Melbourne(CNN) Severe thunderstorms are pelting some regions of Australia suffering from historic wildfires with powerful rain, bringing much-needed relief to firefighters battling the worst blazes the country has seen in decades.
"Our fingers are crossed that this continues over the coming days," the New South Wales Rural Fire Service (RFS) said Friday in a tweet.
Rain has fallen on most firegrounds in the state over the last 24 hours, the RFS said. However, it wasn't enough to put out the flames. Eighty-two fires are still burning, including 30 that are yet to be contained.
Residents of drought-hit areas who have spent years waiting for rain celebrated its arrival on Thursday. Rain fell in major cities, including Sydney, where water flowed through the streets.
Forecasters predict more rain over the next few days, but they warn it could cause flash flooding in areas of parched land. Years of drought have left some regions so dry that rain just runs off the ground. The massive fires have burned through some of the vegetation that would normally soak up the precipitation.
Trees weakened by fire are also at risk of falling, and rain could wash ash and debris in waterways, causing water pollution, authorities say.
The Victoria State Emergency Service posted several images on Facebook showing damage from the storm, including a sinkhole four meters (13 feet) deep.
Lightning from the storms has sparked a number of new grass fires in New South Wales and Victoria, though it's hoped the damp conditions will help stop the flames from spreading.
Parts of Melbourne were hit with as much as 77 millimeters (3 inches) of rain, causing flooding and some damage, the Victoria Bureau of Meteorology said Thursday.
CNN affiliate Nine News reported some neighborhoods were hit by a month's worth of rain in just hours, though not in East Gippsland, where some of the worst fires in the state are raging.
Earlier this week, the New South Wales RFS had said that if the rain forecasts held true, it could be a panacea for the region's firefighters.
"This will be all of our Christmas, birthday, engagement, anniversary, wedding and graduation presents rolled into one," it said Monday on Twitter. "Fingers crossed."
The fires that have swept through Victoria and NSW all summer are some of the most powerful and damaging conflagrations Australia has seen in decades.
At least 28 people have died nationwide, and in the state of NSW alone, more than 3,000 homes have been destroyed or damaged. State and federal authorities are struggling to contain the massive blazes, even with firefighting assistance from other countries, including the United States.
All this has been exacerbated by persistent heat and drought caused by climate change. Tens of thousands of people participated in protests around the country last week calling on the government to do more to combat the climate crisis.
The situation is already dire. Significant amounts of flora and fauna unique to Australia have been burned or killed. One group of ecologists estimated that perhaps a billion animals have been affected nationwide. Some towns have been running out of water. Others have gone up in flames completely.
Smoke from the fires has blanketed major cities in haze in recent weeks.
Rain has helped clear the skies, but the air quality is expected to worsen in coming days, according to the Victoria Environment Protection Authority.
Haze has affected the Australian Open tennis tournament in Melbourne, with officials canceling some practice sessions and qualifying matches earlier this week. Slovenia's Dalila Jakupovic was forced to retire after having trouble breathing.
In recent years, extreme temperatures have made for tough conditions at tennis' first Grand Slam of the calendar year -- some competitors collapsed or complained of heatstroke at the 2018 event.
Tennis Australia officials say they're taking precautions to protect players should the heat and smog return.
Temperatures in Melbourne have dropped sharply in the last 48 hours, to below 20 degrees Celsius (68 Fahrenheit), eliminating the risk of excessive heat -- for now.