Not unheard of
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Rare phenomena, but not unheard of...
The jet stream is lower than usual in it's North American track at the moment. This can be attributed to a weak 'La Nina' effect which has cooled the west central Pacific waters. This usually results in a dip in the jet stream and unusually warm temperatures in the central and southern regions of the US, but colder than normal temperatures in the northern regions of the US and southern Canada. This temperature variance boundary between the unusually warm and the unusually cool areas has seen the effects of warm verses cold air-mass collisions and the resulting severe weather. NOAA has predicted a continuation of this effect in the northern hemisphere until well into springtime and possibly beyond.
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