Just do it.
It is often not possible to get an immediate clearance from Dakar. (They hardly qualify as Air Traffic "CONTROL" in any event. Same applies to most African airspace, in truth).
Best to announce one's manoeuvres on 121.5 and 123.45, preceded by PAN, and just take avoiding action from CB's or severe turbulence. Radio plus the use of TCAS allows one to stay clear of dangerous weather, with far less risk to all than that provided by severe wx in the ITCZ.
Last edited by RoyHudd; 2nd Dec 2009 at 15:40.