Increase in TC genesis tracks in stream=oper, type=tf since IFS Cycle 50r1

AIFS, IFS and OpenIFS
1

Hi,

Since the implementation of IFS Cycle 50r1 on 12 May 2026, we have noticed a significant increase in the number of genesis-category tropical cyclone tracks (storm IDs 70–99) received via our real-time dissemination under stream=oper, type=tf.

For example, the 20 May 2026 12Z control run produced 6 genesis tracks across 5 basins (70W, 71W, 72W, 70E, 70L, 70A), and the 21 May 00Z run produced 4 across 3 basins (70W, 71W, 70L, 70B). All messages show ensembleMemberNumber=51, ensembleForecastType=0.

Has there been a change to the TC tracking algorithm or its detection/filtering criteria as part of Cycle 50r1 that would explain an increase in the number of genesis tracks produced per run?

Our dissemination configuration for reference:

disseminate,
  class    = od,
  stream   = oper,
  expver   = 0001,
  type     = tf,
  levtype  = sfc,
  time     = 0000/1200,
  step     = 360

Thank you.