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F1-WES OIC (052010) > Additional METEO > Flashcards

Additional METEO Flashcards

1
Q

Severe Tropical Storm has a wind force of:

A

wind force 10 to 11

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2
Q

Tropical Depression has a wind force of:

A

wind force 7 or less

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3
Q

Tropical Storm has a wind force of:

A

wind force 8 to 9

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4
Q

Typhoon, Hurricane or Cyclone has a wind force of:

A

wind force 12

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5
Q

In the Northern Hemisphere, which area of the hurricane is the dangerous semicircle?

A

to the right of the storm’s track

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6
Q

In the North Atlantic Ocean, the highest frequency of tropical cyclone occurs during:

A

August, September and October

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7
Q

“Monsoon” is the most striking example of a wind system produced by:

A

alternate heating and cooling of a land mass

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8
Q

Which of the following area is the name “CYCLONE” used?

A

any of the choices

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9
Q

In the Southern Hemisphere, what is the usual sequence of direction in which a Tropical Cyclone moves?

A

Southwest, South and Southeast

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10
Q

Tropical storms DO NOT occur in which ocean?

A

South Atlantic Ocean

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11
Q

In the Northern Hemisphere, if your vessel is caught in the dangerous semi-circle, the best course of action is to bring the wind:

A

on the starboard bow, hold course and make as much headway as possible

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12
Q

In the Southern Hemisphere, the best course of action, if your vessel is caught in the dangerous semi-circle, is to bring the wind:

A

on the port bow, hold course and make as much headway as possible

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13
Q

If your vessel is maneuvering to escape from a navigable semi-circle in the Northern Hemisphere, the best course of action is to bring the wind:

A

on the starboard quarter, hold course and make as much headway as possible

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14
Q

If you have determined that your vessel is in the navigable semi-circle in the Southern Hemisphere, the best course of action is to bring the wind:

A

on the port quarter, hold course and make as much headway as possible

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15
Q

Your vessel is believed to be in the direct path of a hurricane in the Northern Hemisphere and plenty sea room is available, the best course of action is to bring the wind:

A

on the starboard quarter, note the course and head in that direction

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16
Q

In the Southern Hemisphere, your vessel is believed to be in the direct path of a hurricane and plenty sea room is available, the best course of action is to bring the wind:

A

on the port quarter, note the course and head in that direction

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17
Q

Whether your vessel is in the Northern or Southern Hemisphere, what is the best course of action if your vessel is determined to be on storm track behind.

A

avoid center by the best practicable course

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18
Q

It is a warm dry wind which initiates from horizontally moving air encountering a mountain barrier.

A

Foehn

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19
Q

In the Rocky Mountain region, this foehn wind is known by which name?

A

Chinook

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20
Q

On the west coast of the U.S., a strong, hot, dry wind blows through a pass and down a valley of that name in Southern California.

A

Santa Ana

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21
Q

A violent wind blowing from the land on the South Coast of Cuba.

A

Bayamo

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22
Q

An East wind on the coast of Sardinia.

A

Bentu De Soli

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23
Q

Briza is:

A

any of the choices

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24
Q

A name for squall in the East Indies.

A

Brubu

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25
Q

A gentle breeze in the Hebrides.

A

Kaver

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26
Q

A storm over the Hawaiian Islands, characterized by strong southerly or southwesterly winds and heavy rains.

A

Kona Storm

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27
Q

A hot, dry easterly wind of the Madeira and Canary Islands.

A

Leste

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28
Q

A strong easterly wind of the Mediterranean, especially in the strait of Gibraltar, attended by cloudy, foggy and sometimes rainy weather especially in winter.

A

Levanter

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29
Q

A strong, gusty, northeast wind which occassionaly occurs during the winter in the vicinity of Palmer, Alaska.

A

Matanuska Wind

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30
Q

A strong southeast wind in the vicinity of Palmer, Alaska, most frequent in the winter.

A

Knik Wind

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31
Q

A summer northwesterly wind blowing over Iraq and Perisian Gulf, often strong during the day, but decreasing at night.

A

Shamal

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32
Q

A southeasterly wind which sometimes blows in the Persian Gulf.

A

Sharki

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33
Q

A northeasterly or northerly winter wind off the west coast of Italy. It is a fresh wind of the fine weather mistral type.

