Weather Hazards

Question 1

Four conditions necessary for the formation of fog

Answer 1

small temperature/dewpoint spread
condensation nuclei
light surface wind
warm air above cooling land surface

Question 2

What are the dissipation factors of fog?

Answer 2

Heating
Strong wind
Greenhouse effect/overcast sky

Question 3

What type of cooling factors causes radiation fog to form?

Answer 3

Radiation cooling

Question 4

Describe the formation and typical location of precipitation induced fog?

Answer 4

created as rain falls through a frontal inversion and saturates the cooler air below. It is typically found ahead of a warm front or behind a cold front

Question 5

The 2400L forecast report (TAF) for your destination airport predicts the sky CLR, wind at 4 knots, temp of 17 degrees, and a dew point of 15 degrees. You will arrive just after midnight. What METAR weather coding would you expect to encounter?

Answer 5

FG

Question 6

Assuming same conditions exist, except the forecast wind for 2400L was stronger–12-15kts. No water near by. What kind of weather would you expect and why?

Answer 6

Clear skies. Strong wind would tend to prevent or dissipate any fog.

Question 7

Your DEC mission is taking you to Tyndall along Florida Coast. The ground is cold. Warm, moist air is flowing inland (3-9 kts) from Gulf of Mexico. You would expect_____ fog to form, possibly covering a (large/small) area.

Answer 7

Advection

large area

Question 8

Moist, stable air is being forced up an incline, expanding and cooling as it is lifted. What type of fog?

Answer 8

upslope fog

Question 9

Fog has formed during the late evening hours. Before sunrise, a thick overcast layer of clouds moves in over the fog. What effect will this have on the dissipation of this fog?

Answer 9

OVC cloud layer slows dissipation of fog

Question 10

What type of icing is described as small supercooled water droplets in temperatures -8 to -10 degrees and stratus clouds?

Answer 10

Rime ice

Question 11

Clear icing will typically occur in cumulus clouds where supercooled water droplets are (larger/smaller) than those in stratiform clouds.

Answer 11

larger

Question 12

What intensity of icing would require immediate diversion from the affected altitudes?

Answer 12

severe

Question 13

Where is common frontal location to find freezing rain (during the winter weather months)?

Answer 13

warm front

Question 14

In addition to being a hazard to vision by covering windshields, ice can cause a loss of vital airspeed readings by covering the______

Answer 14

pitot tube

Question 15

Factors needed for thunderstorm to form

Answer 15

Unstable air
small temperature/dewpoint spread
lifting action

Question 16

What type of frontal thunderstorm would match the definition “a severe line of thunderstorms that form ahead of a fast moving cold front?”

Answer 16

squall line front

Question 17

Summertime thunderstorm, forms everyday for the past week around 3 pm. What type is forming?

Answer 17

Air mass thunderstorm

Question 18

The windward side of the mountain range has vertical clouds developing into a thunderstorm. What type of thunderstorm is forming?

Answer 18

Orographic

Question 19

3 stages of a thunderstorm in order

Answer 19

Cumulus
mature
dissipating

Question 20

Most severe weather would occur in which stage of a thunderstorm?

Answer 20

Mature

Question 21

How do you know the cumulus stage has ended and the mature stage has begun?

Answer 21

precipitation and down drafts are descending from the cloud

Question 22

Updrafts are only found in the ____ stage of the development of a thunderstorm?

Answer 22

cumulus

Question 23

The category of turbulence on the OWS Turbulence chart is set for what category of aircraft?

Answer 23

Cat II

Question 24

A microburst occurring in the heavy rain shaft of a thunderstorm would be classified as a (wet/dry) microburst.

Answer 24

wet

Question 25

A microburst with virga from under vertical clouds would be classified as a (wet/dry) microburst.

Answer 25

dry

Question 26

Best conditions for dry microburst at KOZR

Answer 26

CU clouds; 14:00 CST, July

Question 27

High DA means what type of aircraft performance…

Answer 27

performance will be worse because a DA of 2031’ at KOZR indicates less air density

Question 28

How does relative humidity affect aircraft performance?

Answer 28

Low RH indicates a small percentage of moisture in the air, fewer clouds, and better aircraft performance.