Weather pattern could provide early warning for catastrophic U.S. heat waves

The emergence of a newly identified atmospheric pattern is likely to provide two to three weeks advance warning that a stifling and potentially deadly heat wave will hit the U.S., according to a new study. Since current forecasts go out no more than 10 days, the additional notice could give homeowners, farmers, electric companies and hospitals critical time to prepare for severe heat.

The precursor is a so-called “wavenumber 5” pattern, a sequence of alternating high and low pressure systems — five each — that ring the northern mid-latitudes several miles above the Earth’s surface, according the research published Sunday in the journal Nature Geoscience.