GOES-17 (GOES-West) Air Mass RGB and Mid-level Water Vapor (6.9 µm) images (above) showed an anomalously-deep Hurricane Force low pressure system as it approached the western Aleutian Islands and moved into the Bering Sea on 31 December 2020 (surface analyses). The peak wind gust at Shemya (PASY) was 72 knots (83 mph) at 09... Read More

1-minute Mesoscale Domain Sector GOES-17 (GOES-West) Night Fog brightness temperature difference (BTD) and “Red” Visible (0.64 µm) images (above) showed the nighttime and daytime signature of a fog/stratus layer that had persisted throughout much of the Snake River Basin in southern Idaho on 29 December 2020. Some sites along the Interstate 84 corridor were reporting... Read More

GOES-16 (GOES-East) “Red” Visible (0.64 µm) images (above) revealed the formation of a mesovortex in northern Lake Superior on 28 December 2020. Mid-lake convergence — as depicted by RAP40 model surface winds — contributed to the development of this feature.ASCAT surface scatterometer winds from Metop-A at 1537 UTC (below) provided a... Read More

A sequence of GOES-16 (GOES-East) “Red” Visible (0.64 µm) images covering the 14 December – 26 December 2020 period (above) showed that after Iceberg A68a encountered the more shallow continental shelf waters southwest of South Georgia island earlier in the month (NOAA-20 True Color RGB images, 02-13 December), the large iceberg then began to move south-southeastward, shear... Read More