Summer is in full swing, bringing sizzling days, hot temperatures and high humidity…or is it? For many on the East Coast and in the Midwest, the summer swelter will be put on pause as an unusually cold front sweeps through parts of the country.
However, a repeat of the ‘polar vortex’ is not to blame. This past winter’s cold weather, dubbed the “polar vortex” by mainstream media, was a common pattern of cold air being pulled southward from the North Pole. The cold temperatures we are experiencing are not comprised of cold enough air to be considered Arctic.
This July’s sudden change in temperatures is actually caused in part by a dip in the jet stream. The jet stream rising and falling is a normal pattern, for September and October especially. However, seeing the jet stream dip so far south in July is uncommon. The result is that cool, dry air is diving into the Upper Midwest, and will spread across the eastern and northeastern U.S. for the next few days.
While temperatures dip into the 50s and even 40s at night in parts of the Midwest, thermometers will stay high on the West Coast as typical summer weather continues. There is up to a 90 percent chance that summer temperatures will be above average in parts of the West Coast.
A few areas along the Pacific Coast will experience record highs, and the larger area will be slightly warmer than usual. Summer thunderstorms are possible, and could lead to flash flooding, lightning and maybe dust storms. Lightning has already triggered wildfires in parts of Oregon and Washington this week.
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The WeatherBug – Earth Networks Team