Polar Cyclone Eggnog (2017)

Polar Cyclone Eggnog is a currently active Polar Storm threatening the Nunavut Province of Canada. The fifth named storm and third polar cyclone of the season, Eggnog is expected to pose a threat to Greenland in the future.

Meteorological History
On November 9, the Bob Nekaro Weather Center (BNWC) noted the possibility of a low pressure area expected to form over the Southern Hudson Bay the following week. The system slowly organized over the coming days, with a low pressure system forming on November 13. On November 14, the system began to show signs of organization, with an elongated low-level center of circulation developing as winds increased to polar storm force. At 03:00 UTC on November 15, the system acquired sufficient organization for BNWC to initiate advisories on a polar storm, assigning it the name Eggnog.

Initially, Eggnog remained disorganized, with a broad center of circulation and a large radius of maximum winds. Struggling with only marginally favorable conditions including moderate wind shear and little movement, Eggnog unexpectedly weakened to a polar depression by 21:00 UTC that same day. The next day, Eggnog's central pressure began to fall as it began to consolidate an inner core, though it remained somewhat large. Eggnog restrengthened into a polar storm by 03:00 UTC on November 17, at the time it began to move faster to the north-northeast over the central Hudson Bay. Decreasing wind shear allowed a period of rapid intensification for the next 24 hours, with Eggnog strengthening into a Weak Polar Cyclone by 03:00 UTC on November 18. Eggnog subsequently made landfall in Southampton Island, Nunavut at this time, with maximum sustained winds of 75 mph and an estimated minimum pressure of 983 mb. An oil rig recorded a sustained wind of 69 mph and a minimum pressure of 985.2 mb in Eggnog's northeastern quadrant shortly before landfall.

Steady weakening occurred on November 18 as Eggnog's structure began to lose organization over the rugged terrain of Nunavut. Eggnog weakened to a polar storm by 09:00 UTC that morning, and continued to weaken later that day.