Heavy rain in Australia's southeast triggered flash flooding and cut off entire towns on Wednesday, stranding some residents on the roofs of their homes, as authorities issued snap evacuation orders with rivers staying above danger levels.

Toronto and the GTA are under a rainfall warning with up to 60 millimeters expected by the end of the day Thursday.

NSW Police report 590 flood rescues, many by helicopter; several lives lost, says Assistant Commissioner Waddell

Flash flooding on Australia’s southeast coast has killed two people and cut off towns, isolating tens of thousands of residents, as officials warned more downpours were expected over the next 24 hours.

The Mid North Coast has been warned to prepare for “dangerous and life-threatening” weather conditions and flash flooding, as six-hourly rainfall totals between 100 and 150mm are predicted to hit parts of the region on Wednesday and Thursday.

Roads and railroads in Bourbon County have been damaged by the recent storm system that came through this weekend.

Flash flooding is a concern through the night, especially in the River Valley. Sign up for our Newsletters Several tornadoes hit Northwest Arkansas and the River Valley Monday evening. A tornado swept through south Fayetteville and Greenland on Monday night.

When out on an outdoor adventure, it's essential to know the signs of a potential flash flood, should you ever be stuck in one. Here is what you should do.