Weather

Question 1

Stable Air

Answer 1

Stratoform clouds, smooth air, poor visibility, and steady precipitation.

Question 2

unstable Air

Answer 2

Cumuliform Clouds, more turbulence, showery precipitation, good visibility.

Question 3

what are windshears

Answer 3

sudden change in windspeed/direction over a short distance.

Question 4

Mountainwave wind

Answer 4

Air is pushed up a mountain, meets inversion, and is redirected toward the ground.

Question 5

isobars close together

Answer 5

indicates strong wind

Question 6

standard conditions

Answer 6

29.92 In. mercury and 15 Degrees celsius. Temp decrease by 2 degrees for every 1000 ft gained.

Question 7

how do clouds form

Answer 7

air condenses into visible moisture. meeting point of dewpoint and temp.

Question 8

thunderstorms

Answer 8

form with rising force, unstable air, sufficient water vapor.

Question 9

t-storm stages

Answer 9

cumulus, mature, dissapating.

Question 10

microbursts

Answer 10

localized column of sinking air caused by evaporating air from precipitation.

Question 11

how does icing form

Answer 11

freezing conditions and visable moisture

Question 12

types of icing

Answer 12

clear ice (heavy, glossy) Rime (rough, milky) Mixed (combination of the two)

Question 13

types of fog

Answer 13

Radiation (ground cools air), Advection (warm air moves over cool ground [water]) Frontal (warm air runs over cool front), upslope (warm air hits mountain and cools as it rises), Steam (evaporation creates fog)

Question 14

personal weather minimums

Answer 14

No more than gusting 20 knots, no less than 5 miles visibility.

Question 15

how could you get weather info in flight?

Answer 15

call flight service station,
(122.2, 122.4, 122.6) AWOS/ATIS, foreflight, ADSB.

Question 16

How long is a TAF valid?

Answer 16

Check start/end times on forecast

Question 17

Winds aloft 9900?

Answer 17

Light and variable

Question 18

How often are convective sigmets issued?

Answer 18

Every hour

Question 19

How do low pressure systems move?

Answer 19

Inward, Upward, and Counterclockwise

Question 20

How do high pressure systems move?

Answer 20

Outward, downward, and clockwise

Question 21

What is a trough?

Answer 21

And elongated area of relatively low pressure

Question 22

What is a ridge?

Answer 22

Elongated area of relatively high pressure

Question 23

What is an isobar?

Answer 23

Isobars are lines on a chart that connect areas of identical or constant barometric pressure

Question 24

What causes winds to flow parallel to isobars

Answer 24

Coriolis effect

Question 25

Why don’t surface winds generally flow parallel to isobars

Answer 25

Surface friction

Question 26

What causes wind shears to occur

Answer 26

Low level temperature inversions, frontal zone of thunderstorms, clear air turbulence at at high levels

Question 27

Convective sigmets

Answer 27

-Issued hourly
-thunderstorms, extreme icing, low level wind shears
-surface winds >50kts
->=3/4” hail

Question 28

Sigmet

Answer 28

Non-convective potentially hazardous weather. 4-hour maximum period
Severe icing
Ash
Dust storms
Clear
Air
Turbulence

Question 29

AIRMET

Answer 29

Significant weather phenomenon lower that sigmet. Given every 6 hours.

Question 30

Types of airmet

Answer 30

Sierra: IFR and mountain obscuration
Tango: Turbulence and winds >30 kts
Zulu: Icing conditions

Question 31

IFR conditions?

Answer 31

Ceiling 500 to less than 1,000 feet and/or visibility <3 mi

Question 32

Marginal VFR

Answer 32

Ceiling 1,000 to 3,000 ft. Visibility 3-5 miles

Question 33

VFR

Answer 33

Ceiling >3,000 ft, visibility >5 miles