The term "tropical" refers to both the geographic origin of these systems, which form almost exclusively in tropical regions of the globe, as well as to their formation in maritime tropical air masses. The term "cyclone" refers to such storms' cyclonic nature, with anticlockwise rotation in the Northern Hemisphere and clockwise rotation in the Southern Hemisphere. Depending on its location and intensity, a tropical cyclone may be referred to by names such as "hurricane", "typhoon", "tropical storm", "cyclonic storm", "tropical depression" or simply "cyclone".
The precursor to Ida caused catastrophic and deadly flash flooding in Venezuela. Ida knocked down palm trees and destroyed many homes in Cuba during its brief passage over the country. Throughout its path of destruction in Louisiana, more than a million people in total had no electrical power. Widespread heavy infrastructural damage occurred throughout the southeastern portion of the state, as well as extremely heavy flooding in coastal areas. New Orleans' levees survived (unlike during Katrina), though power line damage was extensive throughout the whole city. There was also substantial plant destruction in the state. Numerous tornadoes were spawned by Ida as it moved over the Eastern United States. The remnants of the storm produced unexpectedly severe damage in the Northeastern United States on September 1–2. Several intense tornadoes and catastrophic flash flooding swept through the entire region, which had already been impacted by several tropical cyclones, Elsa, Fred, and Henri during July and August. The flooding in New York City prompted the shutdown of much of the transportation system. (Full article...)
The 1969 Atlantic hurricane season was the most active Atlantic hurricane season since the 1933 season, and was the final year of the most recent positive ("high-quality") Atlantic multidecadal oscillation (AMO) era. The hurricane season officially began on June 1, and lasted until November 30. The season had the highest number of systems reach hurricane status – twelve – in a single season, until that record was surpassed in 2005. The season was above-average despite an El Niño, which typically suppresses activity in the Atlantic Ocean, while increasing tropical cyclone activity in the Pacific Ocean. Activity began with a tropical depression that caused extensive flooding in Cuba and Jamaica in early June. On July 25, Tropical Storm Anna developed, the first named storm of the season. Later in the season, Tropical Depression Twenty-Nine caused severe local flooding in the Florida Panhandle and southwestern Georgia in September.
2014 - Typhoon Phanfone(pictured) peaked as a Category 4 super typhoon, with 1-minute sustained winds of 255 km/h (155 mph), a few days before re-curving to Japan, and caused a total of $100 million in damage and killed 11 people.
Image 6The dangerous semicircle is the upper-right corner, with the arrow marking the direction of motion of a Northern Hemisphere storm. Note that typhoons, etc. are asymmetrical, and semicircle is a convenient misnomer. (from Effects of tropical cyclones)
Image 26The initial extratropical low-pressure area forms at the location of the red dot on the image. It is usually perpendicular (at a right angle to) the leaf-like cloud formation seen on satellite during the early stage of cyclogenesis. The location of the axis of the upper level jet stream is in light blue. (from Cyclone)
Image 27Tropical cyclones form when the energy released by the condensation of moisture in rising air causes a positive feedback loop over warm ocean waters. (from Cyclone)
Image 29A fictitious synoptic chart of an extratropical cyclone affecting the UK and Ireland. The blue arrows between isobars indicate the direction of the wind, while the "L" symbol denotes the centre of the "low". Note the occluded, cold and warm frontal boundaries. (from Cyclone)
Image 30An extratropical cyclone near Iceland on September 4, 2003 (from Cyclone)
There is a plethora of factors that influence tropical cyclogenesis, the formation of tropical cyclones, in the Northeastern Pacific. The North Pacific High and Aleutian Low, which occur from December to April, produce strong upper-level winds which prevents the formation of tropical cyclones. During the summer and early autumn months, sea surface temperatures are generally warm enough to support tropical cyclone development in the Northeast Pacific, and perhaps even rapid intensification. Additionally, El Niño events cause more powerful hurricanes to form by generating weaker wind shear and higher sea surface temperatures, while La Niña events reduce the number of such hurricanes by doing the opposite. (Full article...)