Easterly Waves

Tropical weather is often initiated by easterly waves-->

easterly waves:

  • have wavelengths of about 2500 km
  • position is found in a trough of streamline pattern
  • convergence/upward motion on east side
  • divergence/downward motion on west side
  • travel from east to west at 10-20 knots
  • hurricanes are often initiated by easterly waves.... here is the visual evidence
  • Now, let's look at the anatomy of a hurricane.....