group a4 overview of weather conditions 16 th june 2008 iop 14:27 – 14:47 bst
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Group A4Group A4Overview of Weather Overview of Weather
ConditionsConditions
1616thth June 2008 IOP June 2008 IOP
14:27 – 14:47 BST14:27 – 14:47 BST
Prior IOP Prior IOP Met Office surface pressure at 12pm Visible satellite at 1pm
Atmospheric Observatory Fluxes and Temperatures
www.metoffice.gov.uk www.metoffice.gov.uk
Surface Energy Fluxes
-400
-300
-200
-100
0
100
200
300
400
500
600
700
800
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24
Time of day (hrs)
En
erg
y F
lux
(Wm
-2)
LE Wm-2
G Wm-2
H Wm-2
Rn Wm-2
Day 168
During the IOP (1)During the IOP (1)2pm visible satellite
Observed weatherTimeTime Pressure Pressure
(hPa)(hPa)TTd d ((ooC)C) TTw w ((ooC)C) TTgrass grass ((ooC)C) Wind Wind
directiondirectionCloud Cloud CoverCover
Cloud TypeCloud Type Maximum Maximum Wind Wind Gust/msGust/ms-1-1
14:2714:27 1003.641003.64 1818 1313 22.022.0 NWNW 44 Cumulus, Cumulus, cirrus, alto cirrus, alto stratus, alto stratus, alto cumuluscumulus
14:3214:32 1003.671003.67 17.517.5 12.2512.25 22.022.0 NWNW 44 ‘’‘’extra large extra large cumulus cloudcumulus cloud
3.163.16
14:3714:37 1003.601003.60 17.017.0 12.012.0 22.022.0 NWNW 55 ‘’‘’
14:4214:42 1003.621003.62 17.017.0 12.012.0 21.521.5 NENE 55 ‘’‘’
14:4714:47 1003.661003.66 17.017.0 12.012.0 21.521.5 NN 55 ‘’‘’
Convective clouds over field site
www.met.rdg.ac.uk
www.metoffice.gov.uk
During the IOP (2)During the IOP (2)T as a function of time
y = 0.0002x + 16.607
1616.216.416.616.8
1717.217.417.617.8
18
0 500 1000 1500
time
deg
rees
cel
ciu
s
Temperature
Temp trendline
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.
Air Temperature, Dewpoint and Relative Humidity
02468
1012141618202224262830
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24
Time of day (hrs)
Tem
p (
0 C )
0
10
20
30
40
50
60
70
80
90
100
Rel
ativ
e h
um
idit
y (%
)
Air temperature
Dewpoint temperature
Relative humidity
Mean temp: 13.71
Day 168
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