The category 1 storm was formed last night and was 475 kilometers north of the northwest of Broome at 8 pm (10 pm AEDT).
The Meteorology Office expects the system to continue running almost west before making a U -turn and strengthen category 3 on Thursday morning.
It is too early for any land prediction, but the outer winds could be affecting approximately 400 kilometers of coast, from northern Broome to a little north of Kuri Bay, Friday night.
Although it is forecast that the storm will weaken again, return to a category 1 storm at that time.
“The tropical cyclone Errol is fine north of Broome and moves west,” said the office last night.
“It is expected to continue moving west and intensifying during Wednesday.
“As of Thursday, Errol is expected to turn southeast to the coast and weaken.”
