Following received from Jorge, LU1AS.

The flooding rains have been very strong in the city of Buenos Aires and surrounding areas, and in the city of La Plata, which is the capital of the Province of Buenos Aires, located 60 kilometers south of the City of Buenos Aires.  So far 57 people have died, 51 of them in La Plata.

The frequencies that are being used on 40 meters are 7070 and 7120, ina addition to VHF and UHF repeaters kept on alert for the radio club La Plata   LU8DZE.
There are also a lot of communication activity through Facebook Emergenciaslu Amateur group, maintained by the sera, Amateur Radio Emergency Service of Argentina.