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Is Hurricane Leslie Coming Our Way? No Signs Yet ...
Blog by Nick Finnis
4th October 2018 18:41

Is Hurricane Leslie Coming Our Way? No Signs Yet ...

The Daily Express, in true fashion without much to back it up yesterday, proclaimed that: “TROPICAL storm Leslie is set to batter the UK with gale force winds and heavy downpours, with the powerful Atlantic cyclone expected to plunge the country into weeks of punishing early-winter weather.”

True there is a hurricane named Leslie way to the southwest in the western North Atlantic and it is forecast to drift eastwards over the Atlantic into early next week.

Leslie is the latest and 6th hurricane to be classified in the 2018 Atlantic season, 10 days after forming as a subtropical storm. Leslie hasn’t moved much over the past week, meandering over the central North Atlantic with a southward shift over warmer waters – which has allowed the storm to strengthen into a category one hurricane. A northward drift in its track towards the end of this week will take it over cooler waters, weakening the system.

Some recent model runs have shown the ex-tropical remnant low that Hurricane Leslie becomes eventually picked up by the jet stream as it veers northeast next week and loses its tropical characteristics, before tracking northeast across the North Atlantic, perhaps rapidly deepening into a deep depression. But not until later next week, which means model reliability of the track and depth of this low should be treated with low confidence for now.

The 00z operational run of the GFS model this morning accelerated Leslie as a deep post tropical storm northeast from near the Azores on Thursday towards Iceland by the weekend, whilst the 00z ECMWF prefers the jet stream not to pick it up and instead tracks Leslie east/southeast to the south of the Azores eventually by day 10. 06z GFS operational run tracks Leslie right over the Azores Friday next week, before tracking northeast across Ireland as a fairly innocuous looking low. The 12z GFS similar to the 00z ECM in tracking Leslie east or southeast to the south of the Azores, though it does spawn a few deep lows to move northeast close to western Britain next week.



Latest GFS operational run (12z) shows Leslie at the bottom of the chart not engaging with the jet stream and instead drifting east to the south of the Azores, however a few deep lows to develop in association with the jet and head toward the UK later next week.

So, as illustrated above, the model differences cast a fair bit of uncertainty on the eventual track of Leslie and post-tropical system it becomes. High pressure over the mid-North Atlantic blocking its progress east over the next few days at least. So premature to proclaim that Leslie will batter the UK. But next week does look to see increasingly unsettled, wet and windy weather spreading in across the northwest and far west, as an upper trough digs south over the North Atlantic to the west of the British Isles and the jet stream strengthens ahead of it over western Britain and Ireland – bringing with it the threat of one or two deepening depressions running northeast close to the west. However, they may not be remnants of Leslie.

The flip side of the wet and windy weather spreading in across the west is that ahead of it the models are indicating a deep southerly flow towards the end of the week – which could lift temperatures into the low 20s centigrade across eastern and southern England, which will be well above average for the time of year.

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