Flash flood warnings strike north-east US amid wildfire smoke from Canada

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Flash flood warnings have been issued across the northeastern US due to severe thunderstorms and smoke from Canadian wildfires. New York City has experienced unhealthy air quality levels as smoke returned on Saturday. The National Weather Service has placed much of the tri-state area under a level 3 risk for severe storms. In Texas, major rivers are being monitored for potential flooding after a week of heavy rainfall.