From Ontario Tornado Watch:

2:03p Onshore Flooding Discussion (custom alert issued by InstantWeather):

(Locations listed below description)

Valid Friday and Saturday (2017-05-05 to 2017-05-06)

Summary: A combination of a raw Easterly or ENE on shore wind, near record high lake Ontario water levels of 55cm, significant rainfall, and onshore waves of 1-2 meters will lead to beach erosion and flooding along the shoreline of Lake Ontario. Some perhaps significant. Rainfall totals of 40-70mm widespread; local amounts approaching 100mm.

Discussion: A moisture laden Texas low has already began moving into Southern Ontario. Current model guidance suggests a significant swath of rainfall stretching from SW ON through the GTA with widespread amounts of 40-70mm. Local amounts may approach the 100mm mark in a few locales. Raw easterly winds combined with an extended period of moderate (to at times heavy) rainfall, on shore waves of 1-2 meters, and the highest Lake Ontario water level since 1993 (55cm) will lead to onshore flooding and beach erosion. After this weekend Lake Ontario will likely exceed 1993 levels. This event will be significant enough to change some of the landscape around the shores of Lake Ontario. Including downed trees and washed out greenery. Especially along beaches, parks and lower terrain.

Onshore flooding discussions are Issued in advance of non-convective (thunderstorm) events that may produce heavy rainfall, beach erosion and flooding. Pay attention to our Social media feeds, Environment Canada alerts, and your local water authority for further updates. Avoid walkways and beaches in lakefront areas. Waterways and tributaries across the affected watersheds will be running high and fast. Remember turn around don’t drown!

Locations which may be affected:

