Playbooks
Cover 3 Cloud out of Nickel Wide is a three deep, four under zone shell with the corner rolling down to cloud the flat while the deep thirds are covered behind him. The diagram shows two deep outside defenders sinking to their thirds, the two inside underneath defenders (gold) sitting in curl-flat zones, a purple hook defender crashing down to the flat/curl area, and a single teal defender holding the short middle or flat. This is a zone beater killer against man concepts but is designed to squeeze flat and curl routes, so the primary read progression for an offense attacking it is to work high-low on the curl-flat combo before working back to the deep middle third if the safety bites underneath.
Pre-snap, check safety depth and corner alignment on the cloud side, if the corner is playing off and squatty near the line that confirms the cloud rotation and flat support. Post-snap, key the purple hook defender's crash to the flat, this is your primary run support and underneath flat defender against quick game and screens. This coverage shuts down hitch routes, quick outs, and flat routes to the cloud side because the corner is sitting on exactly those throws. It is vulnerable to deep comebacks and double moves against the cloud corner since he is reading run/flat first and can be beaten if he bites on a stem. Watch trips and bunch formations that overload the cloud side, since the underneath defenders can get picked or rerouted, opening the flat and seam simultaneously.
Use Cover 3 Cloud on early downs when you expect a run or a quick game passing attack to the flat, since the cloud corner is designed to jump underneath routes and support the edge.
Pre-snap, identify if the offense is in a stack or bunch look to the cloud side, since this coverage is vulnerable to quick releases that get outside the flattening corner before he can squeeze the throwing lane.
Hot route the underneath curl defenders to widen slightly if you see a heavy flood concept coming to the cloud side, this prevents easy completions in the flat and forces the quarterback to hold the ball.
Pair this call with Cover 3 Sky Press or Cover 3 Match in the same set to disguise your shell, since both start from a similar three deep look but rotate coverage responsibilities differently after the snap.
Avoid calling this on third and long against trips formations unless you have a spy or extra underneath defender, since the four man rush combined with the cloud rotation can leave deep intermediate zones exposed against stretch concepts.