Storm Alex – named by Météo France – will move across the Bay of Biscay towards the French coast later today before heading towards the islands tomorrow.
Jersey Met said that there was the potential for 75 to 100mm of rain between Friday and Sunday. The average for the whole of the month is 104.7mm.
And the shipping forecast is warning of winds of 'force seven to severe-gale nine, perhaps occasionally storm ten'. This forecast is for the shipping area around the islands and the winds on land are expected to hit gale-force eight to severe-gale-force nine.
As the storm brings low pressure to northern France and the Channel Islands, Jersey Met says warnings may also be issued as a series of high tides of between 10.6 and 10.8 metres occur between tonight and Sunday night.
Météo France forecast yesterday that coastal areas of southern Brittany and Loire Atlantique could experience winds of up to 140kmh (87mph) as the storm makes landfall late tonight, with other parts of Brittany and Normandy facing winds of 100 to 120kmh (62 to 75mph).