The front moving into the Seattle area is likely a cold front. Cold fronts typically bring a drop in temprature as they advance, leading to cooler and often wetter weather conditions. As a result, the current temprature in Seattle is expected to decrease as the cold front moves through.
The storm moving over the Seattle area is caused by a low-pressure system associated with this cold front. Cold fronts are known to create stormy weather and can result in precipitation, including rain, which is common in the Seattle region.