Aviation Weather

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Aviation Weather

• Air Temperature and Pressure Affecting Aircraft

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Hot air is thin, less dense, and rises.
Cold air is thick, heavy, and sinks
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Smoke will not rise in heavy, cooler air.
Warmer air
Cooler Air
Temperature inversion, warm air above cooler air,
therefore, the cool air does not rise, being
heavier than warm air, it stays near the ground.
The energy of crickets is directly proportional
to the outside temperature. Count the number of
times a cricket chirps in 15 seconds then add 37
to that number and youll have the correct
temperature in degrees Fahrenheit.
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Temperature inversion
45 degrees
28 degrees
Cloud produces rain because the cloud exists in a
warmer area above the freezing level.
But the rain is falling into colder air below the
freezing level.
The airplanes skin is also below freezing, and
the cold rain will freeze to the plane as clear
ice!
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If aircraft course is between 0 and 179 degrees,
fly odd thousand, 5000, 7000, 9000,11,000, etc.
If airplane course is between 180 and 359
degrees, fly even thousand, 4000, 6000, 8000,
10,000, etc .
ALWAYS set your altimeter to the local barometric
pressure within 100 miles of your location.
IF YOU DONT
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Air rises in low pressure areas and the wind is
counterclockwise.
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Air sinks in a high pressure area and the wind is
clockwise.
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Wind
Shear Zone
Shear Zone
Wind
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Lots of turbulence in a shear zone!
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Counterclockwise-cloud rotation in the rising air
around a low pressure area.
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Weather Charts
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Icing
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Aircraft Performance
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DA 3000
DA 8000
PA 4750
PA 4750
TEMP -8 F TEMP 18 C
TEMP 98
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PA 6000
PA 6000
PA 1000
Outside air temperature 20 C
ROC 650 fpm
Rate of climb 375 fpm
Outside air temperature -20 C
Rate of climb 580 fpm
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Take Off Distance Chart
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Microburst / Windshear
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Windshear is any rapid change in wind direction
or velocity. Severe windshear is a rapid change
in wind direction or velocity causing airspeed
changes greater than 15 knots(17mph) or
vertical speed changes greater than 500 feet per
minute (around 5-6 mph in the vertical direction
that is a lot).
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The life span of a Microburst is around 15-20
minutes.
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Wind variations at low altitude have long been
recognized as a serious hazard to airplanes
during takeoff and approach.
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So you can see that a sudden change of wind speed
can change the airspeed and therefore, change the
amount of lift keeping the airplane in the air.
If the airplane is going slow, like on take off
or landing, this can be very dangerous.
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This is not a cloud it is dust and dirt
picked up by a GIANT microburst!!!
Here comes someone stupid!!
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AIRSPEED GROUND SPEED or - WIND SPEED
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Wingtip Vortices
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