The weather pattern across the North Atlantic is undergoing a remarkable transformation this week, with an intense area of low pressure near Iceland followed rapidly by strong high pressure across the UK.
This atmospheric “pressure ping-pong” will bring strong winds to north-western Scotland before conditions become quieter and cooler towards the weekend. While high pressure is expected to settle the weather for many, its precise position will determine whether some areas see sunshine or remain cloudy and showery.
An unusually deep Atlantic low
A powerful low-pressure system is rapidly developing as it moves northwards across the Atlantic and interacts with the jet stream. Its central pressure is forecast to fall to around 937 hPa as it approaches Iceland, making it an exceptionally intense system for October.
For comparison, the lowest October pressure recorded in Iceland is 938 hPa. However, the centre of the developing system is expected to remain a little to the south of Iceland when it is at its deepest. Whether a record is observed will therefore depend upon its exact track.
The system is undergoing explosive cyclogenesis, a term used when the central pressure of a low falls by at least 24 hPa in 24 hours. In this case, the pressure is forecast to drop by around 30 hPa as the low crosses the jet stream and rapidly intensifies.
The strongest winds will be found to the south and southwest of the low’s centre, where the isobars are packed most tightly. Across Iceland itself, heavy snow could prove more disruptive than the wind. Moist air wrapping around the system is expected to meet colder air across northern Iceland, producing the potential for heavy snowfall and blizzard conditions.
READ MORE: October weather extremes: from late warmth to early winter
Strong winds for north-western Scotland
Although the centre of the low will remain well away from the UK, its associated weather fronts will influence conditions here.
A yellow warning for wind is in force across north-western Scotland from 10am until 7pm on Wednesday. Gusts of 50 to 60 mph are expected, with the possibility of speeds approaching 70 mph around the most exposed parts of the Outer Hebrides. The strongest gusts are generally expected to remain offshore, but only a small change in the low’s development or track could alter the area affected.
These wind speeds are not exceptional for north-western Scotland during autumn. However, this is one of the first particularly windy spells of the season and many trees remain in leaf, increasing their resistance to the wind. This creates a greater risk of falling branches and may lead to travel disruption, particularly for high-sided vehicles and on exposed bridges.
⚠️ Yellow weather warning issued ⚠️ Strong winds across northwest Scotland Wednesday 1000 – 1900 Latest info 👉 https://t.co/TfU9Ok8qZD Stay #WeatherAware⚠️ https://t.co/ciSTsKROmL
— Met Office (@metoffice) October 13, 2026
Elsewhere, Wednesday will bring plenty of fine weather, although rain will move into north-western Scotland. Winds will strengthen across other northern and western areas, while light winds and clear skies could allow patches of mist and fog to form farther south early in the day.
Temperatures will remain unusually mild, with values widely reaching the mid to high teens.
A rapid rise in pressure
The deep Atlantic low will soon be replaced by a very different pressure pattern. By Saturday, high pressure is expected to dominate the UK, with central pressure potentially reaching between 1036 and 1040 hPa.
This represents a change of around 100 hPa between the intense low near Iceland and the strong high developing over the UK in the space of approximately three days.
Some forecast models take the high close to the October pressure records for England, Wales and Northern Ireland, which are around 1041 to 1042 hPa. Other models produce a slightly weaker high, closer to 1036 or 1037 hPa. Although a record is unlikely, the strength of the high remains notable for the time of year.
READ MORE: Are the UK’s seasons changing?
Turning cooler towards the weekend
A cold front will move slowly southwards during Thursday, bringing some rain and introducing cooler air from the north.
Southern areas will initially remain in the milder air and could still reach the high teens, or possibly 20°C if sufficient sunshine develops. Behind the front, temperatures will fall more noticeably. By Friday and the weekend, daytime values will generally be in the low to mid-teens.
This will feel considerably cooler than the recent mild conditions, although temperatures will mostly be close to, or only slightly below, the seasonal average.
Confidence is high that pressure will build across the UK by Saturday. All 50 members of the European model ensemble show high pressure close to or over the country, providing a strong signal for widely settled conditions.
However, high pressure does not guarantee blue skies everywhere. If its centre lies farther north or west, winds could arrive from the North Sea, bringing cloud, a chilly breeze and occasional showers to eastern areas. If the high sits closer to the Irish Sea, conditions would be more widely dry, with better prospects for sunshine.
High pressure is likely to remain influential into the following week, although subtle changes in its position will continue to determine where the brightest, coolest or showery weather develops. After the Atlantic turbulence, a quieter but distinctly more autumnal spell is on the way.
https://www.youtube.com/watch/mKEVJia9IeM?start=0Keep up to date with weather warnings, and you can find the latest forecast on our website, on YouTube, by following us on X and Facebook, as well as on our mobile app which is available for iPhone from the App store and for Android from the Google Play store.
