Weather Flashcards
Increase in Temperature and Pressure Every 1000 Ft
2C Increase and 1 inmg decrease
+
Heavy
TS
Thunderstorm
RA
Rain
BR
Mist
Ao1
No Precip
Ao2
With Precip
When are Convective SIGMETS Issued?
Surface winds greater then 50 kts and hail at SRFC >= 3/4 in or tornadoes
High Density Altitude
Low density air, hot, humid, high
What can cause low level Wind shear?
Passing frontal systems, thunderstorms, and temperature inversions
What is a Microburst associated with?
Convective precipitation into dry air at a cloud base
What is Microburst a type of
low-level wind shear
What is the lifespan and speed of a microburst
5-15 min, with downdrafts of up to 6000fpm and headwind losses of 30-90 knots
What is Atmospheric stability
The measure of an atmosphere’s ability to resist vertical motion
What determines the stability of the air?
Moisture and Temperature
What is Stable Air
Cool, dry air, good and generally clear weather. Stratiform clouds and fog, continuous precipitation and smooth air, fair to poor viability.
What is Unstable air
Moist and warm, typically forms thunderstorms can can have good visability but rough air
Upslope Fog
Requires Wind
Steam Fog
Low level turbulence and icing can becom hazardous
Precipitation induced Fog
Advection Fog
Requires wind, air mass moves inland form the coast in the winter
Radiation Fog
Frequency forms when warm moist air exists over low areas on clear and calm nights
What is Temperurture inversion and what are its characteristics
When warm air is n top of some cold air. Smooth air and poor visability
Warm Front
Rain and low ceilings in from, t-storms less likely
Cold Fromt
Cloudy, hail in advance of front, storms along front, clear behind
Speed of wind at mountain top level
> 25 knots suggests some turbulence
When should you be take caution in mountain flying wind
40kt wind
Mount flying with stratified clouds
Stable air
Moutning flying with lenticular and/or rotor clouds
Suggest mountain wave: expect turnulance many miles to lee of mountains. Relatively smooth flight on the windward side
Convective vlouds on mountains
If they are on the windward side it sujests unstable air and turbulence on either side of the mountain
What are VFR conditions?
Ceiling>+ 1000ft AGL and/or visibility >=3 miles. Scattered clouds don’t mean ceiling
What are the conditions necessary for structural icing?
Visible weather(rain, or cloud drops) and temperature of the surface of the object must be 0C or colder
What is the first stage of the thunderstorm life cycle?
Updraft varies in strength, extends from near surface to cloud top inadvisable to operate drone( 3-5 mile height)
What is the second stage of the Thunderstorm Life Cycle
Precipitations begins to fall from the cloud base and it signals that downdraft had developed and the cell has entered the mature stage(5-10 mile height)
What is the third stage of the Thunderstorm life cycle?
Rain has ended, downdrafts abated( 5-7 mile height)
High Air Masses
Rotate right, good weather
Low air masses
Rotate Left, poor weather
What is a frontal passage marked by?
A change in temperature and wind directions
Class A Airspace
18000 MSL to FL600
Class B Airspace
Surface to 10000 MSL
Class C Airspace
Surface to 4000 MSL
Class D Airspace
2500 MSL
Class E Airspace
2500 AGL
Glass G airspace
Extends from ground to 700 or 1200 AGL
VFR for UAS for clous
500 ft below and 2000’ away horizonatlly
Anti-Authority
“Dont tell me what to do”
Impulsivity
“Do it quickly”
Inulnerability
“It wont happen to me”
Machoism
“I can do it-Ill show them”
Resignation
‘Whats the use?”
