Weather 1 COPY Flashcards
Which cond~ions are favorable for the formation of a surface based temperature inversion?
Clear, cool nights with calm or light wind
How does the Frontal inversions occur?
when warn air spreads over
a layer of cooler air, or cooler air is forced under a layer of wanner air.
How does the Surface-based temperature inversions occur?
on clear, cool nights when the air close to the ground
is cooled by the lowering temperature of the ground
Pressure altitude 12,000 ft
True air temperature +50 °F
density altitude is?
PA + 120 x (OAT- Standard Temp) - DA
12000 + 120 (10 °C - (-9 °C) ) - 14280 feet
Density altitude calculation on E6-B
XXXX
In the Northern Hemisphere, the wind is deflected to the
right by Coriolis force
PGF
The Pressure Gradient Force
The Coriolis effect is defined ??
a moving object seems to veer toward the right in the Northern hemisphere and left in the Southern hemisphere.
Why does the wind have a tendency to flow parallel to the isobars above the friction level?
Coriolis force tends to counterbalance the horizontal pressure gradient.
While flying cross-country, in the Northen Hemisphere, you experience a continuous left
crosswind which is associated with a major wind system. This indicates that you
are flying toward an area of generally unfavorable weather conditions
While flying cross-country, in the Northen Hemisphere, you experierce a continuous left
crosswind which is associated with a major wind system. This indicates that you
are flying toward an area of generally unfavorable weather conditions
Low pressure systems are
normally associated with_______weather.
bad
no matter which direction you are flying (north, south, east, west), if you start to fly into a low pressure system
(you will have a _____ crosswind
left
A high-pressure area or ______ is an area of descending air
RIDGE
High-pressure systems are generally areas of _______ air
dry, descending
High-pressure systems are generally areas of _)______ air
dry, descending
air flows into a low- pressure area to replace rising air. This air usually
brings increasing ___________________
cloudiness and precipitation
Virga is best described as
streamers of precipitation trailing beneath clouds which evaporates before reaching the ground
water vapor is added into the atmosphere only by the
processes of __________________
evaporation and sublimation.
lce pellets encounter during flight normally are evidence that
a warm front is about to pass.
What is indicated if ice pellets are encountered at 8,000 feet?
Freezing rain at higher altitude.
What determines the structure or type of clouds which will form as a result of air being forced
to ascend?
Stability of air before lifting occurs
What are the 2 ways the clouds can form?
1) condensation of water vapor in rising currents of air,
2) by the evaporation of the lowest layer of fog
What is Unsaturated air?
the air contains the very less amount of water vapor.
