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Which of these is the correct pressure sequence associated with a weather " cold front "?. In advance - steady ; during the passage - sudden rise ; in the rear - fall. None of these are correct. In advance - sudden fall; during the passage - sudden rise; in the rear - steady. In advance - fall ; during the passage - sudden rise ; in the rear - rise continues more slowly.

Tropical revolving storms are accompanied by ... very cold air and sometimes hail. heavy rain sometimes with thunder and lightning. slight wind and heavy rain. dense fog.

Which of these is the correct weather sequence associated with a "warm front"?. In advance - no rain; during the passage - continuous rain; in the rear - drizzle. In advance - drizzle; during the passage - no rain; in the rear - continuous rain. In advance - showers; during the passage - thunderstorms / in the rear - clear skies. In advance - continuous rain; during the passage - rain almost or completely stops; in the rear - mainly cloudy and slight rain.

Frontal depressions move in families, each depression following its predecessor but in ...... a slightly higher latitude. the same latitude. a slightly lower latitude. a much higher latitude.

The cause of ice accumulation on a ship is due to freezing of sea spray at a temperature below ...... 0 degrees C. - 2 degrees C. -5 degrees C. +2 degrees C.

On the Beaufort scale, hurricane force corresponds to wind ... force 8. force 12. force 10. force 14.

On the Beaufort scale, storm force corresponds to wind ...... force 10 and above. force 6 and above. force 8 and above. force 12 and above.

Wind force 10 correspond to wind speed of ... 56 - 63 knots. 48 - 55 knots. 28 - 33 knots. 34 - 40 knots.

An occluded depression tends to move ... fast. fast and irregularly. slowly and irregularly. slowly.

In what latitude do tropical revolving storms generally originate?. 0 to 25 degrees. 50 to 65 degrees. 25 to 35 degrees. 35 to 50 degrees.

If a meteorological depression has a large warm sector, it has a tendency to ... move fast. deepen. remain unchanged. weaken.

Which of these is the correct sequence of visibility associated with a weather "cold front"?. In advance - very good ; during the passage - very poor ; in the rear - moderate. In advance - usually poor ; during the passage - first bad than good ; in the rear - usually very good except in showers. In advance - very poor ; during the passage - bad ; in the rear - moderate. In advance - very good ; during the passage - moderate in showers ; at the rear - usually poor.

What is the common name for hurricanes, typhoons or cyclones?. Tropical revolving storms. Monsoons. Tropical depressions. Inter tropical convergence zones.

Which of these is the correct pressure sequence associated with a weather "warm front"?. In advance - sharply falling ; during the passage - rise and fall ; in the rear - slowly. In advance - steady fall ; during the passage - fall ceases ; in the rear - little change or slow fall. In advance - steady ; during the passage - steady fall ; in the rear - increase. In advance - increase ; during the passage - steady ; in the rear - decrease.

In a tropical revolving storm, "the eye" is a small central region of... no winds and heavy rain. comparatively light winds and little clouds. very strong winds and no clouds. comparatively strong winds and heavy clouds.

The eye of a tropical revolving storm is an area with light wind but with seas that are... very high and confused. very high from the East or West. very high from the North or South. moderate and confused.

Wind force 5 corresponds to a wind speed of .... 17 - 21 knots. 30 - 34 knots. 10 - 14 knots. 25 - 29 knots.

South Westerlies are the general surface wind in which of the following latitudes?. 0 - 30 degrees. 30 - 40 degrees. 60 - 90 degrees. 40 - 60 degrees.

Fast moving high clouds are an indication of ... good weather to come. unchanged weather. bad weather to come. rainy weather to come.

A falling barometer is an indication of ... rainy weather to come. bad weather to come. no change in weather. good weather to come.

Which of these is the correct sequence of weather associated with a "cold front"?. In advance - clear skies ; during the passage - thunderstorms, often with hail ; in the rear - steady drizzle with cloudy skies. In advance - no rain ; during the passage - moderate rain ; in the rear - heavy rain. In advance - usually some rain and perhaps thunder ; during the passage - rain, often heavy ; in the rear - heavy rain for a short period than fair . In advance - heavy rain ; during the passage - no rain ; in the rear - no rain.

