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A Level Maths > LDS > Flashcards

LDS Flashcards

1
Q

What’s is the large data set

A

Contains the weather data
For 5 UK weather stations
And 3 overseas weather stations

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2
Q

When is data held for

A

May-October 1987

May-October 2015

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3
Q

What are the UK weather stations

A 
Cambourne
Heathrow
Hurn
Leeming
Leuchars
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4
Q

Overseas weather stations

A

Beijing
Jacksonville
Perth

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5
Q

How many variables does the data set hold information for

A

11

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6
Q

What are the 11 variables

A 
Daily maximum temperature
Daily maximum relative humidity
Daily maximum gust
Daily maximum wind direction
Daily maximum gust direction
Daily total rainfall
Daily total sunshine
Daily mean wind speed
Cloud cover
Visibility
Pressure
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7
Q

na or n/a

A

Data not available

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8
Q

Daily maximum temperature

A

Degrees Celsius
1.d.p
Negative means below 0 Degrees Celsius

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9
Q

Which of the 11 variables are given for overseas weather stations

A

Daily maximum temperature
Daily total rainfall
Daily mean wind speed
Pressure

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10
Q

Daily total rainfall

A

mm

If total amount < 0.05mm then its referred to as a trace of rain

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11
Q

What is a trace of rain

A

less than 0.05mm total rainfall collected

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12
Q

Daily total sunshine

A

Given in hours

1.d.p

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13
Q

Daily maximum relative humidity

A

How close air is to being saturated with water vapour
Percentages
Relative humidity above 95% associated with mist and fog

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14
Q

Mist and fog associated with

A

Relative humidity above 95%

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15
Q

Daily mean wind speed

A

Knots
Categorised according to the Beaufort scale
An empirical and discrete scale

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16
Q

1 knot in mph

A

1.15mph

17
Q

What is the Beaufort scale

A

An empirical and discrete scale

18
Q

Daily maximum gust

A

Daily maximum instantaneous speed that occurred over a period of 24 hours

19
Q

Daily maximum wind direction

A

Two data processes used to obtain this
In degrees relative to the true north
Corresponding cardinal direction is given

20
Q

Daily maximum gust direction

A

Direction wind was blowing in the hour the corresponding daily maximum gust occurred
In degrees relative to the true north
Corresponding cardinal direction also given

21
Q

Cloud cover

A 
Discrete variable in the data set
Measurement of the fraction of the celestial dome covered by cloud
Measured in eights
Technical unit is oktas
0 oktas is a completely clear sky
8 oktas is completely overcast
22
Q

Visibility

A

Measured horizontally
In metres
Dash indicates unavailable data

23
Q

Pressure

A 
In hectopascals (hPa)
Previous unit was the millibar (mb)
1 bar = 100 millibars =100 hectopascals
24
Q

Cardinal direction

A

Non numerical scale

Qualititive

25
Q

tr

A

Trace of rain

Less than 0.05mm

26
Q

Issue with daily total sunshine, mean wind speed, maximum gust

A

Lots of gaps in days where no data recorded

27
Q

Probability for cloud cover

A

1/9 if uniform

0 to 8 means 9 categories

28
Q

Perth key fact

A

Only one in the southern hemisphere

29
Q

What can’t you use a normal approximation for

A

Daily total rainfall; non-uniform/symetrical

SEE MATHS CAP

30
Q

Cardinal direction

A

N
E
S
W

NE
NW
SE
SW

etc

31
Q

How is Perth different for weather

A

Has its winter between July and September

32
Q

2 big things about 1987

A

Great storm in October UK, 15th to 16th and 100knot gusts

Hurricane floyd in October (affects Jacksonville) 1st to 2nd

33
Q

Something to note about 2015

A

Hurricane Joaquin in October (affects Jacksonville)

34
Q

End of spring

A

May

35
Q

Summer

A

June to september

36
Q

Winter start/autumn

A

October

37
Q

Coldest UK Station

A

Leuchars (most northerly)

38
Q

Wettest weather station

A

Cambourne

39
Q

Driest weather station UK

A

Heathrow

A Level Maths (6 decks)

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