Explosive cyclogenesis in the NW Pacific Ocean

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A low pressure system in the Northwest Pacific Ocean has deepened 58 hPa in 24 hours ending January 10, 2019, producing hazardous conditions across the Pacific. 58 hPa in 24 hours is more than double the threshold (24 hPa in 24 hours) for ‘explosive cyclogenesis’ also known as ‘bombogenesis’ and ‘bomb cyclone.’ 

This hurricane-force low is producing hazardous marine conditions, including winds to 148 km/h (92 mph) and widespread phenomenal seas with highest significant wave heights to 17.28 m (56.71 feet).

This is a strong indicator that major swell is on the way for the Hawaiian Islands this weekend and sizable swell for the West Coast U.S. early next week.

Despite this impressive low-pressure reading, we expect minimal impacts to those living and working on land in the Aleutian Islands: plan for a stiff breeze by Alaskan island standards, NWS Anchorage said January 10. 

For mariners and those transiting the Great Circle shipping route, storm avoidance procedures are warranted. Seek safe harbor, and monitor Marine VHF and US Coast Guard messages for further details.

Featured image credit: NASA/NOAA Suomi NPP/VIIRS

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