Tornado Valley isn't a disaster film as much as it is a study of trauma and relationships. So if you leave your expectations of action at the door, you'll enjoy this made-for-TV movie more.
The film was shot in scenic British Columbia, Canada, primarily with a cast of actors experienced in television work. While the acting was better than I would expect, the extremely beautiful Christine Chatelain gives a standout performance as Helen (which she's oddly uncredited for).
For only having a handful of movies under his belt, I thought Canadian director Andrew C. Erin did a good job with the film. The CGI effects for the tornadoes are low quality, though the set design otherwise makes up for it. Kevin Blumenfeld did a terrific job with the score, which has a real "American Beauty" feel to it.
Considering this movie was made for television, don't expect extravagant special effects; you're only getting two big twisters throughout the entire film. There's no pulse-pounding tension throughout the film, it's essentially a well-acted drama that's framed with two major twisters. I enjoyed it: Four stars as far as TV movies go, three stars if comparing it to blockbusters like Twister.