The most common and most likely answer to this crossword clue is the 10 letter word WATERSPOUT
I've seen this crossword clue in The Daily Telegraph
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More clues leading to the result WATERSPOUT
Buddy explains!
The straight part
We know that "it’s an effect of the weather" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case it’s an effect of the weather = waterspout.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does WATERSPOUT mean?
WATERSPOUT noun- A whirlwind that forms over water, not associated with a mesocyclone of a thunderstorm (contrary to a true tornado).
- A true tornado that passes over a body of water.
- A channel through which water is discharged, especially from the gutters of a roof.