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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

matrix www.metoffice.gov.uk © Crown Copyright 2025, Met Office Heathrow D-1 and D0 Graphs LVP threshold: Visibility <600 M www.metoffice.gov.uk © Crown Copyright 2025, Met Office Gatwick D-1 and D0 Graphs LVP threshold: Visibility <550 M Cloud ceiling <200 FT www.metoffice.gov.uk © Crown Copyright

matrix www.metoffice.gov.uk © Crown Copyright 2024, Met Office Heathrow D-1 and D0 Graphs LVP threshold: Visibility <600 m www.metoffice.gov.uk © Crown Copyright 2024, Met Office Gatwick D-1 and D0 Graphs LVP threshold: Visibility <600 m Cloud ceiling <200 ft www.metoffice.gov.uk © Crown Copyright

What is METAR and TAF? METARs provide current conditions; TAFs offer forecast trends METARs are coded weather reports summarising current conditions at aerodromes, including wind, visibility, weather, cloud, temperature, and pressure. TAFs are coded forecasts that describe the most likely weather

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

Tuesday will bring variable cloud and sunny intervals for many areas. Showers are expected from the start in the west, gradually developing further east into the afternoon. Some of these showers could turn heavy at times, so it’s wise to keep an umbrella handy if you’re heading out. In northern

spells will break through, although a few showers are likely in the northwest. Elsewhere, much of central, southern, and eastern England, as well as the remainder of Wales, will experience variable and often large amounts of cloud. However, there will be some sunshine, particularly in eastern areas

of England and northeastern Scotland will experience cooler, cloudier conditions due to onshore breezes. These areas may also see brisk winds, especially in the far east, which could temper the warmth felt elsewhere. Friday night will bring a shift in conditions for parts of the country. Low cloud

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

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