'Valid for Wed 19 July 2006 to Fri 28 July 2006
An area of high pressure will remain close to the UK for much of the period, giving a good deal of dry and sunny weather. Weak frontal system will remain close to the far northwest, and here we will see some rain at times. During the period, pressure is expected to fall across southern areas of England and Wales, with an increasing risk of thundery showers spreading from the south. Temperatures mostly in the warm to very warm category, but locally hot across central and southern areas. Cooler in the far north.'
Note they dont say the posistion of the high. Also the fact that pressure drops to the south indicates a hot unstable flow.
http://www.metoffice.com/weather/europe/uk...look/index.html