Today

When I went down to the park this morning, it was sort of sunny but I wore my rain coat anyways and later I saw glad I did.
When I was by the science center where they caught the fish, I saw some salmon had gotten loose into a stream that went underneath the science center, but there was a block keeping the salmon out from underneath the science center.
When I was at the battle sight bench, it was low tide and I saw some sea gulls out on the beach.
When I was on the trail by the river, there were salmon in the river, and some sea gulls and shorebirds on the other side of the river.
When I was halfway to the end of the trail by the river, I saw that it had started raining so I put up my hood and was glad I did, because a minute or two later it started raining really hard.
When I got to the end of the park, it had stopped raining so I took off my hood. I was already pretty wet though.
When I was on my way back home, I saw a juvenile bald eagle flying around, and I saw some ravens and crows on sage beach.
Why did it start raining so hard so fast?
Why were the salmon in the stream?
Why were the crows and ravens on the beach?