large data set Flashcards
what is daily mean air temperature measured in
degrees to one decimal place
what does n/a mean
not available
which measurements might have n/a
daily mean air temperature
daily mean wind speed
daily total sunshine
daily max relative humidity
what months are covered
may to october 1987 and 2015
what are the five uk locations from north to south
leuchars
leeming
heathrow
hurn
cambourne
3 overseas locations
Jacksonville (north hemisphere)
Beijing (north hemisphere)
Perth (southern hemisphere)
what is rainfall measured in
mm
what does tr mean
trace - less than 0.05 mm
When did perth have more than 100mm of rainfall
in May 1987 and June 2015
what is daily mean pressure measured in
hectoPascals to nearest whole number
what is high pressure associated with
good weather
what is low pressure associated with
rain cold and cloud
UK interval for daily mean pressure
980-1040 hPa
overseas interval for daily mean pressure
1000-1040 hPa
how is daily mean wind speed measured
knots to 1 dp
konts to mph
1 knot = 1.15 mph
what is the beauford scale
measures wind speed with words: calm, light, moderate, fresh, strong
Uk locations for daily mean windspeed
mostly 1-15 knots (light to moderate)
overseas daily mean windspeed
mostly 1-10 (light)
occasionally up to approx 20 knots
uk only variables
daily total sunshine
daily max gust
daily max humidity
daily mean total cloud
visibility
daily mean wind direction and gust direction
to what is daily total sunshine measured
hours to the nearest tenth
values are from…. for daily total sunshine
0-16
how is daily max gust measured
knots
how is daily max relative humidity measured
as a percentage of saturation
over… of humidity is associated with fog
95%
how is cloud cover measured
oktas
what does 0 oktas mean
less than 1/8 of the sky is covered
what does 8 oktas mean
more than 7/8 of the sky is covered
how is visibility measured
distance seen horizontally
decametres Dm
decametres to metres
1Dm=10m
visibility and mist
<200 Dm
visibility and fog
<100Dm
