Tropical Storm Polo in the Pacific Ocean is expected to rapidly intensify and become a major hurricane later this week, according to forecasters. One outlet also reports Polo has rapidly intensified into a hurricane, while others describe the storm’s anticipated progression toward major-hurricane strength.

Forecasters base the outlook on guidance from the U.S. National Hurricane Center, which describes rapid intensification in the Pacific as the system develops. Sources frame the timing as later in the week and indicate the storm’s potential to strengthen quickly rather than gradual changes.

While all accounts focus on the same forecast, they differ slightly in emphasis: some lead with the expectation of Polo reaching major hurricane status, whereas PBS NewsHour additionally notes that Polo is already a hurricane and highlights the likelihood of impacts for Mexico as the system strengthens.