Absolutely Fascinating Weather Pattern This Weekend (But Similar Blocking Has Happened Before………..1950 & 2007 Come to Mind for Eastern U.S.)May 3rd, 2013 at 3:54 pm by Chad Evans under Chad's WLFI Weather Blog
That Omega Block will make an very odd weather pattern set-up this weekend. It appears block will actually work WESTWARD & eventually that blocking upper low will pinch off & exit, leaving us in the warmth of next week with 70s & 80s!
With the Canadian Omega Block working west, it will actually PUSH UPPER LOW SOUTH, keeping a good chunk of the rain SOUTH OF THE VIEWING AREA THIS WEEKEND.
HOWEVER, I still would not rule out a few scattered showers/t’showers with best coverage of those in the southern part of the viewing area.
While all this is happening, incredible record cold will bring highs only in the 40s in parts of Arkansas, Alabama, Georgia & Tennessee, with 50s to the Florida Panhandle. Meanwhile, record hot, dry air in northeastern, eastern Canada & New England with create a very high fire danger. On the other side of the U.S., record heat & dry air will make for more wildfires, especially in California.
Similar thing happened in November of 1950 with incredible cold & snow in the Midwest, South & Appalachians with -3 Atlanta, Georgia & 60s in Massachusetts & Maine. Storm was blocked & historic snowfall (in feet) hit parts of the Appalachians with wind gusts over 80 mph in places.
Back in May of 2007, 90s occurred with Omega Block in Canada with 70s as far north as Greenland. Meanwhile, Mid-Atlantic & New England had historic floods & 40-45 degrees with winds gusting to 65 mph. Storm just sat & dumped rain with severe beach erosion & extreme flooding inland.
Back in the 1990s (in January I believe) a blocked upper low dumped up to 10″ of snow in central Mississippi, while it was in the 60s in Georgia & 50s up to Indiana.