page_title: Tropical cyclone rainfall forecasting
section_title: Tools used in preparation of forecast
hierarchical_section_title: Tropical cyclone rainfall forecasting / Tools used in preparation of forecast
caption_attribution_description: English: Joint Hurricane Testbed www.ofcm.gov/ihc04/presentations/e_session3/06_marchok_ihc58_final.ppt
context_page_description: Tropical cyclone rainfall forecasting involves using scientific models and other tools to predict the precipitation expected in tropical cyclones such as hurricanes and typhoons. Knowledge of tropical cyclone rainfall climatology is helpful in the determination of a tropical cyclone rainfall forecast. More rainfall falls in advance of the center of the cyclone than in its wake. The heaviest rainfall falls within its central dense overcast and eyewall. Slow moving tropical cyclones, like Hurricane Danny and Hurricane Wilma, can lead to the highest rainfall amounts due to prolonged heavy rains over a specific location. However, vertical wind shear leads to decreased rainfall amounts, as rainfall is favored downshear and slightly left of the center and the upshear side is left devoid of rainfall. The presence of hills or mountains near the coast, as is the case across much of Mexico, Haiti, the Dominican Republic, much of Central America, Madagascar, Réunion, China, and Japan act to magnify amounts on their windward side due to forced ascent causing heavy rainfall in the mountains.
caption: r-CLIPER for Isabel (2003)
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