A strange atmospheric pattern known as an "omega block" is preventing the usual eastward progression of weather across the U.S. — but what is this weird block, and when will it go away?

A weather pattern called an 'Omega block' is going to bring a prolonged period of sunshine and dry weather say weather ...

It’s about to rain for days in eastern states because of an unusual atmospheric phenomenon known as an omega block.

However, it's not all bad news, as weather experts predict that the record-breaking sunshine could continue for most of the ...

"Huge uncertainty" surrounds the forecast for the June Bank Holiday weekend, but there are promising signs for the weather a ...

The summer has gone on a short break in Ireland as unsettled weather took over this weekend but there are signs that high ...

The great weather we're currently enjoying is down to a a blocking area of high pressure sitting just to the north of Ireland ...

More than half of all the stations have had their highest ever mean maximum temperatures for spring and the majority of all ...

It is defined by a powerful high pressure area with an area of low pressure "underneath" or south of the high pressure.

Warm weather set to give way to more unsettled conditions - but forecasters predict warm summer ahead in Ireland ...

An Omega block with stabilize conditions in Calgary. Jodi Hughes has a look at the five-day forecast from the Sky Watch Weather Centre.