Medium Large Transport
Flight Crew Air Transport Pilot (ATP)
Communication Breakdown
Deviation / Discrepancy - Procedural Published Material / Policy; Deviation / Discrepancy - Procedural Weight And Balance
General None Reported / Taken
Company Policy
We were loading and the current weather began to change.  We were already using fluid numbers for performance due to deicing requirements but then it began to snow.  My First Officer gave me new numbers for performance due to icing conditions.  Here is where simple gets curiously strange.  Who to contact?  I called [the load planner] to advise them of the new Maximum Takeoff Weight (MTOW) due to performance.  I was advised they had the most accurate info from dispatch and they could make no adjustments to MTOW.  I desperately tried to advise them of our intent and it became quite clear there is no plan or training for [the load planner] to adjust MTOW due to real time weather the pilots are trying to make.  Flight plan shows MTOW of 64408 and our new MTOW was 61100.  Our actual TOW was 56340.  We had inclement weather; delays and flow to destination.  In an effort to keep the wheels turning I chose to continue since there is no weight violation and try to help fix the problem today.   The real problem here is we have been completely removed from this process and we need to all work together to run safely.  Currently leaving with an inaccurate MTOW on the final paperwork seems not wrong; misleading; but a trap putting a flight in potential risk.As best I can tell this scenario is just not covered in our new program.  There is no training for it and it seems our [load planning] agents don't actually know what we are doing when the weather is not clear when it comes to performance.1) All parties need a real understanding of our role in this scenario.  What we are really trying to do. There is zero guidance.2) Pilots should have direct contact with [the load planner] to adjust MTOW if need by performance.3) Dispatch does not need to be contacted unless the new number is to restrictive and we need other options to maintain payload.There seems to be others issues that are slowly working themselves out but this seems to be a legal trap to not only the company but the flight crews legally and the safety of flight.  This issue will occur as long as we have performance issues like icing and heavy loads; we did it on three flights in one day.I would like to help any way possible to get this resolved TODAY; it cannot wait till tomorrow.
A flight crew had difficulty having load planning change maximum take off weight to reflect real time weather conditions.