Satellite signatures of rapid cyclogenesis

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Author
Atangan, Jose F. H.
Date
1988Advisor
Wash, Carlyle H.
Second Reader
Nuss, Wendell A.
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Show full item recordAbstract
Animation of satellite visual and infrared imagery indicates that rapid cloud growth
is a characteristic of explosively deepening cyclones. The working hypothesis in this
thesis is that the intense vertical motions responsible for the low-level spin-up will
produce rapid cloud expansion in the upper troposphere that can be detected using digital
satellite data. Using digital IR data from GOES-West, the cloud growth of three
explosive storms that developed over the eastern North Pacific Ocean were measured
quantitatively and compared with the cyclone deepening rate. The results indicate that
the growth in areal coverage of clouds colder than -45' C is most closely related to the
explosive development period while the growth of the warmer cloud tops is related to the
open wave stage. This relationship is dependent on the cloud pattern of the maturing
cyclone. Correlations between cloud growth and pressure deepening were calculated but
provide only a general estimate of the relationship between the two parameters. This
study demonstrates the feasibility of using digitized satellite data to quantitatively analyze
the cloud growth and structure of explosively developing cyclones.
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