Homes were carried away by torrents, vital infrastructure was destroyed and crops in the country's second-largest tract of farmland wiped out.
"I don't think we have realised the magnitude of this disaster yet," Professor Efthymios Lekkas, a disaster management expert, told state broadcaster ERT on Friday.
"We have been on the mountain," Dimitris, one of the stranded villagers, told Skai television.
One of the breadbaskets of Greece, Thessaly represents about 15 percent of the country's annual agricultural output.
($1 = 0.9328 euros)Additional reporting by Michele Kambas; Writing By Michele Kambas; editing by John StonestreetOur Standards: The Thomson Reuters Trust Principles.
Persons:
Louisa Gouliamaki, Efthymios Lekkas, George Tsatrafyllias, Kyriakos Mitsotakis, Kostas Agorastos, Dimitris, Lekkas, Michele Kambas, John Stonestreet
Organizations:
REUTERS, Greece Storm ebbs, ERT, Thomson
Locations:
Larissa, Greece, Thessaly, London, Thessaloniki, Vlochos, Karditsa