Which of these are "high clouds"?. Altocumulus, altostratus. Cumulonimbus. Cirrus, cirrocumulus, cirrostratus. Nimbostratus, stratus, stratocumulus.

The direction of the centre of a storm may be found by Buys Ballot's law, namely face the wind and .... the center of the storm will be ahead about a point to the right. the centre of the storm is to your left if you are in Northern hemisphere and to your right if you are in Southern hemisphere. in the Northern hemisphere the centre of the storm will bear 8 to 12 points to the right. the center of the storm will be right behind you about a point on your left.

In meteorology, isotherms are lines joining places having the same ... humidity. temperature. iceberg density. pressure.

You are 10 to 60 nautical miles away from the centre of a tropical revolving storm. What barometric changes would you expect?. No change. Rapid Increase. Rapid fall. Slight Increase.

Which of these are "low clouds"?. Megastratus. Nimbostratus, stratus, stratocumulus. Altocumulus, altostratus. Cirrus, cirrocumulus, cirrostratus.

What weather phenomenon can cause a reduction of radar range due to attenuation?. Rough seas. Rain & snow. Mist. Fog.

In meteorology, isobars are lines joining places having the same ...... iceberg density. pressure. humidity. temperature.

Steaming South at 10 knots, you estimate the wind speed from the surface as 15 knots. Smoke from the funnel is going away to port directly to abeam. What is the approximate true direction of the wind?. WNW. NNW. SSW. WSW.

Referring to the weather map "Metmap 4", if you were at position 5, you would expect... strong NE winds, showers. light NE winds, good visibility. strong SW winds, showers. light SW winds, good visibility.

Referring to the weather map "Metmap 2" for 1200 May 15th, the pressure system affecting position C is a... depression. col. ridge. frontal trough.

At what temperatures can ice start to form on a vessel's superstructure?. 0°C. -2°C. -4°C. 2°C.

Which type of cloud, from those listed, has a low base but great vertical height?. Cumulonimbus. Stratocumulus. Cirrus. Cirrocumulus.

Referring to the weather map "Metmap 4", the line at position 1 is called... the cold front. the cold sector. the warm sector. the warm front.

What speed could gusts of wind reach in a Force 8 gale?. Over 24 knots. Over 14 knots. Over 34 knots. Over 43 knots.

Referring to the weather map "Metmap 3", estimate the pressure gradient between positions A and B. Use the distance scale on the map. 10 mb in 100 miles. 20 mb in 100 miles. 16 mb in 100 miles. 14 mb in 100 miles.

Referring to the weather map "Metmap 2" for 1200 May 15th, Westerly winds are being experienced in which of the following?. Position C. Position A. Position D. Position F.

With which type of cloud is continuous rain usually associated?. Stratocumulus. Altostratus. Nimbostratus. Altocumulus.

During which month do most tropical storms form in the northern hemisphere?. December. September. August. May.

In the northern hemisphere, which direction will the wind be from just before a warm front arrives?. SSW. WNW. SSE. ESE.

Referring to the weather map "Metmap 4", a typical value for the low pressure would be... 1010 mb. 980 mb. 960 mb. 1005 mb.

Referring to the weather map "Metmap 4", a typical value for the high pressure would be... 1015 mb. 1010 mb. 1025 mb. 1005 mb.

Cumulus clouds are... thin and often causing a circular halo around the Sun or Moon. elongated bands of cloud extending across the sky. thick layered clouds covering the whole sky. flat based clouds which grow upwards and frequently have "cauliflower" tops.

What wind speeds are likely when a weather forecast predicts an imminent Force 8 gale?. Over 14 knots. Over 24 knots. Over 10 knots. Over 34 knots.

On a synoptic weather chart, what level of air pressure would be represented by the figure 113?. 1130.0 mb. 1011.3 mb. 11.30 mb. 113.0 mb.

In which direction does the Coriolis force deflect winds in the southern hemisphere?. To the right. To the left. Anticlockwise. Clockwise.

