ni’ihau. The image above shows the winds overlain on top of a GOES-18 infrared image. A pronounced region of light winds extends downwind of both islands — the region in... Read More
Himawari-9 imagery for the hour surrounding an RCM-1 pass over the center of Severe Tropical Cyclone Herman, below, shows strong convection (with widespread brightness temperatures colder than -85oC — light purple in this enhancement — with isolated pixel values cooler than -90oC — in purple). Peak Synthetic Aperture Radar (SAR)... Read More
Sentinel-1A overflew the Hawai’ian islands shortly before sunrise on 15 March and the derived winds from this descending pass are shown above (they are also available here, through this website). Southwesterly flow and the topography of Oahu has excited gravity waves that are observable downstream from the island in the SAR... Read More
