Spring is known for blocking patterns to set up and we have one set up now across the United States. It is called an “omega” block because it looks like the greek letter omega. Basically it looks like the number 8 laid on its side. You can see on the loop of the upper air map above that we have two upper lows. One is in the Ohio Valley and the other is in the Southwestern US. In between we have a ridge of high pressure in the Plains.
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