The Ausable-Bayfield Conservation Authority has posted its third high water safety bulletin in a little more than a week because of milder weather.
ABCA Water and Planning Manager Alec Scott says the weekend weather forecast makes it difficult to anticipate the effects on rivers and streams.
Temperatures are expected to get as high as plus-five by the weekend before more cold air moves in.
ABCA officials say rainfall could total anywhere between 20 and 50 millimetres by tomorrow evening.
Scott says the rapid succession of mild and cold weather trends is a challenge for Authority staff.
He says milder weather coming through every few days carries the possibility of rain.
Concern has been raised about a quick snow-melt and possible ice-jams that could cause flooding in low-lying areas.
Scott reminds us that outlets to Lake Huron in Bayfield and Port Franks are especially vulnerable to ice-jams.
He doesn't anticipate conditions that might lead to an ice-jam in Bayfield harbour yet.
Again, residents are reminded that ice on rivers and ponds should be considered unsafe and that children and pets should not be allowed to play near slippery river and stream banks.