Thu 18 Sep: 09:00 BST
Thu 18 Sep : 08:00 BST(Currently Active)
Fri 19 Sep : 20:00 BST (14hrs remaining)
A slow-moving low pressure system centred just off north-western Iberia will draw up a warm and moist airmass across much of southern Britain during the next 24 hours with the east/south-easterly airflow becoming increasingly unstable from the southwest.
Scattered thunderstorms associated with a trough moving up from the south are now moving into parts of southwest England and these will continue to move further west/northwest in the next few hours before tending to die out. Scattered thundery showers may also affect southern parts of Ireland later this morning. These storms will bring some local downpours, perhaps bringing to a risk of flash flooding and hazardous travelling conditions.
Meanwhile that warm, unstable airmass will continue to move northwards across central and southern parts of England and Wales today, and as the sunshine breaks through lifting temperatures towards the mid-twenties, then a few scattered thunderstorms may break out this afternoon across central, southern and south-western England. Again localised heavy downpours may bring the risk of flash flooding and hazardous driving conditions.
On Thursday night an occluded front moving up from the south will bring a risk of further scattered heavy, thundery showers to southern and south-western counties of England and Wales with the risk this time extending as far east as Kent and this risk continues into Friday in these regions. Once more flash flooding and hazardous driving conditions the main risk from heavy downpours. As always with this type of set up not everywhere will see the storms and some places will miss them and stay dry.