This has increased to 5 members on today's 00Z.
Crucial aspect: members with major SSW straddle both sides of mean until ~Dec 15, suggesting shorter-term uncertaintly is unimportant for the longer-term evolution. We will know more once the deceleration is more clustered. pic.twitter.com/3kxWZAoDgJ

— Dr Simon Lee (@SimonLeeWx) December 4, 2018