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heat wave is smothering a us humidity, driving the heat index into the triple digits. >> and this could be just the beginning of a brutally hot summer for americans and a new study suggesting the looming threat of an earthquake and tsunami. and the northwestern us of a size rarely seen on this planet and science contests are warning no one is ready. >> okay, we're following these major developing stories and many more all coming in right here to cnn news central right now, speaker mike johnson is meeting with former president trump at mar-a-lago. >> the two liters said to be working ...

And yes that same wave pattern is what made it almost summertime in sochi. why is it all so slow moving this year holding those severe weather patterns over us longer? >> nast an area of research that we're currently investigating. we don't have a clear cut answer to that question. and if we did, we would have a much more skillful prediction in the longer time scale, say, out to 1 to 2 months. >> reporter: another mystery? whether this is all connected to climate change or not. they're still trying to crack that code trying to find out if climate change impacts those jet stream patterns and ou...

Coast-to-coast, impacting tens of millions of people. what's the science behind all of the extreme weather? >> in terms of the storms we've seen in october, november, december, as i often tell peo e people, you know, the atmosphere doesn't have an on-off switch that knows when winter begins. >> dr. marshall shepherd is a president of the meteorological society. he said there's one big reason for the wild weather, the jet team. >> when we have the el nino-neutral conditions, the jet stream patterns, we get the strong dips in the jet stream patterns, and in the dips, cold air, and in the hills, ...

>> reporter: he's the president of the meet logical society. he says there's one reason for the wild weather, the jet stream. >> the jet stream patterns, we get strong dips in the jet stream patterns. in the dips, there could be cold air. in the hills, warm air. so, generally, the jet stream pattern is the governing forcing function of our weather in the wintertime. >> reporter: case and point, denver, colorado. in ten days they went from negative temperatures to a balmy 70 degrees. a time of year when it should be hovering around 40. we are talking about 30 degrees above normal. in the big "d...

Oscillation which is affecting our winter right now. >> i know you described it, weather as a mood and climate as a personality. what do you mean by that? >> weather is your mood and climate is your personality. you can't say anything based on what is happening today no more than you can say on my personality based on my mood today. the at amous fear, not a magic flip that has been flipped to say, okay, we need spring weather. this jet stream patterns that we're under because of this arctic is affecting our weather and keeping us really cold in the eastern part of the united states, it's reall...