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The latest near-term outlook shows the progression of cold polar air over the next two weeks in which a concentrated vortex surrounded by a high-pressure system begins to stretch around Feb. 15. Five days later, the model shows the system splitting and changing its trajectory to send colder air down to the northern U.S.
To illustrate her point, Merwin brought up the National Oceanic and Atmospheric Administration's seasonal forecast, which she said might be misleading in calling for slightly"This is an average for the entire month— every single day in February, we'll add up the temperatures and divide it by the amount of days," she explains.
Source: Healthcare Press (healthcarepress.net)