That’s weird. I wonder if they weren’t paying attention to the tower, or vice-versa...
Watsonville is an uncontrolled airport (no tower). Plots communicate their intentions on the “Unicom”/”CTAF” radio frequency.
https://www.airnav.com/airport/KWVI
https://www.airnav.com/airport/KWVI
Lots of ways for this to happen - one plane using the wrong traffic pattern direction (although both runways are published as left traffic).
There would have been a big speed differential between the C-150 and a twin - the twin could have run him over. Also altitude mismanagement. Or a combination. Ya just never know.
It always gets a little more tense around an uncontrolled airport.
What tower?
This is an uncontrolled airport so all approaches are done using a local Unicom advisory frequency. The normal procedure is to report downwind, base, and final. If one or the other pilots was not familiar with the airport they may have not been monitoring the frequency.
If I had to guess this is a classic low-wing meets high-wing collision. The high-wing 152 pilot can’t see directly above his wing and the low wing 340 can see below. If the 340 came in high and fast he may have never seen the 152 below him if they were both on final. Just a guess but the 152 pilot may have been a student on a solo and did not report his final approach.
The Cessna 152 is a trainer aircraft. The pilot was probably a very low time person.
Airport doesn’t have a control tower.