Air quality statement in effect, thunderstorms possible this afternoon
As wildfire smoke blankets Ontario and eastern U.S., causing hazardous air quality and hazy skies, smoke in the Forest City is expected to remain until at least Thursday night.
According to CTV News London’s Meteorologist Julie Atchison, a large area of low pressure over the Canadian Maritimes and a blocking ridge over central North America is allowing a steady flow of northerly air to usher in smoke from forest fires in Northern Ontario and Quebec.
Air quality and visibility will vary from county to county, and air quality conditions could change quickly throughout the day Thursday.
London has not received any rain in over more than two weeks, but Atchison said there is the chance of rain Sunday and Monday.
It has been extremely dry and rainfall is desperately needed, Atchison added.
A pattern shift will be underway this weekend, and winds will shift Saturday improving air quality in Ontario.
Environment Canada advises residents that wildfire smoke may cause negative health effects, and people with lung or heart disease, pregnant people, older adults, children and people who work outdoors are advised to take extra caution.
Here’s a look at London’s upcoming forecast
Thursday: Cloudy. 30 percent chance of showers this afternoon. Risk of a thunderstorm late this afternoon. Widespread smoke. High 22 C. UV index 5 or moderate.
Thursday Night: Mainly cloudy. 30 per cent chance of showers this evening. Risk of a thunderstorm early this evening. Widespread smoke. Low 9 C.
Friday: A mix of sun and cloud. High of 20 C.
Saturday: A mix of sun and cloud. High 24 C.
Sunday: Cloudy with 40 per cent chance of showers. High 19 C.
Monday: Cloudy with 40 per cent chance of showers. High 20 C.
Tuesday: A mix of sun and cloud. High of 22 C.
CTVNews.ca Top Stories

Murder charge laid in killing of B.C. Mountie
The day after an RCMP officer was killed and two others were injured while executing a search warrant in Coquitlam, B.C., charges of murder and attempted murder have been laid.
Sikh groups ask Canadian political parties to present 'united front' against India
Two groups in the Canadian Sikh diaspora are calling for Canada's political parties to "present a united front" on India after Prime Minister Justin Trudeau announced a "potential link" between the shooting death of a local leader and the Indian government.
A Black student was suspended for his hairstyle. Now his family is suing Texas officials
The family of a Black high school student in Texas who was suspended over his dreadlocks filed a federal civil rights lawsuit Saturday against the state's governor and attorney general, alleging they failed to enforce a new law outlawing discrimination based on hairstyles.
Moneris says systems back online after users across Canada report outages affecting debit, credit payments
The payment processing company Moneris says it has resolved an outage that appeared to affect debit and credit transactions across the country.
EXCLUSIVE 'Shared intelligence' from Five Eyes informed Trudeau's India allegation: U.S. ambassador
There was 'shared intelligence among Five Eyes partners' that informed Prime Minister Justin Trudeau's public allegation of a potential link between the government of India and the murder of a Canadian citizen, United States Ambassador to Canada David Cohen confirmed to CTV News.
Manitoba could make history by electing first First Nations premier to lead province
A First Nations premier would head a province for the first time in Canadian history if the New Democrats win the Oct. 3 Manitoba election, and the significance is not lost on party leader Wab Kinew.
Canada's international student program faced with 'integrity challenges,' senators say in push for reform
A group of Canadian senators is proposing a series of reforms to the country's international student program that include ways of protecting newcomers from fraud and abuse, as well as greater regulations and penalties for recruiters and educational institutions.
B.C. Mountie's death reverberates across law enforcement community
The death of a Metro Vancouver RCMP officer who was shot dead while executing a search warrant is reverberating with law enforcement officials across the country.
Smoke prevents Yellowknife from holding welcome home celebration
Smoke has forced Yellowknife to cancel a celebration marking the return of residents to the city after a wildfires-prompted evacuation that lasted for weeks.