Bizarre fog covers Cornwall beach despite sunshine forecast

A bizarre weather phenomenon likely left visitors to a Cornish beach surprised despite sunny weather forecast. Fog rolled over Porthminster Beach in St Ives this afternoon, leaving visibility low.

Elsewhere today (May 19), there has been sunshine and warm weather reaching highs of 18°C. It comes after heavy rainfall and thunderstorms on Saturday which saw flooding in some areas of Devon.

According to the Met Office, coastal fog usually forms when relatively warm, moist air passes over a cool surface. In the UK, the most common occurrence of coastal fog is when warm air moves over the cool surface of the North Sea towards the east coast of the UK.


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It said: "The impact, location and movement of coastal fog depend upon a number of conditions, including wind strength, wind direction and land temperature. If the land temperature is warm, the fog can quickly dissipate as the parcel of air warms. However, if the land temperature is cooler, the fog can linger for a longer time."

The Exeter-based weather forecasters predicted low cloud and mist first thing this morning, which would perhaps linger across the Isles of Scilly. It added: "Otherwise a much warmer day than on Saturday with plenty of strong sunshine. Isolated showers are possible this afternoon with perhaps the odd thunderstorm in Cornwall. Maximum temperature 22 °C."

Meanwhile, tonight it said pockets of mist or fog may form with some low cloud too. It is also predicted to turn locally chilly, with a minimum temperature of 4 °C.

The forecast for the next few days predicts more cloud cover and some showers throughout but there will also be plenty of sunshine and warm temperatures, reaching a high of 21 °C on Monday (May 20).


Some low cloud is possible at first, especially in the east. This gradually lifting and clearing to leave plenty of strong sunshine. Very isolated afternoon showers are possible. Feeling warm. Maximum temperature 21 °C.

Outlook for Tuesday to Thursday:

Somewhat cloudier through this period but still warm in the sunny spells. Showers are likely at times, these heaviest on Tuesday when thunder is possible. Perhaps staying dry in places.

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