A typical value for a high pressure centre in the North Atlantic is... 990mb. 1030mb. 1050mb. 1010mb.

What is the name given to an elongated area of low pressure extending outwards from a depression?. A col. A ridge. A trough. A wedge.

Referring to the weather map "Metmap 3", estimate the pressure at position C. 1021 mb. 1019 mb. 1020 mb. 1018 mb.

Which one of these is most characteristic of cold air?. Its fast-moving nature. The way it often remains stationary. Its lightness. Its denseness.

When a marine thermometer is used to take air temperatures, it should be hung... in the wheelhouse. in a sheltered position to leeward. exposed to the weather. in a screen sited to windward.

At what altitude do altostratus clouds generally form?. 4500 - 11000m. 2000 - 4500m. above 11000m. 500 - 2000m.

In the northern hemisphere, which direction will the wind normally be from just before a cold front arrives?. SSE. ESE. WNW. SSW.

Referring to the weather map "Metmap 3", in which of the following positions will the wind be lightest?. Position 1. Position 4. Position 5. Position 3.

Tropical maritime air is usually: Cold, wet and stable. Cold, dry and stable. Warm, moist and unstable. Warm, dry and stable.

Referring to the weather map "Metmap 3", estimate the pressure gradient between positions C and D. Use the distance scale on the map. 4 mb in 100 miles. 6 mb in 100 miles. 5 mb in 100 miles. 3 mb in 100 miles.

What is normally the safest angle for a vessel to steer into steep waves?. 25°. 85°. 60°. 45°.

In the northern hemisphere, which is the most dangerous part of a storm in relation to the direction in which it is moving?. Its tail. Its eye. Its right hand side. Its left hand side.

A barograph is an instrument which records continuous... pressure and pressure tendency. pressure and temperature. temperature and dewpoint. temperature and humidity.

What corrections must be applied to a mercury barometer?. Height, temperature and instrument error. Height and instrument error. Temperature, height, and latitude. No corrections are necessary.

What is the most important way of using air pressure measurements to predict bad weather is coming?. Noticing a steady, rapid fall in air pressure. Noticing a steady rise in air pressure. Noticing the air pressure level hasn’t changed by more than 1 mb in 24 hours. Noticing when the pressure reading hits 1000 mb.

An anticyclone is an area of.... high pressure, descending air, and light winds. high pressure, ascending air, and strong winds. high pressure, ascending air, and light winds. low pressure, descending air, and light winds.

The visual range corresponding to the term "moderate visibility" used in weather bulletins. 2 to 5 nautical miles. 1 to 2 nautical miles. 0.5 to 1 nautical mile. 5 to 7 nautical miles.

Which of the following is NOT true with regard to a summer anticyclone?. Winds are generally light. Precipitation, if it occurs, is likely to be light drizzle. Winds circulate anticlockwise in the Northern hemisphere. In coastal areas, sea breezes may occur by day.

If you see the term 'falling quickly' in a weather forecast, what does this mean the air pressure has done?. It has fallen by between 6 - 8 mb in the last three hours. It has fallen by between 0.1 - 1.5 mb in the last three hours. It has fallen by between 3.6 - 6 mb in the last three hours. It has fallen by between 1.5 - 3.6 mb in the last three hours.

Above what speed does a tropical depression have to travel to become classed as a tropical storm?. 55 kph. 74 kph. 83 kph. 62 kph.

Which of those listed is NOT classified as precipitation?. Hail. Snow. Drizzle. Ice.

From those listed, which is the highest cloud?. Stratus. Altocumulus. Cumulus. Cirrus.

If you are facing into the wind in the southern hemisphere, where would an area of low pressure lie?. Behind you. To your right. To your left. In front of you.

Which type of cloud is associated with thunderstorms?. Stratus. Altostratus. Cumulonimbus. Cirrus.

The three forms in which water can exist in the atmosphere are as a solid, a liquid and... a gas. water droplets. clouds. ice.

Which of these is not a meteorological classification of an air mass?. Polar continental. Tropical maritime. Tropical continental. Equatorial maritime.

