Weather 2 COPY Flashcards
Which are characteristics of a cold air mass moving over a warm surface?
Cumuliform clouds, turbulence, and good visibility.
Fog produced by frontal activity is a result of saturation due
evaporation of precipitation
Hazardous windshear is commonly encountered
in areas of temperature inversion and near thunderstorms.
low•l evel wind shear may occur when
there is a low•level temperature inversion with strong winds above the inversion
If a temperature inversion is encountered immediately after takeoff or during an approach to a
landing ,a potential hazardous exists due to
wind shear
Convective currents are most active on warm summer afternoons wheo winds are
light
What is indicated if ice pellets are encountered at 8,000 feet?
Freezing rain at higher altitude.
If clouds form as a result of very stable, moist air being forced to ascend a mountain slope, the
clouds will be
stratus type with little vertical development and little or no turbulence.
Changes in atmospheric stability are inversely related to what?
1) Temperature
(density) changes with height
2) If temperature lapse rates increase, then stability decreases.
Which would increase the stability of an air mass?
Cooling from below.
clouds types which include convective turbulence?
Towering cumulus clouds
hazardous weather that created by Cumulonimbus clouds are?
lightning, hail, tornadoes, gusty winds, and wind shear.
standing lenticular altocumulus clouds is a good indication of
very strong turbulence
How Standing lenticular altocumulus clouds are formed?
crests of waves created by barriers in the wind flow.
The formation of either predominantly strati form or predominantly cumuliform clouds is
dependent upon the
stability of the air being lifted
Which are characteristics of a cold air mass moving over a warm surface?
Cumuliform clouds, turbulence, and good visibility
Fog produced by frontal activity is a result of saturation due to
evaporation of precipitation
Features of Frontal fog
can become quite dense and 1) continue for an extended period of time.
2) extend over large areas,
3) is most commonly associated with
warm fronts, but can occur with other fronts as well.
What is an important characteristic of wind shear?
II can be present at any level and can exist in both a horizontal and vertical direction.
Why, low-level wind shear is especially hazardous
due to the proximity of an
aircraft to the ground.(greater than 25 knots).
What is Wind Shear?
a sudden, drastic change in wind speed and/or direction over a very small area.
Low-level wind shear is commonly associated with
1) passing frontal systems, 2) thunderstorms,
3) temperature inversions, 4) strong upper level winds
Hazardous windshear is commonly encountered
in areas of temperature inversion and near thunderstorms
low level wind shear may occur when
there is a low level temperature inversion with strong winds above the inversion.
If a temperature inversion is encountered immediately after takeoff or during an approach to a
landing ,a potential hazard exists due to
wind shear.
Convective currents are most active on warm summer afternoons when winds are
light
What is Convective turbulence is
turbulent vertical motions that result from convective currents and the subsequent rising and
sinking of air.
When flying low over hilly terrain, ridges, or mountain ranges, the greatest potential danger
from turbulent air currents will usually be encountered on the
downwind side when flying into the wind
During an approach, the most important and most easily recognized means of being alerted to
possible wind shear is monitoring the
Power and vertical velocity to remain on proper glidepath
Which situation would most likely result in freezing precipitation? Rain falling from air which has
a temperature of
more than 0 C into air having a temperature of 0 C or less.
where can you see the hailstones?
Hailstones may be encountered in clear al” several miles from a thunderstorm,
Which statement is true regarding squall lines
They are non frontal and often contain sever, steady-state thunderstorms
