xtd 10... yeah, by continuity that would be the weak trough over the bahamas. the mid-level low/convective complex north of puerto rico isn't really in sync with it.. though its origins are quite likely the mlc that sheared off td 10 as it was approaching the islands and opening up. twd is mindful of the mid-level low/surface trough associated with the feature near the yucatan. that'll be moving into the boc tomorrow.. general motion towards the mouth of the rio grande should continue, getting it there around tuesday. it's a watcher at least. by far the most impressive system in the basin is the 20w wave/low. large waves like that in late august tend to develop. no invest yet but that should be forthcoming. among the three features out there today... two have only modest chances of development.. the east atlantic wave has a much greater chance, but in the long range models unanimously recurve it (climo supports this, but there is a recurvature bias with the globals in these cases). the north atlantic is atypically threat free for august 20th. HF 0038z21august
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