Overview
- National Weather Service meteorologists said Sunday that scattered showers were increasing across Indiana and that rain chances could peak in the early to mid-afternoon, roughly around 3–4 p.m., leaving the scheduled 12:45 p.m. start uncertain.
- The NWS upgraded its probability for Sunday to about 70 percent after forecasts shifted from a morning window to a broader morning-to-afternoon threat, and forecasters previously highlighted the best early chance for showers near 10 a.m. to noon.
- Private providers diverged sharply on odds and timing, with AccuWeather showing very high rain probabilities near race time and Weather Underground projecting much lower chance of precipitation, complicating planning for teams and broadcasters.
- Indianapolis Motor Speedway has deployed jet dryers and contingency plans because IndyCars cannot race on a wet oval; track drying can take about 90 minutes in good conditions but may require much longer if humidity or lingering showers persist.
- The uncertain forecast affects about 300,000 spectators, team travel and TV windows and keeps the option open to postpone the race to Monday if weather prevents a safe, timely run on Sunday.