Ethereal portals are presently marching directly towards town from the beach.

It's 4:56pm on Sombdi, day 8 of Spring, 548. This looks bad.

Update: the portals traveled northeast, leaving a trench in the beach. They stacked together in the corner of the west wall. Many exiles entered them, fell, and departed. Eventually these portals slowly vanished, one by one. All is clear now, and all that remains is the trench behind.