The same weather pattern that may delay the Indianapolis 500 may also trigger thunderstorms and delays for the Coca-Cola 600 at Charlotte Motor Speedway on Sunday evening.
A very busy weather pattern over the past couple of weeks will continue to trigger multiple areas of showers and thunderstorms over a large part of the central and eastern United States through the Memorial Day weekend.
"With many weather systems progressing from west to east, we cannot rule out showers and thunderstorms moving from the Appalachians to the Interstate 85 corridor of North Carolina during Sunday afternoon and evening," according to AccuWeather Chief Meteorologist Elliot Abrams.
"While spotty storms will be around at any time Sunday afternoon and evening, the bulk of the activity may be during the early evening hours," according to AccuWeather Meteorologist Rob Miller. "There could be some delays at the start (6 p.m. EDT) and/or during the first part of the race as a result."
In the unlikely event the race is postponed, there will be a continued risk of spotty thunderstorms on Memorial Day.
Sunscreen is advised for those partaking in the many pre-race activities. It is possible to get a burn even in light overcast conditions.
Temperatures are projected to be above average for late May in the Harrisburg, North Carolina, area as well as much of the Southeastern states through the weekend. Highs will be in the middle to upper 80s with moderate humidity. Temperatures will drop into the upper 60s during any downpour.
Where thunderstorms occur, there will be the potential for flash and urban flooding, strong wind gusts and frequent lightning strikes.
People should seek shelter indoors or in a vehicle at the first rumble of thunder. Tents, canopies and picnic pavilions do not offer adequate protection from lightning.
For those camping in the Appalachians to the west, there will be an elevated risk of flash flooding this weekend. Avoid setting up camp in low-lying areas along small streams. A thick forest offers lower risk from a lightning strike as opposed to a large open area.