Shoreline Hazard SHORELINE HAZARD Warning Thursday, May 30, 2019 at 15:45 ▼

Issued to: SCHOOL BOARDS, MUNICIPALITIES, LOCAL CONSERVATION AUTHORITY, LOCAL POLICE, EMERGENCY SERVICES AND MEDIA

Weather Conditions: The International Lake – St. Lawrence River Board is reporting that has reached the same water levels as in 2017 and is forecasting the peak to occur in the next 1-2 weeks (depending on incoming rainfall) as inflows from Lake Erie and outflows from the lake are near equilibrium. As of May 30th, the current Lake Ontario average water level is 75.91m (IGLD 1985 Datum) at Fisheries and Oceans Canada’s tidal observation station at , which is only 2cm below the maximum observed daily water level during the entire Lake Ontario event in 2017 in Toronto (75.93m). Once peaked, water levels in Lake Ontario will then take several weeks to recede back down to normal levels. Even when water levels do start to recede, risks will continue during times of heavy wind or wave activity, which have occurred more frequently this year than during the 2017 event. Additionally, winds from the Northwest gusting up to 40km/hr are forecasted for tonight (Thursday, May 30th) and overnight, as well as winds from the Southwest up to 30km/hr gusts likely for tomorrow (Friday, May 31st). At the current lake levels any high winds from any direction can result in significant wave action and lake seiche. The shoreline hazard warning will be continued and in effect while the static water level remains above 75.5m.

Issues: Actions: Impacts to shoreline areas, such as shortened beaches, land TRCA is stressing public safety at this time. With and infrastructure erosion, trail/boardwalk closures, localized Lake Ontario level nearing its peak, combined with ponding and flooding, have been observed at, but not limited wave and seiche effects, it is imperative to obey to, the following locations; Park East, Colonel any trail closure notices. Please exercise caution Samuel Smith Park, (West and East), around all Lake Ontario shoreline areas and water Budapest Park/Sunnyside Beach, Marilyn Bell Park, HTO Park, bodies and stay away from areas that are currently , , Ontario Place, Toronto experiencing flooding and erosion. Boardwalks and Islands, , Ashbridge’s Bay Park, Kew and other pathways along Lake Ontario’s waterfront can Balmy Beaches, Bluffer’s Park, Scarborough Bluffs, along the be dangerous during times of high wind and waves. Doris McCarthy Trail and Guildwood Park shoreline, East Point Please alert any children under your care of these Park and Port Union near Highland Creek dangers and supervise their activities. Please mouth, Rouge Beach Park, Frenchman’s Bay shoreline areas, contact your local municipality 311 line for updated Rotary Park (Ajax) and Paradise Park Beach. TRCA has issued information on park and beach operations status. a notice of caution specifically for the Scarborough Bluffs due This message pertains to Lake Ontario water levels to the potential for landslides. Waterfront properties are in the TRCA jurisdiction only. This Lake Ontario encouraged to take protective measures against the high Shoreline Hazard Warning will be in effect while the water levels and wave action to minimize impacts. lake level remains above 75.5m and until cancelled Additionally, at the current lake levels any high winds from or updated. To report shoreline flooding, please any direction can exacerbate erosion and flooding impacts leave a message on TRCA's floodline listed below. If that may overtop berms and sandbags, resulting in temporary you are in danger, call 911 immediately. ponding. Due to the higher, prolonged water levels in Lake Ontario, reduced capacity of rivers and streams at river mouths, as well as ponding on low-lying roadways, can also be problematic during thunderstorms. Flood Duty Officer Chief Flood Duty Officer Cherilyn Silvestri Eric Wang 416-661-6514

Previous Flood Messages issued for the same storm event: 1. TRCA – Continuation of Lake Ontario Shoreline Hazard Warning for May 24, 2019 until updated or cancelled. 2. TRCA – Lake Ontario Shoreline Hazard Warning continued for May 16, 2019 until updated or cancelled 3. TRCA – Lake Ontario Shoreline Hazard Warning continued May 7, 2019 until updated or cancelled 4. TRCA – Lake Ontario Shoreline Hazard Warning in effect April 30, 2019 until updated or cancelled

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A Lake Ontario Shoreline Hazard Warning is a notice that critical high water levels and waves are imminent and/or occurring, which could result in shoreline flooding and/or erosion. Exercise caution around all Lake Ontario shoreline areas.