Conservation Halton advises that a Colorado Low Pressure System is set to bring upwards of 20-25mm of precipitation on Thursday, starting mid-day, with higher local amounts possible with the presence of Thunderstorms.
High temperatures are also expected with this system, with daytime highs forecasted to be upwards of 13°C on Thursday. The unseasonably warm temperatures and the rainfall will combine to melt much of the remaining snowpack in the watershed. The rainfall from this past Sunday combined with warmer temperatures and melting snow has resulted in increased flows and water levels in many of our creeks, which are now near bankfull capacity.
Flow and water level increases are expected to continue into Friday, particularly in our larger watercourse systems (Grindstone, Sixteen Mile and Bronte Creeks). In addition, melting ice and snow may contribute to ice jamming and blockages at bridges and culverts which may lead to localized flooding.
Widespread flooding is not anticipated. Our reservoirs are still in range of our seasonal holding levels and have storage capacity available. However, fast flowing water and flooding of low lying areas and natural floodplains may be expected. Municipalities, emergency services and individual landowners in flood-prone areas should be on alert.
Conservation Halton is asking all residents and children to keep a safe distance from all watercourses and structures such as bridges, culverts and dams. Elevated water levels, fast flowing water, and slippery conditions along stream banks continue to make these locations extremely dangerous. Please alert children in your care of these imminent dangers.
Conservation Halton will continue to monitor stream flow and weather conditions and will issue further messages as necessary. This Flood Outlook Statement will be in effect through Saturday March 16th, 2019.
For further information or questions regarding this message contact:
Ben O’Reilly, Flood Duty Officer
Digital Media Coordinator