Tropical Cyclones Portal
A tropical cyclone is a storm system characterized by a large low-pressure center and numerous thunderstorms that produce strong winds and heavy rainfall. Tropical cyclones feed on the heat released when moist air rises, resulting in condensation of water vapor contained in the moist air. They are fuelled by a different heat mechanism than other cyclonic windstorms such as nor'easters, European windstorms, and polar lows, leading to their classification as 'warm core' storm systems. Tropical cyclones originate in the doldrums near the Equator, approximately 10 degrees away.
The term 'tropical' refers to both the geographic origin of these systems, which form almost exclusively in tropical regions of the globe, and 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 can be referred to by names such as 'hurricane', 'typhoon', 'tropical storm', 'cyclonic storm', 'tropical depression', or simply 'cyclone'.
- Pictured: Typhoon Tip
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Typhoon Tip was the largest and most intense tropical cyclone on record. The nineteenth tropical storm, twelfth typhoon, and third super typhoon of the 1979 Pacific typhoon season, Tip developed out of a disturbance in the monsoon trough on October 4 near Pohnpei. Initially, a tropical storm to its northwest hindered the development and motion of Tip, though after it tracked further north Tip was able to intensify. After passing Guam, it rapidly intensified and reached peak winds of 305 km/h (190 mph) and a worldwide record low pressure of 870 mbar (hPa) on October 12. At its peak strength, it was also the largest tropical cyclone on record with a diameter of 2220 km (1380 mi). It slowly weakened as it continued west-northwestward, and later turned to the northeast under the influence of an approaching trough. Tip made landfall on southern Japan on October 19, and became an extratropical cyclone shortly thereafter.
Air Force Reconnaissance flew into the typhoon for 60 missions, making Tip one of the most closely observed tropical cyclones of all time. Rainfall from the typhoon breached a flood-retaining wall at a United States Marine Corps training camp in the Kanagawa Prefecture of Japan, leading to a fire which injured 68 and killed 13 marines. Elsewhere in the country, it led to widespread flooding and 42 deaths. 44 were killed or left unaccounted for due to shipwrecks offshore.
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Rainfall total map of Tropical Storm Allison in June 2001. The rainfall caused severe flooding along its path, particularly near Dallas, Texas, resulting in over $6 billion in damage. Map provided by David Roth, Hydrometeorological Prediction Center.
Currently active tropical cyclones
Tropical cyclone anniversaries
- May 29, 1958 - Typhoon Phyllis reached its peak intensity with 295 km/h (185 mph) winds, becoming the strongest typhoon ever recorded in the month of May.
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West Hawaii Today
West Hawaii Today
Tue, 26 May 2015 14:11:15 -0700
Projected climate conditions point to an above-normal hurricane season for the basin, an area located north of the equator spanning from 140 degrees west longitude to the International Date Line. Forecasters are calling for five to eight tropical ...
PreventionWeb (press release)
Thu, 21 May 2015 20:56:15 -0700
Through real-life visual images from typhoons in recent years, including Morakot, Utor and Haiyan, the video introduces four major threats caused by tropical cyclones, namely strong winds, rainstorms, huge waves and storm surges. As the typhoon season ...
Baltimore Sun (blog)
Baltimore Sun (blog)
Wed, 13 May 2015 11:44:31 -0700
Warm water and moist air are key fuel for tropical cyclones to form and strengthen. Because of that, AccuWeather predicts a normal amount of storms will make landfall in the U.S. On average, two or three storms hit U.S. coastline each year. Forecasters ...
Hawaii News Now
Fri, 22 May 2015 14:33:45 -0700
Make sure to download the Hawaii News Now Weather APP to track these potential tropical cyclones. The weather team will be watching it throughout the evening and weekend. Also, the Central Pacific Hurricane Center will come out with a prediction on May ...
Wed, 13 May 2015 02:22:30 -0700
Furthermore, the English pronunciation of Sonamu is similar to "tsunami" and Vicente appears in both the name lists for tropical cyclones in the western North Pacific and the eastern North Pacific, these two names have also been replaced to avoid ...
Thu, 30 Apr 2015 23:22:30 -0700
The state weather bureau sees one to two tropical cyclones for the month of May despite the prevailing dry season. Chris Perez, weather forecaster of the Philippine Atmospheric Geophysical and Astronomical Services Administration (Pagasa), said on ...
Wed, 27 May 2015 04:26:15 -0700
Last year, forecasters predicted four to seven tropical cyclones — the term that encompasses tropical depressions, tropical storms and hurricanes. Three tropical cyclones developed into hurricanes Julio, Iselle and Ana and threatened the islands from ...
Tue, 26 May 2015 08:33:45 -0700
Warmer ocean temperatures appear to have fueled an increase in the power of hurricanes, but led to a decrease in the overall number of tropical cyclones worldwide, according to a new study by Florida State researchers. In a recent study published on ...
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