Water under door thresholds.

[Bob Rowlands]

OK. Caulk is your friend in this application. I'd caulk every/all exterior and interior seams at the door. The lites, the door, the plates....all seams.

The drip edge sweep I mentioned is designed to shed water onto a slope away from the dwelling. That's why I suggested beveling the ext trim and the bottom plate below the door. Water will not pool it will move away from the yurt. You could likely fashion a BIG drip edge yourself with flashing if you did not want to do the beveling.