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surface and by thermals, such as those rising from land as it is heated by the sun, but also thermals associated with clouds.  All this turbulence redistributes heat, moisture and the drag on the wind within the boundary layer, as well as pollutants and other constituents of the atmosphere.  In so

by the dawn of instrumental meteorology. Further developments took place in the eighteenth and nineteenth centuries leading to the foundation of the Met Office in 1854.  These pages will introduce you to some of the highlights of our rare book collection. De Negotio Naturali - Albertus Magnus, De Negotio Naturali (on Natural Business) c. 1290 On The Modification Of Clouds - Luke Howard, On the Modification of Clouds 1803

After a chilly start, Saturday will be another fine and dry day for most with plenty of sunshine. Increasing amounts of cloud will move in across the south of the UK with the possibility of some showers in the south of England for a time. A more notable change to our weather moves in overnight

with sunny spells and patchy fair weather cloud, then continued for the rest of the day. Despite the sunshine it was a chilly day with a cool north-westerly wind. Data from Southampton Maximum Temperature/°C: 11.7 Minimum Temperature/°C: 4.4 Rainfall Amount/mm: 0.0 Sunshine Amount/hours: 7.7 General

-altitude aviation sectors, such as business jets. These forecasts include: Wind and temperature data at cruising altitudes Significant weather (SIGWX) charts, which highlight en-route hazards such as: Jet streams Turbulence Icing Cumulonimbus clouds Volcanic ash Tropical cyclones This information

a little: • Embedded (EMBD) cumulonimbus clouds will no longer be included which means that there will not be any areas of “ISOL EMBD CB”, Only OCNL and FRQ amounts of cumulonimbus will be shown. • Tropopause will be shown as contours (as a thin dashed line) instead of spot heights. • CAT areas

during SAWS relocation in May 2018 Work Package 1: Underpinning Science Development (cont.) Achievements so far: • A defrayment with Reading University delivered a multi-instrument climatology of clouds and convection, unique for South Africa, for the evaluation of NWP models for the timing

, possibly with embedded thunderstorms, across some southwestern parts. These will gradually break up into showers, persisting for much of the day. Most other regions will see variable cloud and a scattering of mainly light showers, with the chance of a moderate shower near southern coasts. Cloud and patchy

, particularly in relation to the forecasting of convective cloud and precipitation. Uses of the tephigram Apart from identifying the stability of the atmosphere, the tephigram can be used for a number of other purposes. These include: � � � � � Finding the liquid water content and the relative humidity

. Fraction of horizontal grid square occupied by cloud cover below 1,000 feet above sea level. Fraction of horizontal grid square occupied by cloud in the highlevel cloud height range; from 5,574m (~18,000ft) to 13,608m (~44,500ft). Fraction on horizontal grid square occupied by cloud in the low-level