Heat is the deadliest weather threat, according to the National Weather Service’s report on weather-related fatalities. Here's how to stay safe.

Forget about any worries of tropical weather today. Instead pay attention to the heat: temperatures in Jacksonville could feel as high as 113 degrees.

Lehigh and Northampton counties, as well as neighboring Bucks and Berks counties, will be under a heat advisory from 10 a.m. until 8 p.m. In the Lehigh Valley, a high of 92 is expected, but forecasters said it will feel closer to 102.

Thursday: A slight chance of showers and thunderstorms, mainly between 4 and 5 p.m. Mostly cloudy, then gradually becoming sunny, with a high near 93. Heat index values as high as 102. West wind 5 to 10 mph. Chance of precipitation is 20%.

A flood watch has also been issued in Washington, D.C., while the Midwest also has the potential for flooding.

On Wednesday at 6:47 a.m. a heat advisory was released by the National Weather Service in effect until 10 p.m. for Lower Columbia River, Tualatin Valley, West Hills and Chehalem Mountains, Inner Portland Metro,