PPL » Meteorology » Thunderstorms
8.30.2 State the three conditions required for the development of thunderstorms.
Thunderstorms are defined as one or more electrical discharges indicated by lighting or thunder. This is due to a build up of static electricity caused mainly by friction.
- An atmosphere that is unstable through a deep layer
- An adequate supply of moisture from below
- A Trigger action which causes the initial upsurge of the unstable air
8.30.4 Describe the three stages in the life-cycle of a thunderstorm.
Three stages of thunderstorms
- 15-30 minutes
- 10,000 – 15,000 ft
- Rate of growth up to 2000 ft / min!!
- Latent heat released by condensation – increasing instability.
- Precipitation suspended in updraughts.
- 15-20 minutes
- 25,000 – 40,000 ft
- Rain on the leading edge.
- Downdrafts at leading edge (first gust)
- Maximum development at the anvil.
- Downdraughts and rain beneath entire thunderstorm.
- Rain less intense.
- Anvil becomes widespread.
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