- Abingdon
- Adolphustown
- Ajax
- Albion Falls
- Albury
- Aldershot
- Alderwood
- Allanburg
- Allen’s Corners
- Allisonville
- Ameliasburg
- Ancaster Heights
- Appleby
- Applewood Acres
- Ash
- Athol
- Baby Point
- Baltimore
- Barcovan Beach
- Barnesdale
- Bartonville
- Basingstoke
- Bayside
- Bayview
- Beamsville
- Beaver Dams
- Bendale
- Bennington Heights
- Bethel
- Binbrook
- Birch Cliff
- Birchmount Park
- Birchwood
- Black Creek
- Black Horse Corner
- Blackheath
- Bloomfield
- Bongard
- Bongard Corners
- Bowermans
- Bowmanville
- Braeheid Survey
- Brant Hills
- Bridgeview Survey
- Brighton
- Brock Gardens
- Bronte
- Brookside
- Buchanan
- Bullocks Corners
- Burlington
- Burlington Beach
- Burr
- Cabbagetown
- Caistor Centre
- Caistorville
- Camborne
- Campden
- Cankerville
- Canton
- Carlton Park
- Carman
- Carmel
- Carrying Place
- Castle Green
- Castleton
- Cedar Creek
- Cedar Dale
- Cedarvale
- Centennial
- Central
- Centre
- Centreton
- Charnwood
- Chedoke Park
- Cherry Heights
- Cherry Valley
- Cherrywood Acres
- Clairlea
- Clappison’s Corners
- Clarke
- Clarksdale
- Clarkson
- Clearview
- Clearview Estates
- Cliffcrest
- Cliffside
- Clifton
- Cobourg
- Colborne
- Cold Springs
- Colemans
- Community Beach
- Consecon
- Cooksville
- Cootes Paradise
- Corktown
- Corwin Crescent
- Courtice
- Cove Beach
- Coverdale
- Creighton Heights
- Crescent Town
- Crofton
- Crooked Creek
- Dale
- Dancaster Courts
- Davidson’s Corners
- Davisville
- DeCew Falls
- Decker Hollow
- Deer Park
- Demorestville
- Don Mills
- Don Vale
- Dorland
- Dorset Park
- Drummond Heights
- Dunbarton
- Dundas
- Dundonald
- Dynes
- East Colborne
- East York
- Eddystone
- Edville
- Effingham
- Elfrida
- Elizabeth Gardens
- Ellesmere
- Elmbrook
- Ennisclare Park
- Erindale
- Erindale Woodlands
- Facer
- Fairport
- Fairport Beach
- Falgarwood
- Falls View
- Fawcettville
- Fenwood Gardens
- Flemingdon Park
- Forest Hill
- Freeman
- Fruitland
- Fulton
- Gardenville
- Garners Corners
- Gaud Corners
- Gilbert Mills
- Glanford Station
- Glen Grove
- Glen Leven
- Glenora
- Glenorchy
- Glenridge
- Glenwood Heights
- Glenwood Park
- Gosport
- Grafton
- Grantham
- Grassie
- Greenleys Corners
- Greens Corners
- Greenside Acres
- Greensville
- Griffis Corners
- Grimsby
- Grimsby Beach
- Grimsby Centre
- Guildwood Village
- Hallowell
- Hamilton
- Hamilton Beach
- Hampton Heights
- Harmony
- Harmony Hall II
- Henley
- High Park
- Highland Creek
- Highland Park Survey
- Highview Survey
- Hillcrest
- Hillier
- Hilton
- Holton Heights
- Homer
- Hopkins Corners
- Hopkins Court
- Hopkins Survey
- Hubbs
- Huff’s Corners
- Humber Bay
- Humberside
- Inch Park
- Indian Point
- Ionview
- Jordan
- Jordan Harbour
- Jordan Station
- Kennedy Park
- Kent Gardens
- Kimbo
- King’s Forest
- La Salle
- Lake on the Mountain
- Lakeport
- Lakeview
- Lakeview Park
- Leaside
- Leckie Park
- Lincoln
- Liverpool
- Long Branch
- Longmoor
- Lorne Park
- Lorne Park Estates
- Loughbreeze
- Lovett
- Lundy’s Lane
- Malvern West
- Maple
- Maple Grove
- Maple Lane
- Maple Lane Annex
- Marsdale
- Martindale Heights
- Maryvale
- Maywood
- McDonald Court
- McNab
- Meadow Wood
- Melville
- Merritton
- Milford
- Mimico
- Mimico Beach
- Mississauga Beach
- Mitchell’s Corners
- Mohawk Meadows
- Montebello
- Moore Park
- Morrish
- Mount Albion
- Mount Hope
- Mountain Gardens
- Mountain View
- Mulhern
- Nakoma
- Nelles Estates
- Nelson
- New Toronto
- Newcastle Village
- Newtonville
- Niagara Falls
- Niagara Falls Centre
- Niagara Falls South
- Niagara Gardens
- Niagara-on-the-Lake
- Niles Corners
- Normanhurst
- North End
- North Glanford
- North Pelham
- Oakhill
- Oakridge
- Oakville
- Oakwood
- Old Glenridge
- Old Mill
- Orchard
- Orchard Heights
- Orchard Park
- Orono
- Osaca
- Oshawa
- Palermo
- Palmer
- Park Royal
- Parkdale
- Parkview Heights
- Parkview Hill
- Parkway East
- Pelham
- Pelham Union
- Perrytown
- Perth Park
- Pickering Beach
- Pickering Village
- Picton
- Pinecrest
- Pleasant Valley
- Pleasant View Survey
- Port Britain
- Port Credit
- Port Dalhousie
- Port Darlington
- Port Granby
- Port Hope
- Port Milford
- Port Nelson
- Port Union
- Port Weller
- Port Weller East
- Port Whitby
- Power Glen
- Precious Corners
- Presqu’ile Point
- Prince Edward
- Purdy Corners
- Queenston
- Queensway Gardens
- Rattray Park Estates
- Rednersville
- Regent Park
- Renforth
- Ridley Heights
- Riverdale
- Riverside
- Rock Chapel
- Rockcliffe Survey
- Rockway
- Rosebank
- Rosebank Station
- Rosedale
- Rosedene
- Rosehall
- Roseland
- Rossmount
- Rouge
- Rouge Hill
- Rouge Park
- Royal
- Ryckmans
- Ryckmans Corners
- Ryderville
- Salem
- Salmon Point
- Sand Banks
- Scarborough
- Scarborough Village
- Scott
- Shep
- Sheridan Homelands
- Sheridan Park
- Sherwood Forrest
- Shiloh
- Shipman
- Shoreacres
- Silverdale
- Sinclairville
- Smithfield
- Smithville
- South Bay
- Southcote
- Spring Valley
- Springvale
- Squires Beach
- St. Anns
- St. Catharines
- St. Davids
- St. James Town
- St. Johns
- Stamford
- Stamford Centre
- Starkville
- Stoney Creek
- Strathcona Gardens
- Sunningdale
- Sunnyside
- Swansea
- Tansley
- Tapleytown
- Taunton
- The Annex
- The Beaches
- The Delta
- The Golden Mile
- The Gully
- The Junction
- The Outlet
- Thorncliffe
- Thorold
- Thorold Park
- Thorold South
- Thorton Woods
- Tintern
- Trafalgar
- Trenton
- Tubbs Corners
- Turners Corners
- Tweedside
- Twelve O’Clock Point
- Tyandaga
- Tyneside
- University Gardens
- Vernonville
- Victoria
- Victoria Beach
- Victoria Village
- Vineland
- Vineland Station
- Vinemount
- Virgil
- Wade Corners
- Warings Corner
- Waterdown
- Waupoos
- Waupoos East
- Waupoos Island
- Welcome
- Weller Park
- Wellington
- Wesleyville
- West Flamborough
- West Hill
- West Lake
- West Lynde
- Westdale
- Western Hill
- Wexford
- Wexford Heights
- Wicklow
- Wilcox Corners
- Winona
- Winona Park
- Woburn
- Woodbine Gardens
- Woodbine Heights
- Woodburn
- Woodrous
- Woodville
- Wychwood Park
- Yerexville
- Yorkville
- Zimmerman
- Zion