Issued: 1000hrs Friday 20th July 2018
Duty forecaster: Garry Nicholson
Thunderstorm risk by end of week
Southern regions will be hot and humid most of the week ahead, whilst northern regions will be cooler for a few days with a little rain. It is likely to be the hottest spell of the year, with the mid-30s Celsius possible in the south-east. However, the humidity is eventually likely to break into thunderstorms.
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Southern and central parts of Britain will be dry with a good amount of sunshine, although western areas will tend to be cloudier. Fronts draped across Scotland and Northern Ireland result in mostly cloudy skies here, with outbreaks of rain or drizzle at times, focused over western hills. A southwesterly breeze, strongest in the north and west. Just 17 to 20C in the far north-west, but much hotter in the Midlands and south, 28 to 31C.
Weakening fronts are expected to influence the north and west, bringing cloudy skies and a little rain or a few local showery bursts. Dry, mostly sunny and very warm for much of central & south-eastern Britain. A light west to southwesterly breeze. Feeling humid in the south. Temperatures ranging from 16 to 21C in the north & west, up to 28 to 31C in the south-east.
High pressure resides across England & Wales, maintaining hot and dry weather here. Fronts continue to influence the north & west, bringing a risk of some rain for Ireland and western parts of Scotland, although detail very uncertain. A similar spread of temperatures from north-west to south-east, 19 to 30C.
High pressure drifts to the east, drawing in a southerly airflow. Temperature and humidity rising for all. Chance of local thundery rain, but many places should be dry with sunshine. 22 to 25C for northern regions, but the south topping 30C.
Very hot and humid with a southerly airflow. A risk of local thunderstorms, most likely toward the west & south-west. Highs 25 to 33C, hottest in the south-east.
Detail and timing very uncertain, but the heat is likely to break into thunderstorms heading into the weekend. Still hot and humid, 24 to 31C.