UKASF
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Storm Forecast Issued: 2009-12-20 00:29:00 Valid: 2009-12-20 00:00:00 - 2009-12-20 23:59:00 Regions Affected Northern Ireland, north Wales, Northwest England, western Ireland and most of Scotland (excluding the far east, which is included in the WATCH, along with the remainder of the United Kingdom) Synopsis A complex area of LOW pressure situated over northern United Kingdom will dominate the weather during Sunday. Behind a cold front sinking southeastwards during the early hours, exiting into France by dawn, a cold and unstable Arctic airmass is advected southwards across the whole of the British Isles. 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. Showers will continue to affect the same areas well into the night. |
