Large data set Flashcards
(35 cards)
What is daily mean temperature
The average of the hourly temperature readings during a 24 hour time period
What is rainfall
Rainfall includes solid precipitation such as snow and hail which is melted before being included in any measurements
What are rainfall amounts between 0 and 0.05mm recorded as
Recorded as ‘tr’ or ‘trace’
What is daily total sunshine recorded to
Recorded to the nearest tenth of an hour
What are the only data recorded for oversees locations, state the units for each
- Daily mean temperature, degrees C
- Daily mean pressure, hPa
- Daily mean windspeed, Kn (rounded to 1dp for international)
- Daily total rainfall, mm
- Windspeed Beaufort, most days are ‘light’
What is daily mean wind direction and windspeed recorded in
Windspeed is recorded in knots averaged over 24 hours from midnight to midnight
Mean wind directions are given as bearings and as compass directions (360 degrees at top and subtract from that not adding from 0 clockwise)
Wind direction measures where wind is coming FROM not where its going to
What is the Beaufort scale
A way of categorising mean windspeed
What does a Beaufort scale of 0 mean
That the average speed at 10m above the ground is less than 1 knot and the environment is described as ‘calm’
What does a Beaufort scale of 1-3 mean
That the average speed at 10m above the ground is 1 to 10 knots and the environment is described as ‘Light’
What does a Beaufort scale of 4 mean
That the average speed at 10m above the ground is 11 to 16 knots and the environment is described as ‘Moderate’
What does a Beaufort scale of 5 mean
That the average speed at 10m above the ground is 17 to 21 knots and the environment is described as ‘Fresh’
What is daily maximum gust
The highest instantaneous windspeed recorded
In the daily maximum gust reading, what else is recorded other than windspeed
The direction from which the maximum gust was blowing from
What is daily maximum relative humidity measured as
Given as a percentage of air saturation with water vapour
What conditions do relative humidity’s above 95% give rise to
Give rise to misty or foggy conditions
What are the two time periods the large data set is from
May to October 1987
May to October 2015
What are the 5 UK locations the large data set readings are from
Camborne
Hurn
Heathrow
Leeming
Leuchars
What are the 3 overseas locations the large data set readings are from
Jacksonville FL
Beijing
Perth
What is daily mean cloud cover measured in
Eighths of the sky covered by cloud (Oktas)
What is daily mean visibility
The greatest horizontal distance at which an object can be seen in daylight
What is daily mean visibility measured in
Decametres (Dm) 0-50Dm can be represented at 0
What is daily mean pressure measured in
Hectopascals (hPa)
Who provides the data from the large data set
The met office
Plot roughly where
Camborne
Hurn
Heathrow
Leeming
Leuchars
Are in the UK
From south to north:
(alphabetical order except H and H switch)
Camborne (costal so windier)
Hurn
Heathrow
Leeming
Leuchars (costal so windier)
