12 km easy. PRIORITY session. Test first gel at km 8.
Best window
Best window: around 23:00. Why: wind stays manageable around 4 km/h, rain risk stays lower at about 2%. If you wait for that slot, still keep the run easy rather than trying to upgrade the day.
Execution
Start easier than feels necessary. Keep the whole run conversational, and take the gel at km 8.
Avoid
Do not turn the middle of this into a moderate effort day just because the legs feel decent.
Success today
Success today is 12 km done easy, foot quiet, gel tested, and no late-run grind.
Priority
Priority is still the long run.