Most likely, if it's 'trade season' or the like, there could be a caravan that's scheduled to visit Bjorah's Cliff this week each year, say it's the first week of the month (summer or fall maybe?). It's been coming to town at that time every year for years and years, but now it's been a few days and they're not in town yet.
Last anyone heard (by the last courier or other horseman coming towards Bjorah's Cliff on other business, traveling faster than the goods-laden caravan), the caravan had left the last big town a few days ago (or weeks ago, as appropriate), on time as always. But hasn't been heard from since it set out from there.
And perhaps there's been talk lately of an orc tribe or bandit gang or whatever passing by a nearby village, causing some worry.
Irathias could be an old friend of Aramil, following him at the moment or seeing signs of trouble while exploring some of the nearby wilderness, then going to inform his friend, maybe. Hrm.