Large Data Set Flashcards
Which months are included in the large data set?
May to October
Which years are included in the large data set?
1987 and 2015
Which cities are included in the large data set?
Leuchars, Leeming, Heathrow, Hurn, Camborne
Jacksonville, Beijing, Perth
Where is Leuchars?
East coast of Scotland. So northern hemisphere and near the sea
Where is Leeming?
North England, central. So northern hemisphere and not near the sea
Where is Heathrow?
South east England, not near the sea. Northern hemisphere
Where is Hurn?
South coast of England, central. Near the sea, northern hemisphere
Where is Camborne?
South West England. Cornwall area. Northern hemisphere, near the sea
Where is Jacksonville?
Northern Florida, east side. Near the sea, northern hemipshere
Where is Beijing?
Northern hemisphere. North east China. Not coastal
Where is Perth?
South west coast of Australia. Coastal. Southern Hemisphere
How many days are there in each of the months of the large data set?
May 31 June 30 July 31 August 31 September 30 October 31
What are the weather variables?
Daily mean temperature
Daily total rainfall
Daily total sunshine
Daily mean windspeed, and Beaufort conversion
Daily maximum gust
Daily maximum relative humidity
Daily mean total cloud
Daily mean visability
Daily mean pressure
Daily mean wind direction, and Cardinal direction
Daily maxJust corresponding direction, and cardinal direction
What is the accuracy of daily mean temperature?
A tenth of a degree centigrade. Eg, 10.2
What is the accuracy of daily total rainfall?
Tenth of a mm. Eg, 1.4 mm
What is the accuracy of daily total sunshine?
Tenth of an hour. Eg, 12.3 hours
What is the accuracy for daily mean windspeed?
Nearest whole knot. Eg, 6 kn
What are the values the Beaufort conversion (windspeed) can take?
Light, moderate, fresh (increasing windiness)
N/a
What is the accuracy of daily maximum gust?
Nearest knot, eg 27 kn
What are the units, and accuracy of daily maximum relative humidity?
Percentage, nearest percent. Eg, 67%
What is the unit and accuracy for daily mean total cloud? What is the range of the unit?
Oktas. Nearest whole okta. Ranges from 0 to 8 oktas, so there are 9 possible values
What is the accuracy for daily mean visibility? Units?
Nearest hundred decametres. Eg, 1500 Dm
What is the accuracy and units of daily mean pressure?
Nearest whole hPa. Eg, 1017 hPa. Hectopascal. Hecto = 10^2
What is the accuracy of daily mean wind direction?
Nearest 10°
Or for cardinal direction, up to 3 letters. Eg, both N and WNW are acceptable
What is the accuracy for daily max gust corresponding direction?
Nearest 10°
Or for cardinal direction, up to 3 letters. Eg, both N and WNW are acceptable
What is daily mean temperature? What does n/a mean for this variable?
The average of the hourly temperature readings during this period
N/a = not available
What is daily total rainfall? What does tr and n/a mean for this variable?
It includes any solid precipitation, such as snow or hail, which is melted and measured in the same way as rainfall
tr = trace = amount less than 0.05 mm
N/a = not available
What is daily maximum relative humidity?
The relative humidity is a measure of how close the air is to being saturated with water vapour. Relative humidities above 95% are associated with mist and fog
1 knot = [ ] mph
1.15
How is the daily mean wind speed calculated?
It is averaged over the 24 hours
What is the daily maximum gust?
The Maximum instantaneous speed that occurred during the 24 hours
How is daily mean wind direction are calculated?
It is averaged over the 24 hours
What is the direction of the maximum gust?
The direction from which the wind was blowing when the maximum gust during the hour commencing at the time of entry occurred. Angle measured from true north
In which locations, are the wind and gust direction also measured in cardinal directions, as well as degrees?
All the UK locations
What is cloud cover?
The fraction of the celestial dome covered by cloud
What is visibility defined as?
The greatest distance at which an object can be seen and recognised in daylight, or at night could be seen and recognised if the general illumination were raised the daylight level. Measured horizontally.
What indicates that a value for visibility is not available?
A dash
1 hPa = [ ] millibars
1
Which variables do the foreign locations have data for?
Daily mean air temp Rainfall Daily mean pressure Daily mean windspeed Windspeed (Beaufort conversion)
When was the British hurricane?
15th/16th October 1987
