Storm Forecast Issued: 20:08 Friday, 20th August 2010
Valid: 2010-08-21 00:00:00 - 2010-08-21 23:59:00

Regions Affected
Wales, Midlands, East Anglia and SW England (the remainder of England and Wales, and NW Scotland is included in the WATCH)

Synopsis

Low pressure "Angelika" (FU Berlin) situated to the north of Scotland will dominate the weather across the United Kingdom on Saturday.

To the south of a waving cold front, a warm and very humid airmass is advected across central and southern Britain. Embedded convection is forecast to develop along the front across SW/C-Britain, providing a focus for scattered thunderstorms. The environment in which these will/may develop looks quite favourable for severe development, with a chance for moderate-size hail, and a moderate-intensity tornado possible. However, due to the uncertain extent of thunderstorm coverage, only a THUNDERSTORM threat level has been issued at this stage, but may be upgraded during Saturday. Any storms that do develop will move in a NE direction along the front.

Across NW Scotland, scattered showers in the rPm airmass pose a low threat (20% chance) of thunder and lightning.