While both of these games have a greater than 10% chance of raining, they represent different game-time conditions. The Titans-Browns clash in Cleveland indicates a 15% chance of rain but less than .001 inches of precipitation. Think of a mist or light drizzle.
On the other hand, Seattle has a nearly 45% chance of raining and forecasts .02 inches of rain per hour. That’s considered to be light rain by the National Weather Service. Neither are enough to change my assessment of either game, but they are worth noting for clarification. That's borne out in the data.