Researchers at Imperial College London created a model that incorporates cellphone data showing that people sharply reduced their movements after stay-at-home orders were broadly imposed in March. With restrictions now easing and mobility increasing with the approach of Memorial Day and the unofficial start of summer, the researchers developed an estimate of viral spread as of May 17…

The model, which has not been peer reviewed, shows that in the majority of states, a second wave looms if people abandon efforts to mitigate the viral spread.

“There’s evidence that the U.S. is not under control, as an entire country,” said Samir Bhatt, a senior lecturer in geostatistics at Imperial College.

The model shows potentially ominous scenarios if people move around as they did previously and do so without taking precautions. In California and Florida, the death rate could spike to roughly 1,000 a day by July without efforts to mitigate the spread, according to the report.