Typhoon Nida (2009)

Typhoon Nida (Vinta)

Typhoon (JMA scale)
Category 5 (Saffir–Simpson scale)
Typhoon Nida before peak intensity on November 25, 2009
Formed	November 21, 2009
Dissipated	December 3, 2009
Highest winds	10-minute sustained: 215 km/h (130 mph) 1-minute sustained: 285 km/h (180 mph)
Lowest pressure	905 mbar (hPa); 26.72 inHg
Fatalities	None
Damage	None
Areas affected	Micronesia, Guam
Part of the 2009 Pacific typhoon season

Typhoon Nida, known in the Philippines as Typhoon Vinta, was the most intense tropical cyclone in the Northwest Pacific Ocean during the 2000s, tied with Jangmi in 2008.^[1]

Meteorological history

Map plotting the track and intensity of the storm according to the Saffir–Simpson hurricane wind scale

Early on November 21 the Joint Typhoon Warning Center (JTWC) reported that an area of convection had persisted within a monsoon trough about 880 km, (545 mi) to the southeast of Guam.^[2][3] 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.^[2][3] 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.^[4][5] 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.^[6][7][8]

Typhoon Nida as it was going through an eyewall replacement cycle

Later on November 23, microwave imagery showed that an eye had developed within a well defined low level circulation center.^[9] 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.^[10][11] However despite the JTWC reporting 1-minute sustained wind speeds of 160 km/h, (100 mph), the JMA only reported 10-minute sustained wind speeds of 110 km/h, (70 mph) which made Nida a Severe Tropical Storm.^[12][13] 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 195 km/h (120 mph), with a peak pressure of 905 hPa.^[14][15] 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 285 km/h (180 mph), 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 290 km/h (185 mph).^[12]

Global infrared satellite imagery of Super Typhoon Nida at maximum size while becoming a category five for the second time, with 1-minute sustained winds of 145 knots (269 km/h; 167 mph).

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.^[12]

Preparations and impact

Micronesia

Early on November 24, the National Weather Service Weather Forecast Office in Tiyan, Guam (NWS Guam) placed the island of Faraulep, before later that morning issuing tropical storm watches for Fais and Ulithi.^[16][17] As Nida was upgraded to a typhoon by the JTWC, the NWS upgraded the tropical storm warning for Faraulep to a typhoon warning.^[18] 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.^[19]

Records

Typhoon Nida was operationally estimated to have had a minimum pressure of 905 hPa, (26.72 inHg), by the Japan Meteorological Agency.^[20] Nida was the most intense tropical cyclone during 2009, surpassing Hurricane Rick by 1 hPa.^[21][22][23]

See also

• Typhoon Mitag (2002)
• Typhoon Jangmi (2008)

References

External links

Wikimedia Commons has media related to Typhoon Nida (2009).

• RSMC Tokyo - Typhoon Center
  • Best Track Data of Typhoon Nida (0922) (Japanese)
  • Best Track Data (Graphics) of Typhoon Nida (0922)
  • Best Track Data (Text)
• JTWC Best Track Data of Super Typhoon 26W (Nida)
• 26W.NIDA from the U.S. Naval Research Laboratory
• General information of Typhoon Nida (0922) from Digital Typhoon

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