Weather 1 COPY Flashcards

1
Q

Which cond~ions are favorable for the formation of a surface based temperature inversion?

A

Clear, cool nights with calm or light wind

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2
Q

How does the Frontal inversions occur?

A

when warn air spreads over

a layer of cooler air, or cooler air is forced under a layer of wanner air.

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3
Q

How does the Surface-based temperature inversions occur?

A

on clear, cool nights when the air close to the ground

is cooled by the lowering temperature of the ground

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4
Q

Pressure altitude 12,000 ft
True air temperature +50 °F
density altitude is?

A

PA + 120 x (OAT- Standard Temp) - DA

12000 + 120 (10 °C - (-9 °C) ) - 14280 feet

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5
Q

Density altitude calculation on E6-B

A

XXXX

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6
Q

In the Northern Hemisphere, the wind is deflected to the

A

right by Coriolis force

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7
Q

PGF

A

The Pressure Gradient Force

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8
Q

The Coriolis effect is defined ??

A

a moving object seems to veer toward the right in the Northern hemisphere and left in the Southern hemisphere.

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9
Q

Why does the wind have a tendency to flow parallel to the isobars above the friction level?

A

Coriolis force tends to counterbalance the horizontal pressure gradient.

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10
Q

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

A

are flying toward an area of generally unfavorable weather conditions

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11
Q

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

A

are flying toward an area of generally unfavorable weather conditions

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12
Q

Low pressure systems are

normally associated with_______weather.

A

bad

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13
Q

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

A

left

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14
Q

A high-pressure area or ______ is an area of descending air

A

RIDGE

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15
Q

High-pressure systems are generally areas of _______ air

A

dry, descending

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16
Q

High-pressure systems are generally areas of _)______ air

A

dry, descending

17
Q

air flows into a low- pressure area to replace rising air. This air usually
brings increasing ___________________

A

cloudiness and precipitation

18
Q

Virga is best described as

A

streamers of precipitation trailing beneath clouds which evaporates before reaching the ground

19
Q

water vapor is added into the atmosphere only by the

processes of __________________

A

evaporation and sublimation.

20
Q

lce pellets encounter during flight normally are evidence that

A

a warm front is about to pass.

21
Q

What is indicated if ice pellets are encountered at 8,000 feet?

A

Freezing rain at higher altitude.

22
Q

What determines the structure or type of clouds which will form as a result of air being forced
to ascend?

A

Stability of air before lifting occurs

23
Q

What are the 2 ways the clouds can form?

A

1) condensation of water vapor in rising currents of air,

2) by the evaporation of the lowest layer of fog

24
Q

What is Unsaturated air?

A

the air contains the very less amount of water vapor.

25
Q

Unsaturated air in a
convective current cools at
dew point decreases at about

A

about 5.4° F (3.0° C) per 1,000 feet; dew point decreases at about 1 ° F (5/9° C).

Get closer 2.5

26
Q

KTUS 08004KT 4SM HZ 26/04 A2995 RMK RAE36
At approximately what altitude AGL should bases of convective type cumuliform clouds
be expected?

A

26-4: 22
22/2.5:8.8
8.8 X 1000 = 8800

27
Q

what cloud types include convective turbulence?

A

Towering cumulus clouds

28
Q

what cloud types include convective turbulence?

A

Towering cumulus clouds

29
Q

What is convection?

A

Convection is the circular motion that happens when warmer air or liquid — which has faster moving molecules, making it less dense — rises, while the cooler air or liquid drops down.

30
Q

The presence of standing lenticular altocumulus clouds is good indication of

A

very strong turbulence.

31
Q

characteristics of a cold air mass moving over a warm surface?

A

Cumuliform clouds, turbulence, and good visibility.