I don't understand the comments about the ENSO state for a system within 72 hours. The ENSO is helpful for long-range guesstimating, not short-term anything. Is it less likely to have a MECS in a Niña? Yes. If the correct ingredients are there for a MECS, and it happens to be in a Niña, will it still happen? Yes. ENSO only affects the odds of the players coming to the table. Once the players are on the table, the atmosphere cares not if it's Niña or Niño; a storm won't downtrend or uptrend solely because of the ENSO state.