I would use tropical zone or tropics; I have never heard tropical strip , but it obviously has a respectable usage in the meteorological field: Tropical Strip Surface Charts are historical charts archived at the National Climatic Data Center (NCDC). These analyzed charts are prepared by the National Weather Service, and archived on 35-mm microfilm by the NCDC. The charts are on one reel of microfilm for 1969, two reels per year (January - June, July - December) 1970 through 1978, and 4 reels per year from January 1979 through 1984, 6 reels per year from January 1985 through 1992.
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Tropical Strip Surface Charts are historical charts archived at the
National Climatic Data Center (NCDC). These analyzed charts are
prepared by the National Weather Service, and archived on 35