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Charlie specializes in modelling the dispersion of volcanic eruption clouds using the Met Office's Numerical Atmospheric-dispersion Modelling Environment (NAME).

Areas of Expertise Volcanic cloud transport and dispersion   Current Activities Charlie is working in the Volcanic and Chemical Dispersion team of the Atmospheric Dispersion and Air Quality (ADAQ) group within Weather Science. Charlie is currently working on the development of resuspended volcanic

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

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

, 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

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

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

, 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

Tuesday begins with areas of cloud and showery rain, some locally thundery, affecting central and southern regions. These outbreaks will gradually move north-eastwards, allowing increasing amounts of hot sunshine to develop across much of England and Wales by the afternoon. Scotland and Northern

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