Weather Quiz 2 Flashcards
Absolute altitude
AGL
indicated altitude
height on altimeter
true altitude
MSL
Pressure altitude
altitude at 29.92
density altitude
pressure converted for temperature differences
If air is colder, how does true and indicated altitude compare
true altitude < indicated altitude
why does steep terrain impact altimeter
dynamic pressure drops
how to calculate density altitude
pressure + (118.8 * (ambient air temp - ISA temp))
where is the strongest pressure gradient
vertically
reading a find flag
triangle
full line
half line
50kts
10kts
5kts
how does pressure gradient affect wind
wind flows high to low, tighter gradient = faster winds
which force has the greatest affect in generating wind
pressure gradient
which way does the wind deflect in the north
right
what are the two forces that keep air to the earth but not in a flat layer
gravity
buoyancy
air flows closer to isobars over land or water
water
what is a jet stream
1-3 bands of fast air between equator and poles
strong narrow band of winds that encircles the earth at mid latittudes
where is the top of jet streams
tropopause
What part of weather kills the most people
air masses - extreme temperatures
what happens when a cold continental front displaces maritime air
pressure decreases (lowest right at boundary layer)
temperature decreases
dew point decreases
winds rotate from SW to NW
what conditions must exist for an air mass to form
stagnate air over an area
warm in tropical/subtropical areas
cold in polar areas
