The Met Office has played down predictions of a mini heatwave in the UK to start September
Predictions have suggested the UK could be set for a mini heatwave in September thanks to an ‘Iberian Plume’ bringing temperatures of up to 26C.
Very warm air pushing north from the Spanish plateau on a southerly airflow. This can happen at almost any time of year but during the summer months the extra warmth and moisture lead to increased energy available for storm developmentStrong summer sunshine heating air at and near the surface across France and the UKHowever, The Met Office is not expecting temperatures to reach Barcelona levels during the first week of September.
“There is no sign of any spell that would meet heatwave criteria in our outlook, and while settled conditions could lead to higher temperatures during the day these will be offset by cooler overnight periods.”explains: “The very warm air moving northwards from Spain towards the UK will rise as hot air is less dense than cold air. As this unstable air rises it cools leading to the formation of clouds, in this case cumulonimbus or thunder clouds.
“The very warm air from Spain forms a layer at height and acts as a lid, initially preventing warm air rising from the surface. However, as the air at the surface increases in temperature eventually it warms enough to break through this barrier and air can then rise from the surface up to the higher parts of the troposphere.
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