Discussion
Which practical difficulty do blocks present?
Answer: D
Once established a block is persistent and therefore relatively predictable, but the transitions into and out of the blocked state remain among the hardest forecasting problems in mid-latitudes. Models also show systematic errors in block frequency and duration. Blocks are prominent features easily identified in analyses, and they are more common in the northern hemisphere than the southern. Most errors here come from carrying a result across from a neighbouring case where it does not hold.
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