A

Tramontana

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34
Q

A foehn wind the Schouten Islands north of New Guinea.

A

Warm Braw

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35
Q

A squall frequent from May through August between Cabo de Sao Tome and Cabo Frio on the coast of Brazil.

A

Abroholos

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36
Q

A heavy northwesr squall in Manado Bay on the north coast of the island of Celebes, prevalent from December to February.

A

Barat

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37
Q

A storm with southeast gales, caused by intense cyclonic activity off the coastas of Argentina and Uruguay, which affects the southern part of the coast of Brazil in the winter.

A

Suestado

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38
Q

The single formula used to relate maximum winds to pressure under the classification scheme developed by Panofsky and Brier.

A

Velocity in m/s = 3.9 + 3.5 (1016 – PO)1/2

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39
Q

If the storm central pressure is 990 mb, what is the approximate velocity of winds at low pressure area using the formula under the Classification Scheme developed by Panofsky and Brier?

A

21.7 meters/sec

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40
Q

The storm central pressure is 990 hPa, determine the approximate velocity of winds at low pressure area using the formula under the Classification Scheme developed by Panofsky and Brier.

A

42.2 knots

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41
Q

The approximate velocity of winds at low pressure area is 45 knots. Using the formula developed by Brier and Panofsky, determine the storm central pressure.

A

985 mb

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42
Q

Using the formula under the Classification Scheme developed by Panofsky and Brier, if the storm central pressure is 993 mb, what is the approximate velocity of winds at low pressure area?

A

20.7 meters/sec

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43
Q

Find the approximate velocity of winds at low pressure area if the storm central pressure is 993 hPa using the formula under the Classification Scheme developed by Panofsky and Brier.

A

40.2 knots

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44
Q

The velocity of winds at low pressure area is approximately 48 knots, determine the storm central pressure using the formula developed by Brier and Panofsky.

A

980 mb

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45
Q

What is the approximate velocity of winds at low pressure area using the formula under the Classification Scheme developed by Panofsky and Brier, if the storm central pressure is 996 mb?

A

19.6 meters/sec

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46
Q

Calculate the approximate velocity of winds at low pressure area using the formula under the Classification Scheme developed by Panofsky and Brier, if the storm central pressure is 996 hPa.

A

38.0 knots

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47
Q

Using the formula developed by Brier and Panofsky, determine the storm central pressure if the approximate velocity of winds at low pressure area is 40 knots.

A

992 mb

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48
Q

Determine the approximate velocity of winds at low pressure area using the formula under the Classification Scheme developed by Panofsky and Brier, if the storm central pressure is 999 mb?

A

18.3 meters/sec

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49
Q

Solve for the approximate velocity of winds at low pressure area, if the storm central pressure is 999 hPa, using the formula under the Classification Scheme developed by Panofsky and Brier.

A

35.6 knots

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50
Q

Approximate the storm central pressure if the velocity of winds at low pressure area is more or less 35 knots by using the formula developed by Brier and Panofsky.

A

1000 mb

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51
Q

The Buys and Ballot’s Law states that when facing the wind, the center of low pressure is between 12-8 points to the right in the northern hemisphere and to the left in the southern hemisphere. In order to determine the true wind, the movement of _________ is more accurate if they are visible.

A

lower clouds

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52
Q

The Buys and Ballot’s Law may be erroneous when the circulation of air about the typhoon is not ________. Thus, it may be elliptical or elongated.

A

Circular

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53
Q

It is a type of cloud which is responsible for halos around the sun and moon.

A

Cirrostratus

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54
Q

It is a dense sheet of gray or bluish color, at times it is very dark and thick. Its altitude ranges between 6,500 to 20,000 feet.

A

Altostratus

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55
Q

It is a white or gray cloud generally composed of rounded masses, rolls, etc. Its altitude ranges between 6,500 to 20,000 feet.

A

Altocumulus

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56
Q

Which of the following types of cloud is categorized as low cloud?

A

Nimbostratus

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57
Q

Among the following types of cloud which is categorized as middle cloud?

A

Altostratus

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58
Q

This is a type of cloud which is categorized as high cloud.

A

Cirrustratus

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59
Q

What type of cloud is NOT included in the principal type?

