Ice forming in Hudson Bay, Canada

November 19th, 2013 |
Suomi NPP VIIRS 0.64 µm visible channel images

Suomi NPP VIIRS 0.64 µm visible channel images

AWIPS II images of 375-meter resolution Suomi NPP VIIRS 0.64 µm visible channel data (above) showed the growth of new ice immediately offshore in the northwestern portion of Hudson Bay, Canada during the 17 November19 November 2013 time period. The northwesterly flow of cold arctic air in the Arviat, Nunavut (station identifier CYEK) region was also producing well-defined cloud streets over the open waters of Hudson Bay.

The corresponding false-color “Snow Cloud Discrimination” Red/Green/Blue (RGB) images (below) confirmed that the brighter white nearshore features seen on the visible images were ice — ice and snow cover appear as shades of red on the RGB images, in contrast to supercooled water droplet clouds which appear as varying shades of white.

Suomi NPP VIIRS "Snow Cloud DIscrimination" false-color RGB images

Suomi NPP VIIRS “Snow Cloud DIscrimination” false-color RGB images

On 18 November, a significant amount of young pack ice motion can be seen in the 104-minute period between the 17:16 UTC and 19:00 UTC VIIRS visible images (below).

Suomi NPP VIIRS 0.64 µm visible channel images

Suomi NPP VIIRS 0.64 µm visible channel images

Daily “stage of development” ice analyses from the Canadian Ice Service are shown below.

Canadian Ice Service daily ice analysis for northern Hudson Bay (17, 18, 19 November)

Canadian Ice Service daily ice analysis for northern Hudson Bay (17, 18, and 19 November)

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