If the number of new cases continues to grow, the report suggests the province may see 200 to 300 COVID-19 patients per day in ICU beds.
Meanwhile, health officials in Ontario continue to record numbers of new COVID-19 infections at levels unseen since April.
Health Minister Christine Elliot says Ontario is reporting 625 cases of COVID-19 today as almost 35,800 tests were completed.
Of the new cases confirmed on Wednesday, more than three-quarters of them (484) are in the GTA, including 288 in Toronto, 97 in Peel Region, 41 in York Region, 25 in Durham Region and 33 in Halton Region.
She said 60 per cent of the new cases are among people under the age of 40.
Health officials in Ontario are out with stark new COVID-19 predictions.
Three more Ottawans have died after contracting COVID-19, Ottawa Public Health reported Tuesday, bringing the city's death toll to 285.
"We believe it's a critical time right now".
Covid-19 Latest: 430 new cases including more than 50 in Cork
A total of 1,062 cases have been recorded in Flathead County to date including 639 recoveries and 17 deaths. The COVID-19 Dashboard provides up-to-date information on the key indicators of COVID-19 in the community.
Premier François Legault also announced on Wednesday that recently imposed measures, including banning most guests in private homes and requiring protesters to wear masks across large swaths of the province, will be enforced with on-the-spot $1,000 fines.
"We don't want to turn back a stage unless we absolutely have to but if we do have to, we will", Elliott insisted. There are now 4,955 active cases province-wide.
One in four Ottawans who tested positive for COVID-19 in the first two weeks of September were exposed to the virus at social gatherings with people outside of their households. The province declared 700 new cases today, after a string of days in the 400s.
Intensive Care Unit (ICU) occupancy is now steady, but it is predicted that admissions will likely rise with an increase in COVID-19 patients being hospitalized. There are 35 COVID patients in intensive care units and 17 of those patients are on ventilators.
But despite mounting pressure from some health-care professionals to move Ontario back to Stage 2, Ford said the province isn't ready for that yet.
Estimates of daily testing being done at assessment centres, long-term care homes and in the community in Ontario East, compared to lab capacity "indicates a need to reduce overall swabs by approximately 1,215 a day".
The shifting demographics of who's getting infected with COVID-19 as the second wave builds makes it challenging for the researchers to forecast just how many people will need hospital treatment. "We lost thousands of employees over the course of the pandemic for a range of reasons, certainly fear was one of them", Duncan said.