A

Nimbocumulus

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60
Q

This is NOT included in the principal types of cloud?

A

Cumulustratus

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61
Q

Among the principal types of clouds, which of the following is NOT included?

A

Stratunimbus

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62
Q

In the Beaufort Scale of Wind Force, which of the following descriptive term is NOT included?

A

Very Strong Storm

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63
Q

Which of the following descriptive term is NOT included in the Beaufort Scale of Wind Force?

A

Slight breeze

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64
Q

The following are descriptive terms in the Beaufort Scale of Wind Force, which is NOT included?

A

Violent gale

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65
Q

In the Beaufort Scale of Wind Force, the mean wind speed of 56 - 63 knots indicates a Beaufort Force of:

A

11

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66
Q

What Beaufort Force in the Beaufort Scale indicates a mean wind speed of 41 - 47 knots?

A

9

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67
Q

The mean wind speed of 28 - 33 knots indicates which Beaufort Force in the Beaufort Scale?

A

7

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68
Q

In the Beaufort Scale of Wind Force, Force 12 has a mean wind speed of:

A

64 knots and over

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69
Q

What average wind speed, in the Beaufort Scale of Wind Force, does Force 10 indicate?

A

48 - 55 knots

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70
Q

Force 8 indicates an average wind speed of how many knots in the Beaufort Scale of Wind Force?

A

34 - 40 knots

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71
Q

Which of the following instruments are used to measure humidity?

A

All of these

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72
Q

Which of the following instruments are used to measure atmospheric pressure?

A

All of these

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73
Q

An air mass that has moved down from the Scandinivian countries would most likely have what symbol?

A

cPk

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74
Q

_______________ is the symbol of an air mass which has moved down from Latin American countries such as Colombia and Venezuela.

A

cTw

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75
Q

The source of an air mass is Baltic Sea, it is labeled as:

A

mPk

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76
Q

If Persian Gulf is the source of an air mass it is has a symbol of:

A

mTw

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77
Q

Among the following source of an air mass with a symbol “mTw” is:

A

Sulu Sea

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78
Q

Which of the following sources of an air mass be labeled “mPk”?

A

North Sea

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79
Q

Which source of an air mass can be labeled “cPk”?

A

Canada

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80
Q

________________ is a source of an air mass which has a symbol of “cTw”.

A

Singapore

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81
Q

The equatorial currents set in what direction?

A

Westward

82
Q

The equatorial counter currents set in what direction?

A

Eastward

83
Q

When the Gulf Stream water encounter cold air, evaporation is so rapid that it causes:

A

Frost smoke

84
Q

The North Atlantic current sets in what direction?

A

Eastward

85
Q

In what direction does the Davidson current flow?

A

Northerly along the California coast

86
Q

Primarily, an ocean current is caused by what factor?

A

Prevailing wind

87
Q

The Canary currents set in what direction?

A

Southward

88
Q

Which direction does the Brazillian current set?

A

Toward the south

89
Q

The North Pacific current is setting in what direction?

A

Easterly

90
Q

Your vessel is in the Kuroshio current, in which direction would you expect to be set?

A

To the north and east

91
Q

The Indian Ocean currents flow in what direction?

A

Have direction change according to the monsoons

92
Q

On the poleward side of the horse latitudes the winds will be predominently:

A

Westerly

93
Q

During the day the temperature of the land becomes warmer than the sea. The result is:

A

A sea breeze

94
Q

During the evening the land gives off its heat and falls below the temperature of the water. The result would be:

A

A land breeze

95
Q

The summer monsoon is caused by:

A

A low pressure over the land

96
Q

The summer monsoon is characterized by:

A

Southerly winds

97
Q

The summer monsoon is characterized by:

A

Rainfall

98
Q

The winter monsoon is caused by:

A

A low pressure area over the sea

99
Q

The winter monsoon is characterized by:

A

Northerly wind

100
Q

The winter monsoon is characterized by:

A

Clear skies

101
Q

The trade wind blow:

A

From the belts of high pressure toward the doldrums

102
Q

The trade wind blow:

A

From the northeast in the northern hemisphere and southeast in the southern hemisphere

103
Q

The belts of high pressure on the poleward side of the trade winds are called:

A

Horse latitudes

104
Q

The primary cause of wind is:

A

The unequal heating of the earth’s surface

105
Q

The doldrums are is characterized by:

A

Overcast, with showers and thundershowers

106
Q

The Williwaw of the Aleutian coast, the Tehuantepecer of the Mexican and Central American coast, the Pampero of the Argentine coast, the Mistral of the Western Mediterranean, and the Bora of the Eastern Mediterranean are examples of which of the following?

