Theme for the next two weeks
Unsettled with showers or longer spells of rain. Windy at times. Some drier interludes, but no sign of a return to settled conditions. Temperatures will often be slightly below average, and it will feel chilly during the wet and windy spells. 
Based on data from Sunday 5th September 2010. 

Overview 
A complex area of low pressure will push weather fronts across the UK, and a zonal flow will become established across the UK. Later in the week a temporary ridge of high pressure may bring better conditions to southern and central regions for a time. A similar picture is expected during the second week of the forecast.    
Global Forecast System (GFS) analysis
The GFS is the computer model which we base our 16 day weather forecasts on.   

Mid week
By mid week low pressure will be bringing unsettled and showery weather across the country.          

Temperatures shouldn't be too bad at times in the south, and in brighter spells may still reach 21C.

 

During the early part of the week heavy rain will push east across the country to affect most of us. By 10pm Monday night much of the country is expected to be very wet. The chart below shows this with the greens and yellows indicating where the heaviest rain will be at that time.



Weekend
Some signs of pressure rising to the south, but the general theme is for low pressure to remain in control of the weather. So still mostly unsettled with showers or longer spells of rain for many, although possibly better in the south.       

      

The chart below is for 21st September and shows some very cold air just to the north of Britain. As many of you will know forecasts at this range can be expected to change significantly as the time approaches. However, there have been some signs from the computer models of a polar plunge developing around the 20th September. This fits in with our seasonal forecast, and it could see early snow falling in the Scottish highlands. We'll be keeping a close eye on things!      

Issued 05/09/2010 (next scheduled update 09/09/2010)