Colder weather forecast later this week into next week could bring another cycle of ice-up, and with it “unpredictable rapid fluctuations” and high water, the weather service said.

Darkhouse spearfishing is legal from ice-up through March 15.

The beginning of the darkhouse spearfishing season changes from December 1 to whenever ice-up occurs.

Although he stressed it was only speculation, he said it was possible the pilots may have lost data on air speed because of an ice-up of pitot tube instrumentation.