The town was devastated by severe flooding 10 weeks ago and many people still have not been able to return to their homes.
Environment Canada says it's possible the area south of Calgary could get up to 50 millimetres of rain beginning Friday.
The town of High River is to receive regular updates from river forecasters.
Debris removal from underneath two bridges in the town has begun to increase the capacity of the Highwood River that runs through the community.
Residents are also being encouraged to have 72-hour preparedness kits ready just in case.
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