Wind & Jets & Fronts Flashcards
Jet streams are caused by
Difference of temperature
Sub tropical jet streams altitude
40,000ft
Polar jet streams altitude
30,000ft
Seasonal arctic front jet altitude
Only in northern hem
At 20,000ft
Seasonal tropical jet (july). Jet stream comes from
The east
Jet streams are no higher than tropopause because
Temperature is then constant
Core of a jet stream is always found in
Hot air
Isotacs?
Where wind speed is all the same
There is no CAT in the
Core
Core of jet stream faces
Cold air
Turbulence categories
Light
Moderate
Severe
Light turbulence
5-15kts
<0.5g at aircraft CG
Moderate turbulence
15-25 kts
0.5-1g
Severe turbulence
> 25 kts
>1.0g at aircraft CG
Broken terrain affect on turbulence
Heavier
If mountains, what type of cloud appear
Lenticular cloud
Horizontal wind-shear rate of change of wind speed
&
Vertical
Kts/1000ft
Kts/100ft
Topography
Wind shear via trees
Macrobursts vs microbursts
Macro cover larger distances.and over 5 minutes
wake turbulence category for a/c determined by aircraft’s…
MTOM
Wake turbulence separation is through
Distance on approach
Minutes on departures
Stable air doesn’t want to
Move up
Quasi stationary front basically means
Not quite cold, not quite warm front. Isobars parallel to front
Slope gradient of warm front
&
Cold front
1: 150
1: 80
Speed of warm front
Cold front
Geostrophic X 2/3
Same as geostrophic wind
