No April Fools Joke, Here Comes the Temperature Plunge!

Just as the famous Yoshino cherry trees begin to blossom along the Tidal Basin, the North Atlantic Oscillation (NAO) is forecast to dive providing an ominous and reliable warning that a blocking pattern across the northern Atlantic Ocean is setting up as we head into early April.

The image above (courtesy NOAA) shows the NAO index plunging this week.  When the NAO is negative, high pressure builds over the north Atlantic Ocean causing the jet stream to dip into the eastern United States.  This dip in the jet stream typically initiates east coast storms followed by a blast of cold air.

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