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Question Bank
Questions for DEPRESSIONS
Answer the following questions
Test Mode
Training Mode
1. A thermal depression is likely to form
on the trailing edge of a warm sector mid latitude depression
in the lee of the Alps over Northern Italy in winter
in association with a marked trough of low pressure over the USA
over the Iberian peninsular during the summer
2. With reference to tropical revolving storms, which of the following statements is correct
hurricanes, in the South Atlantic sometimes affect the east coast of Brazil
cyclones, occur in the Bay of Bengal in winter
typhoons are found in the South China sea in January
hurricanes affect the south east of the USA in late summer
3. Flying conditions in a Secondary low pressure system are
Less severe than in a Primary low
Relatively calm
Always more severe than in a Primary low
Sometimes more severe than in a Primary low
4. Extensive cloud and precipitation is often associated with a non-frontal thermal depression because of
Surface divergence and upper level convergence causing widespread descent of air in the depression
Surface divergence and upper level convergence causing widespread ascent of air in the depression
Surface convergence and upper level divergence causing widespread ascent of air in the depression
Surface convergence and upper level divergence causing widespread descent of air in the depression
5. A Secondary Depression would form in association with
A Polar Depression
A Col
A Polar Front Low
A Summer Thermal Depression over the Mediterranean or Caspian Sea.
6. Which of the following statements accurately describes the “West African Tornado”
the West African Tornado is similar to the North American and European tornadoes
it is a line of thunderstorms producing a line squall aligned roughly north/south
it is another name for the cyclones that affect the West African coast in summer
it is the name given to a line of thunderstorms that lie along the ITCZ but some 200 miles to the south
7. In comparison with a primary depression a secondary depression is
Sometimes more active
Unlikely to produce gale force winds
Always more active
Never more active
8. Tropical revolving storms usually
form close to one side of the equator and while moving slowly in a westerly direction, cross over to the other hemisphere
move in a westerly direction before re-curving towards the equator
move in an easterly direction before re-curving towards the nearest pole
do not form within 5° of the equator
9. Which of the following are Thermal Depressions
Tropical revolving storms, polar air depressions, tornadoes
The equatorial trough, monsoon lows, some depressions over the central and eastern Mediterranean sea in summer
The equatorial trough, polar air depressions, monsoon lows, orographic lows
The lows forming over flat land in summer, polar air depressions, tropical revolving storms, some of the lows which form over inland seas in winter
10. Tropical Revolving Storms
Usually have the most severe weather in the quadrant to the right of the track in a Hurricane
Are always given a male first name beginning with “A” for the first of the season and thereafter named in alphabetical order of occurrence
Regenerate after crossing the coast from sea to land
Have internal wind speeds of 10-20 knots rotating cyclonically round a subsiding clear air core known as the eye
11. Tropical Revolving Storms
Occur principally in spring and early summer.
Intensify after crossing coasts.
Generally move from east to west before turning towards the equator.
Do not occur in the South Atlantic.
12. A Secondary low pressure system rotates around a Primary low
At a constant distance
Into the primary
Anticyclonically.
Cyclonically
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