GOES-18 (GOES-West) Mid-level Water Vapor (6.9 µm) images (above) revealed a well-defined Foehn gap (narrow ribbon of darker blue enhancement) near the spine of the Sierra Nevada range in California, along with a broad “orographic crest cloud” (darker green enhancement) that extended eastward across southeast California into southern Nevada on 06 January 2024.The corresponding... Read More
10-minte Full Disk scan GOES-18 (GOES-West) Air Mass RGB images (above) showed a large cyclone as it deepened to a 936 hPa Hurricane Force Low while approaching the Aleutian Islands of Alaska on 02-03 January 2024 (surface analyses). The Sea Level Pressure dropped to at least 945.6 hPa at Dutch Harbor/Unalaska (METAR identifier PADU), which... Read More
As discussed in this blog post, heavy rainfall had continued across the Samoan Islands on 25 December 2023. The South Pacific Convergence Zone (SPCZ) remained in the vicinity of the Samoan Islands on that day (surface analyses) — and 1-minute Mesoscale Domain Sector GOES-18 (GOES-West) “Clean” Infrared Window (10.3 µm) images (above) showed additional pulses of deep convection that... Read More
10-minute Full Disk scan GOES-18 Air Mass RGB images (above) showed a cyclone as it intensified to a Hurricane Force Low by 0000 UTC on 24 December 2023 as it moved north across the Gulf of Alaska (suface analyses). Brighter orange-red hues in the RGB images highlighted a Potential Vortcity (PV) Anomaly within... Read More
