2821 will be an imp level for the day.
breaking it, nifty may fall to 2778 levels.
sustaining above 2821, we may see 2848-2873 for intraday.
also closing above 2821 may take nifty to 2925 levels in this week, where it will face strong resistence.
(60 min Intraday chart attached, All Future Levels)