If you're reading this, you're probably experiencing extreme weather (sigh). The first port of call should be to check just how severe the weather is. The Met Office work on a three-tier warning system that ranks extreme weather in terms of how dangerous it is, ranging from yellow, amber and red.
Yellow weather warning
Yellow serves as a warning, many people will be able to carry on as usual, but some will be affected. Examples of this include strong winds and rain. Travel delays may occur, and motorists should plan ahead before leaving the house.
Amber weather warning
Amber means that there is a potential risk to life and people should be prepared to change their plans to keep themselves safe. Some roads will be closed, and power cuts are expected. You can still drive in an amber warning, but you shouldn't travel unless it's essential. Examples include moderate snowfall, storms, and gales.
Red weather warning
A Red warning means extremely bad weather and a risk to life is likely. Examples include heavy snowfall, extreme storms, and abnormally cold temperatures. People in the area should take appropriate action to protect themselves and their families. You should NOT in any circumstances leave the house for a drive.
You can find the Met Office weather warnings on their website. If you're using a smartphone to check the weather, each weather app will have its own warning system similar to the Met Office.
You can also look on the National Highways website and regional Twitter accounts for live travel updates, including a handy interactive map where you can scroll and zoom in on your given location.