Modulo 1 - 12

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 - fall; during the passage-sudden rise ; in the rear - rise continues more slowly. In advance - sudden fall ; during the passage - sudden rise; in the rear, steady.

Tropical revolving storms are a accompanied by .... Heavy rain someties with thunder and lightning. Dense fog. Slight wind and heavy rain. Very cold air and sometimes.

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

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. - 2 degrees C. - 5 degrees C.

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

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

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

An occluded depression tends to move .... Slowly and irregularly. Fast and irregularly. Fast. Slowly.

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

If a meteorological depression has a large warm sector, it has a tendency to ... Weaken. Remain uncharged. Deepen. Moce fast.

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

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

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

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

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

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

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

Fast moving high clouds are an indication of ... Bad weather to come. Good weather to come. Rainy weather to come. Unchanged weather.

A falling barometer is an indication of ... Good weather to come. Bad weather to come. No change in weather. Rainy weather to come.

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

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

The direction of the centre of a storm may be found by Buys Ballot's law, namely face the wind and ... The centre of the storm is to your left if you are in Northern hermisphere and to your right if you are Southern hemisphere. In the Northern hemisphere the centre of the storm will bear 8 to 12 points to the right. T he center of the storn will be ahead about a point 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... Pressure. Humidity. Temperature. Iceberg density.

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

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

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

In meteorology, isobars are lines joining place having the same.... Pressure. Temperature. Humidity. Iceberg density.

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 SW winds, showers. Strong NE winds, showers. Light SW winds, good visibility. Light NE winds, good visibility.

Referring to the weather map "Metmap 2" for 1200 May 15 th , the pressure system affecting position C is a ... Ridge. Col. Frontal trough. Depression.

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

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

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

What speed could gusts of wind reach is a Force 8 gale ?. Over 14 knots. Over 24 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. 14 mb in 100 miles. 16 mb in 100 miles. 20 mb in 100 miles.

Referring to the weather map " Metmap2" for 1200 May 15th , Westerly winds are being experienced in which of the following ?. Position A. Position C. Position D. Position F.

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

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

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

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

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

Cumulus clouds are ... Thick layered clouds covering the whole sky. Flat based cloudes which grow upwards and frequently have "cauliflower" tops. Thin and often causing a circular halo around the Sun or Moon. Elongated bands of cloud extending across the sky.

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

On a synoptic werather chart, what level of air pressure would be represented by the figure 113 ?. 11.30 mb. 113. 0 mb. 1011.3 mb. 1130. 0 mb.

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

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

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

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

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

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?. 500 - 2000 m. 2000 . 4500 m. 4500- 11000 m. Above 11000 m.

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

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

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

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

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

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

A barograph is an instrument which records continuos ... Temperature and humidity. Temeperature and dewpoint. Pressure and pressure tendency. Pressure and temperature.

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

What is the most important way of using air pressure measurements to predict bad weather is coming?. Noticing when the pressure reading hits 1000 mb. 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.

An anticyclone is an area of ... High pressure, descending air, and light winds. High pressure, asceding 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 is .... 1 to 2 nautical miles. 0.5 to 1 nautical mile. 5 to 7 nautical miles. 2 to 5 nautical miles.

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

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 0.1 - 1.5 mb in th elast three hours. It has fallen by between 1.5 - 3.6 mb in the last three hours. It has fallen by between 3.6 - 6 mb in the last three hours. Its has fallen by betwwen 6 - 8 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. 62 kph. 74 kph. 83 kph.

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

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

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

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

The three forms in which water can exist in the atmosphere are as a solid, a liquid and... A gas. Ice. Water droplets. Clouds.

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

Referring to th eweather map"Metmap 2" for 1200 May 15th , winds at position A will be forecast as... Light, variable. Moderate; SW. Light NE. Cyclonic.

In a weather forecst what wave height is indicated by the term "moderate sea". 0.5. cdd.

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

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

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

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

Referring to weather map "Metmap2" for 120 May 15th, what is the predominant weather system over the UK at 1200 June 26 th?. A trough. A col. An anticyclone. A ridge.

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

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

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

The temperature of the wet bulb thermometer falls according to the rate of .... Relative humidity. Condensation. Evapporation. Dew point.

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

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

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

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

What is " ice blink"?. 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. Small lumps of ice moving together.

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

Referring to the weather map "Metmap 2 " for 1200 May 15 th , on passage up the English Channel, a vessel will probably experience ... Thunderstorms. Continuos rain. Showers. Fog or poor visibility.

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

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

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

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

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

Artic air is usually. Cold and dry. Cold and wet. Temperate and wet. Freezing and sharp.

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

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

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

Referring to the weather map "Metmap2" for 1200 May 15 th, at position D, the winds can be expected to... Veer Westerly and strengthen. Veer Easterly and strengthen. Back Easterly and Weaken. Be affected by sea breezes.

What does "soon" mean in a weather forecast?. Within in 6 hours of the waring being given. Within 6- 12 hours of the warning being givenn. Within 12- 16 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 decreases wave length and wave height. It increases wave length , and decreases wave height. It increases wave length and height. It decreases wave length and increases wave height.

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

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

Buys Ballot's Law says that if a seafarer faces the wind in th esouthern hemisphere then 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 method used by meteorologist to forecast the weather. A line on a weather map through positions having the same pressure gradient. A line on weather map through positions having the same atmospheric pressure.

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

Referring to the weather map "Metmap 2" for 1200 May 15 th, the predominant weather system at position G is.... A deep depression. A weak low. A col. 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 eastwaeds. Move southwards. Move northwards.

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

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 .. Veer SW. Beck SW. Veer NW. Back NW.

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

Showery precipitation is most likely to be produced by... Cirrus type clouds. Cumulus or cumulonimbus clouds. Stratus clouds. Nimbostratis clouds.

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

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

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

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

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

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

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

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

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

If the atmmosphere contains less water vapour than it is capable of holding at that temperature, it is said to be... Wet. Dry. Saturated. Cape Town.

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

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

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

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

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

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

On this weather routeing chart, what does this figure indicte?. Pipeline. Telegraph line. Powr transimission line. Overhead transporter.

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

On weather routeling charts how are iceberg limits presented?. a). b). c). d).

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

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

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

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

A sudden rising strong wind, or sudden increase of wind usually followed immediately by a shower of rain or snow is called a.... Squall. Cyclone. Storrm. Tropical Cyclone.

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

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

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?. Troposphere. Stratosphere. Mesosphere. Ionosphere.

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

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

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

If an observer is facing the wind in the northern hemisphere, where does the low pressere lie?. 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 1/2 knot. The number of observations. The mean resultant. The strongest current experienced.

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

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

When visibility is 1 km or less, it is known as.... Fog. Haze. Mist. None of the other options.

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

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