Referring to the weather map "Metmap 2" for 1200 May 15th, winds at position A will be forecast as... light, variable. cyclonic. Moderate, SW. light NE.

In a weather forecast what wave height is indicated by the term 'moderate sea'?. 2.5 - 4m. 1.25 - 2.5m. 4 - 6m. 0.5 - 1.25m.

Referring to the weather map "Metmap 4", the area at position 3 is called. the cold front. the warm sector. the cold sector. the warm front.

You observe a strong breeze of 25 knots accompanied by large waves with white foam crests and some spray. What Force on the Beaufort scale would this be rated at?. 3.6. 1.2. 4.8. 2.4.

Which is the peak month for hurricanes in the northern hemisphere?. August. September. June. May.

What does it mean when the barometer shows air pressure to be rising?. Good weather is on the way. Rising seas imminent. Snow may be about to fall. Bad weather is on the way.

Referring to the weather map "Metmap 2" for 1200 May 15th, what is the predominant weather system over the UK at 1200 June 26th?. A col. An anticyclone. A ridge. A ridge.

What is normally the air pressure at sea level?. 13 mb. 1013 mb. 103 mb. 1310 mb.

In temperate latitudes, an air temperature of 25 degrees Celsius represents.... a hot summer's day. a cold winter's day. a warm summer's day. a cool winter's day.

Referring to the weather map "Metmap 3", estimate the wind direction at position 3. NNE. SSW. NW. Variable.

The temperature of the wet bulb thermometer falls according to the rate of... relative humidity. dew point. evaporation. condensation.

What is the minimum sea water temperature necessary for a hurricane to develop?. 37°. 7°. 17°. 26°.

Referring to the weather map "Metmap 3", the forecast states "the low pressure system to the NW of the British Isles is moving slowly SE." How would you expect the wind to change at position X?. To NW, remain steady. To ESE, decrease in strength. To NE, increase to 35 knots. To WSW, increase to 35 knots.

What distance must visibility be reduced to before water vapour is classed as fog?. 1500m. 2 km. 1000m. 500m.

In which direction do jet streams normally travel?. East to west. South to north. West to east. North to south.

What is 'ice blink'?. Small lumps of ice moving together. Temporary damage to the eyes caused by looking for too long at ice. A glare on the horizon perhaps indicating ice ahead. The icing up of a vessel's superstructure.

Which of these pressures would be described as "average" in temperate latitudes?. 1020mb. 1000mb. 1010mb. 990mb.

Referring to the weather map "Metmap 2" for 1200 May 15th, on passage up the English Channel, a vessel will probably experience... Continuous rain. thunderstorms. showers. fog or poor visibility.

Referring to the weather map "Metmap 3", what is the forecast wind direction and strength at position Z?. NE force 3 to 4. SW force 3 to 4. SW 35 knots. NE 35 knots.

What is a growler?. An unexpected large wave. A small iceberg. An instrument for measuring sound distance in fog. A Canadian term for a hurricane.

Referring to the weather map "Metmap 4", if you were at position 1, you would expect... thunderstorms now, becoming brighter and then showers. low clouds and rain, but improving over the next few hours. fine weather at present, but deteriorating. light winds, clear skies, but rain and stronger winds expected.

In the Beaufort weather notation, what is the meaning of the symbol RR?. Continuous heavy rain. Continuous rain. Rain. Heavy rain.

An isallobar is... a line on a weather map through positions having the same atmospheric pressure. a method of measuring the pressure of the atmosphere. a line on a weather map through positions having the same pressure tendency. a method used by meteorologists to forecast the weather.

Arctic air is usually: Freezing and sharp. Cold and dry. Cold and wet. Temperate and wet.

The most accurate sea surface temperature would be obtained from a.... water sample obtained in an insulated bucket. water sample obtained in a metal bucket. thermometer in the engine room intake pipe. thermometer lowered overside in a bucket.

What do tightly spaced isobars indicate?. Strong winds. Occasional gusts of wind. No wind at all. Light winds.

