#3

Question 1

Advection Fog causes

Answer 1

Low layer of warm air moves over cooler surface, wind velocity is required for formation

Question 2

Upslope Fog causes

Answer 2

Forms when moist, stable air is forced up a sloping land to where the air becomes saturated and condensation occurs, requires wind to form.

Question 3

Ice fog causes

Answer 3

Occurs in cold weather when air is below freezing and water vapor sublimates directly into ice crystals

Question 4

SIGMET Defined

Answer 4

Non Convective Weathers, to all aircrafts, reasons for SIGMET severe icing, servers or extreme turbulence, dust storms, sand storms, with less then 3 SM visibility or volcanic ash

Question 5

Convective SIGMET Defined

Answer 5

Valid for 2 hours, reasons for convective SIGMETs, severe thunderstorms, surface winds more then 50kts, Hail at surface 3/4 inches in diameter, tornadoes, embedded thunderstorms, lines of thunderstorms 60 NM long and affecting 40% of covering area. (Convective SIGMET implies severe turbulence, severe icing, or low level wind shear)

Question 6

Thunderstorms Defined

Answer 6

Most dangerous hazards to aircraft, three stages (towering, mature, dissipating), can have microbursts, stay 20 NM from thunderstorms

Question 7

Wind Shear defined

Answer 7

Rapid change in direction and speed of winds, associated with frontal systems and microbursts, FAA recommends add 1/2 gust factor to approach speed for wind shear

Question 8

Microbursts Defined

Answer 8

Rapidly descending column of air below a thunderstorm, can exceed 6000ft per minute, less then 2.5 NM in width with peak winds lasting less then 5 minutes

Question 9

Approach Speed Formula

Answer 9

1.3 x Vso

Question 10

AIRMET Defined

Answer 10

Issued for weather that can be hazardous to all aircraft but mainly applies to small aircraft, valid for 6 hours