GRCA Flood Message #1: GRCA Watershed Conditions Statement – Flood Outlook Post-tropical storm Beryl is forecast to move through the Grand River watershed from late Tuesday, July 9, 2024 through to Thursday, July 11, 2024, bringing significant rainfall. Remnants of Hurricane Beryl are forecast to merge with an upper trough that is currently over central North America, creating a highly efficient conveyor belt of moisture into southern Ontario. Rainfall across the watershed is forecasted to be from 50 mm to 60 mm. However, there is the possibility of isolated areas receiving over 100 mm of rain. Water levels and flows are currently at their normal summer levels. The forecasted rain, combined with isolated thunderstorms with high rainfall intensities, can be expected to elevate water levels and produce significant amounts of localized runoff. …
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