Editing Tropical wave (section)

==Atlantic==
[[File:Tropical waves.jpg|thumb|center|700px|Tropical wave formation]]
Tropical waves in the Atlantic basin develop from low-pressure disturbances, which develop as far east as [[Sudan]] in east [[Africa]],<ref>{{cite web |publisher=Cooperative Institute for Meteorological Satellite Studies |access-date=2008-09-11 |title=Morphed Integrated Microwave Imagery at CIMSS (MIMIC) |url=http://cimss.ssec.wisc.edu/tropic/real-time/marti/2008_09L/webManager/mainpage.html |url-status=dead |archive-url=https://web.archive.org/web/20080911073853/http://cimss.ssec.wisc.edu/tropic/real-time/marti/2008_09L/webManager/mainpage.html |archive-date=2008-09-11 }}</ref> and drift across the continent into the [[Atlantic Ocean]]. These are generated or enhanced by the [[African Easterly Jet]]. The clockwise circulation of the large transoceanic [[High-pressure area|high-pressure cell]] or [[anticyclone]] centered near the [[Azores]] islands (known as the [[Azores High]]) impels easterly waves away from the coastal areas of Africa towards [[North America]].

Tropical waves are the origin of approximately 60% of Atlantic [[tropical cyclones]] and of approximately 85% of intense Atlantic hurricanes ([[Saffir-Simpson Hurricane Scale|Category 3]] and greater).<ref name = "AOML FAQ A4">{{cite web |author=[[Atlantic Oceanographic and Meteorological Laboratory]], Hurricane Research Division |title=Frequently Asked Questions: What is an easterly wave? |publisher=[[NOAA]] |access-date=2006-07-25 |url=http://www.aoml.noaa.gov/hrd/tcfaq/A4.html}}</ref><ref name="MWR Avila 1995">{{cite journal |last1=Avila, Lixion |author2=Richard Pasch  |date=March 1995 |title=Atlantic tropical systems of 1993 |journal=[[Monthly Weather Review]] |volume=123 |issue=3 |pages=887–896 |doi=10.1175/1520-0493(1995)123<0887:ATSO>2.0.CO;2 |first1=Lixion A. |bibcode=1995MWRv..123..887A|doi-access=free |author1-link=Lixion Avila }}</ref>

Tropical cyclones can sometimes degenerate back into a tropical wave. This normally occurs if upper-level [[wind shear]] is too strong. The storm can redevelop if the upper-level shear abates.

If a tropical wave is moving quickly, or is organized enough, it can have winds of a strength in excess of tropical storm force, but it is not considered a tropical storm unless it has a closed low-level circulation. An example of this was [[Hurricane Claudette (2003)|Hurricane Claudette]] in [[2003 Atlantic hurricane season|2003]], where the original wave had winds of {{convert|45|mi/h|km/h|0|abbr=on}} before developing a closed low-level circulation.