Non-frontal Depressions Flashcards
What are the 5 key threats of tropical revolving storms?
- Structural damage
- Loss of control
- Instrument error
- Disorientation
- Loss of situational awareness
What must the wind speed be in order to classify as a tropical revolving storm?
Excess of 64kt
What is the typical diameter and height of a TRS?
- 400-500nm diameter (up to 1000nm)
- Height up to the tropopause
What fuels a TRS?
Water vapour evaporated from the warm sea and heavy precipitation
What temperature must the ocean be for a TRS to start?
At least 26.5 degrees
What must the stability of the atmosphere be to form a TRS?
Unstable
Why are TRS found between 5-30 degree N/S of the equator?
They need the Coriolis effect
Where is the fastest wind found on a TRS?
On the right track in the northern hemisphere
On the left track in the Southern Hemisphere
Why do TRS decay?
- Moves over land
- Moves over colder oceans
What is the average lifespan of a TRS?
10 days
When do TRS occur in the northern hemisphere?
- June to October
- Most active August to September
When do TRS occur in the Southern Hemisphere?
- December to April
- Most active January to February
What is an easterly wave?
Wave in a trade wind belt, moving from east to west, with severe convective activity in rear of its trough
