101-12 Ceiling, IFR And Fog

Question 1

Definitions of METAR cloud coverage

Answer 1

CLR or SKC
FEW = 0 - 2/8
SCT = 3/8 - 4/8
BKN = 5/8-7/8
OVC = > 7/8

Question 2

Ceiling definition

Answer 2

Hieght above ground of the lowest cloud base or obscuring phenomena
BKN or OVC

Question 3

IFR & VFR Rules

Answer 3

LIFR = C < 500’ and/or V <1sm
IFR = C < 1000’ and/or V <3sm
MVFR = C 1000-3000’ and/or V 3-5sm
VFR = none or > 3000’ AND V > 5sm

Question 4

Radiation Fog

Answer 4

Terrestrial radiation
Flat, inland areas
Wind > 5kts will dissipate the fog

Question 5

Upslope Fog

Answer 5

Form from moist, stable air up slope

Question 6

Ice Fog

Answer 6

Radiation fog at less than or equal to -32 degrees C

Question 7

Advection Fog

Answer 7

Moist air moves over colder ground or water
Coastal areas
Dissipates when wind is greater than 15kts

Question 8

What is the definition of a surfaced-based obscuration ceiling?

Answer 8

Vertical visibility into a total surface-based obscuration