UKASF

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A complex area of LOW pressure situated over the United Kingdom will dominate the weather during Monday. A cold and unstable Arctic airmass is present over the whole of the British Isles for the entire duration of this forecast period, with the exception of the extreme southeast where some slightly milder air may move in later in the forecast period due to a developing area of LOW pressure there.

Showers will develop, due to the large temperature differences between the upper atmosphere and the sea surface - these mainly affecting those areas exposed to the gusty northwesterly winds (thus northern and western areas). The showers will be frequent, forming into bands (or troughs) at times, and providing significant snowfall in places due to the cold airmass. Electrical activity seems possible, and hence thundersnow is a strong possibility.

There is a chance for a weak funnel or waterspout to develop. During the evening a warm front approaches the far southeast, introducing some slightly milder air. There is a good deal of uncertainty between the models even at this short timeframe as to the exact path of the warm front. Nevertheless, showers will continue to affect western and northern coastal areas well into the night, though decreasing significantly in coverage.