HH waterproof rating?
Does this jacket have a HH (hydrostatic head) waterproof rating? Many running/trail events with a mandatory gear list specify a minimum HH rating for a jacket (and it is strictly enforced!)
Gore-Tex do not use Hydrostatic Head testing for their current fabrics, however you can usually assume that Gore products will feature an equivalent hydrostactic head in excess of 20,000 mm. It would be very unlikely for you to find an event where this jacket was likely to provide less protection that you require, however you might be best to check with the event organiser should you be in any doubt.