I am not worried so much about rain but about the 21 mph winds that are in the forecast for 5 PM. Of course, I am sure that Mark has designed this route with a full tail wind in all directions maybe we will pull that 16 average we have been looking for.
Don't be skairt of the wind. I rode 7 straight days in Texas last month and we maybe had 1 day when the wind was below 20mph. Just set your sights on getting through the first part with the headwind, and then enjoy the return!