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Tropical Storm Marty was a weak tropical storm that developed in the 2009 Pacific hurricane season. It was the sixteenth depression and the thirteenth named storm of the 2009 Pacific hurricane season. It formed off from on September 16 from a large area of low pressure located 340 mi (545 km) south-southwest of Cabo San Lucas, Mexico.

Meteorological history
Tropical Storm Marty can be track back from an area of thunderstorm activity associated with a tropical wave that were off the south coast of Mexican state of Guerrero on September 11. A weak mid-level cyclonic circulation was also find near that wave. Clusters of scattered convection developed south of the circulation despite strong easterly wind shear. Then the National Hurricane Center (NHC) began to issue Tropical Weather Outlooks for that wave around 11 am EDT (1900 UTC on September 13). The wave was part of a large area of disorganized multilayered clouds which is basically tied into a large monsoonal circulation. It became better organized on the afternoon of September 14 with scattered convection occuring and also developing an 1008 milibar (29.77 inHg) surface low. The NHC updgraded it to a tropical depression, around 4 am PDT (1200 UTC on September 16) while the it was located about 340 mi (545 km) south-southwest of Cabo San Lucas, Mexico. As it was numbered, the circulation of Sixteen-E has finally began to seperate from the northeast end of the elongated monsoonal like circulation. It was named Marty six hours later as it became a tropical storm with winds of 40 mph (65 km/h) and a barometric pressure of 1003 mbar (hPa; 29.62 inHg). Despite becoming a tropical storm, the low level circulation center of Marty was located on the eastern edge of its deep convection, possibly due to the influence of a ridge of high pressure locating inland Mexico. Marty moved slowly, and did not became significantly better organized although associating with deep convective activity. It began to slowly weaken after reaching a peak intensity with maximum sustained winds of 45 mph (75 km/h) and a barometric pressure of 1001 mbar (hPa; 29.56 inHg).