@Filip_K perhaps the form is blocked from outside of Argentina. Already sent a request myself.After posting the form I received a automated mail from atencionciudadana AT inta.gob.ar with an support ticket (number 4070). So fingers crossed.
Calling to the Servicio Meteorológico Nacional seems to be a dead end, I only reach a poorly designed automated call response service. So far I couldn't reach any human being behind it. I'm going to keep trying.
I'm also calling to INTA, but there is a long queue.
It should be a way. I hope that Michael Diener from rain Alarm answers and tells us his secret :)
Thanks for your dedication, Argentina is a messy country. I'm very happy with your interest.