Offshore transport of glacial silt over the Gulf of Alaska

November 18th, 2020 |

GOES-17 True Color RGB images [click to play animation | MP4]

GOES-17 True Color RGB images [click to play animation | MP4]

GOES-17 (GOES-West) True Color Red-Green-Blue (RGB) images created using Geo2Grid (above) showed the offshore transport of glacial silt across the Gulf of Alaska during the 17-18 November 2020 period. A strong pressure gradient between an inland dome of high pressure and a low pressure system off the coast of British Columbia (surface analyses) forced strong gap winds that accelerated down glacial valleys — lofting the glacial silt from the surface and carrying it off the coast. The most notable plume on both days was streaming out of the Copper River Valley.

Metop-A ASCAT surface scatterometer winds from this site (below) revealed wind speeds in the 30-40 knot range exiting the coast of the northern Alaska Panhandle at 0536 UTC on 18 November.

Metop-A ASCAT surface scatterometer winds [click to enlarge]

Metop-A ASCAT surface scatterometer winds [click to enlarge]

Imagery from the EWS-G1 — U.S. Space Force

November 18th, 2020 |

EWS-G1 (Electro-optical Infrared Weather System Geostationary) is a U.S. Space Force mission. Images are now available on the UW/SSEC geo-browser. Full Disk images are obtained every 30 minutes. An EWS-G1 “quick-guide (pdf)”.

The five spectral bands of the EWS-G1 Imager.

The above animation shows the 5 spectral bands on the EWS-G1 imager. There is one visible band and four infrared bands.

This multi-panel image shows all the 5 bands at one given time (and showing full disk images).

Animation of the visible (band 1) from EWS-G1.
Animation of the EWS-G1 water vapor band (3).
Animation of EWS-G1 band 4, longwave infrared window.

A loop of all five spectral bands.

A day-time visible band animation over Madagascar.
A composite image with EWS-G1, GOES-17 and GOES-16 data. Credit: UW/SSEC Satellite Data Services.

The EWS-G1 was formerly NOAA’s GOES-13. Contact the UW/SSEC Satellite Data Services for information of data access / subscription, if more than the posted near realtime imagery are needed.