NOTICE: Due to mission requirements, weekly and bi-weekly products of Antarctic sea ice, to include concentration, stage of development, and peninsula charts will not be updated until further notice. Antarctic sea ice extent will continue to be updated daily. If you require mission critical support in this area, please contact the USNIC Command Duty Officer at 301-943-6977 or at nic.cdo@noaa.gov.

Latest News

Icebergs D-33A and D-33B Have Calved from Borchgrevink Ice Shelf

The U.S. National Ice Center (USNIC) has confirmed that icebergs D-33A and D-33B calved from Borchgrevink Ice Shelf in the southern Weddell Sea. As of September 01, D-33A was centered at 69°47' South and 19°14' West and measured 34 nautical miles on its longest axis and 10 nautical miles on its widest axis. D-33B was centered at 69°54' South and 20°31' West and measured 21 nautical miles on its longest axis and 12 nautical miles on its widest axis.

Iceberg A-76A Split in Half, Creating A-76M

The U.S. National Ice Center (USNIC) has confirmed that iceberg A-76A has split in half, creating A-76M in the northern Weddell Sea. The calving event was first spotted on MODIS imagery on June 03. As of June 04, A-76A was centered at 55° 32' S and 37° 22' W and measured 31 nautical miles on its longest axis and 4 nautical miles on its widest axis. A-76M was centered at 55° 26' S and 37° 21' W and measured 35 nautical miles on its longest axis and 4 nautical miles on its widest axis. A-76 first calved from the Ronne Ice Shelf in May 2021. The locations of A-76A through A-76L are still being tracked by the USNIC, while A-76I broke up and became too small to track on May 16.

The Breakup of A-76 Continues

The U.S. National Ice Center (USNIC) has confirmed that iceberg A-76J calved from A-76F and icebergs A-76K and A-76L have calved from iceberg A-76A in the northern Weddell Sea. The calving event was first spotted on MODIS imagery as early as May 21.

Five New Icebergs Have Calved from Iceberg A-76A

The U.S. National Ice Center (USNIC) has confirmed that icebergs A-76E, A76-F, A76-G, A76-H, and A76-I calved from iceberg A-76A in the northern Weddell Sea. A-76 first calved from the Ronne Ice Shelf in May 2021. A-76 calved into A-76A, A-76B, and A-76C later that month. A-76D calved on or about 28 April 2023.

Iceberg A-76D Has Calved from Iceberg A-76A

The U.S. National Ice Center (USNIC) has confirmed that iceberg A-76D calved from iceberg A-76A in the northern Weddell Sea. As of April 28, A-76 was centered at 56°46' South and 42°10' West and measured 19 nautical miles on its longest axis and 5 nautical miles on its widest axis. A-76 first calved from the Ronne Ice Shelf in May 2021. A-76 calved into A-76A, A-76B and A-76C later that month.


Featured Products

Antarctic Ice Shelf

Antarctic ice shelf has been updated to the 2022 version and is available in GIS shapefile format.

Ross Outlook

The seasonal Ross Outlook has been produced for the 2021-2022 ice season and is now available. Click here to access.

Regional Synopsis

The U.S. National Ice Center has developed a new series charts. Regional Synopsis charts breaks out each region of the Arctic and Antarctic into a high quality regional charts along with an environment synopsis write-up. Charts will be updated weekly. Please take a look.

Animated Charts

Added animated charts of our Arctic and Antarctic MIZ, and IMS snow and ice charts.

Trivariate Products

A comprehensive look at ice conditions over a period time, from a single year to a comparison set starting from 2007. Produced for the Arctic and Antarctic.

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