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?

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

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

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

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

Your current weather may be around awhile. The large-scale weather pattern that's now influencing much of the USA's weather – known as an omega block because of its resemblance to the Greek ...

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.