DISCUSSION: As another hot day begins to slowly wind down across many parts of the Eastern United States, the worst appears to be just beginning based on the fact that over the next few days there will be persistent warm air advection out of the southeastern to south-central United States which will aid in the regeneration of sufficiently hot temperatures to warrant the issuance of the Heat Advisory discussed below! It is important to note that a heat advisory is issued when the forecast includes the likely potential for temperatures to reach the lower to middle 90s with associated heat index values close to or possibly in excess of 100°F in many places.
The primary factors which were helping to produce this persistent heatwave across much of the Central and Eastern United States is the combination of a slow moving low-pressure system across the northern tier of the country as well as a persistent subtropical high-pressure system positioned between the Eastern United States and the Western Atlantic Ocean. The combination of the low-pressure system's and the high-pressure system's position has aided in a persistent and strong warm air advection regime which has favored particularly hot temperatures across much of the eastern two-thirds of the nation for several days now. Having said that, keep in mind that dehydration and heat exhaustion can set in well before you begin to feel thirsty so continue to remain hydrated and where light colored clothing as you head out and as expressed in any current National Weather Service office forecast pertaining to this upcoming and persistent heat wave. To learn more about other high-impact weather events from across North America, be sure to click here!