Hurricane Philippe (2017-Bob)

Hurricane Philippe was an erratic and unusual hurricane that initially developed over the Southwestern Caribbean Sea in late October 2017. The record-tying seventh major hurricane of the season, Philippe became one of the strongest Atlantic hurricanes in the month of November.

Meteorological History
In late October, a large monsoonal gyre developed over Central America. A small low pressure system developed within the gyre on October 28 over the Southwestern Caribbean Sea. It gradually organized into Tropical Depression Eighteen by 12:00 UTC the next day. The depression initially struggled to organize due to moderate wind shear. However, wind shear decreased on October 30, and the depression strengthened into Tropical Storm Philippe at around 06:00 UTC that day. Philippe began to strengthen as conditions quickly became more favorable. An Air Force Hurricane Hunter aircraft investigated the system late on October 30, and found that an open eyewall had developed, which was an indication that strengthening was likely imminent. Philippe began to strengthen more quickly on October 31, becoming a hurricane at 12:00 UTC that day after a reconnaissance aircraft observed hurricane-force winds from the SFMR instrument.