Large parts of Wales are being warned to expect heavy rain and high winds.
The Met Office says they could mean difficult travel conditions, as the summer holiday season starts for some. Standing water and spray may make journeys longer, and could lead to minor surface water flooding. Winds could be sufficiently strong to cause some bridge restrictions, and bring down branches from trees.
The Met Office says conditions could also be hazardous for those engaged in outdoor activities.
The Met Office says thunderstorms, with locally torrential downpours will continue to move north across Wales this morning.
Although the thunderstorms will tend to ease from the south later further, possibly severe storms may break out again this afternoon, probably focused over parts of northeast Wales.
Although some places will miss the thunderstorms, there is a chance of localised sudden flooding of homes, businesses and roads. Frequent lightning and large hail may be additional hazards, the latter bringing potential for disruption to power network
The Met Office says there could be 'tricky driving conditions' as heavy is forecast for parts of South Wales and Powys.
It has issued a 'be aware' warning with up to 40mm (over 1.5 inches) expected in places.
- Merthyr Tydfil
- Neath Port Talbot
- Rhondda Cynon Taff
- Vale of Glamorgan
Torrential rain and thundery showers are expected to bring an abrupt end to the sunny spell in parts of Wales.
With much of the country enjoying bright sunshine and the mercury hitting a high of 27C on Monday a yellow warning for rain has been issued by the Met Office for Tuesday.
It covers most of Wales except for the West and South East.
Forecasters say there's the risk of hail and localised flooding.
The Met Office says Porthmadog topped the UK's temperature chart yesterday at 26.4C (79.5F).
Gogerddan near Aberporth in Dyed wasn't far behind at 25.7C then Trawsgoed at 25.1C.
Valley on Anglesey reached 24.9C (76.8F).
The Met Office says there could be travel disruption this evening with snow predicted to sweep into north, mid and west Wales.
There's a yellow 'be aware' warning in force for:
- Isle of Anglesey
Forecasters say ice, snow and 70mph winds are set to blight the Wednesday morning commute as Storm Jake sweeps in.
The Met Office has issued yellow 'be aware' warnings for snow and ice for much of north Wales with up to 5cm expected in many places, rising to 10cm on higher ground.
There is a yellow warning of wind covering south Wales as squally weather arrives from 8am, bringing widespread inland gusts of up to 50mph and coastal gales of 70mph.
The A55 Britannia Bridge and the A477 Cleddau Bridge were closed to high-sided vehicles. There's a 20mph speed limit on the former. One lane's closed on the M48 Severn Bridge in both directions and there's a 40 mph speed limit.
The Met Office has issued a 'be aware' warning of icy conditions for North, Mid and West Wales.
It says we should be aware of the risk of some difficult driving conditions, and some low level travel disruption.
The warning applies to
- Isle of Anglesey
The Met Office says Sennybridge in Powys was the coldest at a chilly -5.8C.
In Bala, Gwynedd, the temperature fell to -5.3C and at Usk to -5C.
South Wales Police published the following advice when driving in icy and snowy conditions.
- It says you must be able to see, so clear all snow and ice from all your windows.
- You must ensure that lights are clean and number plates are clearly visible and legible
- Keep well back from the road user in front as stopping distances can be ten times greater than on dry roads
- Take care when overtaking vehicles spreading salt or other de-icer, particularly if you are riding a motorcycle or cycle
The Met Office has issued more 'be aware' warnings of rain and high winds for the whole of Wales.
It says a series of low pressure systems will bring mild and moist air to Wales along with strong winds.
This will lead to some large rainfall accumulations: 60 to 80 mm may fall fairly widely over the two days, and perhaps more than 120 mm over the highest ground.
Forecasters say Southwesterly winds will increase later on Monday morning, with gales extending eastwards across Wales .
Gusts of 50 mph are likely inland whilst gusts of 60 mph will affect some exposed coasts in the west and south.
There are 10 flood alerts in force.