Large Data Set Flashcards
How to convert 1 knot to mph
Times by 1.151
What countries are included in the large data set
UK
Australia (Perth)
US (Jacksonville)
China (Beijing)
Where is include in the UK?
Leuchars Leeming Heathrow Hurn Camborne
How is pressure measured
In hPa (hector pascals)
1/100 of a Pa
What is daily mean total cloud cover measured in
Oktas
How many eighths of the sky is covered
How is daily maximum humidity measured
As a % of max water vapour that could be in the air
Daily mean temperature
Celsius to one dp
Average of 24 hourly temp readings of air temp
Daily total rainfall
Amount of rainfall collected in millimetres from 9am including other precipitation (eg snow and hail) which has melted
When is daily rainfall classed as trace
When less than 0.05mm
Daily total sunshine
Measure of solar radiation exceeding a threshold
Measured in hours and tenths
Daily maximum humidity
How close the air is to being saturated with water as a %
What percentage usually indicates mist and fog?
95%
Daily mean wind speed
1 knot = 1.15 mph
Daily maximum gust
Direction?
Maximum reading during the day
Bearing
Daily mean wind direction
Average bearing to nearest 10 degrees
Cloud cover
Measured on oktas
How many eighths of the sky are covered by cloud
Visibility
Distance an object can be recognised measured with a visimeter or by eye
Measured in decametres (units of 10m) Shown as (-) when unavailable
Pressure
Mean sea level pressure measured in Pa
Give basic observations of large data set (international)
Warmer near equator. Seasons opposite in Perth
Basic observations for UK
Colder further north
Wetter coastal than inland
Wettest in spring
Hottest in summer
