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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

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

, it will be a largely dry day with variable cloud and sunny intervals. The best of the sunshine will be across southern, central and eastern England, where it will feel very warm, with temperatures reaching 27–28°C in places. It will be warm across much of the country, away from the northwest

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

Tuesday will bring a continuation of changeable conditions across western parts of the UK, with cloud and outbreaks of rain or drizzle moving eastwards through the morning. The heaviest rainfall is expected over west-facing high ground, particularly across Wales, northern England, and southwest

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

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 boundary layer structures

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, particularly between day and night. The boundary layer depth is simply the current thickness of this layer. Fraction of horizontal grid square occupied by cloud below 1000 feet above sea level. Time steps J kg-1 0.1 [None] Hourly (1h-126h) J kg-1 0.1 [None] Hourly (1h-126h) J kg-1 0.1 [None] Hourly (1h

Tuesday will begin largely dry and bright across northwestern areas, with settled conditions prevailing. A band of cloud and scattered showers will stretch from the southwest approaches through Wales to southeastern Scotland and northeastern England. This band is expected to fragment through