She is obsessed with bad weather, every time it is forcasted. She calls me all times of the day or night...sometimes it's okay. But, she proceeds to get mad if I won't stay home from work. She then tells me she is going to worry herself to death if I don't stay at home. Of course, I have no common sense, she implies. I can't just not show up to work. What do I do and what do I say? I'm at the end of my rope! I am cautious - she taught me that, when she was more reasonable. I am the first to take cover, believe me!
But reassuring mom with the facts may not do the trick, because this sounds a bit beyond rational concern. Is it a bit of control, too? A little guilt-tripping? Your behavior makes her worry herself to death so you should change your behavior? I don't know if that is involved or not. You probably have a sense of whether it is.
Poor Mom. It must not be fun to have an obsession like that, especially if you live in a region with dramatic weather. If you can think of ways to ease her mind, that would be a kindness. "I have to go to work, Mom. But I'll call you from the parking lot and let you know I got there safely."
If this is your mother's only annoying quirk, try to take it in stride. She could be obsessing on lots worse subject (like when are you going to give her grandchildren, or whether you are properly raising your children, or how much money you are saving for retirement). Fear of storms? Reassurance and changing the subject sound like good approaches to me.