Chapter 10 - Wind Flashcards
How is surface wind measured
By an Anemometer 10m above the ground
What is calm winds
1 knot or less
What is a Lull
A sudden drop in wind
What is a Gust
Sudden increase in wind 10 knots
gale =
43-47 knots
storm =
48 - 63 knots
Hurricane =
64 +
which north are runways aligned with
Magnetic
Squall =
An increase of wind that last more than a minute
Met reports use which north
True
ATC (ATIS) reports use which north
Magnetic
Wind moving clockwise is called
Veering
Wind moving anti clockwise is called
Backing
If isobars are close together which wind does it indicate?
Strong
Wind speed is directly proportional to? It also cause air to move from high to low pressure
Pressure Force Gradient
Where in the world is the Coriolis effect least?
Equator
Which way does the Coriolis effect deflect in the Northern hemisphere
Right
Which way does the Coriolis effect deflect in the Southern hemisphere
Left
Increase in Latitude (towards the poles) does what to the Coriolis effect?
increases
Geostrophic Wind is
When air is moving from H to L and is effected by the Coriolis effect.
The PGF and Coriolis combined when they are equal and opposite to change the wind direction to line up with the straight ISO bars
Gradient Wind is
PGF, CF and centrifugal force combine to create curved ISO bars.
Because the centrifugal force is opposing the CF it causes the wind to follow the ISO bars around a depression or high.