Tropical Cyclones Flashcards
1
Q
When and where do tropical cyclones originate?
A
Late summer or autumn, over warm tropical oceans
2
Q
What latitude do T.C originate?
A
Within 5 and 20 north and south
3
Q
WHAT DO T.C NEED TO FORM?
A
Coriolis force
4
Q
AT WHAT RATE DO T.C MOVE?
A
40-200km/h
5
Q
WHICH DIRECTION DO T.C MOVE?
A
Move westward and curve back eastward near 20-30 N and S
6
Q
WHAT FACTORS ARE NECESSARY FOR THE FORMATION OF T.C?
A
- sea temp of atleast 26
- high humidity
- unstable air
- little surface frition
- light variable winds
- low air pressure
- divergence of air at upper levels
7
Q
WHAT IS THE FIRST STAGE OF DEVELOPMENT?
A
FORMATIVE STAGE
- air pressure above 1000hPa
- high sea and air temp
- cirrus/cumulus clouds(light rain)
- wind circulate around LP
- small area influenced
8
Q
WHAT IS THE SECOND STAGE OF DEVELOPMENT?
A
IMMATURE STAGE
- air pressure below 1000hPa
- converging warm moist air continue to rise
- wind speed increases
- spiral band of clouds form(light rain)
- cumulonimbus clouds surround the eye
- larger area influenced
9
Q
WHAT IS THE THIRD STAGE OF DEVELOPMENT?
A
MATURE STAGE
- pressure well below 1000hPa
- heavy rain
- hurricane strength wind
- can last up to 7 days
10
Q
WHAT IS THE FOURTH STAGE OF DEVELOPMENT?
A
DEGENERATING STAGE
- air pressure rises
- temp decrease
- wind decrease in speed
- area affected shrinks
11
Q
WHAT IS THE WEATHER BEFORE THE EYE?
A
- south wind
- hurricane wind
- decrease air pressure
- HEAVY rain
- cumulonimbus clouds
12
Q
WHAT IS THE WEATHER IN THE EYE?
A
- no wind/rain/clouds
- lowest air pressure
- temp increases
- warm moist air rises
- cool air descends
13
Q
WHAT IS THE WEATHER AFTER THE EYE?
A
- north wind
- storm wind
- air pressure increase
- heavy rainfall
- starts to dissipate
