mardi 29 septembre 2009

prévoir le Meltem

  • Due to the katabatic nature of the meltemi one can experience strong fall winds on the leeward side of the islands, notorious are Kea (we did survive though), Evvia, Tinos and Andros, Folegandros, Kos, Serifos, Amorgos and Sifnos. An orographic cloud to leeward of the mountain spells danger.
  • When the wind encounters very high cliffs on the North shore of an island, a calm - extending several miles off shore - can be expected. Good examples are Amorgos, Paros and Naxos.
  • In the wide corridor between de dodecanese and cycladic islands the Meltemi blows undisturbed over 100 miles. Within six hours of a 30-knot wind, the waves can reach heights over three meters. The adverse currents make these waves steeper, which can be seriously dangerous for yachts smaller than 10 meter.
  • The Ionian Sea in the west of Greece is not affected by these Etesian winds but experiences a reliable Maistro wind throughout the sailing season. For an explanation on the Maistro wind please visit my page on Sailing routes in the Ionian.
  • Expect funnelling winds, which can make certain straits dangerous to pass because of currents and higher wind velocities. Classical areas are: between Andros and Evvia (currents up to 5 knots!); between Ikaria and Samos till the Fournoi-archipelago; Between Paros and Naxos; North side of Amorgos; West side of Karpathos. Sometimes South of both Kea and Kythnos.
  • Tell-tales for your own Meltemi 24-36 hour prediction:
    • Higher predicted atmospheric pressure over the Balkan/Northern Aegean.
    • A sudden drop in humidity (first morning without dew on deck).
    • Scattered little altocumulus clouds one day in advance.
    • A clear improvement of visibility combined with a raise in atmospheric pressure (4 hPa within 12 hours).
Fortunately, the possibility of stronger winds is actually the only shortcoming of the Aegean. There are hardly any shallow waters, no tides to speak off and no fog (good visibility!): all the ingredients for perfect yacht charter vacations.