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Upper Waves
	
	seldom
	
	
	typically
	
	seldom
show intensive precipitation. The reason for this is that the phenomenon takes place at
	
	low
	
	
	middle
	
	
	high
	
	high
levels. The further development of an Upper Wave is typically
	
	into an Occlusion cloud spiral
	
	
	a rapid decay
	
	
	into a classical Wave
	
	a rapid decay
.