A

Fall wind

107
Q

A vertical development clouds that are associated with good weather.

A

Cumulus clouds

108
Q

Massive clouds of great vertical development are known as:

A

Cumulonimbus clouds

109
Q

How do you describe cirrus clouds?

A

High altitude clouds of feathery appearance

110
Q

High altitude clouds composed of small white flakes or scales, or very small globular masses, are called:

A

Cirrocumulus clouds

111
Q

High altitude clouds sometimes covering the sky completely, giving it a milky appearance, would be called:

A

Cirrostratus clouds

112
Q

Middle altitude clouds consisting of a layer of large, ball-like masses which have a tendency to merge together, are called:

A

Altocumulus clouds

113
Q

Middle altitude clouds having the appearance of a grayish or bluish fibrous veil or sheet are called:

A

Altostratus clouds

114
Q

It is a low altitude clouds in a uniform layer resembling fog.

A

Stratus clouds

115
Q

Low clouds that are dark and shapeless. It is also a typical rain cloud.

A

Nimbostratus clouds

116
Q

Cumulonimbus clouds are associated with: I. Thunderstorms II. Tornadoes

A

Both I and II

117
Q

What is (are) the predominant feature(s) of the dangerous semicircle of a hurricane? I. Higher winds II. Winds will carry the vessel directly into the path of the hurricane

A

Both I and II

118
Q

If warmer air is replacing colder air, this is known as:

A

A warm front

119
Q

In the warm sector of a frontal waves, the sky is:

A

Generally clear with few cumulus or stratocumulus clouds

120
Q

If colder air is replacing warmer air, this is known as:

A

A cold front

121
Q

Tropical cyclones are dangerous to navigate because they: I. Cover an entire ocean II. Have a large amount of energy in a relatively small area

A

II only

122
Q

In the Northern Hemisphere, tropical cyclones are most prominent in what month?

A

September

123
Q

In the eye of a tropical cyclone, which of the following conditions would you expect to encounter?

A

Calm wind

124
Q

You are in the northern hemisphere in a tropical cyclone. The wind is veering. What must you inform the Master concerning the position of your vessel in relation to the storm?

A

The vessel is in the dangerous semicircle of the storm

125
Q

You are in the northern hemisphere in a tropical cyclone. What could you recommend to the Master if the wind is veering?

A

Bring wind on starboard bow, hold course and make as much way as possible

126
Q

With a tropical cyclone at 300 to 600 miles distance:

A

Cirrus clouds converge in the direction from which the storm is approaching

127
Q

The bar of a tropical cyclone is characterized by:

A

Cumulonimbus clouds

128
Q

In a tropical cyclone, the barometric pressure will drop to the lowest point at the:

A

Eye of the storm

129
Q

While advising the Master concerning a tropical cyclone in the Northern hemisphere, what would you bear in mind?

A

The navigable semicircle will be to the left of the storm track as you face the direction in which the storm is moving

130
Q

The wind direction remains steady with increasing speed and falling barometric pressure. What may you report to the Master as to the position of your vessel in relation to a tropical cyclone?

A

The vessel is on the storm track, in front if the center

131
Q

Buys Ballot’s law is still a useful aid when the deck officer is determining the direction of the center of a low pressure area. What is this law in the northern hemisphere?

