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to the formation of cumulonimbus clouds, towering, dense clouds capable of producing heavy rain, hail, and lightning. Lightning is a massive electrical discharge caused by the separation of positive and negative charges within a storm cloud. As the storm develops, ice particles and hailstones collide

. 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

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

also see isolated highs above 30°C. Elsewhere, temperatures will generally range from the low to mid-20s Celsius, with Shetland remaining cooler in the mid to high teens. Coastal areas, particularly in southwest England and Wales, will feel cooler compared to Tuesday. Medium-level cloud may produce

of rain 🌧️ pic.twitter.com/KQPqvUGmui — Met Office (@metoffice) September 21, 2025 Monday night will bring clear skies for many, allowing a patchy rural frost to develop, particularly in northern and western areas. Variable cloud and a few coastal showers will persist in the north and east

also see isolated highs above 30°C. Elsewhere, temperatures will generally range from the low to mid-20s Celsius, with Shetland remaining cooler in the mid to high teens. Coastal areas, particularly in southwest England and Wales, will feel cooler compared to Tuesday. Medium-level cloud may produce

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

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

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

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