NewsHow long will this pattern last??
Posted At: March 25, 2008 @ 9:47 AM
Posted By: Reed Timmer
Related Categories: General
Glancing at last night's GFS, it looks like the strong zonal flow across the northern U.S. will continue through late March, with the hint of a pattern change around the first of next month. There will be a sheared-out shortwave that will move through the zonal flow by 72 hours, but moisture will be limited and the LLJ will be way too veered for any substantial tornado threat with this system. By ~168-180 hours, recent GFS runs have been hinting at the development of a more substantial western U.S. trough as the zonal flow breaks down into higher amplitude Rossby Waves. As is often the case with La Nina years, I wouldn't be surprised if we have a late start to the Great Plains severe weather season...which is better than never.
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