What are weather warnings and how do they work?

For Monday and Tuesday of this week (February 16-17), the weather agency has said that snow and ice can be expected in northern Scotland, while an ice warning stretches along the east coast down from Edinburgh to Suffolk.

Additionally, all of Northern Ireland is subject to a yellow warning for ice. There are no further weather warnings, as yet, for later in the week.

But what are weather warnings, how do they work, and when are they put into operation?

What are Met Office weather warnings?

The Met Office states that its weather warnings are designed to let people know to prepare for extreme weather in store and has operated its existing colour-based system since 2011.

Forecasters take into consideration how weather patterns might be different or out of the norm for what is expected that time of year - meaning a lower severity of wind, for example, might constitute a warning in the summer and not the winter.

The Met Office issues weather warnings for:

• Rain,
• Thunderstorms,
• Wind,
• Snow,
• Lightning,
• Ice,
• Extreme heat, and,
• Fog

Weather warnings are different to named storms, which are a significant and individual weather event which is deemed worthy of having a name attached - with forecasters working through a pre-approved alphabet.

The Met Office states: “Weather warnings are designed to let people know there’s a potential for impacts in their location.

“This means that any warning we issue should make you think about what steps you can take to minimise the chances of disruption for you.”

What are the different levels of severity for weather warnings?

There are three tiers of weather warning.

3. Yellow: Potential disruption with a good degree of certainty

Yellow is the least severe and most commonly awarded tier of disruption related to weather.

When this is given, those affected should check their travel journeys and look at forecasts to consider their options and safety,.

“Even in a yellow warning area, people will see disruption to a greater or lesser extent, so it's important to check the details and see which steps you could take to prepare,” the Met Office said.

2. Amber: Likely widespread disruption

“Disruption from an Amber warning is more likely and more widespread,” the Met Office states.

“You should change plans that could be impacted by the weather and take action to protect yourself and your property.”

1. Red: High degree of certainty that there will be dangerous weather

It is uncommon for the Met Office to issue a red tier warning, with this being reserved for when there is a very likely chance of weather that could be dangerous or severe.

A recent example was Storm Eunice in 2022, which left thousands of homes without power and the O2 Arena left in tatters from high winds.

The Met Office states: “These warnings are reserved for very dangerous weather with a high level of certainty.

“You should take direct action to keep yourself and others safe from impacts of the weather. It’s likely there will be a risk to life, as well as substantial disruption to travel and infrastructure.”