Thursday begins on a very warm and smoky note across most of Western Pennsylvania and Northern West Virginia. Wildfire smoke and haze have mixed down to this surface, resulting in code yellow to code orange air quality, meaning that the condition of the air is unhealthy for those with any underlying health conditions.

Smoke from Canadian wildfires is once again blanketing the skies of Western Pennsylvania. More smoke is forecast to blow in Tuesday through early Wednesday.Lofted wildfire smoke is nothing new. Several plumes have tracked across our region over the past few summers.

The National Weather Service has issued a "hazardous weather outlook" for the Pittsburgh area beginning Tuesday, due to the chance of haze and poor air quality from Canadian wildfire smoke.