Large hail has fallen in an area north-east of Hobart, with authorities warning of potential flooding and damage from "intense" thunderstorms rolling across the state.
Severe thunderstorm warnings for large hailstones and heavy rain were issued for parts of the east coast and midlands throughout Monday.
The Bureau of Meteorology said "giant hail" had been reported at Carlton River, north-east of Hobart.
Senior meteorologist Brooke Oakley said hail that size was "very dangerous".
"We have had pictures from members of the public that have indicated that there's been hail between 2 and 5 centimetres in diameter, very close to the threshold for giant hail which is very rare for Tasmania."
"There have been reports of broken car windscreens … it's also unsafe for people who are outside potentially getting hit."
"While thunderstorms aren't rare in Tasmania, storms of this intensity are very rare."
Ms Oakley said the storms developed over northern Tasmania this morning before moving over the north-east of the state.
"Over the Hobart area, it's unlikely that we will see thunderstorms but they still are a possibility and we'll be monitoring those storms closely."
Ms Oakley said there was very little rainfall in Launceston when the thunderstorms moved over.
"The highest rainfall that we've seen today has been about Dunalley which received 13mm of rain in less than 30 minutes."
Ms Oakley said a cold front is forecast to move over the state tonight and early tomorrow morning which will reduce temperatures significantly.
On Monday evening Tasmania Police advised there had been reports of water over the Tasman Highway just north of Triabunna towards Swansea, on the east coast.
Taste delays opening time
Earlier on Monday, the Taste of Summer delayed its opening from 12pm to 3pm to avoid the storm, saying the comfort and safety of patrons, staff and stallholders were its top priority.
"The advice that we got is that there is a weather event coming through Hobart … just for patrons’ safety and the safety of everyone on our site, all of our stall holders and staff, we think it's best to bunker down during that period and extend our trading out an hour," CEO Stephen McMullen said.
"We sent an email out and an SMS to all of our ticket holders for today and we've also used social media and other forms of media to get the message out. There is a refund policy that is case-by-case.
"We've got around 2,000 ticket holders for today but there's been quite a walk-up contingent for the event, so we would imagine that would continue."
The SES's Leon Smith said the agency was also liaising with the Bureau of Meteorology and Big Bash League (BBL) organisers around the weather and urged people to keep across any updates.
The Hobart Hurricanes will square off against the Adelaide Strikers in the BBL tonight.
"The event organisers will obviously consider the weather situation and make a decision at the time," he said.
"I urge people who will consider potentially attending those events to just maintain a watch on those websites and look out for updates."
The storms come ahead of a cold front after a string of warm, sunny days.
Tomorrow is expected to see a cool change with a top of 16 degrees Celsius and a minimum of 13C, before temperatures again pick up again into the 20s later in the week.
Sunday is set to be the hottest day of the week — hovering near 30C around much of the state.
Mr Smith said after the storms sweep through, the SES was expecting to see "a window of relatively settled weather, after about 6pm or 7pm".
