Last month, Storm Bert swept through the country, leaving at least four people dead and hundreds of homes flooded.

However, most of the country was only placed under a yellow warning - the Met Office's lowest warning level.

The Met Office has now been slammed for its confusing weather warnings ahead of the storm's arrival. 

Experts claim that the weather agency underplayed the danger, leaving many unprepared to face extremely fast winds and widespread flooding.

The weather agency has already faced strong criticism for not issuing a red warning in Wales where the effects of the storm were most severe.

But it has now been revealed that the Met Office was warned as early as April that the current warning system might not be effective.

The issue was raised at a meeting of the Public Weather Service Customer Group (PWSCG), an independent body which ensures weather services act on the public's behalf.

The meeting minutes show the Met Office had seen evidence suggesting people did not heed yellow weather warnings almost eight months before the deadly storm hit.

In the April meeting between the Met Office and the PWSCG, members presented evidence from a survey about yellow warnings carried out in Northern Ireland.

Stefan Laeger, a flood duty manager at the Environment Agency (EA), presented the information.

The meeting minutes say: 'SL [Stefan Laeger] noted the importance of the narrative both before and after an event and to consider that in a low likelihood, high impact event the perception might be that they think it will not happen.'

The Met Office's current three-tiered warning system was introduced in 2011 specifically to inform the public about the risks of extreme weather events.

The risk level reflects the likely impact of the weather event, meaning that the same storm would be given a lower warning in Scotland than it would in the South of England where people are less prepared.

The issue is that the warning level is calculated according to a 'matrix' which takes into account both how severe the impact could be and how likely those impacts are.

This means that extremely severe but quite unlikely outcomes can be given yellow or amber warnings even when they have the same destructive potential as a red warning event.

That becomes a massive problem because the public does not understand that a yellow warning can be just as dangerous as a red warning.

Hannah Cloke, a hydrologist at the University of Reading, told The Telegraph: 'There is an issue if people aren't understanding those warnings.

'If people are misinterpreting them to mean you don't need to take any action, then we have a serious problem.'

What these minutes show is that the Met Office was well aware that people don't think yellow warnings precede 'high impact' events before issuing a yellow warning for Storm Bert.

During the meeting, the Met Office also revealed that it was already conducting a review into yellow warnings 'looking at the action taken and the difference in how they are used by responders and the public'. 

When Storm Bert hit, the country was pummelled by 82mph winds, snow and a month's worth of rain, leaving at least five people dead in its wake.

More than 400 flood alerts or warnings were issued across Britain, including 206 alerts and 157 warnings in England; and 29 alerts and ten warnings in Wales.

Among the dead was Brian Perry, 75, a pensioner from South Wales who was reported missing after setting out to take his dog for a walk.

After the storm passed, Welsh politicians strongly criticised the Met Office for not issuing a red warning in areas where up to 300 properties were flooded.

Councillor Andrew Morgan, leader of Rhondda Cynon Taf county borough council, said he was 'amazed' that only a yellow weather warning had been issued.

A Met Office spokesperson told MailOnline: 'Storm Bert was well forecast, with first signs of disruptive weather signalled a week ahead and the first Severe Weather Warnings issued on Wednesday 20 November.

'Numerous Severe Weather Warnings were issued by the Met Office ahead of the system reaching the UK.'

Mr Morgan also says that residents were not given a flood warning as early as they could have been.

He claims that the environment body Natural Resources Wales (NRW) had data on high river levels for more than an hour before residents were alerted.

However, it is important to note that flood warnings are distinct to the severe weather warnings issued by the Met Office.  

A review is now being conducted into the decision-making process that led to the yellow warning being issued and how the Met Office worked with other agencies during the leadup.

Likewise, the Parliamentary Environmental Audit Committee (EAC) announced an inquiry into England's flood resilience.

Toby Perkins, Labour MP for Chesterfield and chair of the committee says: 'It is often the case that flood victims have had several false alerts before they are flooded and so the system of warnings will play an important part in the Environmental Audit Committee's inquiry.

'We need to better understand the accuracy of flood warnings and whether Government is capable of improving them.'

The Met Office spokesperson says: 'Our National Severe Weather Warning Service provides responders, emergency services and the public with a way to understand both the likelihood and severity of forecast impactful weather. 

'The service consistently achieves its accuracy targets and reaches huge numbers of people enabling them to prepare for severe weather.'