The record heat over southern Asia in May has helped heat up the Arabian Sea to 2°C above normal. The exceptionally warm SSTs have helped fuel a rare major hurricane in the Arabian Sea today, as Tropical Cyclone Phet underwent an impressive bout of rapid intensification this morning to become a Category 4 storm with 145 mph winds. Phet is a Thai word pronounced as Pet, meaning "Diamond". Intense hurricanes are rare in the Arabian Sea, due to the basin's small size, the interference of the summer monsoon, and the frequent presence of dry air and dust from the Arabian Peninsula. Phet is now the second strongest tropical cyclone ever recorded in the Arabian Sea, behind Category 5 Cyclone Gonu of 2007, which devastated Oman. Third place is held by the 2001 India Cyclone 01A and Very Severe Cyclonic Storm ARB 01 (02A), which were Category 3 storms with 125 mph winds.
Phet is over some of the warmest ocean waters on the planet, 30 - 31°C (86 - 88°F), and warm waters in excess of 26.5°C (80°F) extend to a depth of at least 50 meters (165 feet), resulting in a Tropical Cyclone Heat Potential high enough to allow Phet to attain Category 5 status. Phet is under moderate wind shear of 10 - 20 knots. The Joint Typhoon Warning Center (JTWC) is forecasting Phet to become a Category 5 storm later today. The storm is moving slowly north-northwest towards Oman, and could ingest dry air from the Arabian Peninsula on Thursday, resulting in weakening. It now appears likely that Phet will make landfall in Oman before recurving to the northeast and hitting Pakistan. The region of Oman likely to get hit is sparsely populated, so wind and storm surge damage will not be the main concerns. Phet will spread heavy rains over the heavily populated northern regions of Oman, which will likely cause extreme flooding. Phet has the potential to be worse for Oman than Tropical Cyclone Gonu, which did $4.2 billion in damage and killed 50 people in June 2007.
