Beyond Belief
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A tropical wave a few hundred miles north of Puerto Rico is moving into a region where an upper-level low pressure system is spinning. The two weather systems are producing plenty of clouds and thunderstorms over a wide region of ocean. Wind shear is about 20 knots over the area, so not much development today is expected. However, wind shear is expected to drop to about 15 knots Sunday in the area, which could allow some slow development. Water vapor satellite loops show that the tropical wave has brought copious moisture into the previously dry upper level low, and this low could gradually develop a surface low pressure area as thunderstorm activity continues to moisten the region. This system is currently stationary, but is expected to drift northwards over the next two days. A Hurricane Hunter aircraft is scheduled to investigate the area Sunday afternoon.
http://www.wunderground.com/blog/JeffMasters/comment.html?entrynum=723&tstamp=200707
http://www.wunderground.com/blog/JeffMasters/comment.html?entrynum=723&tstamp=200707