Get ready for everything to stop moving in the atmosphere for a while. High pressure both at the surface and aloft has begun building over Greenland and before this is all done, it will bring the atmospheric flow that normally goes from west to east to a grinding halt. The saying high over low means everything moves slow will certainly hold up here. In fact it may not move at all for a few days next week!
The upper air jet stream pattern is a sea of extremes. We have a very strong blocking high in Greenland pressing southwestward. A deep (intense) upper low in the Tennessee Valley, a strong ridge in the west, and a ridge in the Atlantic along 60 degrees west. In the short term it means rain for Friday on the order of a couple of inches as low pressure moves northward along the Appalachians. That's the easy part. Its what happens afterwards that makes things difficult because it will keep us in very unsettled weather conditions right through the weekend and possibly through a large portion of next week....READ MORE AT http://www.meteorologistjoecioffi.com/index.php/2017/05/02/weather-models-blocked-long-range/