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 letter omega – isn't budging right now.

If we have the May Omega Block worked out of the weather pattern, we should be almost summer-like by the end of May. I can’t predict the exact weather on each day of Memorial Day weekend, ...

An “omega block” weather pattern is forecast to set up across the country this weekend, possibly bringing some May snow. Here's what it will mean for you. The Weather Channel is forecasting a ...

For several days, the weather pattern over the U.S. will become blocked and slow. That means soaking, possibly flooding rain in the South and also where rain is needed in the Northeast.

A high-pressure pattern called the “Omega Block” will keep dry conditions in Portland through Wednesday of next week, but wetter conditions are expected to arrive by the first weekend o… ...