Snowflake-making spell

"...and redirecting his wand away from the ceiling from which, sure enough, large white flakes had started to fall."

- Ron Weasley's accidental use of the spell in 1996

This unidentified spell was used unintentionally by Ronald Weasley in 1996 whilst practising the spell to turn vinegar into wine, due to his being distracted by his talking to his friend.

Appearances

 * Harry Potter and the Half-Blood Prince