Typhoon Nida (2009)
Typhoon Nida known in the Philippines as Super Typhoon Vinta was an extremely powerful tropical cyclone that became the most intense tropical cyclone in the Western Pacific Basin in the 2000s tied with Jangmi as well as the most intense typhoon in the basin since Paka of 1997 and the most intense tropical cyclone worldwide of 2009.Meteorological history
Early on November 21 the Joint Typhoon Warning Center reported that an area of convection had persisted within a monsoon trough about to the southeast of Guam island. At this time the system was moving around the subtropical ridge of pressure, with an anticyclone over the cyclone helping the convection to consolidate over a broad and elongated low level circulation center which was located in an area of minimal vertical wind shear. Later that morning a Tropical Cyclone Formation Alert was released as deep convection increased in organization with multiple bands of convection starting to wrap into the developing low level circulation center. The system was then declared as a tropical depression by the JMA later that day before the JTWC followed suit early the next day, who assigned the designation of 26W to the depression. During November 22, the depression remained weak, before during the next day both the JMA and the JTWC upgraded the depression to a tropical storm, with the JMA assigning the international number of 0922 and name of Nida as it started to move along a subtropical ridge. Later on November 23, microwave imagery showed that an eye had developed within a well defined low level circulation center. Early the next day, the JTWC reported that Nida had intensified into a category 1 typhoon as the eye became well defined with deep convection wrapping around most of the eye. However, despite the JTWC reporting 1-minute sustained wind speeds of, the JMA only reported 10-minute sustained wind speeds of which made Nida a Severe Tropical Storm. Early on November 25 the JMA reported that Nida had intensified into a typhoon before reporting later that day that the typhoon had rapidly intensified under favourable conditions and reached its peak 10-minute wind speeds of, with a peak pressure of 905 hPa. During the next day the JTWC also reported that Typhoon Nida had rapidly intensified over the previous 18 hours into a category five super typhoon with winds of, as it maintained a well defined symmetrical structure. The JTWC then reported that Nida had intensified a little bit more and reached its peak 1-minute sustained wind speeds of. The typhoon later weakened to a category four, before re-strengthening to a category five on November 27, remaining quasi-stationary for more than two days. It weakened to a tropical depression on December 2 due to stronger vertical wind shear associated by the Northeast monsoon, and the storm dissipated on December 4.Preparations and Impact
Early on November 24, the National Weather Service Weather Forecast Office in Tiyan, Guam placed the island of Faraulep under a tropical storm warning, before later that morning issuing tropical storm watches for Fais and Ulithi. As Nida was upgraded to a typhoon by the JTWC, the NWS upgraded the tropical storm warning for Faraulep to a typhoon warning. Later that day they reported that the typhoon warning for Faraulep had been cancelled as Nida was moving to the northwest away from Faraulep before early the next day the tropical storm warning for Fais and Ulithi were cancelled. As the storm entered the Philippine Area of Responsibility, PAGASA issued a warning to the shipping industry, warning of strong to gale force winds. The typhoon was the most intense tropical cyclone of 2009.