UK: Thunderstorms forecast across multiple regions through at least June 13

Event

Thunderstorms are forecast across parts of the United Kingdom through at least June 13. As of June 12, the UK Met Office has issued amber thunderstorm warnings (the middle level on a three-tier scale) across parts of central England; strong winds gusting up to 72 kph (45 mph) and hourly rainfall totals of around 6 cm (2.4 inches) are possible in the amber warnings area. Yellow thunderstorm warnings have also been issued for parts of central and northwestern England, much of Wales, western Northern Ireland, and northern and western Scotland. Further yellow thunderstorm warnings have been issued for parts of western Northern Ireland and western Scotland June 13. Storms may be accompanied by heavy downpours, strong winds, lightning, and possible hail. Heavy rainfall could trigger flooding in affected areas and strong winds could cause power outages and property damage.

The adverse weather will likely contribute to transport disruptions in affected areas due to slippery roads, reduced visibility, and strong winds. Dozens of flights have been canceled at London Gatwick (LGW) and London Heathrow (LHR) airports June 12-13 and further cancelations and delays are possible in the coming hours. Lingering disruptions are possible even once weather conditions improve as aviation authorities work to clear the backlog caused by previous delays and cancelations.

Hazardous Conditions
Heavy rainfall could trigger further flooding in low-lying communities near rivers, streams, and creeks. Urban flooding is also possible in developed areas with easily overwhelmed stormwater drainage systems. Landslides are possible in hilly or mountainous areas, especially where heavy rainfall has saturated the soil.

Authorities could issue mandatory evacuation orders for flood-prone communities over the coming days. Disruptions to electricity and telecommunications services are possible where significant flooding or landslides impact utility networks.

Transport
The severe weather will likely contribute to transport disruptions throughout the region. Traffic and commercial trucking delays might occur along regional highways. Flooding downpours could inundate some low-lying roads in areas with poor drainage. Strong winds might also pose a hazard to high-profile vehicles. Hazardous weather conditions might cause flight delays and cancellations at airports across the affected area.

Disruptions triggered by inclement weather and resultant hazards, such as flooding, could persist well after conditions have improved - it could take days before floodwaters recede and/or officials clear debris. If there is severe damage to infrastructure, repair or reconstruction efforts may result in residual disruptions.

Advice

Monitor local media for weather updates and related advisories. Confirm all transport reservations and business appointments before travel. Make allowances for localized travel delays and potential supply chain disruptions where flooding has been forecast. Do not drive on flooded roads. Charge battery-powered devices in the case of prolonged electricity outages.

Resources

Met Office UK
Scottish Environment and Protection Agency Flood Updates
Environment Agency England Flood Alerts
Natural Resources Wales Flood Warnings