<human>: I have a fairly severe anxiety disorder. Driving, in particular, can make my anxiety really bad. However, recently my condition during driving has been improving.

Tonight, my friends are having a party. However, from the time the party starts, until tomorrow night, my whole area is having a Winter Storm Warning. Think freezing rain.

In the group I am the worry-wart. I am generally the "party pooper" because I always try to keep everyone safe. These are the typical party-animal college students, so I always keep an eye out for police, or any stupid ideas, to keep things from getting horrible. Several of the people in the group have made fun of me for this, and talked shit behind my back. I have declined several invitations to hang out with them over the past few months because they tend to do things that spike my anxiety (read: drink in public).

Yes, I know. "They are bad friends, ditch them." But my closest friend in the group, who I haven't seen for the better part of this year, really wants me to go. I have missed her a lot. This is only a house party, so my anxiety is not concerned with anything outside the weather.  So I really just want to go, see everyone, and have a good time, but I am seriously worried about the weather tonight. 

I am aware that my friends are not worth me dying. And that I probably shouldn't go due to the weather. How do I turn them down, politely, without losing my best friend in the group? She is probably fed up with me turning down invites to hang out.

Can you summarize the given text in a few sentences?
<bot>: got invited to a party tonight, but I have a severe weather warning in my area.  Should I go? If not, how do I turn them down without losing any friends?