Weather Flashcards
Temp/Dew spread is significant when < ?
2 deg or less
1 deg or 0 deg can still be ok for local flying near Ocean airports (Victoria, Lhr)
Whereas, Super Dry air won’t get any weather except Gusty winds!
Flight watch frequency usa?
122.0
First contact full Callsign
…then only last ‘3’ of my n-number “25Q”
Will give weather and forecasts
When visibility is less than 4miles start thinking?
If there is Precipitation…then vis will be even less at higher altitude.
Fly around Snow Showers, like you would the bottom of CB in the summer.
D=V*T (<3nm is time divert)
3/current groundspeed *3600= Secs of vis required right now, Hit Stopwatch!
hrs/min/sec
What wind changes cause a DPS?
Loss of Headwind OR
Increase of a Tailwind
Both make a/c fall, go max power!
An overall change of windspeed of greater than 6kts per 1000’ means?
Produces Turbulence
What happens on clear, cool nights?
Ground cools faster than airmass; an inversion of temperature; expect some shear as you transition this area.
When is the aircraft no longer moving with the air?
When the wind changes faster than the aircraft’s mass can be accelerated or decelerated.
Which conditions provide the worst frontal windshears?
5hrs prior to a Warm fronts passage at altitudes below 5000’
What do ‘sharp’ edges on clouds indicate?
Moderate or Severe Turbulence
Which side of CB’s has windshear?
All sides!
Gust Front ahead
Downdraft underneath
What is the safe distance to remain from a CB?
15nm
Can’t out climb
Harder to deviate 100nm off course
Can barely outrun
Any encounters on ground or air will have severe consequences…
What do Surface winds of 30kts imply?
LLWS
What is Virga?
Precip that doesn’t hit the ground…a very bad sign!
What wind shift is present with all Frontal passage?
90-180 deg clockwise windshift!
What is my minimum G/S for an approach in variable wind conditions?
35kts, can be less in steady winds…
