Dangerous wildfire smoke is impacting more than a dozen states on Saturday morning as air quality alerts span from the Upper Midwest and Great Lakes to New England, south through the Northeast and Mid-Atlantic.

More than 900 wildfires are burning across Canada, sending smoke into the Northeast and Mid-Atlantic, though a storm system moving through Saturday could help clear some of the haze.

The Midwest and Upper Great Lakes are expected to see poor air quality through the weekend as northwesterly winds push a plume of smoke into the region.

Meanwhile, the Storm Prediction Center has issued a Level 3 of 5 risk for severe storms across parts of the Ohio Valley, Northeast and Mid-Atlantic. Major cities along the Interstate 95 corridor, including New York, Philadelphia, Baltimore and Washington, D.C., could be affected. Pittsburgh, Cleveland and Buffalo are also expected to see strong storms.

The rounds of showers and storms will bring the threat of damaging winds, hail, a few tornadoes and chances for flash flooding in certain areas.

Flood watches are in effect for parts of the Northeast, including New York City and Philadelphia, through Saturday evening as heavy rainfall could trigger flash flooding.

Elsewhere, monsoonal moisture is expected to extend from West Texas and southern New Mexico into central and northern Arizona and southern Utah, where daytime heating could trigger thunderstorms capable of producing heavy rainfall and flash flooding.

A severe storm threat also extends into parts of Virginia and the Carolinas, where scattered storms could produce damaging winds and heavy rainfall as Charlotte, Raleigh and Virginia Beach are among the cities that could be affected.

ABC News’ Michelle Simmons contributed to this report.