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.

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 of February.

Discover how Ohio's omega block impacts weather with slow-moving low pressure, rain, and cooler temperatures until the pattern breaks through next week. Skip Navigation. Share on Facebook; ...

A weather pattern known as an omega block will dominate the United States this week, bringing wet, cool weather to parts of the East and West and mild, dry conditions in between. Here's how it works.