I aggree with offshoreheli, there is no excuse for inadvertant IMC by day.
If you can't reach your destination by taking another route to it, divert, return to where you came from or land. If you end up flying lower due to cloud base, slow down obviously there are limits (Pilot experiance, area, terrain, noise complaints etc)
I think the pilot of the 120 was very very lucky not to of became the next CFIT.