A

Face into the wind; the center of the low pressure will be 8 to 12 points to your right

132
Q

As a ship proceeds into higher latitudes, the first form of ice it would be likely to encounter would be in the form of:

A

Icebergs

133
Q

An iceberg would generally float with:

A

Nine tenths of its mass below water

134
Q

In both hemisphere, ice is rarely encountered in latitudes lower than:

A

40˚

135
Q

Why is the Dangerous Semi-Circle so called? I.Higher winds are experienced in this semi-circle II. The winds will carry the vessel directly into the path of the hurricane

A

Both I and II

136
Q

The wind system that is prominent in determining the weather on the North American continent is the:

A

Prevailing westerlies

137
Q

A low pressure system in the Southern Hemisphere would have which of the following characteristics? I. Winds blowing from the center outwards II. Winds circulating counterclockwise

A

Neither I nor II

138
Q

In a high pressure system in the Northern Hemisphere: I. Winds blow outward. II. Winds blow counterclockwise

A

I only

139
Q

A swift current occurring in a narrow passage connecting two large bodies of water which is produced by the continuously changing difference in height of tide at the two ends of the passage is called a(n):

A

hydraulic current

140
Q

In the Southern hemisphere the wind flow associated with a low pressure system will have which of the following characteristics? I. The wind velocity is least near the center of the system II. The direction of the flow is counter-clockwise

A

Neither I nor II

141
Q

The atmosphere in the vicinity of a low pressure area is called a(n):

A

cold front

142
Q

When the hurricane passes into high latitudes over colder water and the source of heat is disrupted, the storm assumes the characteristics of:

A

an extratropical cyclone

143
Q

A local wind which occurs during the daytime and is caused by the different rates of warming of land and water.

A

sea breeze

144
Q

You are attempting to locate your position with reference to a hurricane center in the Northern Hemisphere. If the wind direction remains steady but velocity diminishes with time, you are most likely:

A

on the storm track behind the center

145
Q

The primary wind belt which has the greatest effect on the set, drift and depth of the equatorial currents is the:

A

trade winds

146
Q

The prevailing winds in the band of the latitude from approximately 15˚ north to 30˚ north are called the:

A

northeast trade winds

147
Q

Cyclones having warm sectors usually move:

A

parallel to the isobars in the warm sector

148
Q

A frontal thunderstorm is caused by:

A

a warm air mass rising over a cold air mass

149
Q

Weather conditions in the middle latitudes move generally in what direction?

A

Eastward

150
Q

Which of the following concerning the speed of fronts is TRUE?

A

Cold fronts move faster than warm fronts

151
Q

What will occur when a cold air displaces warm air?

A

Cold front

152
Q

The barometric pressure usually rises and the temperature drops after the passage of a:

A

after the passage of a cold front

153
Q

The visibility improves rapidly:

A

after the passage of a cold front

154
Q

Which of the following Katabatic winds is a “FOEHN”?

A

Chinook

155
Q

The following are Katabatic winds, which one is a “FALL WIND”?

A

All of the mentioned choices are correct

156
Q

The following Katabatic winds are “FALL WIND” except:

A

Sirrocco

157
Q

“FOEHN” is a dry wind with a downward component. Which of the following is a “FOEHN”?

A

All of the mentioned choices are correct

158
Q

“FALL WIND” is a cold wind which blows down an incline. The following are “FALL WINDS” except:

A

None of these

159
Q

These are ice deposits in the temperate regions caused by the sublimation of water vapor directly into crystalline form.

A

Frost

160
Q

It is the ratio of the actual vapor content at the current temperature to the air’s vapor holding capability.

A

Relative humidity

161
Q

If the isobars are straight the wind is called:

A

Geostrophic wind

162
Q

What do you call the wind if the isobars are curved?

A

Gradient wind

163
Q

Which of the following weather conditions are expected in the doldrums?

A

any of the choices

164
Q

When an observer in the Northern Hemisphere experiences a Southwest wind, according to Buys Ballot’s Law, the center of Low Pressure is located to the:

A

Northwest

165
Q

In the Southern Hemisphere, when an observer experiences a Southeast wind, according to Buys Ballot’s Law, where is the center of Low Pressure located?

A

Northeast

166
Q

According to Buys Ballot’s Law, when an observer in the Northern Hemisphere experiences a Northwest wind, the center of High Pressure is located which direciton?

A

Southwest

167
Q

The center of High Pressure in the Southern hemisphere is to the ______________ of an observer if he experiences a Northeast wind, as per to Buys Ballot’s Law.

A

Southeast

168
Q

During a specified time interval, it is a line of equal change in atmospheric pressure.

A

Isallobar

169
Q

If you enounter a steady precipitation at sea, this is typical of what kind of weather condition?

A

A warm front weather condition

170
Q

Passage of a _________________ is usually associated by brief, violent showers frequently accompanied by thunder and lightning.

