Chapter 1 Large Data Set (AS) Flashcards
What is daily mean temperature measured in?
degrees Celcius (°C) to 1 d.p
What is daily total rainfall measured in?
millimetres (mm) to 1 d.p
What is daily total sunshine measured in?
hours (hr) to 1 d.p
What is daily maximum relative humidity measured in?
percentage (%) to the nearest integer
What is daily mean windspeed measured in?
- knots (kn) to the nearest integer
- Beaufort Conversion (calm, light, moderate etc…)
What is daily mean wind direction measured in?
- degrees (°) to the nearest 10
- cardinal direction (N, S, SE, NSN, etc..)
What is daily maximum gust measured in?
knots (kn) to the nearest integer
What is daily maximum gust direction measured in?
- degrees (°) to the nearest 10
- cardinal direction (N, S, SE, NSN, etc..)
What is cloud cover measured in?
oktas, where one okta = one eighth of the sky covered
What is daily mean visibility measured in?
decametres (Dm / dam) to the nearest 100
1 Dm = 10m
What is daily mean pressure measured in?
hectopascals (hPa) to the nearest integer
1hPa = 100 Pa = 1 millibar
What is a trace (tr) value?
A trace value is less than 0.05mm of daily total rainfall. In calculations it can be rounded to 0.
How can you estimate if a given day is misty or foggy?
A daily maximum relative humidity of over 95% indicates mist or fog.
Where is missing data (‘n/a’ or ‘-‘) found in the data set?
- The first half of May 1987 has missing values in UK locations for total daily total sunshine, mean windspeed and maximum gust.
- Other ‘n/a’ and ‘-‘ values can also be found haphazardly around the data set.
What four variables are recorded for the three international locations?
The three international cities only contain data for daily mean temperature, daily total rainfall, daily mean pressure and daily mean windspeed.
Which five locations are near the coast?
Jacksonville, Perth, Camborne, Hurn, Leuchars
How could Perth being in the Southern hemisphere affect data comparison?
Perth experiences the opposite season to the other locations in the data set.
Which variable is discrete?
Cloud cover is the only discrete variable in the data set.
What variables were affected by the Great Storm of 1987 in the UK?
- Daily mean wind speed, daily maximum gust, daily total rainfall.
- The Great Storm has less of an impact on daily total sunshine and cloud cover because it’s usually cloudy and less sunny in October anyways.
When was the Great Storm of 1987?
15th and 16th of October
How many days are covered in the data set in total?
184 days
Where is Leuchars?
Leuchars is on the East Coast of Scotland.
Where is Leeming?
Leeming is in North Yorkshire. It is not on the coast.
Where is Heathrow?
Heathrow is in Greater London. It is not on the coast.
