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If you are interested in clouds or thunderstorms, UK climate or weather extremes, this series of factsheets clearly describes and illustrates the processes involved.

These factsheets clearly describe and illustrate the processes involved in global weather and climate, providing the most up-to-date answers and information. 1. Clouds The current classification of clouds is based upon those originated by Luke Howard (1772-1864), a London pharmacist and amateur

, particularly over coastal areas and hills where it brings low clouds, drizzle and local hill fog. Judging from the number of isobars the gradient wind does not seem to be an issue but the complexity of the frontal system over the Atlantic indicates that conditions will deteriorate quickly

of the atmosphere model to the surface model, where soil moisture has been shown to affect initiation. Much of the above is based on comparisons between model and observations for surface rainfall. It is possible that updrafts or clouds may compare better to observations and that the issue is related

Document Issue History Version Issue Date Change Description Owner V1 April 2019 New document D Hardy V2 July 2021 Replacement of AIRMET with GAMETs D Hardy V3 May 2022 Removal of EURO Forecast precip rate, Forecast precip type, Forecast vis & Forecast total cloud weather may layers D Hardy © Crown

Isles on south or south-easterly winds ahead of slow-moving Atlantic fronts. When high pressure prevails during the winter, strong cooling near the surface makes the air stable, rather than cold and moist. Low cloud and poor visibility may be very persistent under such conditions. • The record

, instead of spot heights. The medium level SIGWX will combine the in-cloud turbulence and icing areas into an overall solely icing area. Changes to drawing style, based on the WAFS gridded turbulence data set T+24 SIGWX charts will be produced in colour and a different line style will indicate icing

the air stable, rather than cold and moist. Low cloud and poor visibility may be very persistent under such conditions. • The record breaking temperatures of August 2003 were caused by a tropical continental air mass. Summer Winter Temperature: Very warm or hot Average Humidity: Relatively dry Rather

prescribed sea surface temperatures. It is recommended to base the simulations on the OSTIA sea surface temperature analysis, or a similar product. 8. Cloud droplet number concentrations Aerosol or CCN concentrations are not specified. We suggest, however, to fix the cloud droplet number

of air become warmer than their surroundings and begin to rise. Where these warm bubbles of air (thermals) rise to sufficient height, shallow cumulus clouds develop. If the temperature in the surrounding atmosphere decreases rapidly with height (an unstable atmosphere), the warm bubbles may rise

interlude, it turned wet almost everywhere by the 10th. Around mid-month there was a spell of warm, humid, showery weather with thunderstorms especially in central, western and southern areas, and persistent low cloud along the northeast coast. There was a hot sunny spell especially over England from