High Pressure will be strengthening aloft producing sinking air and allowing for a five to seven-day stretch of temperatures at or above 90 degrees. The peak of the heat wave will likely arrive just in time for the fourth of July with temperatures rising into the mid to upper 90s Monday through Thursday.
The average high this time of year is about 86 degrees thus the DC Region will be running about 10 degrees above average for daytime highs. While a few isolated thunderstorms are possible, we are heading into a dry stretch over the next week. I’ll be watching the southeast United States coast for potential tropical development as a disturbance may try to sneak into the southeast underneath the upper-level ridge (Florida, Georgia and South Carolina bear watching between the 3 and 5 of July).