WeatherWebb

Making the weather more accessible

Rather dull, wet and windy

Today: Saturday 28th February 2015
Largely cloudy with early light rain and drizzle clearing, but another band of heavy rain will move into the west later. Increasingly windy.

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Tomorrow: Sunday 1st March 2015
A bright, but windy day with sunny spells and wintry showers, the showers most frequent in the west.

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The Next Few Day

Unsettled and windy again on Monday and Tuesday with wintry showers. Becoming drier on Wednesday with spells of sunshine expected.

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Sunshine and wintry showers

Today: Friday 27th February 2015
A chilly and breezy day with sunshine and wintry showers. However, cloud and rain will move into the west later.

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Tomorrow: Saturday 28th February 2015
A rather dull and windy day with spells of rain or drizzle.

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The Next Few Day

Windy with rain clearing eastwards on Sunday. Unsettled again on Monday with wintry showers. Wintry showers or longer spells of rain on Tuesday.

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The UK’s air masses

The UK’s weather is often a discussed, mainly because it is so changeable. In one day you can see sunshine, rain, snow, thunder and strong winds. The reason the British weather changes so much is for several reasons, such as; we’re an island, we’re often under the path of the jet stream, we’re affected by 6 different air masses.

For my diploma, I recently produced the map below to illustrate the different air masses that affect the UK and the different weather conditions they can bring. In general, the polar and arctic air masses are most frequent in the winter months and the tropical in the summer months. However, they can be seen at almost any point in the year. The most frequent air masses to influence the UK are the polar maritime and tropical maritime; we are frequently in a south-west to north-westerly flow.

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The maritime air masses are often very moist as they come from the seas and oceans and therefore collect moisture as they travel towards the UK. Continental air masses come from continental Europe and therefore are often drier in comparison to maritime air masses as they don’t have as much of an opportunity to collect moisture from the seas.

When it comes to winter, there are 3 main air masses that are associated with snow; the arctic maritime, polar maritime and polar continental. In 2012, I wrote an article on the “Perfect conditions for snow” for the MeteoGroup website WeatherCast. Below you can see the three maps I produced to illustrate what areas of the UK are likely to see the heaviest snow depending on which air mass is affecting the UK.

So how does an air mass change? When watching the weather on TV you will see or hear the forecaster discuss a front. Frontal systems are associated with low pressure systems, which develop, in general, to the north of the jet stream (as discussed in my previous blog; Pressure, highs and lows). Behind each front, there will be a different air mass; behind a cold front you may see a arctic maritime air mass or behind a warm front you may see a tropical maritime air mass. This leads to variations in the British weather, and it is often why it can start mild and wet in the morning, and then turn cold and dry in the afternoon. Additionally, high pressure systems can also influence the air mass that affects the UK. For example, if high pressure is situated over Germany, the winds travel in a clockwise direction, therefore warm air from France and Spain will move into the UK. This would be the tropical continental air mass.

Next time you’re looking at a synoptic map or weather forecast, see if you can determine which air mass is going to affect the UK in the coming days.

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Rain spreading east, followed by sunshine and showers

Today: Thursday 26th February 2015
Windy with rain moving eastwards, followed by colder conditions with sunshine and wintry showers.

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Tomorrow: Friday 27th February 2015
A chilly and breezy day with spells of sunshine, but also a few wintry showers. Cloud will thicken in the west later.

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The Next Few Day

Rain spreading east on Saturday. Windy with rain pushing eastwards on Sunday. Unsettled again on Monday with showers or longer spells of rain.

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Less windy. A fair amount of cloud with rain or drizzle at times

Today: Wednesday 25th February 2015
Early rain will clear to leave some sunny spells, but it will be generally cloudy with rain moving in to the west later. Less windy.

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Tomorrow: Thursday 26th February 2015
Rain will slowly move away south-eastwards, leaving sunny spells and wintry showers in the north. Increasingly windy.

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The Next Few Day

Sunshine and scattered showers on Friday. Rain spreading east on Saturday. Windy with rain pushing eastwards on Sunday.

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Windy with sunshine and wintry showers

Today: Tuesday 24th February 2015
A windy day with spells of sunshine and wintry showers. The showers most frequent in the west.

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Tomorrow: Wednesday 25th February 2015
Less windy. Early rain will clear to leave some bright spells, but another band of rain will move in from the west later.

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The Next Few Day

Rain clearing to sunny spells and showers on Thursday. Sunshine and scattered showers on Friday. Rain spreading east on Saturday.

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Windy with sunshine and wintry showers

Today: Monday 23rd February 2015
Sunny spells and wintry showers today, some of the showers may be locally heavy and thundery. Windy.

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Tomorrow: Tuesday 24th February 2015
Another windy day with sunshine and showers. The showers will be most frequent in the west and some may be heavy and wintry in nature.

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The Next Few Day

Increasingly cloudy on Wednesday with rain moving into the west. Rain clearing to sunny spells and showers on Thursday. Sunshine and scattered showers on Friday.

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Windy with heavy rain spreding eastwards

Today: Sunday 22nd February 2015
Increasingly windy today a band of heavy rain spreads eastwards, this falling as sleet or snow over high ground in the north.

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Tomorrow: Monday 23rd February 2015
A windy day with sunny spells and blustery showers. The showers will be most frequent in the west and some will be wintry and thundery in nature.

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The Next Few Day

Further wintry showers on Tuesday. Rather dull and damp on Wednesday, but some brightness in the afternoon. Rain clearing to sunny spells and showers on Thursday.

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Today is 4 years since WeatherWebb went live!

Today marks the 4 day anniversary of WeatherWebb.co.uk! It has changed a lot since I first set it up, but one thing remains the same, it’s all about the weather!!

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Sunny spells and scattered wintry showers

Today: Saturday 21st February 2015
Sunny spells and scattered wintry showers today, the showers will be most frequent in western areas. Chilly.

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Tomorrow: Sunday 22nd February 2015
A band of heavy rain will spread eastwards, this possibly falling as snow initially over high ground in the north. Increasingly windy.

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The Next Few Day

Sunshine and showers on Monday. Further wintry showers on Tuesday. Showers or longer spells of rain on Wednesday.

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