I haven't seen enough history to know if that's normal or not, but I can tell you that the center of each of those blue "clouds" is a nexrad radar station. It's view is a wide cone from the ground upwards (technically a set of cones from each of the radar's tilt angles).
It's quite possible there is some lower altitude fog/precipitation/something that is only visible to the radar at it's lower tilt angles. But that's just speculation.
One of my weird hobbies is radar chasing storms, and all of that stuff is completely normal. NEXRAD is very sensitive, especially when it's in clear air mode (it has different modes depending on if it's raining in the area) and can pick up things like dust, birds, bats, and insects. There's also ground clutter from things like buildings, wind farms, and even cars.
These are base reflectivity images. Composite reflectivity products reduce the noise from around the radar stations. The old NWS Java site used to let you select between them. Raw base images seem to be unavailable on the modern moving maps.
It's quite possible there is some lower altitude fog/precipitation/something that is only visible to the radar at it's lower tilt angles. But that's just speculation.