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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

AS Altostratus ASR Altimeter setting region ATD Arrival Time Difference AUG August AUTO Automated METAR (produced with CAA approval outside normal operational hours) Return to top B BASE Cloud base BCFG Fog patches BECMG Becoming BKN Broken (5 to 7 oktas) BL Blowing BLW Below BR Mist BTN Between

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

Friday will begin dry and fine for many areas, with long spells of sunshine. However, the sunshine will become increasingly hazy as the day progresses. Eastern and southeastern England may see more cloud, with some showers likely during the morning, but these will fade into the afternoon, allowing

, 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

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

. Chance of cloud-free hill tops above 600m: 30% at first, lowering 10% by mid-morning, then lifting 75% by midafternoon Low Cloud and visibility: Good or very good becoming moderate or poor in rain and showers, very poor in snow and within cloud, which will be quite extensive from 500m at first

showers, these wintry above 400m. Cloud thickening from the west to bring periods of rain from around mid-day, perhaps turning heavier during the afternoon, before becoming patchy and light for the evening. Chance of cloud-free hill tops above 600m: 75% at dawn becoming 10% for the afternoon Low cloud

. Breezy conditions will persist, and temperatures will hover near or slightly below seasonal averages. Monday night will see a shift to drier conditions for many, though showers in the north will drift southward, concentrating along North Sea coastal counties. Cloud cover will increase in the far