Graphic: National Hurricane Center.
Updated 29 September: There is no change to the original forecast, and Hurricane Lorenzo still represents no threat whatsoever to the Canaries, being responsible only for increasing temperatures, a bit of calima, and some dirty rain possibly in some parts. But this update is to post this amazing and historic satellite image … the first time a Category 5 Hurricane, which is what Lorenzo has now become, has ever been so close to the Canaries and indeed to the European continent since records began in 1851. Lorenzo meanwhile continues its passage north towards the Azores.
Original post 27 September: You might hear some talk over coming days about Hurricane Lorenzo which has recently formed near the Cape Verde islands and is heading north. It is not, however, heading near us, but often hurricanes that don’t go directly west generate a lot of hot air … not least in social media as well as in the atmosphere! And that is pretty much the only effect Lorenzo is likely to have on us, with Aemet saying emphatically that the hurricane is not going to approach the Canaries but bypass us to the west as it heads to the Azores where it is expected on Tuesday. Thereafter, assuming it doesn’t after all turn west, it could go east to Spain, or north to southern Ireland, dissipating all the while.
Lorenzo’s erratic trajectory will cause hot air to be sucked out of the Sahara, however, because as the hurricane dislodges the Atlantic depression and turns it eastward, the trade winds are interrupted allowing the entry of desert air. As the storm strengthens this phenomenon increases: it is already a Category 4 hurricane with a speed of growth described as meteoric. Lorenzo’s proximity, therefore, and the resulting displacement of the Atlantic depression, is why we can expect increasingly warm weather over coming days, with something of an Indian Summer over the weekend and next week.