Sydney – Firefighters raced to quell massive bushfires in southeastern Australia on Tuesday, taking advantage of a brief drop in temperatures and some much-needed rainfall before another heatwave strikes later this week.Exhausted volunteers fixed containment lines, cleared ground vegetation and carried out controlled burns before temperatures and winds were expected to pick up again by Friday."It really is about shoring up protection to limit the damage potential and the outbreak of the fires over the coming days," said New South Wales Rural Fire Service commissioner Shane Fitzsimmons.He described current conditions as "much more favourable" but warned "we are expecting hotter weather to return later in the week".Dozens of vast blazes continue to burn out of control across the east of the country and there are growing fears that two fires in New South Wales and Victoria could connect to form another uncontrollable megablaze.Rainfall on Monday offered modest relief, but it was not heavy enough to extinguish the fires, and in some places it hampered firefighters' preparations by making back-burning more difficult.National recovery fundTwenty-five people have died since the start of the disaster in September, more than 1 800 homes have been destroyed, and some eight million hectares have burned, an area the size of Ireland or South Carolina.Smoke from the fires has been spotted more than 12 000km away in Chile and Argentina, weather authorities in the South American countries said.The cost of the disaster is still not clear, but the Insurance Council of Australia said claims worth Aus$700m had already been filed and the figure was expected to climb significantly.The government has earmarked an initial Aus$2bn for a national recovery fund to help devastated communities.The human toll was again laid bare on Tuesday, as firefighters held a memorial in Sydney for 36-year-old colleague Andrew O'Dwyer, who died battling blazes in late December.Volunteers in bright orange fire suits lined the road as his cortege passed – with the coffin draped in a Rural Fire Service flag.Glimmers of hopeConditions in the next week are not expected to match the worst days of the crisis, but Fitzsimmons told public broadcaster ABC it was important not to "get lulled into a false sense of security".Many of the blazes are too big to be put out, so only sustained rainfall would end the crisis.There were some faint signs on Tuesday that a reprieve may be on the way, as a tropical cyclone formed off the northwest coast."It was nice to see a cyclone forming. I shouldn't say that – hopefully no damage – but it was nice to see a cyclone forming up the top end of (Western Australia)," said Fitzsimmons."Hopefully (it is) a signal that we may see monsoon activity which will disrupt the dominant hot air mass continuing to influence so much of the weather."