Environment Canada's website carries a map showing a lot of red in southeastern B.C.
It's designed to show where there is a public weather alert of severe thunderstorms.
Meteorologists are keeping an eye on a storm crossing the U.S. border into Canada south of Trail.
"This thunderstorm is capable of producing strong wind gusts, dime to nickel size hail and heavy rain," the website states. "Large hail can damage property and cause injury."
There are warnings of possible washouts near rivers, creeks, and culverts.
"In Canada, lightning kills up to 10 people every year," Environment Canada cautions. "Remember, when thunder roars, go indoors."