Today's GFS valid for late Thursday night shows a massive Omega blocking pattern, with a cutoff low in the SW US and the Eastern US, with a ridge in between (NEXLAB).

Premium: Omega block returns, with different results

An anomalous blocking pattern has returned for the second time this Spring, but the sensible weather results will be quite different this time around. Instead of falling underneath a large blocking ridge of high pressure, as we did in early April, this blocking pattern has brought (and will continue to bring) persistent troughiness and unsettled weather to our area, as well as below normal temperatures.

The blocking pattern responsible for the troughiness is quite impressive. Higher than normal height anomalies are present throughout much of the Arctic, including Northern Canada and much of the Northwest Atlantic. This blocking is something that seemingly hid itself during the winter months — which some are certainly thankful for, as its presence would lead to extreme cold and snow. Unfortunately, this time of year, it has resulted in clouds, showers, and temperatures in the 50s for this entire week.

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