DWO Weather Assessment 2

Question 1

A rapidly falling barometer of more than 1 mb per hour over several hours most likely indicates:

Accepted Answer

An approaching storm system

Answer

A rapid pressure drop of more than 1 mb/hour sustained over several hours is a strong indicator that a storm system is approaching.

Question 2

On a weather map, isobars that are closely spaced together indicate:

Accepted Answer

Strong pressure gradient and high winds

Answer

Closely spaced isobars represent a steep pressure gradient, which produces strong winds in the area.

Question 3

What type of fog commonly forms when warm, moist air moves over a cold ocean current?

Accepted Answer

Advection fog

Answer

Advection fog forms when warm moist air is transported horizontally over a cooler sea surface and is cooled to its dew point.

Question 4

In the Northern Hemisphere, standing with the wind at your back, low pressure is located approximately:

Accepted Answer

To your left and slightly ahead

Answer

Buys Ballot's Law states that in the Northern Hemisphere, with the wind at your back, low pressure is to your left.

Question 5

A vessel officer observes a halo around the moon at night. This is most commonly associated with:

Accepted Answer

Approaching precipitation within 24-48 hours

Answer

A lunar or solar halo is caused by ice crystals in high cirrus clouds, which typically precede a warm front and incoming precipitation.

(DWO) Deck Watch Officer Practice Test