Computer models keep suggesting the development of an “omega block” across western Canada by late this week. Such a block can involve a splitting of the overall upper level wind flow by a closed high to the north and a closed low to its south (Fig. 1). Alternatively, the pattern
Read DetailsMarch has been a mostly mild month across much of the U.S. That’s because upper-level and lower-level winds have been blowing primarily from the west, southwest or south across the Nation. Yes, there have been occasional bursts of chillier air, and these come on the heels of winds from northwest,
Read DetailsIf you watched many TV weathercasters report during the first week of January 2014, you heard explanations about how the polar vortex, and its associated pool of bitterly cold arctic air, controlled the weather across the eastern two-thirds of North America (Fig. 1). The counter-clockwise circulation…To read the entire feature,
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