Very strong winds with gusts of 55-65 mph, perhaps reaching 75 mph in exposed places, are looking increasingly likely on Tuesday night into Wednesday morning.
Longer journey times by road, rail and air are likely, with restrictions on roads and bridges. There is also a chance of power cuts, and damage to trees and perhaps buildings.
Chief Forecaster's assessment
The strongest winds are expected to arrive in the west of the region later on Tuesday evening and move eastwards overnight.
There is some uncertainty in peak wind strengths and how quickly winds will ease on Wednesday morning.
Heavy rain will be an additional hazard, especially in the north of the warning area, resulting in especially difficult driving conditions.
This warning has been expanded in area and with the likelihood of "medium" impacts increased.