Storm Forecast Issued: 16:11 Sunday, 29th November 2009
Valid: 2009-11-30 00:00:00 - 2009-11-30 23:59:00

Regions Affected
East Anglia, Southeast & Central Southern England and Shetland (eastern Scotland, southeast Wales, eastern England and Southwest England are included in the WATCH)

Synopsis

An area of LOW pressure moving slowly eastwards across southern England, followed by a ridge of HIGH pressure, will dominate the weather across the United Kingdom on Monday.

Ahead of an occlusion, situated over Wales and Northern England at the start of this forecast period, numerous showers and isolated thunderstorms are expected to continue to affect southeastern/central southern England and East Anglia through the night and morning hours. Hail seems likely given the cold airmass present, and there is a slight risk of a funnel or weak tornado development. The risk of electrical activity rapidly decreases during the afternoon hours as the occlusion approaches these regions.

Most other places will remain largely dry due to the ridge of HIGH pressure. However, there is good agreement for a convergence zone to develop along the Irish Sea, and is likely to be located here for much of the day. Due to a rise in pressure, cloud heights don't appear to be high enough for electrical activity, and thus only a WATCH level has been issued here. However, a brief convergence-type funnel is possible.

Across other eastern coastal counties of England and Scotland, scattered showers are expected to develop, largely due to the difference in sea surface and land temperatures. Cloud heights will be limited here, though there is a chance of electrical activity to occur, particularly in the North Sea and around Shetland. These showers are likely to be quite wintry in nature.