Cooler weather welcomed in Canada's fire-stricken energy heartland

By Eric M. Johnson and Nia Williams CALGARY (Reuters) - Firefighters battling a massive blaze in Canada's energy heartland were aided on Friday by a second day of light rain and winds that held flames back from oil sands facilities, as producers signaled a gradual increase in operations. The wildfire in northern Alberta has blackened more than 500,000 hectares (1,930 square miles) of land, six times the size of New York City, since it erupted earlier this month. It has forced widespread evacuations, destroyed entire neighborhoods in the Fort McMurray area and triggered a prolonged shutdown that has cut Canadian oil output by a million barrels a day. The fire's footprint had already exceeded the total area burned during Alberta's entire 2015 fire season, and it jumped Thursday into the neighboring province of Saskatchewan although no evacuations were ordered there so far. The fire's growth slowed on Friday as firefighters were helped by colder, damper weather that began a day earlier and vastly improved air quality, provincial authorities said. "We expect to hold this fire in place over the weekend," Alberta Wildfire Manager Chad Morrison told a news conference. Morrison said that fire crews hope to use the improved conditions to advance further against the blaze. Authorities plan to roughly double the number of firefighters over the next two weeks to about 2,100 personnel backed by bulldozers and aircraft dumping flame retardant. CAUTIOUSLY OPTIMISTIC The weather, which included winds pushing flames away from key oil sands assets, offered a glimmer of hope for crude operations with Statoil saying on Friday its Leismer project was producing 13,000 bpd, up from 9,000 bpd two days prior. Imperial Oil has said it had restarted limited operations at its Kearl site, with a capacity of 194,000 bpd. A ConocoPhillips Canada spokesman said the company was "cautiously optimistic" but gave no time frame on restarting operations. Still, many operations remained shut due to the blaze, which comes on the back of a two-year slump in global crude prices. Syncrude told customers to expect no further crude shipments for May, trading sources said on Thursday. On Friday, officials said the Suncor and Syncrude oil sands sites remained under mandatory evacuation orders along with 19 work camps north of Fort McMurray. Some of the 90,000 evacuees who fled as the massive blaze breached Fort McMurray earlier this month may be allowed to return as soon as June 1, if air quality improves and other safety conditions are met. POOR AIR QUALITY Officials warned residents with asthma or heart conditions that medical care will be limited in the early days. "There have been extreme fluctuations in the air quality not only in Fort McMurray, but also in the surrounding areas," Dr. Karen Grimsrud, Alberta's chief medical officer told reporters on Friday. Among those eager to return was Abdurrahmann Murad, a 38-year-old religious leader, who said the rain had brought some relief to the community. "The rain has been falling, and we pray to God (the fire) doesn't come back toward the city," Murad said by telephone. (Additional reporting by Ethan Lou in Toronto; Editing by Clarence Fernandez and Cynthia Osterman)