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Originally posted by RUDDD
Until a F4/F5 Tornado ploughs through Central London I wouldn't consider this anymore than a heightened season thanks in-part to a cooler Atlantic and active LaNina season in the Pacific co-incidentally peaking during the mid-spring season what were seeing now. We see the usual sporadic weather patterns then blame it on HAARP, Global Warming, Aliens, whatever crap, until he records prove its nothing more than a LaNina, ElNino, SSW event. Infact LaNina is still in a cycle even now thanks in part to a active solar output were seeing.
Nothing out the ordinary, just a active than normal season.
Originally posted by reesie45
And im wondering why there are tornadoes being reported in New England and in NJ. Its not normal, something is going on, and your an idiot with no sense if you deny that.
Zurn-Birkhimer compared tornado activity during El Nino and La Nina events by calculating a ratio of tornadoes on a state-by-state basis. Her findings show more tornadoes in the central and southern plains and the Gulf Coast during strong El Nino years, with a shift to more tornadoes in the lower Midwest, the Ohio and Tennessee valleys, and the mid-Atlantic region during La Nina years.
"During an El Nino event, the polar jet stream -- which carries cold, dry air from the north -- shifts south, bringing cooler air to the Midwest and Southeastern regions of the country," she says. "This cooling effect might also serve to suppress tornado activity in those areas." By contrast, during a La Nina event, the subtropical jet -- the jet stream that brings warm moist air from the south -- shifts to the far north, bringing an influx of warmth and moisture to these regions, and increasing the odds for tornadoes, Zurn-Birkhimer says.
The biggest recorded outbreak prior to Wednesday was on April 3, 1974 — 148 twisters touched down in 13 states, killing 310 people and injuring nearly 5,500. It, too, happened during a La Nina, adding weight to that argument.
Interestingly, she adds, the years with neither an El Nino or La Nina event tend to favor a below-average number of tornadoes by more than 2-to-1.
The unusually large number of severe tornadoes this year may be a sign of large scale changes in the jet stream.
John Harrington Jr., a professor of geography at Kansas State University, notes that severe tornadoes are not unheard of historically. But when the events happen frequently such as the the destruction of Joplin, Mo., the outbreak of multiple tornadoes in Alabama, and yesterday's northeast outbreak in Massachusetts, it becomes a warning that there are changes afoot in the jet stream.