It could be a soggy couple of days for the region.
Environment Canada has issued a rainfall warning for London and area as we could see up to 75 mm by Wednesday.
Several conservation authorities have issued flood warnings, including Upper Thames River Conservation Authority (UTRCA) and the Kettle Creek CA.
Some of the most upstream areas are showing indication of peaking late Tuesday afternoon or early evening.
Peak levels are expected to occur in upstream areas such as Mitchell, Stratford, St. Marys, Woodstock, and Ingersoll Tuesday night, and will arrive in London Wednesday morning.
According to the UTRCA, flood levels will be higher than those experienced in 2008 and 2009.
The UTRCA says the watershed has already received an average of 20 mm of rain, forecasts are calling for an additional 20 mm to 40 mm over the next 36 hours.
Residents should stay away from all bodies of water.
A boating ban is in place on the Thames River until the end of the week.
The City of London is reminding homeowners to prepare for and protect against basement and yard flooding.
• If you have a backwater valve and/or sump pump, ensure they are in good working order and are operational during this time
• Keep your drains unobstructed – do not pour grease down the drain or flush objects down the toilet
• Throughout the year take a look around your property to make sure the ground is sloping away from your house and downspouts are extended four to six feet away from the house. Direct your downspouts where water can be easily absorbed, such as your lawn or flower bed.
• Inspect your basement walls and floor for cracks.
