UK: Severe weather warning forecast for most of England and Wales, Sept. 22-23

Severe weather is forecast across much of England and Wales Sept. 22-23. Rainfall on Sept. 22 is expected to increase through Sept. 23, with heavy rainfall first forecast in central and southern England before moving northeastward in the following hours. Cumulative totals of between 6-8 cm (2.5-3 inches) and 10-12 cm (4-5 inches) of rainfall are forecast, with the possibility of lightning. Heavy downpours may cause flooding and associated disruptions in affected areas.

As of Sept. 22, the UK Met Office has issued the following weather warnings across the country:

• Amber heavy rainfall warnings (the middle level on a three-tier scale): Parts of northeast and central England on Sept. 23.

• Yellow heavy rainfall warnings: Most of eastern, central, and southern England, as well as eastern Wales, Sept. 22-23

Officials could update and possibly extend the coverage of weather alerts over the coming hours and days.

Heavy rainfall could trigger 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.

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.