This wasn’t a simple bombogenesis on January 10, 2019. No, the weather got even more extreme when an extratropical cyclone exploded in a super DOUBLE BOMBOGENESIS, deepening an amazing 58 hPa in 24 hours and producing winds up to 148 km/h (92 mph) and gigantic waves up to 17.28 m (56.71 feet) off the Aleutian Islands in Alaska.
An “explosive cyclogenesis”, or bomb cyclone, has formed in the northwest Pacific Ocean, producing hazardous conditions across the Pacific.
*World Weather* Explosive cyclogenesis in the NW Pacific Ocean as an extratropical cyclone explosively deepens: 58 hPa in 24h, well above the threshold for 'bombogenesis' (24 hPa/ 24h). Himawari-8 imagery. pic.twitter.com/DNMH9156LZ— severe-weather.EU (@severeweatherEU) January 10, 2019
Weather charts show the huge storm growing in size as it swirls and makes its way across the ocean. The cyclone is swirling at an atmospheric pressure of 58 hectopascals (hPa) in 24 hours, which is well above the threshold for ‘bombogenesis’ (24 hPa in 24 hours). A super double bombogenensis!
Wow! super double #bombogenesis ? ("bomb" is an extratropical cyclone that drops its central pressure by 24 or more mb in 24 hours). Well this storm (see earlier post for satellite) is a more than double bomb with a drop from 1000 mb to 942 mb in 24 hours, that's a 58 mb drop! pic.twitter.com/qLYNOb6hn2— YouStorm (@YouStormorg) January 10, 2019
Major consequences of this rapidly deepening low include winds to 148 km/h (92 mph) and widespread giant wave formation with highest significant wave heights to 17.28 m (56.71 feet).
Monster double-bomb hurricane force storm in NW Pacific seen yesterday by #Sentinel3 ?️, 50 foot waves detected! Red line at bottom is scale, 2nd image is a zoom of the central region. Sending warning level #surf ?to #Hawaii Sat/Sun, Waimea, Jaws action likely. #bombogenesis pic.twitter.com/QRBHtwWz8u— YouStorm (@YouStormorg) January 11, 2019
Major swell may be on the way for the Hawaiian Islands this weekend and sizable swell for the US West Coast early next week.
The dramatic storm did not impact those living and working on land in the Aleutian Islands. However, it must have been pretty scary for mariners and those transiting the Great Circle shipping route.
Bombogenesis is a term used to describe powerful low-pressure systems that intensify rapidly, with the process beginning as cyclogenesis.