1. Group A4 Overview of Weather Conditions 16 th June 2008 IOP 14:27 – 14:47 BST

2. Prior IOP Met Office surface pressure at 12pmVisible satellite at 1pm Atmospheric Observatory Fluxes and Temperatures www.metoffice.gov.uk

3. During the IOP (1) 2pm visible satellite Observed weatherTime Pressure (hPa) T d ( o C) T w ( o C) T grass ( o C) Wind direction Cloud Cover Cloud Type Maximum Wind Gust/ms -1 14:271003.64181322.0NW4 Cumulus, cirrus, alto stratus, alto cumulus 14:321003.6717.512.2522.0NW4 ‘’extra large cumulus cloud 3.16 14:371003.6017.012.022.0NW5‘’ 14:421003.6217.012.021.5NE5‘’ 14:471003.6617.012.021.5N5‘’ Convective clouds over field site www.met.rdg.ac.uk www.metoffice.gov.uk

4. During the IOP (2) Air temperature from correlation experiment Penman data Hybrid aerial photo showing the observatory Mean wind direction Image from maps.live.com Fetch – The distance upstream of a measurement site that is relatively uniform.

5. Summary