Discussion
Assertion (A): Blocking events are easy to forecast.
Reason (R): Once established a block persists for a week or more.
Select the correct answer from the options below.
Answer: A
The reason is correct, and persistence does help the forecast once the block exists, but the onset and breakdown remain among the least predictable events in mid-latitude meteorology. The assertion is therefore too strong. Models also show systematic biases in block frequency and duration, so the difficulty is one of both initial condition and model error.
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