1. MT23E – Boundary Layer Meteorology IOP, 17/06/2008 Weather and surface conditions Katie Izzard, Avra Theophanous, Rob Warren

2. Synoptic conditions Synoptic chart for 1200 UTC on 17/06/2008 (Analysis from Met Office, Exeter)

3. Satellite image Visible satellite image for 1347 UTC on 17/06/2008 (courtesy of Dundee satellite receiving station)

4. Weather & surface conditions Time (mins) T a (ºC) T w (ºC) T s (ºC) RH (%) Cloud-cover / type Wind direction Notes 0------ 218.013.525.023.55/8 CuSW(1) 418.013.5-23.05/8 CuSW 618.513.5-22.54/8 CuSW 818.513.530.022.54/8 CuS 1018.514.032.022.04/8 CuSW 1219.013.533.022.04/8 CuS(2) 1418.514.034.022.54/8 CuW 1619.014.034.523.05/8 CuW 1819.014.035.022.55/8 CuS 2019.514.035.522.55/8 CuW(3) (1)Sun obscured by cloud around 2 minutes into IOP for approximately 2 minutes (2)Sun obscured by cloud around 12 minutes into IOP for approximately 30 seconds (3)Sun obscured by cloud for the last 30 seconds Pressure at start = 1004.04 hPaPressure at end = 1003.96 hPa Surface conditions: short grass (z 0 ~ 0.03 ± 0.005m); dry but ‘lush’ from recent precipitation

5. Temperature variation Temperature data from Eddy Correlation Mast 2

6. Penman windspeed data Time (BST) Mean windspeed (ms -1 ) Maximum Gust (ms -1 ) 14153.315.34 14202.714.88 14252.915.80 14303.235.64 14353.495.72 Average windspeed between 1415 and 1435 BST = 3.09 ms -1

7. Fetch / Upwind conditions

8. Have a great summer everyone… The End

9. …doing your write ups.

10. Bugger.