Weather forecast for Sunday’s Indy 500 is …

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The Indianapolis 500 is a race of traditions. From “Back Home Again in Indiana” to a cold bottle of milk for the winner, there are some traditions that will forever be linked to the “Greatest Spectacle in Racing”.

Unfortunately, Mother Nature has her tradition for Memorial Day weekend in Indianapolis as well: the yearly fear of rain on race day.

Four days before the 103rd running of the Indianapolis, the current weather forecast for Sunday May 26 has a 90% chance of precipitation with thunderstorms expected, according to the Weather Channel.

However, forecasts do change as the week progresses, sometimes drastically, meaning there still is a good chance of green-flag racing action on Sunday.

THE 103RD INDIANAPOLIS 500: Click here for how to watch, full daily schedules

Should it rain Sunday, INDYCAR officials will make every reasonable attempt to run the Indy 500 on-time, with the race scheduled to begin at 12:45 p.m. ET. The Indianapolis Motor Speedway also recently used a new sealant on the track surface which makes it quicker to dry the racing surface.

So what happens if it does rain? Here are some previous examples:

Rain-shortened race

The Indy 500 could turn into the Indy 255. If more than 255 miles (102 laps) are completed in Sunday’s race, the race can be deemed official if heavy rains halt all on-track activity. If the race is called, driver’s finishing positions are based on their position in the race at the time of the caution flag for rain coming out.

The Indy 500 has been shortened by rain only seven times, most recently in 2007. The race was stopped for rain nearly three hours because of rain on Lap 113 and was declared officially over when rain once again forced the race to come to a halt at the 415-mile mark.

Partial postponement

If less than 102 laps are completed Sunday, the race will resume on the next dry day. With most Americans off-work on Monday due to Memorial Day, a partial postponement would not be the end of the world to fans at the track and watching on NBC.

The race has only been partially postponed twice in the 102 previous runnings, in 1967 and 1973.

Complete postponement

Fans shouldn’t worry too much about a complete postponement of the race, as it has only happened three times, most recently in 1997. If rain completely postpones the Indy 500, the race will be rescheduled for the next day, with start time dependent on the forecast.

The 1997 race ran 15 laps on Monday, before rains once again postponed the remainder of the race until Tuesday. The 1915 and 1986 runnings were postponed until the following Saturday.

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IndyCar teams with NASCAR on IMS road course doubleheader in 2021

IndyCar NASCAR doubleheader 2021
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The NTT IndyCar Series will be sharing Indianapolis Motor Speedway with the NASCAR Cup Series in a race weekend doubleheader for the second consecutive season, but both series will be on the road course in August 2021.

IMS announced Wednesday that IndyCar will hold an Aug. 14, 2021 race on its 14-turn, 2.439-mile road course. It’ll be a day before NASCAR’s premier series runs the same layout for the first time after the Brickyard 400 was contested on the 2.5-mile oval for the first time in 27 years.

This season’s rescheduling of the IndyCar GMR Grand Prix to July 4, 2019 (a day before the Brickyard 400) led to the first NASCAR-IndyCar doubleheader weekend. The Xfinity Series also raced on the IMS road course for the first time July 4 after the IndyCar race ended.

INDYCAR AT IMS THIS WEEKEND: Harvest GP schedule, entry lists

IndyCar will be holding its second race weekend this year at the IMS road course Friday and Saturday with the Harvest GP.

“Our first NASCAR-INDYCAR weekend was a big success last July, with positive feedback from
our loyal fans who watched the races on NBC and from the drivers, teams and participants
involved,” IMS president Douglas Boles said in a statement. “The Xfinity Series’ debut on the IMS road course provided exactly the kind of thrilling action from the green to checkered flags that we anticipated, so we know the teams and drivers of the Cup Series will put on a great show as they turn left and right for the first time at IMS.

“We can’t wait to welcome back fans to see NASCAR and INDYCAR together during this
exciting weekend as we add another memorable chapter in the long, storied history of the
Indianapolis Motor Speedway.”

It also will mark the first NASCAR Cup-IndyCar doubleheader with a crowd as fans weren’t permitted at IMS in July because of the novel coronvavirus (COVID-19) pandemic.

Over the course of Wednesday, NASCAR is releasing its 36-race slate for next season. IndyCar has yet to release its full 2021 schedule.