Winds gusting up to 75mph (120km/h) are expected to hit Jersey at the weekend as Storm Darragh sweeps in.
Jersey Met said winds were to increase on Friday evening and through Saturday and will most likely be at their strongest on Saturday afternoon.
Boat owners have been warned by Guernsey Harbours to secure their vessels by double checking covers and hatches, ensuring mooring lines are correctly rigged and bilge pumps tested.
It was expected there would be an increased risk of falling trees and debris on the roads and people in Jersey were being urged to only travel if necessary.
People were also being asked to keep away from coastal areas to avoid risk of harm and not to put themselves in any unnecessary danger.
An amber severe weather warning has been issued by the Met Office in the UK for strong winds in Northern Ireland, south-west Scotland and western areas of England, down to Cornwall and Wales, from 15:00 to 21:00 GMT on Saturday.
Gusts will be about 70-80mph (113-129km/h), especially around coastal areas. Further inland, gusts were forecast to be 60-70mph (96-113km/h).
Aurigny offers flexibility
Aurigny warned customers booked on flights on Saturday and Sunday of the potential for disruption.
It offered a free change, which would let passengers move to an alternative flight within seven days of the original scheduled departure, or the opportunity to travel earlier on Friday.
Chief commercial officer Sudeep Ghai said: "We hope the extra flexibility offered will provide some reassurance and a little extra certainty to our communities at this time."
The fourth named storm of the season, Darragh comes only weeks after Storm Bert and Storm Conall caused disruption at the end of last month.
While heavy rain was expected, there was unlikely to be as much rainfall and flooding as seen with Storm Bert, forecasters said.
To report routes blocked by fallen trees in Jersey, people were urged to contact Infrastructure and Environment Operations and Transport on 01534 445509 for main routes, and the duty centenier for parish roads.