A

cold front

171
Q

Which of the following may occur along or some distance ahead of a cold front?

A

all of the choices

172
Q

It is a weather system in the Philippines which is characterized by rainfall and thunderstorms with occasional passages of tropical storms.

A

Southwest Monsoon

173
Q

It is a weather system in the Philippines which is locally known as the “Habagat”.

A

Southwest Monsoon

174
Q

The “Southwest Monsoon” is otherwise known as:

A

Summer monsoon

175
Q

It is a weather system in the Philippines which is characterized by prevailing northeasterly chilled wind from Siberia.

A

Northeast Monsoon

176
Q

It is a weather system in the Philippines which is locally known as the “Amihan”.

A

Northeast Monsoon

177
Q

The “Northeast Monsoon” is otherwise known as:

A

Winter monsoon

178
Q

Based on the latitude in which it originates, which of the following currents is considered “warm”?

A

Kuroshio

179
Q

The following is a part of the “Gulf Stream system” except:

A

Antilles current

180
Q

What do you call the waves caused by winds blowing along a coast which tend to set up long waves that travel along the coast raising the sea level at the crest and lowering the sea level at the trough.

A

Storm surges

181
Q

What is the safest action to do upon receiving notice that a Tsunami is expected to strike the islands in six hours and you are anchored in the Aleutian island chain.

A

Get underway and be in deep, open ocean water when the Tsunami arrives

182
Q

Between latitude 40 deg and 43 deg N, what do you call the cold ocean current which meets the warm Gulf stream to form the “cold wall”?

A

Labrador current

183
Q

What do you call the current flowing from the higher latitudes north or south going towards the equator?

A

Cold current

184
Q

In the Northern Hemisphere, the deflection of a wind driven currents is to the right of the wind direction and in the Southern Hemisphere, the deflection is to the left, is caused by:

A

The Coriolis force

185
Q

In which direction does the Humboldt Current flow?

A

Northerly

186
Q

It is an instrument which registers the height of the tide against a scale of the tide data which is recorded for the actual reading computation.

A

Automatic tide range

187
Q

Currents are caused by: I. Meteorological factors such as wind and barometric pressure II. Oceanographical factors such as different salinity of water and temperature.

A

Both I and II

188
Q

Swell waves caused by ______________ that continue on without relation to local winds.

A

storms

189
Q

It is a current flowing along the west coast of the United States in southerly direction which causes extensive fog in that area.

A

California current

190
Q

Swell waves emanate from distant storms which continue their progress across the oceans till they reach shallow water when they abruptly steepen, increase in height and sweep to the shore. These waves are known as:

A

rollers

191
Q

What do you call the current which is the continuation of the South Pacific Equatorial Current after its division near the Fiji Island.

A

Rossel Current

192
Q

In the North Atlantic Ocean, the average number of Hurricanes per annum is:

A

8

193
Q

In the Western North Pacific, the Tropical Cyclone is otherwise known as “TYPHOON”, including the Philippines which is locally known as “BAGUIO”. Its annual average is:

A

22

194
Q

In the North Indian Ocean (Bay of Bengal) has an everage Tropical Cyclones of ___________ in a year.

A

5 to 6

195
Q

Subsurface water renewal is achieved by currents which are driven by density differences produced by haline (salinity) and thermal (temperature) effects. Therefore, this associated circulation is referred to as the:

A

Ekman Transport

196
Q

Swell generally moves across the surface somewhat regular until it reaches the depth of water of about one half the wavelength. The waves become unstable, topples forward and form a:

A

breaker

197
Q

Tropical Depression has a maximum sustained surface wind speed of:

A

33 knots

198
Q

What is the highest sustained surface wind speed of a Tropical Storm?

A

34 to 63 knots

199
Q

The highest sustained surface wind speed for a Typhoon or Hurricane is:

A

64 knots and over

200
Q

It has one or more closed isobars and some rotary circulation at the surface.

A

Tropical Depression

201
Q

This has closed isobars and a distinct rotary circulation at the surface.

A

Tropical Storm

202
Q

_________________ has closed isobars, a strong and very pronounced rotary circulation.

A

Typhoon or Hurricane

F1-WES OIC (052010) (6 decks)

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