Millions of Americans don’t speak English. Now they won’t be warned before weather disasters.

When an outbreak of deadly tornadoes tore through the small town of Mayfield, Kentucky, in December 2021, one family was slow to act, not because they didn’t know what to do. They didn’t know that they should do anything.

The family of Guatemalan immigrants only spoke Spanish, so they didn’t understand the tornado alert that appeared on their cell phones in English. “I was not looking at [an information source] that told me it was going to get ugly,” Rosa, identified only by her first name...