For the day 1 forecast group it is important to compare model output moisture with recent observations from different sources, like surface obs, soundings or satellite retrievals. On the following photo the precipitable water for the lower troposphere is watched by the ESSL Testbed participants (and there is also a difference-to-model product available this year):

EUMETSAT NWC-SAF PW low layer product used for day 1 forecast

Focused model studies (including model soundings) in the day 2 forecast group this morning:

Very concentrated work at 8 UTC today