>>20743029 (LB)
This is what cloud seeding looks like on a radar. You can see to the right of pic, where there are straight line clouds happening, these clouds then spread and move with the prevailing wind direction.
In this case, the seding is being done over the ocean and drifting towards land, so that by the time these expanding clouds reach land, they are already raining. Additionally, being done over the water, allows the evaporation from the ocean be incorporated into the forming clouds.
Ionization of the air particles as the clouds move closer to land, causes the particle/droplets to stick together, allowing for larger droplets to form, until they're too heavy to be carried in the air and begin to fall as precipitation.
The second pic is the same cloud seeding event, but from the next radar site located on land, to the east of the intitial seeding event. You can see as the cloud forms and moves closer to land, the intensity of the cloud formations increases.