rapid deepening phase of storm

srah1953

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In an Irish weather forecast talking about storm Brendan curently crossing the country, the forecaster said, yesterday, something like "the storm was going through its typical rapid deepening phase". I understand the meaning of rapid depending, but what I'm curious about was the reference to the "typical" phase. I don't remember the exact word that was used, but it implied that it was a normal and expected element in a North Atlantic storm.
Can anyone explain this, please? i.e. the circumstances that might give rise to it and does it always happen? It doesn't happen in every depression that crosses the Atantic.
Thanks
PS I've read and tried to study a couple of weather books but nothing really sticks in my mind.
 
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