Both of those options are pretty inconsiderate, both cancelling and trying to do extremely last minute appointments (unless the lady is fine with those). Call her early, with plenty of notice, and ask her if she's fine with the weather forecast and travelling in inclement weather for an outcall or, for incall, try to be near the general vicinity before the time so you're not going through traffic or driving too far in a storm. I would never advise you cancel a same day appointment, particularly since I personally only take same day outcalls which require a whole extra preparation than if I was just sitting in a hotel.  

Bottom line: If you know the weather is going to be bad, take precautions to make sure you get to your appointment or don't make one at all.

It doesn't stop me at all. She lives about 4 miles from me. In good Weather and Normal Traffic it takes me about 30 minutes to get to her incall location. She's so Happy to see me during Bad Weather because I'm the only one that shows up.

Tampa area.  Might drop down to highs in the 60's later next week.

We do sometimes have hurricane issues in the late summer and fall.

& she wasn't ready...  assumed I wasn't coming.  She'd made family plans so our session was rushed.

time, scale, terrain and vehicle

If you make it the appt, a good time may be had.