Here's the EPS....you can see how the longwave pattern is pretty decent synoptically for a threat....you obviously need the details to work out, but the larger pieces are there..... You have your -NAO forcing the PV lobe under it into 50/50 low position while you have the main trough axis still back in the center of the CONUS and a nice PNA ridge to help amplify anything diving into that trough. Still a long shot but it's at least a compelling setup.    
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