The remnants of Hurricane Isaias have been folded into a low pressure system that will bring gales, heavy rain and unseasonable warmth to different parts of the UK this week.
Its centre, and with it the worst of the weather, will stay hundreds of miles offshore. North-west Scotland gets a spell of gales.
A Met Office yellow warning for wind covers parts of the Highlands and the Western Isles, with the risk of gusts touching 70mph, or 113km/h, in places. It is valid on Wednesday from 10:00 until 19:00 BST.
The warning describes a high risk of moderate impacts: disruption to rail, air and ferry transport, delays on roads and bridges, especially for high-sided vehicles, and possible short-term power cuts.
Widespread gusts of 50 to 60mph are likely, with 70mph possible on exposed coasts and hills around the middle of the day. Shetland is also expected to see 50mph gusts, with less risk of disruption, and 40mph gusts are possible in other parts of Scotland, Northern Ireland, northern England and north-west Wales.
Heavy rain will reach many parts of Scotland and Northern Ireland by the end of the day, heaviest in the north and west. Patchy rain may spread into north-west England and north Wales. Most of England and Wales will stay fine, with sunny spells once any early mist has cleared.
Isaias was the season's first Atlantic hurricane and came ashore in the southern United States last Friday. It weakened quickly and stopped being a hurricane, though its remnants went on to throw heavy rain across the eastern side of North America.
Those leftovers then drifted out over the Atlantic and were picked up by a powerful jet stream, which built them into a new area of low pressure. Meteorologists call what followed explosive cyclogenesis; the less formal term is a weather bomb.
The same jet stream is steering that storm's centre hundreds of miles clear of Britain, on a track close to Iceland, where it brings the threat of blizzards. Gusts over the sea between Iceland and the Faroe Islands could exceed 110mph. Nothing approaching that is expected anywhere near the UK.
What reaches Britain instead is the storm's warm south-westerly flow. Temperatures climb widely into the mid to high teens Celsius and may peak at 20C in a few locations in southern England, which leaves most places 2 to 4C above the mid-October average.
The warmth lingers into Thursday across much of England and Wales, with temperatures expected to peak at 22C in East Anglia. Afternoon highs of 11 to 16C would be typical for the middle of October.
A weather front then moves slowly southwards, taking rain across Scotland, Northern Ireland, northern England and north Wales, with cooler and eventually drier conditions spreading south through Friday and the weekend. Temperatures fall back towards the seasonal norm, with brisk winds and the chance of overnight frost in places. Computer models suggest high pressure will then settle close to the UK.
The forecast is internally consistent and the attribution is not in doubt, which is where it becomes interesting. One system is responsible for all of it: the blizzard risk near Iceland, the cancelled ferries in the Western Isles, and the 22C afternoon in East Anglia.
On the reasoning that credits Isaias with the gales, Isaias must also be credited with the sunshine. The first Atlantic hurricane of the season will be remembered in Norfolk as a pleasant Thursday.
This newspaper notes that the Met Office has no warning colour for this. Warnings are issued for impacts, and a temperature 2 to 4C above average plainly has impacts, chiefly on outdoor seating.
The geography of the system finishes the argument. Its most violent winds, above 110mph, are over open water between Iceland and the Faroes, where there is nobody to warn. Its mildest effect, a warm breeze from the south-west, covers the most densely populated part of the country, where there is nothing to warn about.
The Department of Unnecessary Research has settled on the only sound description of the week. A weather bomb has gone off several hundred miles away, and the part of it that reached Britain is the warm air. The forecast advises sunglasses.