Meteorology and Weather Flashcards

What is the primary purpose of checking weather forecasts before departure?

Answer: To plan the voyage for safety and efficiency

Reviewing weather forecasts before departure allows mariners to plan routes that avoid hazardous conditions, ensuring the safety of the vessel and crew.

Wind speed is measured using which instrument?

Answer: Anemometer

An anemometer measures wind speed; the readings are often combined with a wind vane to provide both speed and direction.

What does a veering wind (clockwise shift) in the Northern Hemisphere generally indicate?

Answer: Improving weather as a high pressure system builds

A veering (clockwise) wind shift in the Northern Hemisphere typically accompanies the passage of a cold front or the building of a high-pressure system, often signaling improving conditions.

What is the recommended action when a vessel receives a severe thunderstorm warning?

Answer: Seek shelter in a protected anchorage or harbor if possible

When a severe thunderstorm warning is issued, the safest action is to seek a protected anchorage or harbor to avoid lightning, waterspouts, and high seas.

What is the dew point temperature?

Answer: The temperature at which air becomes saturated and condensation forms

The dew point is the temperature to which air must be cooled at constant pressure for water vapor to condense into dew or fog.

A vessel observing a sudden shift in wind direction and a rapid pressure drop should?

Answer: Prepare for severe weather and consider altering course

A sudden wind shift combined with rapid pressure drop are classic precursors to severe weather, requiring immediate preparation and possible course alteration for safety.