Flood Forecasting and Warning Program
Information about the Flood Forecasting and Warning Program, which prepares provincial and local authorities in the event of a flood.
Current flood information
Flood information updated as of: April 24, 2018 - 10:00 am
Ontario flood map
Provincial Flood Watch for Southern Ontario and southern sectors of Northern Ontario issued by the Surface Water Monitoring Centre of the Ministry of Natural Resources and Forestry on Tuesday April 24, at 10:00 AM
Locally issued flood messages
Issued by MNRF Districts and Conservation Authorities
- Cataraqui Region - Watershed Conditions Statement – Flood Outlook - April 17, 2018
- Central Lake Ontario - -
- Credit Valley - Watershed Conditions Statement – Water Safety - April 24, 2018 3:10 pm
- Crowe Valley - Watershed Conditions Statement – Water Safety - April 13, 2018 12:00 pm
- Essex Region - Watershed Conditions Statement – Flood Outlook - April 24, 2018 11:30 am
- Grand River - Watershed Conditions Statement – Water Safety - April 20, 2018 12:30 pm
- Hamilton Region - Watershed Conditions Statement – Water Safety - April 23, 2018 4:30 pm
- Kawartha Region - Watershed Conditions Statement – Water Safety - April 24, 2018 1:30 pm
- Kettle Creek - Flood Watch - April 14, 2018 3:00 pm
- Lakehead Region - Watershed Conditions Statement – Flood Outlook - April 23, 2018 4:30 pm
- Lower Trent - Flood Watch - April 23, 2018 11:00 am
- Maitland Valley - Watershed Conditions Statement – Water Safety - April 22, 2018 10:00 am
- Mississippi Valley - Watershed Conditions Statement – Water Safety - April 19, 2018
- Nickel District - Watershed Conditions Statement – Water Safety - April 23, 2018 11:00 am
- Otonabee Region - Flood Warning - April 24, 2018 2:00 pm
- Quinte - Watershed Conditions Statement – Flood Outlook - April 18, 2018
- Rideau Valley - Watershed Conditions Statement – Flood Outlook - April 18, 2018
- Sault Ste. Marie Region - Watershed Conditions Statement – Water Safety - April 20, 2018 11:00 am
River Regulatory Agencies
- Parks Canada - Trent Severn - Water Level Management Update - April 24, 2018
Issued to Local Authorities by the Surface Water Monitoring Centre
Algonquin Park, Aurora, Aylmer, Bancroft, Guelph, Kemptville, Midhurst, Nipigon, North Bay, Parry Sound, Pembroke, Peterborough, Sault Ste. Marie, Sudbury, Thunder Bay, Wawa
Ausable Bayfield, Cataraqui Region, Catfish Creek, Central Lake Ontario, Credit Valley, Crowe Valley, Essex Region, Ganaraska Region, Grand River, Grey Sauble, Halton Region, Hamilton Region, Kawartha Region, Kettle Creek, Lake Simcoe Region, Lakehead Region, Long Point Region, Lower Thames Valley, Lower Trent, Maitland Valley, Mississippi Valley, Niagara Peninsula, Nickel District, North Bay Mattawa, Nottawasaga Valley, Otonabee Region, Quinte, Raisin Region, Rideau Valley, Saugeen Valley, Sault Ste. Marie Region, South Nation River, St. Clair Region, Toronto and Region, Upper Thames River
A low-pressure system is set to traverse the province, Wednesday into Thursday, and bring along with it rainfall and continuous warm weather for much of the province. Cumulative rainfall of 20 to 35 mm is forecast for the two days in the Southern Region with higher amounts forecast in Southcentral/Southeast Ontario. Daytime temperatures are expected to remain between 5 to 15+ ᴼC in the Southern Region and between 5 to 10 ᴼC in the Southern sectors of the Northern Region. Nighttime temperature will also remain between 0 to 5+ ᴼC in the regions for the forecast period.
Stream flow and levels across the forecast region are moderately elevated as a result of ongoing freshet operations combined with recent snow melt associated with the current warm weather conditions.
Snowpack remains across the Province with the exception of extreme southwestern and southeastern parts of the Province. Snow surveys conducted April 16th and 17th recorded approximately 30 to 50mm of water equivalent across most of southern Ontario and approximately 80 to 200mm of water equivalent across central Ontario and Northern Ontario. Local reports indicate that snow is ripe across most of the forecast area and ready to release water content.
Forecast rainfall on Wednesday into Thursday combined with snowmelt has the potential to cause localised flooding in south central and southeast Ontario in areas where stream flows are already high due to ongoing snow melt and freshet. A close watch on conditions across central, eastern and Southern sectors of Northern Ontario is recommended as the ripe snowpack and warmer temperatures in the forecast may result in the quick increase of stream flows and levels.
A close watch on updated forecasts, meteorological conditions, as well as river flows and ice-jam prone areas, is recommended.
This message will remain in effect until 5pm, Friday April 27th, 2018 unless updated earlier.
Flood Message Definitions
Provincial flood messages
There are 2 types of provincial flood messages:
- the Provincial Flood Watch, which provides consistent and timely technical information about the potential for flooding
- the Provincial Watershed Conditions Statement, which provides information on provincial watershed conditions as they relate to flood potential, and an outlook on expected spring flood conditions
Local flood messages
There are 3 types of local flood messages:
- flood warning: flooding is imminent or already occurring
- flood watch: there is the potential for flooding
- watershed conditions statements: flood Outlook (an early notice of the potential for flooding based on heavy rain, snow melt etc.) and water safety information.
Who to contact for flood information
Your local Conservation Authority is responsible for local flood messaging.
Your local municipality is responsible for on-the-ground flood response.
If you live in a community that is not serviced by a conservation authority, any flood watches or flood warnings in your area are issued by the nearest Ministry of Natural Resources and Forestry district office.