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

SummarySummary