Referring to the weather map "Metmap 1" for 0700 July 4th, identify the predominant pressure system over the UK. A col. A trough. A depression. A secondary depression.

Referring to the weather map "Metmap 2" for 1200 May 15th, at position D, the winds can be expected to... veer Westerly and strengthen. be affected by sea breezes. back Easterly and weaken. veer Easterly and strengthen.

What does 'soon' mean in a weather forecast?. Within 12 -16 hours of the warning being given. Within 6 hours of the warning being given. Within 6 -12 hours of the warning being given. Within 16 - 24 hours of the warning being given.

How does a current flowing in the same direction as the wind affect the sea wave length and height?. It increases wave length and height. It decreases wave length and wave height. It decreases wave length and increases wave height. It increases wave length, and decreases wave height.

In the Northern hemisphere, the wind at sea level rotates around a depression in... an anticlockwise direction at a small angle to the isobars inwards towards the centre. a clockwise direction parallel to the isobars. a clockwise direction at a small angle to the isobars outwards away from the centre. an anticlockwise direction parallel to the isobars.

What is the biggest cause of high waves forming?. Latitude. Depth of sea. Wind. Distance from nearest land.

Buys Ballot's Law says that if a seafarer faces the wind in the southern hemisphere then the area of low pressure will be: Directly ahead. Directly behind. To the left. To the right.

An isobar is... a method of measuring the pressure of the atmosphere. a line on a weather map through positions having the same atmospheric pressure. a method used by meteorologists to forecast the weather. a line on a weather map through positions having the same pressure gradient.

After allowing for latitude daytime variation, what sort of fall in air pressure might indicate an approaching storm?. 3 mb in 24 hours. 3 mb in three hours. 1 mb in one hour. 1 mb in three hours.

Referring to the weather map "Metmap 2" for 1200 May 15th, the predominant weather system at position G is... a col. a deep depression. a weak low. a ridge.

Referring to the weather map "Metmap 1" for 0700 July 4th, what is the pressure system over the UK most likely do over the next 12 hours?. Remain stationary. Move eastwards. Move northwards. Move southwards.

Referring to the weather map "Metmap 4", the line at position 2 is called. the warm sector. the cold sector. the cold front. the warm front.

Referring to the weather map "Metmap 1" for 0700 July 4th, if you are on passage through the Dover Straits, the wind can be expected to... Back NW. Veer SW. Veer NW. Back SW.

Referring to the weather map "Metmap 2" for 1200 May 15th, the pressure system over the UK will probably, in the next 12 hours...... remain stationary. move steadily Northwards. move rapidly Eastwards. move steadily Westwards.

Showery precipitation is most likely to be produced by... nimbostratus clouds. cumulus or cumulonimbus clouds. stratus clouds. cirrus type clouds.

Referring to the weather map "Metmap 3", in which of the following positions will the wind be strongest?. Position 4. Position 2. Position 1. Position 5.

Sea fog is likely to form when the wind changes direction to bring air from a... cold land over a warm sea. warm land over a cold area of sea. warm area of sea over a cold land. cold area of sea over a warm area of sea.

With which type of cloud is hail usually associated?. Altocumulus. Cirrus. Cumulonimbus. Stratus.

Referring to the weather map "Metmap 4", if you were at position 2, you would expect... showers followed by thunderstorms. the wind to back to Easterly and become lighter. poor visibility and continuous rain for a while. the wind to veer to the West, visibility to improve.

What level of visibility does 'poor' indicate in a weather forecast?. Between 1000 - 2000m. Between 5 - 8 nautical miles. Between 2 - 5 nautical miles. Less than 1000m.

How reliable are official wave forecasts considered to be?. 80%. 50%. Almost 100%. 70%.

What is an isobar?. A contour line of constant air pressure. A contour line of constant visibility. A contour line of constant altitude. A contour line of constant wind speed.

Referring to the weather map "Metmap 4", the line at position 4 is probably... a frontal trough. a ridge of higher pressure. the likely direction of movement of the low system. the trailing part of the cold front of a previous low.

