Synoptic chart - what does trough line with barbs mean

[tudorsailor]

Just to expose my ignorance, what does this mean on the Met Office chart?

Thanks

TS

 

[Driftingby]

Had no idea, so went to look it up - from Met Office

 

[STOL71]

To me, it looks like an iron curtain being lowered between the UK and Europe.

 

[alan_d]

So it's a convergence line. What's that?

 

[WoodyP]

So it's a convergence line. What's that?

Convergence lines

 

[KompetentKrew]

In case anyone else is interested in how the convergence fits into the larger picture:

 

[boomerangben]

I thought it a forecast of seaweed on the surface

 

[tudorsailor]

Thanks for pointing me in the right direction
factsheet_11-interpreting-weather-charts.pdf (metoffice.gov.uk)

TS

 

[Sandy]

I thought it a forecast of seaweed on the surface

You need to build a proper weather station.

Small rock on a bit of string with wind scale drawn on a board.

Glass jar containing seaweed to indicate how wet it is.

 

[Bodach na mara]

Used to be called an occluded front back around 1960

 

[Buck Turgidson]

Used to be called an occluded front back around 1960

nope. plenty of occluded fronts on the same chart.

 

[boomerangben]

You need to build a proper weather station.

Small rock on a bit of string with wind scale drawn on a board.

Glass jar containing seaweed to indicate how wet it is.

?
Living in the outer Hebrides, there’s no need for stone on string - it needs a chain, besides it would always be horizontal and wet. If it’s really windy, the sea weed is in the garden

 

[capnsensible]

?
Living in the outer Hebrides, there’s no need for stone on string - it needs a chain, besides it would always be horizontal and wet. If it’s really windy, the sea weed is in the garden

And if you can't see the stone it's foggy.

 

[ronsurf]

A convergence is when two air masses are forced together, forcing the air upwards. This typically results in very heavy localised rain.

An example is the Boscastle event. Air flow over the land slows and is deviated towards the centre of the depression. This then meets the air over the sea which has not deviated. The two meet and have nowhere to go but upwards, creating cloud and often heavy rain.

This is different to an occluded front where one air mass is pushed under a different air mass. A convergence is more local and occurs within the same air mass.

 

[tudorsailor]

Never noticed before reading up in anticipation of online YM course. And there is the convergence line on todays chart again!

Every day a school day

TS