T-6 JX 101 Flashcards
(35 cards)
From surface up, what are the atmospheric layers
Troposphere (^36,000’)
Stratosphere
Ionosphere
Troposphere characteristics
large amounts of moisture and condensation nuclei
Nearly all weather occurs here
What is the abrupt change layer in the rate of temperature decrease?
Tropopause
Tropopause definition
A transition zone between the troposphere and stratosphere. (^36,000’ MSL)
Stratosphere Characteristics
Temp. Inversion
from 36,000’-66,000’
Smooth, thin air
Excellent Visibility
Standard lapse rate
2°c per 1000’
Isothermal lapse rate
Temperature is constant with increasing altitude
Inverted lapse rate
Temperature increases with increased altitude
What is Atmospheric (barometric) pressure
The pressure exerted on the surface by the column directly above it
What are the two units of measurement for atmospheric pressure
Inches of mercury (inHg)
Millibars (mb)
Standard day pressure and Temperature and lapse rate
29.92 inHg / 1013.2 mb
15°c / 59°F
1 inHg per 1000’
Define Station Pressure
Atmospheric pressure measured directly at an airfield or other weather station
Define sea level pressure
The pressure measured from the existing weather if the station were at MSL
Changes in sea level pressure Memory Jogger
“High to low, look out below”
“Low to high, plenty of sky”
Altimeter error temperature
4% per 11°c
Indicated Altitude
What is read on the altimeter
Absolute altitude
Altitude AGL
True Altitude
Altitude in reference to MSL
Pressure Altitude
Altitude above the standard datum plane (29.92 inHg)
Density Altitude
Pressure altitude corrected for temperatude deviations
Pressure gradient directions
High - Outwards/Clockwise
Low - Inwards/Counterclockwise
In what direction do gradient winds flow (Above 2000’ AGL)
Parallel to the isobars
In what direction do gradient winds flow (Below 2000’ AGL)
45° to the isobars
The average height/speed of the jet stream
30,000 MSL
100-150 (up to250 mph)
