A government website warns that the most serious climate-related health hazards in Massachusetts result from an increased number of very hot summer days, increased precipitation leading to flooding, increased storm-related inland and coastal flooding and rising sea levels.

Widespread showers and storms are likely to develop between 3 p.m. and 5 p.m., moving west to east. Tropical downpours with several inches of rain are possible under any thunderstorms, leading to localized flash flooding. There is also a lower-end severe weather threat with any storm, including damaging winds and large hail.

Still rather warm and a bit humid.Dangerous heat and humidity for the second half of the weekend into early next week, as new First Alert Weather Days begin. Daytime highs will return to the 90s Sunday and Monday and combined with high humidity values,

The National Weather Service has issued heat advisories for the southeastern United States. The advisories cover areas from central Florida to Virginia through the weekend.