One disaster film I watched last month is The Swarm, a 1978 film directed by Irwin Allen. It's gets a low rating at IMDB and at "Rotten Tomatoes" and while I think the movie itself takes itself a little too seriously at times I also find it quite entertaining. The Swarm is "nature gone amok" fare: in the movie "Africanized" bees are on the move and transit into the southwestern United States including Texas where the movie's primary action takes place. The bees are aggressive and attack anyone who disturbs them and also those who don't. The marauding bees in The Swarm have an unusually toxic sting which rivals the bite of a cobra so the body count from the bee attacks is of course very high.
While I wouldn't rate the special effects overall as grand they are suitable and the slow motion shots of the bees swarming and attacking their human victims is well rendered. The all star cast includes Michael Caine, Katharine Ross, Richard Widmark, Bradford Dillman, Slim Pickens and Henry Fonda.
This is a long movie and the film itself drags a bit for me. Fans of action and disaster movies should check this film out on Netflix. It may be hit or miss as a DVD buy. I own the 2002 Warner Home Video DVD of The Swarm(1978)