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Terms to Know:
Is a low pressure trough or a weak low pressure circulation
This is a general term used to describe anti-clockwise circulations originating over tropical waves.
An area of organised convection in the lower atmosphere which may or may not be associated with a surface low pressure system and which has maintained its identity for at least 24 hours.
Is a tropical cyclone in which the maximum average surface win is 38 mph or less
A well organised tropical cyclone with maximum average surface win of 39-73 mph.