DWO Weather Assessment 4

Question 1

What is the primary purpose of a vessel's barograph on the bridge?

Accepted Answer

To provide a continuous record of atmospheric pressure changes over time

Answer

To measure sea water temperature continuously

Answer

To indicate wind direction automatically

Answer

To calculate true wind speed from apparent wind

Question 2

Steam fog (also called sea smoke) is most likely to form when:

Accepted Answer

Cold air flows over relatively warm water

Answer

Warm moist air flows over a cold ocean surface

Answer

Precipitation falls through a dry air layer

Answer

High pressure dominates with light winds at night

Question 3

A vessel receives a weather forecast indicating a STORM WARNING. What minimum sustained wind speed is expected?

Accepted Answer

48 knots

Answer

34 knots

Answer

64 knots

Answer

28 knots

Question 4

Which of the following best describes a 'cold front' in terms of movement and weather effects?

Accepted Answer

Cold air advancing and undercutting warm air, bringing brief intense precipitation

Answer

Warm air advancing over retreating cold air, bringing steady rain

Answer

Two equal air masses at rest with persistent drizzle

Answer

Cool air subsiding from aloft with clear skies

Question 5

What does 'veering' of the wind mean in the Northern Hemisphere?

Accepted Answer

Wind shifting in a clockwise direction

Answer

Wind shifting in a counterclockwise direction

Answer

Wind speed increasing by more than 10 knots

Answer

Wind direction becoming variable and uncertain

Question 6

During a tropical cyclone, the most dangerous semicircle for a vessel in the Northern Hemisphere is the:

Accepted Answer

Right (dangerous) semicircle

Answer

Left (navigable) semicircle

Answer

Forward quadrant of the left semicircle

Answer

Rear quadrant regardless of hemisphere

Question 7

What cloud sequence typically signals the approach of a warm front, in order from first sighted to last?

Accepted Answer

Cirrus → Cirrostratus → Altostratus → Nimbostratus

Answer

Cumulus → Stratus → Cirrus

Answer

Nimbostratus → Altostratus → Cirrus

Answer

Stratus → Altostratus → Cirrostratus → Cirrus