Where, in a warm sector depression, are fog patches and light drizzle most likely to occur?. On passage of the cold front. In the side of the depression away from the fronts. After the passage of the cold front. In the warm sector of the depression.

Which of these cities is one of the three key weather information collecting centres?. Cape Town. Melbourne. Tokyo. London.

If the atmosphere contains less water vapour than it is capable of holding at that temperature, it is said to be... dry. saturated. unsaturated. wet.

Sea waves will increase in height in certain conditions. From those listed, which is NOT one of those conditions?. When they approach a coastline. When they travel with a current. When they travel against a current. When they come into shallower water.

A depression is formed when: Warm, damp air meets cold, dry air. Two masses of tropical continental air meet. Any two air masses meet. Polar continental air meets polar sea air.

On this weather routeing chart, what does the upper figure indicate?. None of the other options. The percentage frequency of variables winds. The number of observations. The number of observed calms.

On this weather routeing chart, what is the wind speed indicated by the arrow?. 7 kts. 5 kts. 3 kts. 4 kts.

On this weather routeing chart, what is indicated?. Coast radio station providing range and bearing from stations on request. Radio calling in point, way or reporting point showing direction of vessels movement. Aeronautical radio beacon. Ramark.

What is rain accompanied by snow called?. Hail. Snow flakes. Ice pellets. Sleet.

On this weather routeing chart, what does this figure indicate?. Power transmission line. Pipeline. Overhead transporter. Telegraph line.

What is the quantity of water vapour present in the atmosphere called?. Humidity. Relative humidity. Dew point. Absolute humidity.

On weather routeing charts how are iceberg limits presented?. letter c. letter d. letter b. letter a.

On this weather routeing chart, what does this figure indicate?. Group quick. Single Occulting. Composite group flashing. Single flashing.

Assuming a forecast wind of say, 30 kts, with the maximum wind duration and maximum fetch, what would be the value of the significant wave height?. 3. 3.9. 4.9. 4.

What weather conditions are likely to result from the movement of warm air mass over a relatively colder sea surface?. Rain. Fog. Squalls. Trough.

On this weather routeing chart, what does this figure indicate?. Breakers. Overfalls and tide-rips. Kelp. Eddies.

A sudden rising strong wind, or sudden increase of wind usually followed immediately by a shower of rain or snow is called a ...... squall. storm. cyclone. tropical cyclone.

Meteorology - what does the figure indicate?. Cold front. Warm occlusion. Warm front. Cold occlusion.

In which area will the isobars be spaced closest, given the wind speeds indicated?. 40kts. 20kts. 30kts. 10kts.

A squall line of sharp changes of wind, is very often associated with ...... cold front. warm front. occluded front. warn front.

Which of these atmospheric layers is closest to the earth?. Stratosphere. Mesosphere. Ionosphere. Troposphere.

What is water content of the atmosphere (usually expressed as a percentage) known as?. Humidity. Mist. Dew. Fog.

In what direction does the wind blow around a cyclonic storm in the northern hemisphere?. Towards the pole. Clockwise. Towards the equator. Anti-clockwise.

If the distance between two consecutive isobars (drawn at intervals of 4mb) is found to be 100 n.m. and the latitude is 50 deg, what is the geostrophic wind speed?. 15 kts. 30 kts. 120 kts. 60 kts.

If an observer is facing the wind in the northern hemisphere, where does the low pressure. To the right. To the left. Ahead. Behind.

On this weather routeing chart, what does the lower figure represent?. The percentage frequency of currents having a rate of less than ½ knot. The mean resultant. The strongest current experienced. The number. of observations.

What is the instrument used for measuring humidity of the atmosphere called?. Barometer. Psychrometer. Humidifier. Hydrometer.

What does this indicate on a wether map?. Cold front. Warm front. Occluded front. Stationary front.

When visibility is 1km or less, it is known as ...... haze. mist. none of the other options. fog.

What instrument is used for measuring the velocity of the wind?. Anemometer. Barometer. Tachometer. Hydrometer.

What type of clouds are shown in the picture?. Stratus. Cumulus. Stratocumulus. Cirrus.