LDS Units Flashcards
How much rainfall is a ‘trace’ amount?
Less than 0.05 mm.
What are the units for total daily sunshine?
Tenths of an hour.
What are the units for mean wind speed?
Knots, kn.
1 knot = ? mph
1.15
What does 0 represent on the Beaufort conversion and how many knots is it?
Calm wind speed, less than 1 knot.
What is 1 - 10 kn on the Beaufort conversion?
Light, 1-3 on the scale.
How many knots are classed as “moderate” on the Beaufort scale and how is this represented?
11-16 kn, or 4 on the scale.
What does 5 on the Beaufort scale signify and how many knots is it?
‘Fresh’ wind speed, 17-21 knots.
How is wind direction measured?
To the nearest 10 degrees, from true North.
What are the units for daily mean visibility?
Dm, or decametres.
What are the units for mean pressure?
Hectopascals, hPa.
1hPa = 100Pa
What was the previous unit for measuring pressure and how does this convert to hectopascals?
Millibars, mb.
1hPa = 1mb
How is maximum relative humidity measured?
As percentage water content in the air.
