Weekend in question

I ran laps at the track today and was disappointed that the hamstring hurt while running.  I am suppose to run a 5K trail run in Willis tomorrow morning, but there is a 95% chance of heavy thunderstorms at race time and for the next 2 or 3 hours.  They will decide whether to cancel it at 6:30 tomorrow morning.  Then, I have the 10-mile Texas 10 Series in Katy Sunday morning.  Now, I am wondering about the hamstring holding up for that distance.