Meteorology (shipboard forecasting) 1.
When someone says they know marine weather, this usually means that they know about a. All other choices b. Shipboard forecasting from natural signs of weather c. Something of the principles that cause weather d. Radio broadcast sources of weather data and how to interpret them 2. Which symbol in WX MAP represents a ridge of high pressure? a. 1 b. 2 c. 4 d. 8
3. When does the study of marine weather rank in the overall preparation for ocean voyaging? a. It is a nice luxury to know it, because it could keep me out of trouble in some cases or help me choose best route b. Right at the top. If I dont know about weather, I will eventually get into trouble. Guaranteed c. I must eventually learn the basics of marine weather because the Nav Rules require. I know it at least to the level of the ordinary practice of seamen d. Once I have a sound vessel and adequate crew to run it, and have mastered the skills of navigation, then marine weather becomes my primary concern
4. Which of the symbols in the WX MAP represents an occluded front? a. 2 b. 3 c. 5 d. 6
5. On a working copy of a weather (wx) map, a warm front is represented by what color? a. Red b. Blue c. Purple d. Alternating red and blue 6. What is the most important factor in the practical application of marine weather analysis? a. How fast is your ship b. Quality of shipboard instruments for verifying broadcast data c. Ability to read as much as possible from the conditions you observe d. Knowing the basics of weather, so you can make a sound interpretation of the broadcast 7. The coloring of an occluded front on a weather map is a/an a. purple line b. blue line c. dashed blue line d. alternate red and blue
8. The coloring of a front wave on a weather map is a/an a. black line b. blue line c. dashed blue line d. alternate red and blue 9. The coloring of a warm front on a weather map is a/an a. Red line b. blue line c. dashed blue line d. alternate red and blue 10. The coloring of a cold front on a weather map is a/an a. Red line b. blue line c. dashed blue line d. alternate red and blue 11. The coloring of a stationary front on a weather map is a/an a. Red line b. blue line c. dashed blue line d. alternate red and blue 12. In reading a weather (wx) map. Closely spaced pressure gradient lines would indicate a. high winds and sea in that area b. settled weather in that area c. calm in that area d. fog in that area
13. TRUE or FALSE: Meteorology is an exat science like thermodynamics or optics? a. True b. False c. Cannot be determine d. Doesnt matter
14. In most practical application of marine weather we are primarily concerned with a. Fog b. wind c. precipitation d. temperature 15. Which region in the map would the lowest pressure? a. S b. P c. R d. U
16. On the weather map, a large letter H means a. a high pressure with warm moist air and inclement weather b. horse latitude, with rough seas and strong winds c. high pressure area cool dry air and fair weather d. a heavy squall line near H 17. You see a dark cloud stretching clear across the horizon and moving towards you. What would these clouds indicate? a. A ridge b. A squall c. A cold front d. A warm front
18. Which clouds are most characteristic of warm fronts? a. Cumulus b. Cirrus c. Stratus d. All other choices
19. The presence of cumulus clouds implies a. still air b. rising air c. excess air d. sinking air
20. Clouds are classified according to their heights (low, middle, or high) and by their shapes (cirro, strato, or cumulo). Which of the following are middle height clouds? a. Cirrus b. Stratus c. Cumulus d. Altocumulus 21. A low uniform layer of cloud resembling fog, but not resting on the ground, is called a. cumulus b. nimbus c. stratus d. cirrus 22. The thin, whitish, high cloud composed of ice crystals, popularly known as mare tails a. cirrostratus b. nimbostratus c. cumulonimbus d. cirrocumulus 23. Clouds are classified according to their a. Size b. Location front c. Moisture content d. Altitude and how they were formed
24. High clouds composed of small white flakes or scaly globular masses are often banded together to form mackerel sky would be classified as a. cirrus b. altocumulus c. cirrocumulus d. cumulonimbus 25. If the sky was clear with the exception of a few cumulus clouds, it would indicate a. rain b. fair weather c. fog setting in d. hurricane weather 26. Which of the following cloud types is normally associated with thunderstorms? a. cirrus b. altocumulus c. cirrocumulus d. cumulonimbus 27. Uniform, grayish-white cloud sheets that cover large portion of the sky and are responsible for a large percentage of the precipitation in the temperate latitudes are called a. cirrus b. altocumulus c. altostratus d. cumulonimbus 28. A cloud of marked vertical development (often anvil-shaped) would be classified as a. cirrus b. altocumulus c. cirrocumulus d. cumulonimbus 29. What type of cloud is shown on the picture? a. Cumulonimbus b. Cumulus c. Stratus d. Cirrus
30. What type of cloud is shown on the picture?
a. b. c. d.
Cumulonimbus Altocumulus Stratus Cirrus
31. What a. b. c. d.
type of cloud is shown on the picture? Cumulonimbus Altocumulus Cumulus Cirrus
32. What would like be the earliest natural sign of an approaching deep Low? a. The onset of a new long low swell b. Barometer begins a slow steady drop a. First sign of cirrus in an otherwise clear sky b. Surface wind begins a slow steady shift in direction 33. All weather observations made by each weather station includes all EXCEPT? a. Barometric pressure and change in the last three hours b. Predicted weather for the next 12 hours c. Temperature d. Visibility 34. The beaufort scale is used to estimate a. Wind speed b. Wind direction c. barometric pressure d. percentage of cloud cover
35. The wind has increased from 15 knots to 20 knot in the pas 20 minutes. What seas would you expect over open ocean? a. Significant wave height of 4 feet b. Average wave height of 4 feet c. No sea changes will be apparent in just 20 minutes d. Essentially the same as they were, but choppier and with many whitecaps. 36. What information should be kept in the logbook to best help with weather analysis, forecast, and routing? a. COG, SOG and position from the GPS b. Compass course, knotmeter speed, log and time c. Barometer, wind, speed and direction, sea state, and cloud notes d. All other choices
BUY BALLOTS LAW (shipboard Forecasting)
1. According to Buy Ballots Law, with the wind at your back, the center of the pressure can be located a. to your left and slightly forward b. to your left and slightly backward c. to tour right and slightly forward d. to tour right and slightly backward
WIND BEHAVIOUR
2. In the Northern Hemisphere winds veering sharply to the west or northwest with increasing speed are indication that a a. a stationary front exist b. cold front has passed c. high pressure center has passed d. low pressure center is approaching
3. The probability of a sudden wind may be foretold by a. formation of cumulus clouds in the sky b. fast approaching line of dark clouds c. partly cloudy sky d. overcast sky 4. The wind direction around a low pressure area in the Northern hemisphere is a. counterclockwise and inward b. counterclockwise and outward c. clockwise and inward d. clockwise and outward
5. The wind direction around a low pressure area in the Southern hemisphere is a. counterclockwise and inward b. counterclockwise and outward c. clockwise and inward d. clockwise and outward 6.
