Meteorologist Kim Castro explains what it is and why it's bringing several days of unsettled weather to Houston.

The sweeping pattern that's now influencing much of the USA's weather is called an omega block because of its resemblance to ...

The pattern, known as the "omega block," is named after the Greek letter omega and disrupts the usual zonal flow of weather ...

The blocking pattern is so named because its shape resembles the Greek letter omega. The unsettled weather will begin with a swath of heavy rain, flooding and potentially severe weather from the ...