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Which weather does a persistent block bring beneath its centre?

  • A.Dry settled conditions with light winds
  • B.Persistent heavy rainfall as successive frontal systems are steered directly over the same region below
  • C.Strong gales
  • D.Rapid alternation between mild and cold spells as short waves pass around the northern flank of it

Answer: A

Subsidence within the anticyclone suppresses cloud and the diverted storm track keeps fronts away, giving prolonged dry weather that can become a heatwave in summer or a cold spell in winter. Heavy rain and gales occur instead in the diverted flow around the flanks. The European heatwave of 2003 and the Russian heatwave of 2010 were both associated with persistent blocking. The quantity that varies and the quantity that does not are worth naming before any substitution is attempted.

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