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This weekend’s weather offers a mix of autumnal cloud, sunshine, and chilly nights.

Saturday will begin on a cloudy note for much of the country, with the most persistent cloud and outbreaks of rain or drizzle affecting northern and north-western parts of Scotland. Breezy conditions will accompany the rain here, making for a rather damp and unsettled start. Across southern areas

quantities not routinely measured but important for model process understanding. Areas of key interest Measure updrafts, turbulence and dynamical structures in convective clouds on fine scales. Understand effect of pre-convective environment on subsequent storm development. Interaction between

fraction 12. surface (skin) temperature Un-split File 2 [yyyymmddhhmm_u1096_ng_umqv_Wholesale2.grib] Full domain, all available time steps and the following surface level parameters: 1. low cloud amount 2. medium cloud amount 3. high cloud amount 4. convective cloud base height 5. convective cloud top

to the seasonal average. We've got a change in type this week with high pressure dominating ⛅ Here's the latest on the week ahead 👇 pic.twitter.com/LIKwKshdrT — Met Office (@metoffice) September 21, 2025 As we move into Wednesday night, clear spells will persist for many, with some residual cloud lingering

Areas of expertise Model Evaluation Seamless modelling approach Understanding cloud processes Process-orientated metrics of model performance Publications by Keith Williams Current activities Keith heads the Atmospheric Processes and Parametrizations group. The group is responsible

The representation of solar and infra-red radiation, and its interaction with clouds in our numerical models.

Various radiative processes occur in the atmosphere: gases, aerosols, cloud droplets and ice crystals absorb radiation and emit thermal radiation. Aerosols, cloud particles and air molecules scatter radiation. The surface absorbs, reflects and emits radiation. The radiative properties

for Wednesday 18 Feb 2026 2026-02-18 Weather: A very cold, dry and largely cloudy day with a few bright or sunny spells breaking through. Strong winds reaching gale of severe gale on higher summits giving severe wind chill. Chance of cloud-free hill tops above 800m: 80%. Low Cloud and visibility: Some

% Forecast for Wednesday 18 Feb 2026 2026-02-18 Weather: A very cold, largely dry and cloudy day with a few bright spells breaking through. The odd light snow shower possible but will be short lived. Strong winds reaching gale force on higher summits giving severe wind chill. Chance of cloud-free hill

2026-02-18 Weather: A very cold, largely dry and cloudy day with a few bright or sunny spells breaking through. Some very light outbreaks of rain possible over Skye in the afternoon. Strong winds reaching gale of severe gale on higher summits giving severe wind chill. Chance of cloud-free hill tops

on the 2nd, but showers became more frequent in the north-east from early afternoon. Cloud, mist and fog with light rain spread across the south and parts of the Midlands on the 3rd, with sunshine and showers in the north, the showers turning thundery over the Pennines at times. High pressure then built