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tops above 800m. Strong winds and gales later. Feeling cold. Chance of cloud-free hill tops above 700m: Nil. Low cloud and visibility: Overcast cloud with bases down to 400-600m, falling to lower slopes in heavy rain. Very poor visibility in cloud and heavy rain, good for a time in the morning outside

and characteristic • Visibility • Amount of cloud • Type of cloud identified by observer • Height of cloud base • Present and past weather • Duration of sunshine • Short wave solar radiation intensity • State of ground and of concrete slab identified by observer The measurement of almost all

Simon uses ground-based instruments to observe and better understand aerosol, cloud and radiation processes, so as to improve NWP forecast models.

Areas of expertise Aerosol microphysics; Radiative effects of aerosols; Cloud microphysics (boundary layer). Publications by Simon Current Activities  Simon carries out analysis and quality control on data gathered from ground-based instrumentation. This includes in-situ and remote sensing

front is slow-moving across southern England (the crosses on the front indicate that it is weakening). Despite becoming less active this front retains some of its characteristics. It is likely that significant amounts of cloud will be trapped under the ridge and this could be thick enough to generate

, though the far north can expect a scattering of showers. Later in the day, cloud will increase across western Scotland and the Northern Isles, bringing occasional rain or drizzle. Winds will be a notable feature in the north, with gusty conditions especially to the lee of hills, while the south

at 10m above the ground • Atmospheric pressure at the station level and reduced to mean sea level • Pressure tendency and characteristic • Visibility • Amount of cloud • Type of cloud identified by observer • Height of cloud base • Present and past weather • Duration of sunshine • Short wave solar

) and a sharp or rumbling sound (thunder). Thunderstorms are associated with convective clouds and are most often, but not necessarily, accompanied by precipitation at the ground. Cumulonimbus clouds (Latin: cumulus – heap; nimbus – rainy cloud) Heavy and dense cloud, of considerable vertical extent

Dr Keith Williams Keith is the Head of Atmospheric Processes and Parametrizations and conducts research into process-orientated model evaluation. Dr Paul Barrett Paul leads research into the representation of clouds and radiation Dr Martin Best Martin manages the research undertaken on land surface

School of Earth and Environment INSTITUTE FOR CLIMATE & ATMOSPHERIC SCIENCE A new approach to quantifying aerosol-cloud radiative effect through process-based constraints on climate model parameters Kunal Ghosh Lea Provost, Leighton Regayre and Ken Carslaw (ICAS, University of Leeds), Jill S

, though the far north can expect a scattering of showers. Later in the day, cloud will increase across western Scotland and the Northern Isles, bringing occasional rain or drizzle. Winds will be a notable feature in the north, with gusty conditions especially to the lee of hills, while the south